Archive of Our Own

Leo has daddy issues. They’ve been a pretty blatant part of his whole thing since he was a kid. This is something he’s come to accept about himself.

He doesn’t realize the extent of these ‘issues’ until he walks in on Donnie reprimanding Shelldon. The softshell was standing tall, firmly scolding the bot for something or another. His shoulders were back, and though he wasn’t outright yelling he had his arms crossed and his jaw clenched and-

And- look. There should have been nothing sexy about Donnie being so…authoritative.

But.

Leo just- he never really thought of Donnie in that light before! Sure, 

he kindaaa knew Shelldon was technically Donnie’s kid, but Donnie is Leo’s age! And his twin bro! So he’s not a “daddy” type, right? He shouldn’t set off any of Leo’s wayward daddy issues, right?

…right?

Well, according to Leo’s very, very wet dreams, the answer to that question is “no” actually, Leo’s daddy issues were set off hard.

He wakes up in the middle of the night five days in a row, stuffing his fingers into his slick slit in a poor attempt to copy his dreams. It’s never, ever enough, and all it does is make him make him desperate and unable to go back to sleep.

His dreams follow him when he wakes up too, making him still hear the snap of a belt (they didn’t even wear those kinds of belts?!!), still hear the reprimands when he fucks up (which do not sound that sexy in real life) and the soft tones when he does well (he barely ever gets those, so he has no idea where his brain was pulling that from).

And even during the day, he’s had to stop himself multiple times now from answering Donnie with a “Yes, Daddy.”

He’s pretty sure he can cover it up if he does say it, though. ‘Daddy’ sounds close enough to ‘Donnie’, right? And Leo’s called Raph ‘Daddy’ as well, so maybe it wouldn’t even register? He’s gotten his brothers off his shell from way worse that that! Surely if he slips up he can save himself, yeah?

…Whatever! It doesn’t matter. This’ll pass just like all his little ‘daddy issue’ crushes do. He just needs to wait it out until he remembers that Daddy is his twin…

…Donnie, he means. That Donnie is his twin. Not Daddy. Because Donnie is not a Daddy. Nope. Definitely not.

“Thinking of someone special?” The cashier asks as they check Leo out.

“Mind your own business.” Leo responds, shoving his brand new purple dildo deep into his nondescript bag.

He does not have a problem, he’s just in a phase, okay? It’ll pass!

It will!

Spoiler alert: it did not pass.

In fact, it got worse. Characteristics of Donnie’s that used to just be endearing mad scientist traits were now, dare he say it, hot????

Donnie and his stupid sharpie eyebrows should not be hot, but Leo burns at his glares.

The dildo also doesn’t fucking help at all, go figure. All it did was make him want the real thing! All he thinks as he brutalizes his own slit is how he knows Donnie could fuck him so much better than he ever could himself.

HOW WOULD HE EVEN KNOW THAT?

Leo’s a little ashamed to admit it, but he did go off on his own a lot after months of ‘Daddy Donnie’ torment with the express purpose of finding someone else to hit that chord in him. Any kind of man with authority could’ve done it for him, so obviously he just needed a good replacement.

And he found a lot of Daddies alright! All of which he left on read within the first hour of interacting with them.

Not a single person got to him the way Donnie did, and Donnie wasn’t even trying. What the fuck would Leo even tell him? “Hey Donnie, guess what? Me, your twin, your brother, finds you to be total Daddy material! By the way mind railing me into next week ‘kay thanks-“

This desperation was getting to him, and he was more than a little exhausted from the lack of sleep too. Leo just needed to pull out all the stops and find a way to nip this in the bud.

He’s not proud of what he does next.

“What was future Donnie like?”

Casey Jr. side-eyes him.

Listen. He had to know. If he knows what Donnie was like in actual Daddy age years, then maybe he’d be disillusioned and maybe his pussy would dry the fuck up for once!

“Why do you wanna know?” Junior asks, clearly wary, which, rude. Leo could’ve just had innocent intentions here!

He doesn’t, but like, he could've!

Leo shuffles a bit. “I’m just curious! You said he’s super smart, but that’s no different than now, yeah?”

Junior continues to look at him in that judgmental ‘see right to the center of Leo’s fucking soul’ sort of way, even as he eventually answers, “He was smart, obviously. Strong. Taciturn sometimes and dramatic others, I guess.”

“So, he didn’t change at all.” Leo sighs.

He gets a weird look at that, which Leo thinks is entirely unwarranted. It’s true, after all!

Junior continues, “He was also, um. More bloodthirsty than now? Some people in the resistance said he had “supervillain potential” or something. And…he was tall.” He pauses, looking right at Leo. “Taller than you.”

…Fuck.

See, as they’ve grown (and grow they did, poor April was left in the dust as three out of four brothers make it to six feet - seven and a half for Raph) he and Donnie have been relatively even when it comes to height, with he himself usually barely winning out.

And Leo doesn’t mind the thought of being the taller one. It’s even sexy to get dicked down by someone shorter than he is if he’s being honest!

But…imagining Donnie tilting his head to look down on him, putting his knee between Leo’s thighs and making the slider have to go on the tips of his toes or else ride his leg…

Yeah, fine, okay, Donnie is officially a capital D Daddy in Leo’s mind and this new information did not help. Hearing that older Donnie is more bloodthirsty as well was another unexpected bonus according to Leo’s ever growing list of fucked up kinks!

What if Donnie’s a Dom as well, huh?! Leo’s fucked.

Or, wait, no. Leo’s not fucked. And that’s the problem. He’s not and will not be fucked and that’s not gonna change any time soon. His pussy is gonna remain wet and aching with nothing to satiate it but his own fingers and a purple dildo not so lovingly dubbed ‘Dildotello’.

But it’s okay, he’ll deal with it. He can push away a libido just like he’s pushed away the want to kiss Donnie all these years. Just like he’s fought off the desire to be wrapped in each other’s arms. Just like how he’s stopped himself from looking too long whenever Donnie has a rare soft smile on his infuriatingly handsome face-

…Okay, maybe he’s got some other things going on than just the daddy issues.

But those things were easier to ignore! It’s easier to ignore messy shit like ‘feelings’ when your family is already so close. No kisses, but hey, proximity is a hell of a balm.

…Leo’s lying to himself. It hurts more than it should.

He slaps himself in the face, startling Junior. Oh, yeah. Leo forgot about him as he was delving into his happy fun twincest fantasies.

“Uh…are you…okay, Leo?” Junior asks, concerned.

“Yeah, never better, why?” Leo replies, blood now dripping from his chin.

It takes a bit to shake off Junior’s perceptiveness, but Leo’s a goddamn master at that by now. To Leo’s further credit, he manages to keep it cool afterward as well. Even on their latest patrol where Donnie was being so fucking hot and capable the entire time.

So it’s totally not his fault when-

“Watch out, Leo- the big one is heading your way!”

“Yes, Daddy~”

The sudden sounds of sputtering and explosions firing off fills the comms and it takes Leo a second to realize what just happened.

“What did you just say?!” Donnie demands, voice pitched in his shock.

Okay. Okay! Leo’s prepared for this!

“Uh, I said “Yes, Donnie”?” Leo replies, as ignorantly as he could. “Why? What’d you hear?”

“You- I- what-“

“Uh, would you two knock it off? We got a fight to deal with here!” Raph’s voice snaps over the comms.

Leo grins, the relief of covering his fuck up immense, “Gotcha, Big Daddy!”

It’s radio silence from Donnie after that, but the four of them easily beat the bad guys of the day. They even go to get pizza afterward! They did good, great even.

Leo ignores Donnie’s burning gaze.

He ignores it so well, that they get all the way home, he gets all the way to his room, and he’s just about to have some quality time with Dildotello when a hand stops his doors from closing.

“Nardo.” Donnie’s voice is clipped. Steely.

Authoritative.

Aw, fuck.

Leo smiles nonchalantly, “Hey, there, Donton! What brings you here to my private quarters?”

Donnie raises a brow in disbelief. “Since when did you care about privacy?”

Since he got a fucking dildo, that’s when.

Out loud, Leo says, “First time for everything!”

“Yes. There is.” Donnie’s voice grows sharper, and Leo gets juuust a little wetter.

He rocks on his heels, sweat beginning to bead on his brow. “So, uh, really. Why are you here? Something wrong?”

Leo watches, a little too closely, as Donnie jaw visibly clenches.

“Earlier.” Donnie grits out, “You called me. Something.”

Uh oh.

“Ha- I definitely didn’t call you “Something”, I’d never call my own twin brother a thing.” Leo says, mock outraged with a hand to his chest.

He’s poking the bear, and he knows it.

And he faces immediate consequences as Donnie brings up his wrist tech and- oh, shit-

Somehow, Leo forgot that Donnie records everything.

So they both hear, quite clearly, Leo’s voice echoing out a “Yes, Daddy~”.

Pure, awkward, heavy silence takes its time on the stage, getting a few polite chuckles from the crowd as the main actors of this comedic shitshow let it have the spotlight for a few moments too long.

Then, Leo laughs, a bit pitched, “Huh? I clearly said Donnie-“

In a second, Donnie presses another button, and then Leo’s voice comes out again saying “Big Daddy”. It’s also very, very clear that “Daddy” is what he said. Both times.

…Time for damage control.

“Okay, maybe I didn’t say your name, but what’s the big deal?”

“You called me ‘Daddy’.” Donnie steps closer, and Leo swallows dryly when he notes how they’re exactly eye level now. When did Donnie grow…?

“…So what? I call Raph “Big Daddy” all the time!” Leo defends, his slit rapidly getting hotter the higher the tension gets.

Donnie’s eyes narrow. “Not me. You’ve never once called me that.”

Leo’s losing footing fast, and as always when he finds himself in desperate situations, he goes for whatever lifeline he can.

“What, did you like it?”

Donnie balks, mouth opening and closing like a fish. And then, he turns on his heel and leaves.

…

…Leo feels…disappointed.

Which is…dumb, right? Like, what was he even expecting there? Some porno scene to happen just because Donnie caught his slip up? Of course not. Donnie was probably just weirded out, or wanting to catch Leo in a lie.

That’s it. Anything else was Leo’s stupid little fantasy.

His libido is, for once, completely gone now, so he strips off his gear and wraps himself under his covers.

Fuck. Fuck. What gives? This is just a kink, right? His other, messy feelings are usually much easier to manage, so why does this feel so much like a rejection?

Maybe this is what he needed all along. He’s been wanting to move on from Donnie, right? That’s been his goal!

He doesn’t feel very ‘moved on’ though. He feels much more ‘unrequited lo- lust’ about all this.

Leo just doesn’t get why Donnie ran away.

Over in the other side of the Lair, in the solitude of a lab, one voice clip plays over and over.

“Yes, Daddy~” *click*

“Yes, Daddy~” *click*

“Yes-“

“Fuck.” Donnie runs a hand over his face, the other wrapped tight around his spent cock.

He has a problem.

Leo’s words ring through Donnie’s head long after he stops the recording, and they have been since the slider first uttered them.

By all accounts, Donnie should have just waved the address off as standard Leonardo-brand teasing. He should have just ignored it.

But no! Oh, no, no, no - instead he was overcome in the moment! Reflexively firing off his explosives as his body decided that all his blood should rush south.

Leo immediately denying his words as opposed to playing them up only served to make Donnie focus on them (and him) more.

He knows what he heard. Of course he knows - Donnie has heard his own name fall from Leo’s tongue enough times to tell the difference between “Donnie” and-

…

Point being- Donnie showed his proof. And the consequence of confronting Leo had left him reeling.

Even now, his cock twitches in his grasp, twinges of arousal sparking through him at the mere suggestion that maybe, just maybe…

He did like it.

Of course, this meant nothing. Nothing substantial, at least. Obviously, anyone would have reacted the same way!

Alas, his mind, as grand as it is, betrays him with the immediate reminder that Raph doesn’t react the same way. At least, not to his knowledge. (And here he chooses to ignore the bitter taste in his mouth, knowing that he isn’t even the main one Leo calls a-)

Regardless! Leo is, objectively speaking, naturally alluring. When he’s not being a massive brat, Leo has a tendency to look sultry, and his vocal inflections often follow suit. Loathe as he is to give the self proclaimed “Face Man” a bigger ego than he himself, he can’t deny the facts.

So, Donnie should be excused for having a natural physical reaction! Leo being his twin doesn’t erase the feeling that shot through Donnie when he heard the other’s voice call him that.

Not when his mind decided to go into overdrive, imagining scenario after scenario where all Leo would be allowed to say was-

“Yes, Daddy~”

The glands at the tip of Donnie’s cock flex and spread, eager to continue his fantasies. And, truthfully, he’s not above starting up the voice loop again - he may even add some other parts of his recording collection to it at some point. He has more than enough to work with, after all!

But. Right now he’s…restless. Now, he’s gotten a small taste of a desire he didn’t even know he had. He’s not ashamed to admit he wants more.

He’s no fool, he’s aware his fantasies may be far from his grasp, but maybe…maybe he can get Leo to make a repeat performance.

The mere idea of having power over Leo - authority over him - paired with the slider’s pretty face looking up at him and calling him “Daddy” is one such fantasy Donnie is rapidly obsessing over.

A new goal in mind, Donnie cleans himself up, and begins to plan.

See, when Leo finally passed out after his “hours of staring at the ceiling” pre sleep workout routine, he did so with the feeling of unsure disappointment and a dry slit.

But then his brain decides: “Hey, you didn’t fuck yourself tonight? Don’t worry, I’ll do it for you!”

And that’s how Leo suffers through the wettest dream he’s ever had.

In it, a voice rings out with a “What did you just say?”, making the question much more…intense than it was in the real world.

Said question is followed with a firm “Say it again.”

As much as Leo is beating himself up about having the dream at all, he’s more pissed he’d lost most of it upon waking up.

So all he’s left with is a continued feeling of unsure disappointment…and a very wet slit.

He sighs and reaches down between his thighs.

He definitely did not think of a different pair of hands on him as his fingertip furiously works his clit. And so what if he grabs his dildo and shoves it in without bothering to stretch first! So what if “Daddy, please, please, please-“ falls like a mantra from his lips?

So what if Leo cums to the thought of a hand on his neck, the skin there forever just a little bit sensitive after the fucked up collar that Leo only recently reaaaaally started thinking about?

So what if Leo cums to the thought of Donnie’s hand on his neck?

His later walk of shame to the main area of their lair is just as embarrassing as it always is, and by that he means not at fucking all, because Leo is a really good actor, actually. That, and his dignity gets beaten down enough as it is, thanks.

He has pride, okay?

That pride doesn’t stop him from pivoting away from the main area right before he enters it to portal the fuck away. He makes sure to send a quick text to Raph that he’ll be over at Hueso’s for a while - if he’s gonna be avoiding people then he’s gonna cover his all his bases!

And avoid he did. He goes from bothering Hueso, to messing around with the Caseys, to gossiping with April, to just. Aimlessly walking around, trying to clear his head.

It’s sunset when he gets back. He ended up back at the Lair faster than he intended to.

“Oh, Leo!” Mikey chirps when he sees the slider strutting out of his portal, “You’re right on time!”

Leo huffs out an amused breath at that. “Yeah? What am I on time for, Miguel?”

It’s not Mikey who answers him.

“Why, to participate in some tests of mine, of course.”

Leo whips his head around (and geez, shitty sleep really isn’t helping his neck any.) He immediately spots Donnie standing in the entrance of his lab, and Raph just behind him. Donnie’s eyes are burning into Leo’s soul.

“…okaaay?” Leo laughs unsurely. “What…?”

Donnie lets out an indignant noise when Raph shoves him out of the way. The snapper rolls his eyes as he walks out of the lab and turns to look at Leo. “It’s nothing like it sounds. Just some maintenance work for the comms, I think.”

“That is grossly underselling the value of it.” Donnie grumbles.

Leo looks between all three of his brothers, “Sooo…you’ve all just been doing maintenance and stuff?”

“For the comms yeah.” Mikey nods.

The comms, huh?

Leo feels a prickling under his skin. Donnie seems normal today, but…this being for the comms specifically…

…Maybe it’s nothing?

“Well, since I’m “right on time”, what am I supposed to do here?” Leo asks, bringing himself to meet Donnie’s eyes again, the softshell not once looking elsewhere.

The slight pause shouldn’t make heat pour into his belly but hey here they are.

Donnie wears a grin that Leo’s seen a million times before, sharp and excited in a slightly-unhinged-but-endearing way. It looks a little different than usual, though.

“As stated, I simply need to hone the comms a bit more. You’ll be helping me with the testing.”

Donnie doesn’t give any more explanation than that, pivoting on his heel to stride into his lab, nothing but a hand wave to tell Leo to follow along.

For a brief moment, Leo doesn’t want to. It’s not like Donnie has any actual authority over him, so he’s technically in his right to refuse if he so pleases, though Donnie’s not one to hold back when somebody gets in the way of what he wants. And Leo kinda (really really) wants to see what Donnie would do if he disobeys.

But he spent all day trying to squash down these kind of reactions and feelings - if he’s really gonna move the hell on, then he’s gotta be chill about this.

That means saying no to letting his slit do the thinking. He’s gotta be chill not heated.

So he sends a confident smile Mikey and Raph’s way, even giving a wave as he saunters into Donnie’s lab, fully willing to be so normal and help his brother out.

Then the lab door slams shut behind him. And Donnie is standing there, gesturing to a chair surrounded by cameras.

“Uh.” Leo says, smartly. “What’s all this?”

“Necessary equipment for the testing.” Donnie states, gesturing harder, “Come here, sit down.”

Leo is hesitant and extremely suspicious, but he puts it aside to walk forward. The chair is even more imposing up close, clearly large enough to comfortably hold even Raph and looking more plush than he expected.

“These aren’t gonna like, shock me or something, are they? Just normal cameras?” Leo asks, lightly tapping one.

Donnie rolls his eyes. “I make one collar out of the goodness of my heart and you doubt all my tech.”

“Hey, it’s not the collar part I minded.” Leo’s quick to shoot back.

It’s only Donnie’s eyes widening that makes Leo realize how that sounded, so once again he’s forced to scramble to save face.

“Uh- well, it’s like- that was a cool fashion statement, y’know?” Leo laughs awkwardly. “And I liked how it, uh…how it felt.”

Holy shit he could not have said that any less weird. Well, it’s not like it’s wrong. Leo’s always loved the feeling of something on his neck, and it just so happens that a collar fits the bill, okay? Casey Jr. once mentioned that his older self had a scarf! So it’s not like it’s just collars doing the trick here!

Leo ignores the fact that he kinda liked the shocks too.

Coming out of his attempts to justify himself to his own mind, Leo notices that Donnie hasn’t moved in a bit. He snaps his fingers in the softshell’s face, putting on an easy grin when Donnie startles.

“Hey, man- you can’t drag me in here for nothing! What’re we doing here?”

Leo’s grin freezes in place when Donnie grabs his wrist and stares at him.

“First-“ Donnie starts, “-I didn’t drag you anywhere, you walked in yourself.” His thumb presses into the inner vein area of Leo’s wrist, right where his pulse is currently beating fast. “And if I had, it’d never be for nothing.”

Leo’s mouth feels dry. His eyes too, for how they can’t look away. His slit, however, is very, very wet – which it always seems to be now when he’s anywhere near his twin.

“Second-“ Donnie continues, “-I already told you what you need to do.” His thumb presses in harder, his face coming closer. “Do I need to repeat myself?”

Leo, mutely, finally takes a seat.

Donnie releases his wrist, a gleam in his eyes replacing their previous intensity. Leo misses the pressure on his pulse already.

“Good.” Donnie praises, and wow – Leo’s mind really is his greatest enemy because it instantly puts a “boy” at the end of that and- no. Nope. Moving on.

As Donnie moves away to start up who-knows-what with his tech, Leo regains his ability to speak.

“So…what exactly is this all for again? Maintenance for the comms, yeah, but they were working pretty great yesterday.” Leo pauses, adding, “And you know it too.”

If Donnie is at all bothered by the mention of that incident, then he doesn’t show it, merely twirling around once he seemed to get his computer set up. “Oh, they’re fine of course. But they could be better.”

Leo nods, slowly, “And…you needed all of our help?”

“It’s good to run multiple tests, especially in this. Wouldn’t want there to be any issues talking to each other on a mission.” Donnie explains with a wave of his hand, stepping closer to Leo. “Now, I’m going to need you to say some specific words and phrases.”

“Sounds easy enough. You know I love when my mouth gets some good use.” Okay…that one was on purpose.

Donnie grits his teeth tightly before he moves to stand behind the camera, right in front of Leo. The camera is about Donnie’s height, angled down to Leo’s face.

Pretty much all of the cameras are angled right at Leo’s face, actually. He wonders if they were adjusted for Mikey and Raph when they did this too.

“I’ll be telling you what to say or giving you prompts. You’ll repeat each response a few times each.” Donnie says, voice very even.

“Wait-“ Leo narrows his eyes in realization, “If this is a comms thing, then what’s with the cameras?”

Donnie waves a hand dismissively. “Oh, it’s simple. I’m merely extending my ability to read lips to my tech - this will also help if captions are necessary for whatever reason on our missions.”

Leo looks at Donnie. This…this whole thing has been weird from the start, and Leo knows his twin enough to tell that’s there’s more to this. But Donnie also isn’t lying, notably, so Leo’s feeling very off about everything, really.

…He’ll just go with it.

“Okay, okay, whatever.” Leo settles back in the admittedly very comfy chair. “Give it to me.”

“…Hm.” Donnie hits a button. “Now we’ll start with something simple.” The custom purple recording lights of the cameras blink out at Leo as Donnie looks down at him. “Say my name.”

Absolutely unfair of Donnie to say something like that. As if Leo hadn’t heard that command a million times in a million different ways in his dreams. But, it’s okay. He’s being chill about this, no matter how much he wants Donnie to fuck him into this honestly too comfy chair.

Leo shakes off the hold of his fantasies, gives his absolute best smile to the camera, and says, “Donnie.”

He makes sure to enunciate.

The man himself seems to freeze for a second, but Leo doesn’t look at him. Then he hears a quiet, but firm “Again.”

…Well, if he’s gonna have to do this, he may as well have some fun with it.

So he’s a little more cheeky with the next one, a bit more teasing as he laughs out the next “Donnie~”

He chances a glance up in time to see Donnie’s eyebrows furrow, but still he says “Again.”

Okay. Seems like it’s fine to push things a little, good to know, good to know. Leo well aware it’s just a matter of time before he’s kicked out, so he’ll make the most of it while he can.

He leans forward a little, lowering his voice into the slightest of whispers, “Donnie.”

Even with his eyes on the camera he sees the way Donnie’s fists tighten. ASMR shit must be grating on him, huh?

Or something.

Leo considered doing a joke voice next, but he doesn’t want to get kicked out quite yet, so…he goes with something he’s done before.

The second Donnie says “Again”, Leo leans back in his chair, and remembers how he did this line previously in the comfort of his room, underneath his blankets.

His eyes on the camera, he lets his words escape in the form of a sigh, “Donnie…”

Just shy of a moan.

It’s a dangerous game he’s playing. His safety net is saying it’s “just a joke, Dee!” His dumb hopeful fantasy is that maybe…maybe Donnie also…

“Moving on.”

Leo’s eyes flash up to Donnie, who looks…disappointingly composed. No disgust, no arousal. Just…nothing.

So, okay, that’s a bit demoralizing, but it’s whatever! It’s fine! He’s chill, he’s chill, he’s chill. He’s just here to be a good teammate, a good brother.

He’s so fucking chill.

“What’s next?” Leo grins, doing a damn good job at masking his piercing disappointment. “You want me to say Mikey? Or Raph?”

In an incredibly even voice, Donnie responds, “You just did, so not anymore.”

…Wait, huh?

“What, they don’t get multiple takes?” Leo asks. “Only you get more than one?”

“Mine is enough.” Donnie quickly states, but doesn’t bother explaining further.

Just because Leo’s feeling a little petty, he replies, “Just enough?”

He swears something in the lab sparks at that.

Donnie glares down at him, and now that he’s really looking, Leo can see the stiff way Donnie is holding himself. “We are moving on.”

“What’s next, the alphabet? You want a song?” Leo drawls, “If you ask me to recite the numbers for pi I’m gonna portal away.”

Donnie huffs at that, the slightest smile coming to his face. “As if I’d let you go.”

Oh-

Okay. Leo…will try not to think about that too hard.

“Next-“ Donnie nonchalantly continues on, as if he hadn’t just reignited the heat between Leo’s legs and the beating of his heart. “-I’ll have you repeating similar sounds that can get muddled if not made clear enough. Example being, words such as “go” and “no.”

Leo’s still kinda dazed from the last attack, only managing a slightly stunned “Okay…”

Donnie pauses a bit at that, clearing his throat as he continues explaining, “I’ll be using sounds from our comm recordings, just repeat everything you hear to the camera.”

“Which one?”Leo snorts, a bit of self control coming back if only to make an easy dig.

“You know which one.” Donnie settles back behind the camera, Leo settles back in front of it. “I’ll play a recording, you repeat the words, then I’ll play the second and so on.”

Leo knows there’s a catch here. There’s always one somewhere with Donnie’s tech, and this is no exception. And, tellingly, it’s only now that that gleam in his twin’s eyes has really returned, but Leo still doesn’t know why.

…He really wants to find out though.

Leo makes himself even more comfortable in the annoyingly comfy chair and nods to Donnie, “Go ahead.”

Looking way too pleased with himself, Donnie presses play on the first recording. It’s a cut from…maybe a mission from a few years ago? Leo vaguely remembers it.

He hears himself say “Uh, there’s a lead pipe here.”

The second the word “pipe” is said, he knows why this recording was chosen, and what recording is next.

Not bothering to hide his amusement, he repeats the words - maybe a bit more gleefully than necessary.

“Second recording.” Donnie deadpans, because there’s a reason he chose these recordings in particular.

In this recording, Leo hears himself say “There’s a lead up here!”

He repeats it. They sound so obviously different to him when isolated, but at the time…

He can’t quite hold back the laughter at the memory of him yelling about a pipe and his brothers thinking he said he’d found a “lead” instead, leading to all of them running head first into said pipe in question, denting it as they did.

Leo didn’t stop laughing for hours.

“Yes, yes, chortle all you want but this is why clear comms are important, Nardo.” Donnie sniffs, a hand subconsciously coming up to rub the long gone bruise that encounter had left behind.

Leo doesn’t bring up how the comms have always been pretty clear - that was just a funny mistake that Leo will forever remember fondly. At least the mission wasn’t a failure in the end!

Unfortunately, the next recording wasn’t as funny, just some of those standard “no” and “go” mixups that Donnie had mentioned. But as the recordings played one after the other, Leo got into the groove of copying the words near perfectly! He felt like a parrot, honestly, but like a good one, the kind that’d freak people out from how clearly the parrot could speak.

So lost in his parrot streak, Leo doesn’t clock when a recording makes him say “Yes, Donnie.”

He repeats it as he’s done with all the other recordings. He thinks he sees Donnie lean forward, but they’ve both been shuffling as time goes on, so it doesn’t really register to him.

Then the next recording plays. The words echo throughout the lab and Leo doesn’t process them before they’re already falling from his lips.

“Yes, Daddy~”

There’s a pause, long enough for Leo to look away from the camera and into Donnie’s very, very dark eyes.

And then Leo’s brain finally catches up.

“Wait-“ He sits up straight, almost flailing out of his chair at the speed he moves. He points an accusing finger at Donnie, “Was this- was this all to punk me?”

Donnie is so still. “Hm? What do you mean?”

“This- that recording!” Leo hisses, “After last night, there’s no way you didn’t put that there on purpose.”

“Weren’t you the one who insisted that you’d said my name at first?” Donnie asks way too innocently to be believable, “It’s not wrong to include a potential confusion here.”

““Donnie” and-” Fuck it, Leo’ll bite the bullet, “-and “Daddy” don’t actually sound all that alike, y’know. We definitely heard a difference before, they just both, like…start with a D.”

It’s a bit of a weak defense, and clearly, Donnie agrees.

“If you’d paid more attention to my research throughout the years, you’d know I prefer to be thorough.” Donnie emphasizes, “And- if you’re oh so certain now that they don’t sound the same, why don’t we put it to the test?”

And, despite himself- “…How?”

“Simple. Just like before, I’ll play you recordings of things you’d said, and you repeat them as per usual.” Donnie almost seems to loom over Leo, looking down at him from where he now leans past the camera. “But, this time when you hear my name…replace it.”

It’s not hard to see what Donnie means.

“You’re gonna make me say “Daddy” into a camera a ton…to prove a point?” Leo asks incredulously.

“No.” Donnie foot taps repeatedly, his fists clenching tightly, “It’s…data collecting.”

Yeah, right. More like “blackmail material.”

Because there’s no other reason to suggest this, right? This has to be revenge for annoying Donnie by calling him “Daddy”. No way that “data collecting” bullshit is true, right?

But Donnie didn’t sound like he was lying, and that’s what’s getting to Leo. Because…Donnie doesn’t really lie – at least, not that well. He’ll keep things secrets (like those trackers-) but he’s not a good liar. Leo’s the one more known for that.

Maybe a part of him needs to be delusional for a bit and think that hey- maybe Donnie just wants Leo to call him “Daddy” again.

It’s bullshit, obviously, he’s not that lucky. So, he’ll do this, but keep his hopes down.

And he’ll put on a damn good show.

“Okay, Dee, you win.” Leo says, a bit of a sigh in his voice, “I’ll play along.”

“Good boy.” Donnie doesn’t even give Leo a fucking second to process that before he’s already pulling up a recording. “Remember, you only need to replace one word.”

Throughout the lab, the recording echoes out “Careful, Donnie!”

It’s a standard call, something Leo’s said countless times before. And Leo was just gonna do as he’s done for the other recordings and repeat the words in the same way, but…they could use a little flair.

So, instead, he decides to let the words come out as a purr.

“Careful, Daddy~”

Donnie chokes. From the corner of his eye, Leo sees his brother stand ramrod straight. 

Well, Donnie better get used to this. Leo’s got months of fantasies to draw from and a whole well of sexual frustration to put behind them.

Donnie doesn’t comment on the very different line reading Leo just did. He just mechanically goes to the next recording, and this time Leo hears a slightly more specific phrase, one more often said to the group than just one other.

“Let’s go home, Donnie.”

It’s almost too easy to fall into a pout, his bottom lip jutting out even as a smile threatens to overtake his pleading expression. And when Leo repeats the words, he isn’t just talking about their lair-

“Let’s go home, Daddy…”

-he’s talking about his room. His bed.

Donnie sucks in a sharp breath, and Leo wants to believe that he heard a growl somewhere there as his slit is apparently enjoying this fucked up roleplay a bit too much.

He shifts, his thighs rubbing together, sparks of pleasure starting to light up within him, spurring him on.

Donnie plays the next recording-

“Let’s have some fun, okay, Donnie?”

“Let’s have some fun, okay, Daddy?”

And the next-

“Donnie, you’ll stay with me.”

“Daddy, you’ll stay with me…?”

And the next-

“Hey, Donnie! Watch me!”

“Hey, Daddy…watch me~”

The longer they go on, the heavier Donnie’s breathing becomes.

And the wetter Leo gets.

“Last few…” Donnie mutters, his voice strained and hoarse. “Should be simple.”

He presses play-

And Leo hears the first recording they did today ring out. One simple “Donnie.”

This time, Leo says it exactly as he did last time.

His best smile to the camera, to Donnie, with an enunciated “Daddy” falling from his lips.

After saying it so many times, Leo thought it’d lose its impact. But no, instead, he just wants to say it more.

As the next recording plays, Leo notes that Donnie moves.

In a cheeky, teasing tone, Leo says- “Daddy~”

He keeps his eyes on the camera, even as Donnie slowly walks around him.

Leaning forward, Leo quietly whispers- “Daddy.”

He feels Donnie standing behind the chair.

The last recording plays. When it ends, Leo repeats it.

He leans into the hand on the back of his neck, and sighs out his next words looking away from the camera, to someone offscreen, someone above him, behind him.

“Daddy…”

Just shy of a moan.

The air is hot and electric, Leo would swear he was choking if he wasn’t so high off it all. If he didn’t feel so heated and desperate and empty.

And for as dripping wet as his swollen slit is, his mouth is still dry as he stares into Donnie’s dark, dark eyes.

Everything is quiet.

With a grin and a teasing tone, Leo sighs out-

“What do you want, Daddy?”

Donnie leans down, his hand cupping Leo’s jaw and forcing his head toward him. With no mercy, no hesitation, he bites Leo’s lower lip.

Hot breath on his raw, swollen skin, he hears “I want to fuck you.”

Leo isn’t sure who moved first, but he feels Donnie’s tongue against his, the deft muscle mapping out his mouth. At some point, Leo turned around in the chair, standing on his knees for a better angle - and for once, Leo is glad the chair is so needlessly comfy.

Donnie seems to be making it a mission to gag Leo with his tongue, pressing into him as far as he could, practically melding his mouth to his own. Donnie’s hand moves to the back of Leo’s head, holding him in place with just enough force that, if Leo wanted to, he could break away from.

This is a test.

So when Leo doesn’t move away, Donnie’s other hand trails down, dipping into the underside of Leo’s shell and pressing his fingers into the rarely touched, hidden flesh there. He drags the digits along the length between the slider’s shoulders and Leo’s toes curl.

“Dee, please…”

Leo’s plea is moaned against Donnie’s lips, and though Leo feels the returning groan from his twin, he also feels him pulling away. Embarrassingly, Leo lets out a whine when his bruised lips fall cold, no longer heated by Donnie’s breath against them.

At Leo’s whine, Donnie states, firmly, “Don’t call me that.” His fingers now hold Leo’s jaw, giving it a small squeeze, just barely marking it. “You’ll refer to me in one way and one way only. Understood?”

Leo shudders, the heated, soaked flesh of his slit impossible to ignore. “Y-yes, Daddy…”

Considering how heavily Donnie is breathing himself, Leo’s not the only one struggling here. Still, Donnie manages, with a near manic gleam in his eyes, to utter out a “Good.” before harshly bringing his lips back to Leo’s, the contact lighting up Leo’s bitten skin.

Their kiss is more teeth and tongue than not, as though Leo is being punished for letting another form of address fall from his lips at all. Donnie only lets up on tongue fucking the hell out of Leo’s mouth when he needs to breathe, biting Leo’s lip when he does.

Donnie moves down Leo’s jaw to continue the assault on his neck, just barely digging his teeth into the sensitive skin there as a warning of sorts.

‘Don’t misbehave, or else.’ His actions say.

If punishment feels like this though, Leo’s tempted to act out even more.

He brings his own hands up, fully leaning against the back of the chair as he playfully tap tap taps his fingers against the edge of Donnie’s sandpaper-y, leather shell. He can’t help the teasing grin toward a camera when Donnie’s next bite is sharper at that.

But what ultimately turns Leo into a mess isn’t the bites Donnie leaves, but the soft, gentle kisses he gives afterward. The barest grazing of Donnie’s lips covers more ground than the bites had - a sort of reward for bearing his “punishment.”

The feather light touch sends a full body pulse of need directly between Leo’s thighs. And, when Donnie brings his lips to the side of Leo’s neck, it brings out a high-pitched whine from his chest that he didn’t even know he could make.

Donnie freezes.

“Sweet cherry soufflés-“ He breathes out, drawing away enough for Leo to see just how wide his pupils became. “Do that again.”

Leo lets out a breathless, lust drunk laugh. “That-” He leaves a kiss of his own along Donnie’s jaw, giving a small nip before he draws away. “-was all you, Daddy~”

Donnie takes a harsh breath in, and right as Leo is cursing the chair barrier between them, Donnie is moving around it. Leo blinks, and suddenly he’s on his shell, legs hanging off the side with Donnie crowding between them.

“Then I’ll hear it again soon.”

It’s said with all the self assurance Donnie usually has about his tech or intellect. So much confidence that it doesn’t touch the realm of Leo’s own cockiness, moreso it exists nearer to a point of fact. Donnie isn’t promising anything, he’s stating it.

In this position, Leo’s slit is spread enough to make the need to be speared open on softshell cock go from a “lust filled want” closer to a “basic necessity of life”. He’s turned on enough that it almost hurts to be so empty.

“Please…” He whispers out.

Donnie’s hand moves, traveling down Leo’s plastron, nails lightly digging into grooves and scars until he gets to the end. His fingers spread, continuing to trail further but just avoiding the spot Leo needs them to be.

Donnie’s voice is strained. “Please, what?”

There’s a tension in the air, waiting to snap. A tension that’s been there, building up. Nothing that kisses, no matter how deep, could ever hope to break. And Leo is aching and dizzy from it.

It’s so easy, so right, to look up, and beg-

“Please, Daddy.”

The yellow of Donnie’s sclera gleams.

Leo’s left leg is wrenched upward until his knee is folded against his plastron. He stretches the limb upward, resting it on Donnie’s shoulder in the process. Beneath his heel, he feels the rough leather of Donnie’s shell.

He presses down, just a little, just to hear the low noise he is gifted from the action. Donnie immediately digs his nails into Leo’s thigh as payback. He bites Leo’s calf as it rests on his shoulder, kissing it not after Leo gasps, but after a dark mark is sure to be left behind.

As dazed as Leo’s brain is, it doesn’t escape his notice that Donnie picked a spot just outside of where Leo’s gear ends.

“Trying to make a point to people, Daddy?” Leo laughs, waving a hand to his lightly bitten neck and freshly bitten leg. “That I’m yours?”

“Hum, close.” Donnie hums, pressing in, “These marks are for you.” His free hand runs up Leo’s other leg, nails gliding over the skin until they reach Leo’s shorts. Donnie hooks a thumb under the fabric. “I want you to feel it, feel me. I want you to want more.”

Leo’s grin is teasing. “Just for me, huh?” He pushes his heel down hard, pulling Donnie right up against him so their lips can meet, so Leo can swallow the throaty groan Donnie lets out when they finally rub against each other. “Thank you, Daddy~”

Donnie breathes heavily against Leo’s lips, his gaze flashing with a warning Leo can’t wait to feel. “Of course, this gift was for me as well.” He backs away, only to kiss the mark on Leo’s calf again. “Anything that’s mine needs my mark, remember.”

“You like seeing me all marked up by you?” Leo teases. “All purple bruises, just for you, by you?”

“Obviously!” Donnie huffs, a sharp smile dancing onto his face, “But- I have some other marks in mind for you to wear. Ones I find even more appealing.”

Leo leans his head back, intentionally emphasizes his throat. “I’m guessing it’d go on my neck, hm? Maybe in purple instead of blue for this one?”

“Maybe in both.” Donnie’s lips are right against Leo’s calf once more, moving up his leg and almost to his thigh. “Maybe no shocks this time.”

Leo sucks in a breath between his teeth as the thumb Donnie had in his shorts pushes the fabric up higher, higher, getting close to the pulsing wet need growing ever stronger between his legs. “What if…what if a small part of me…actually liked the shock?”

“Oh ho, so- Leo’s a bona fide masochist, hm? Who could have seen this coming...” Donnie mocks fondly.

“Maybe.” Leo shrugs his shoulders, “But you like it. Didn’t you want me to want your marks? Didn’t you want me to feel it? Besides-“ His eyes go half-lidded, “-it’s only this good from you.”

Donnie’s eyes shut as he takes a steadying breath in. “You are- horribly good at this. Infuriatingly so.”

“My dreams are great practice, Daddy~” Leo winks. “And you aren’t so bad yourself.” He rolls his hips, once more just barely out of friction’s reach. “I wouldn’t be this wet if not.”

Donnie’s eyes snap back open at that, his thumb flinching toward the very same wetness Leo mentioned but stopping right before direct contact.

Still, the proximity is enough to feel the heat. Enough to make Donnie swallow dryly. “That is. Good to hear.”

Leo opens his mouth to continue teasing, but Donnie swoops down before he can get a word out, his tongue back in Leo’s mouth and erasing all of his thoughts in an instant.

Drawing back, lips shining and eyes shining brighter, Donnie says, “There’s another mark I want to see.”

Leo blinks stupidly for a few seconds as his brain scrambles to catch up. When it does, he manages to ask, “What is it?”

Donnie again leans away, and Leo hates that he does but he’s also very curious (and aroused) so he’s willing to let it go for now.

Donnie (meanly, cruelly) removes his thumb from Leo’s shorts and his grasp on Leo’s thigh. He places both hands on Leo’s hips, just above his stripes.

“I want it to bruise here. So it shows exactly what happened.” Donnie tightens his grip. “A reminder, that I fucked you.”

And what is Leo to do but stare up at Donnie, wide-eyed and flushed to hell.

Leo’s on his shell, one leg up on Donnie’s shoulder, and he wants to tease back. He wants to be coy and do some more back and forth until they were both so keyed up that nothing but their most instinctual of desires remain.

But Donnie’s hands are gripping his hips, not hard enough to bruise yet, but it’s enough to make his intentions clear. It’s enough to shoot a fire right to Leo’s slit. It’s enough to add even more electric tension between them.

It’s enough to make Leo whimper.

The immediate tightened grip on his hips will absolutely leave a bruise. But still not like what Donnie wanted. Like what Leo needed.

He lets himself fully fall back on his shell to free his hands, wasting no time ripping the seams off the sides of his shorts.

Before he can fully tear them off, Donnie stops him, hands sliding up to cover Leo’s own.

“Let me.” And, because the seams were already ripped, all Donnie has to do is gently pull the fabric away. It’s slow, intimate and erotic in ways that make Leo whimper again.

“You’re doing this on purpose-“ Leo pants out, his wet inner thighs sensitive as the chill air of the lab hits his heated flesh little by little.

“Just a bit of self-indulgence...” Donnie mutters, pulling enough fabric to bare Leo’s thighs completely.

All that’s covered now is Leo’s slit, tastefully covered by the scrap that was once Leo’s shorts. The cloth is soaked through, and adds just enough friction to fan the flames of Leo’s arousal but nowhere near enough to do anything about it.

He needs it gone, now.

He resorts to desperate measures.

“Daddy, please-“ Is all Leo manages to get out before the fabric is finally ripped away from him.

The chill air against his thighs has nothing on how it feels against his swollen hot pussy, especially at the angle he’s in.

In his current position with one leg up on Donnie’s shoulder, Leo’s slit is just barely stretched open, winking out as though begging to be filled. To be stuffed until it overflows.

Then Donnie goes and puts his thumbs on either lip, stretching it out more.

Leo scrambles, a heel digging into Donnie’s shell for purchase as a full body shock courses through him.

Donnie’s fingers massage the sensitive skin, playing with him. Each little press sends volts of electricity through Leo’s entire body, making him keen. One of Donnie’s thumbs travels upward, spreading Leo’s slick with it until it brushes a certain nub-

“Not there-“ Leo gasps out, body shaking even from such a brief touch. “It’s too much- don’t- not yet-“

“Ah-“ Eyes dark, Donnie spares one more calculating glance at Leo’s clit before he nods. “Duly noted…” His eyes get a suspicious glint. “And good to know.”

“S-Sounding kinda ominous there, Daddy…” Leo’s eyes narrow. “Planning something…?”

“I might be, something for a later date though…” Donnie admits, cruelly massaging Leo’s slit even more, but taking care to avoid Leo’s clit. “Tell me, on a scale of one to ten how do you feel about overstimulation?”

Leo’s mind stops.

“It’d be easy, I could specially make something for you, and something to hold you in place-“ His thumbs press in harder, “-and keep you there until I let you go.” His nails dig in, slightly- “Personally, I’d love to witness it at least once, if you agreed to it.”

Leo grabs Donnie’s hand, stopping the softshell’s words at once as Leo says in a low, low voice, “Daddy, if you don’t fuck me right now then you’re never gonna see that.”

Donnie’s eyes gleam. “Your demands have been heard, and my future plans filed away.”

And one of the thumbs that had been toying with Leo’s slit for so long is thrust inside.

The sound Leo makes is somewhere between a gasp and a moan as finally he’s being filled. It’s just a thumb, so nowhere near what he really needs, but it’s still Donnie.

Donnie wastes no time running his thumb along Leo’s inner walls, his own breath growing heavier and mixing with the erotically wet sounds echoing throughout the lab. “You feel- good.”

Leo can’t help but laugh at that, “J-just- just good? More- more like perfect, Daddy~”

Donnie huffs in amusement, “I believe that’s for me to judge.”

“Mm, and- you’ll agree too! When you- fuck- when you actually fuck me.” Leo attempts to purr out, trying to speak through the erratic jolts of pleasure Donnie’s thumb is giving him.

An eyebrow raises. “Be impatient all you like, but I want to make sure you’re stretched first.”

“This- this is good enough, Don- Daddy, I swear.” Leo insists, rolling his hips as he tries to fuck himself on Donnie’s thumb. “M-more than I usually give myself-“

Donnie pauses.

Leo keeps babbling, “Usually, if- if I’m in the mood for- for some alone time, I just-“ He shifts, shivering, “I just shove- shove my dildo in, y’know?”

Donnie’s thumb begins some slow, shallow thrusts as the softshell asks, “Doesn’t that hurt…?”

Leo tries to match the thrusts, focused on what little blips of pleasure he’s able to get even as he answers honestly- “If I’m horny enough and- and wet enough…Yeah, it still stings a bit, but-“ He pants, a dreamy grin on his face, “-Nothing feels better.”

Donnie continues his bastard streak by pulling his thumb out of Leo, much to the slider’s dismay. Before he can put up a fuss, however, the familiar sound of fabric tearing fills the air.

“”Nothing feels better” hm?” Donnie asks, “Care to test that notion?”

Donnie’s hand goes between his own legs, and Leo immediately shifts up to watch as Donnie slowly drops into his hand, the shiny, large cock veiny and absolutely dripping with precum. It hangs heavy and hard between Donnie’s thighs.

And it’s easily larger than Dildotello.

Leo tries to pretend that he’s not actively drooling at the sight as he somehow manages to say, “That needs to be inside me, fuck more stretching, gimme that now.”

Donnie hesitates, even as he moves closer to Leo, his cock catching on the slider’s folds. “Are you sure…?”

“No more stretching.” Leo churrs, shifting to grab Donnie’s hand and lick his own slick off his thumb. “I want to really feel you. Please?” He presses his lips against Donnie’s palm, speaking against the skin, “Daddy?”

Leo feels Donnie’s cock twitch at that.

A thrum of excitement and lust floods Leo’s body and leaves him feeling dizzy as Donnie once again folds Leo’s left knee to his chest and crowds in between Leo’s thighs even more.

“If you keep calling me that-” Donnie growls, lining himself up. “-I won’t be able to hold back.”

Leo feels the four, flower-like glands of Donnie’s cock kiss his slit, and, lightly, barely, graze against his clit. It’s maddening- the proximity alone is enough to make Leo so aroused and wet he’s lightheaded from it.

Still, he replies, “Good.”

Donnie thrusts forward.

A gasp traps itself within Leo’s throat. His fingers dig tightly into the chair under him, the only thing keeping him steady. Between his thighs, inside of him, there’s a feeling of burning tightness - a band about to snap as his walls are stretched to their max.

“Ah-“ Leo’s breath manages to break free in the form of a choked off whisper, the act of using his voice at all making him hyper aware of the current onslaught of feeling flooding his body.

The feeling of being filled. Stuffed full until it’s all Leo can hope to focus on.

Above him, Donnie shakes, struggling against overwhelming sensations of his own, and Leo feels him, feels the head of Donnie’s cock just a couple inches past his entrance. The petal-like glands push at Leo’s insides, rubbing his walls and making a tight heat coil itself at Leo’s core - a pleasure bordering on painful.

It stings, more than he’s used to. It’s a dull, aching jab that makes him screw his eyes shut and breathe harshly just trying to get used to it.

Donnie isn’t even halfway in yet.

“Give- give me a second-“ Leo pants out between breaths, his whole body shuddering. “It’s- you’re a lot-“

“O-oh.” Donnie’s voice is a funny mixture of pride and concern, wobbly from his own pleasure, “Okay- yes, of course- a second, right, that- that makes sense-“

For some reason, Donnie’s rambling makes Leo relax, and that tight stretch slowly unravels within him as he’s reminded that he’s doing this with Donnie.

Leo rolls his hips a little, grinning when Donnie’s grip immediately digs into him. “You- you can move now-“

Donnie nods, his jaw clenched as he, slowly, pushes forward. His cock is hot within Leo, and the farther he pushes in, the more Leo loses his fucking mind.

“Faster-“ Leo whines, whining louder when an attempt to roll his hips again is halted by Donnie’s hand. “I’m good now, go all the way-“

“You…you can wait.” Donnie huffs, sweat beading on his neck as more and more of his cock is enveloped in a tight heat.

The drag is agonizing, a blinding pressure that builds little by little. Leo’s pussy hungrily takes that pressure in, desperate to be filled and even more desperate to be fucked.

A sentiment that Leo shares wholeheartedly, trapped in an endless, edging pleasure.

“I only- fuck- only needed a second-“ Leo trembles, “At least fuck- fuck me a little- You don’t need to go- go all the way yet-“

Leo’s voice is abruptly cut off by the hand firmly grasping where his jaw meets his neck.

“You. Can. Wait.” Donnie hisses.

He keeps his hand on Leo’s throat, holding Leo in place as he focuses entirely on making the slider take every single inch of his cock. And Leo feels every. Single. Inch. And as Leo is slowly, slowly speared open, he’s quickly being taken apart by the seams.

At long fucking last, the tip of Donnie’s cock kisses some part deep, deep within Leo. The contact makes Leo gasp, white hot pleasure igniting his lower half. A guttural moan violently courses through him as his spasming walls eagerly stroke Donnie’s cock for more.

Donnie’s hips give a tiny, involuntary thrust at that, his breaths coming out in heavy huffs as he clearly attempts to reign himself in.

But Leo’s so tired of going slow.

“Daddy…” He mumbles, pulse beat beat beating against Donnie’s fingers. “Please.”

There’s a violent twitch deep within Leo as the glands of Donnie’s cock flex eagerly. The slightest bit of friction that gives almost makes Leo cry, his swollen slit clenching tightly around Donnie and making softshell suck in a sharp breath.

Donnie’s hand leaves Leo’s throat and quickly places itself on the slider’s hip, his other hand keeping a solid, bruising grasp on Leo’s stretched out leg. Donnie’s hips snap forward when Leo pushes his heel against Donnie’s shell, drawing him in, in, in.

There’s no warning as Donnie pulls back - nearly pulling out- and rams into Leo again, drawing an outright scream from Leo’s throat.

“A- a “please” was what did it?” Leo laughs deliriously.

“I’m partial…” Donnie admits in a low voice, “To hearing you beg.”

Before Leo can fully process the line that will haunt him for many wet dreams to come, Donnie thrusts into him again, slow but hard. Little fireworks of bright hot pleasure are set off beneath Leo’s skin whenever Donnie so much as moves an inch inside him.

Every time that Donnie thrusts back into him, Leo’s walls welcome him back, his folds wrapping around Donnie’s cock like it belonged there. It makes every slow, slow pull out even more mind numbingly frustrating, because Leo feels so fucking empty during it.

“Why- why are you going so slow?” Leo huffs out between breaths, “I know you- you wanna really, really fuck me so please-“

Leo is cut off by a hard thrust, forcing the words back down Leo’s throat. Donnie lets out a low moan, his cock twitching deep inside Leo.

“I- I told you…” Donnie pants out, hands branding bruises into Leo’s skin, “I’m partial to your begging-“

It clicks immediately what Donnie means by that.

“You’re gonna make me beg you to fuck me?!” Leo asks incredulously, even as he pulls Donnie closer, pulls him deeper into him.

“I’m more than happy to deliver when you do.” Donnie states calmly, rolling his hips in a wonderfully cruel way, his cock a hot weight sitting solidly within Leo.

“”Wh-When”” not “if”, huh?” Leo manages to get out. “And- if I don’t?”

Donnie’s eyes flash dangerously at that.

“In that case-“ He mutters, “Then I suppose my current pace is satisfactory enough!”

To make it a point, Donnie pulls out at the same even speed he’s been doing, ramming back into Leo harshly before he pulls out completely. He repeats it again and again and again.

And Leo is so sure that he can hold out for this one. That obviously Donnie is gonna crack first and lose control. Donnie is stubborn as hell, but so is Leo! And Leo been edged by life enough to take this in stride. He can totally outlast Donnie here, no sweat!

He believes it until Donnie’s thrusts are so deep that they make their slits kiss. A single touch against Leo’s slick wet clit, barely visible amongst the swollen folds of his fucked out slit, is enough to make his toes curl and his body burn.

Each grazing touch only ever lasts for just a second.

And because Leo can’t win, Donnie notices.

“What’s wrong?” He asks, just a bit pettily, dragging his cock out, out, out, then slamming it back into Leo’s wet hole. “Enjoying yourself?”

What a bastard.

“Mmhm-“ Leo nods as best he can, holding on for dear life, “Couldn’t- couldn’t pick a more perfect pACE-!”

Donnie times his next thrust to cut Leo off, making full contact with Leo’s slit again, the pleasure maddening. The friction against his clit makes Leo fucking chirp reflexively, and he swears he feels Donnie’s cock spurt hot precum inside him at the sound, branding the sensation into Leo’s mind and walls forever.

“I feel you-“ Donnie says, his voice breathy and wavering, “Tightening around me-“

Leo, not for the first or even the last time that night, can’t help but let a whimper escape him. His willpower is very, very quickly being overcome with every thrust.

“But-“ Donnie’s next thrust takes on a new level of force, and Leo bites his tongue hard to stop the shriek from escaping him. “-You know I can do better-“ Another forceful thrust, another swallowed down shriek. “I can fuck you- exactly how you want-“

Leo decides, in that moment, that he’ll avenge his pride later. It’s been dead for a while anyway, and his arousal is very, very much alive and burning.

On the very next thrust, the very next time Donnie’s body rubs friction against his clit, Leo breaks.

“Please-“ The first plea of many passes Leo’s lips so naturally- “Please, fuck, fuck, please just fuck me already-“

The more Leo speaks, the faster Donnie fucks him, but only slightly better than the snail’s pace he was at before. “Keep…keep going-“

“Fuck me-“ Leo babbles, his thighs parting as best they can from where they already were spread, . “Please, Daddy, fuck me, I need it, please-“

There’s a stutter in Donnie’s meticulous movements, one that Leo immediately catches because he can feel it happen.

“Say- say that again-” Donnie demands, his nails digging into Leo’s skin, more bruises left behind, “What you need, say it-“

“I need it-“ Leo repeats, the magnitude of truth in his words making them easy to cry out, “I need it, please, Daddy, I need you-!”

Both of Leo’s legs are suddenly over Donnie’s shoulders. 

The sudden change in position makes Leo’s mouth drop open in a silent gasp, the change making Donnie’s cock feel even bigger. When Donnie leans down right after, his hands leave Leo’s legs, forcing the slider to hastily cross his ankles to keep them up.

Donnie wastes no time planting his hands on either side of Leo’s head, his fingers curling over the side of the chair. Leo can hear the material deforming from the force of it. Donnie somehow pushes into him deeper-

How is Leo ever supposed to live with being empty again?

“I need you.” Leo whispers the words, the inferno in him quiet for all its intensity, “Please, Daddy. I need you to fuck me.”

Donnie looks down at him, closer than before. He says, with a small grin, “…Who am I to deprive you of what you need?”

He pulls out so far Leo feels the glands of Donnie’s cock tug at his slit’s lips before he is hammered back into. He doesn’t even get a single second to catch his breath before Donnie is thrusting so fast Leo’s sensitive walls are rubbed raw.

It only adds to the experience, the drag of Donnie’s petaled cockhead pushes into just the right places, moving Leo far past an inferno and right into a goddamn supernova of arousal.

“Fuck, yes, yes-!” Leo laughs, high on lust and pure bliss, “Thank you, Daddy~!”

Leo’s laugh changes into a scream as Donnie adjusts his angle and repeatedly pounds at a spot Leo didn’t even know he had. Walls spasming in pure pleasure around Donnie’s cock, Leo’s not even sure if he already came once or not, drenched in slick as he is.

A hand goes to its familiar position, cupping Leo’s jaw, sitting right at his throat as Donnie fucks him like a machine.

“Magic is fucking- bullshit-“ Donnie snarls, “But this has to be a spell, what- what you’ve done to me- fuck-“

His thrusts grow feral.

Leo mindlessly and haphazardly rolls his hips to meet him, chasing his high and the friction that kindles it.

He grins, dreamily, and breathes out between the thrusts, “I- I think you- you only have yourself to blame- hah-“ He trembles, “Being so- so you- god-“

The rubber band has long since snapped, Donnie’s cock getting no resistance now as he fucks Leo’s pussy to the point where it’s all Leo is aware of anymore. Just a single-minded, brutal fucking that feels like Donnie is branding himself into Leo’s very core.

Slick and precum both drip down Leo’s pussy, his thighs, even to the edge of his shell, adding to the wet sounds of sex filling the lab. Leo feels Donnie’s petal-like glands flexing and reaching as though they’re trying to grab onto him from the inside, trying to keep Donnie locked in deep.

The tug Leo feels every time Donnie pulls away just makes that all the more clear, and the sensation only makes Leo that much more turned on. Everything from the chair below him to the chill of the lab air against his heated skin is driving him insane.

And all of this happened because they were both unbearably horny, huh? All of this happened because Leo slipped up and called Donnie what he was. What he is.

“Daddy-“ Leo sighs out, then cries out when that immediately prompts a harsher fucking from Donnie.

“Leo-“  Donnie grits out in response, and god hearing his name said like that is just- wow.

But- “Don’t I get- ah- a pet name too?” Leo teases as best he can while getting railed out of his fucking mind. “It’s- ah-! It’s not- not fair that only you get one, y’know…”

Donnie hums, “I’d- I’d considered a few. Made a list. But-“ He rams into Leo, harder for every word he emphasizes- “What would- what would work best?” A sharp thrust- “Baby?” A hand moving from Leo’s throat to his cheek- “Beautiful?” Donnie leans in close- “Love?”

All three of those steal Leo’s voice away, making some of the blood that had been so invested in heating and puffing up his slit rush back up to his cheeks in a sudden flush. But…it’s that last one that hits him the hardest.

‘Love.’

It’s embarrassing, how much that gets to him.

It’s so embarrassing, that that’s what finally makes Leo move a hand up to hide his face. He’s being fucked so hard he’ll be feeling it for a week afterward, but the idea that Donnie would call him Love? That love has anything to do with this? Fuck.

Almost immediately, Donnie slows down his thrusts. Leo would be more upset about that (and he is) but-

“Sorry- was a line crossed?” Donnie quietly asks, sounding incredibly self-conscious and contrite and no-

“No! No, I liked it!” Leo insists into his palm, staying hidden.

“Of course.” A bit of Donnie’s deadpan comes out, and Leo knows him enough that he can hear how unsure he still sounds, “And- you’re hiding your face because…?”

Leo’s admission is muffled. “I really, really liked it.”

“…Two ‘reallys’.” Donnie notes.

“Yeah.”

Leo’s hand is gently removed from his face, leaving him to feel more exposed and vulnerable than he has this entire time - and Donnie is inside him, so that’s saying a lot! He can’t help but turn his eyes back to Donnie’s face, meeting a gaze that never once has turned away.

“In that case, Love-“ The name sends a shiver over Leo’s body as Donnie says it, not quite pleasure but something close, something just as bright- “Could you do something for me?”

Leo gives a small grin, “Anything for you, Daddy.”

Donnie’s breathing gets heavier, his hold on Leo’s hand going from gentle to inescapable.

“Keep talking-“ Donnie says, his hips moving, slowly regaining the momentum he’d lost. “Keep looking-“ His eyes flash- “You can stop when you pass out- only after you feel my cum spilling out of you-“ He leans down, kissing Leo deeply, “…Can you do that, Love?”

Leo pulls Donnie in close, his heels digging into his soft shell, and he delights in the way Donnie’s pupils grow wider at the action.

“If you’re good enough to make me pass out-“ Leo starts, breath hot against Donnie’s lips, “Then show me, Daddy.”

If Leo thought he was being fucked before, it’s nothing compared to the way Donnie is fucking him now. The mere act of touching upon something a bit more intimate, a bit more personal, has apparently hit the “emotionally unavailable bad boy” hard enough for him to go wild.

Donnie pounds into the puffy flesh of Leo’s pussy so roughly he turns the skin there bright red. Leo’s slit aches, every thrust sending pleasure all throughout his body, especially between his thighs. His walls spasm but Donnie plows right past the tightness.

“Daddy-“ Leo babbles, because he was told to talk, and just this once he’ll be good- “Daddy-“

There’s a stutter in Donnie’s thrusts again, “Yes- yes, fuck- keep talking, Love-“

And Leo does, mindless words falling from his lips as Donnie fucks him stupid.

The only word he knows for sure he’s saying is the one that got him here in the first place.

Every time Donnie plunges back into Leo-

“Daddy-“

Fucking him to the hilt, their slits touching-

“Daddy…!”

Leo moans, shrieks, and screams out-

“Daddy-!”

All the while, his eyes, filled with tears, stay on Donnie. Even when the pleasure darkens Leo’s vision, he keeps looking.

Leo’s next set of spasms makes Donnie’s breath hitch, his thrusts growing shallower, wanting- needing to stay fully inside Leo’s wet heat, the softshell’s cock valiantly trying to lock him in.

The closer, shorter thrusts are just as hard as the long ones and even more addicting, as Leo’s clit is now constantly feeling a mind blowing amount of friction that pushes Leo past simple tears to full on sobs. Even Donnie’s eyes go dewy from his own immense stimulation.

But despite how much it is, neither of them can get enough. Every thrust Donnie gives is matched by Leo, every bit of friction, the wet heat between them connecting them, it all pushes them to almost obsessively chase the high that’s so nearly at its peak-

The drag of skin on skin, fluids mixing and pooling below, wet heated flesh slapping roughly against each other- Leo just needs one more thing to push him over. He’s been edged so long that he’ll only accept one option now.

He screams, moans, begs- “Please, Donnie-!”

It’s Donnie’s actual name that does it.

Donnie snaps his hips forward, rolling them again and again and again as they stay flush against Leo’s own. His cock goes deep, deep, deeper than Leo ever dreamed as those petal-like glands unfurl and finally lock inside.

Leo is forced to just take it as Donnie’s cock paints his walls with molten hot cum. Never once does Donnie stop moving as it does, his slit rubbing against Leo’s, melding them together, desperate to get even deeper still and roughly grinding against-!

Leo sees white.

The sensation of being filled, bred, stuffed full of Donnie’s thick cum combined with the unending stimulation of both his pussy and his clit sends Leo into a whole body orgasm, copious slick mixes with cum, just a little of which even managing to spill past the plug that is Donnie’s thick cock, the rest locked deeply inside.

Leo’s moan turns into a satisfied churr.

Donnie’s mouth is quickly on his, an answering churr from his own chest only adding to it all. It’s almost too much, but Leo meets Donnie’s ruts eagerly, chasing the ride of pleasure as long as they both can make it last until Donnie’s last spurts of cum end.

Finally, Donnie stops moving, and their kiss ends long enough for them to catch their breaths. Leo feels Donnie’s heart beating fast, right near his own. And still, even though some cum managed to spill past where they stayed connected, the majority filled Leo up to the brim, hot and thick and stuffing him completely.

“You know, you always came inside in my dreams too.” Leo hums out dreamily, maybe just a little obsessed with the sensation.

Donnie snorts, wearing a small, tired smile, “I suppose I should work on the plug ideas I had for you then, since you seem to enjoy it so much.”

Leo grins back, as impish as he can in his current state. “Oh? You already had ideas?”

Donnie sputters, pouting when Leo dissolves into laughter. “You aren’t the only one with dreams…”

“Glad you find me dreamy too.” Leo kisses the ensuing groan from Donnie’s lips.

He’s really tired now, though. Not getting enough sleep combined with being out all day combined with the best sex he could ever hope for combined with laying on the most unreasonably comfy chair ever is enough to do in anyone, he thinks.

He can’t help but yawn.

Sure, his position isn’t the most comfortable anymore, but he finds the feeling of Donnie’s softened cock inside him weirdly comforting in itself. He snuggles his face into the crook of Donnie’s neck.

Donnie rubs Leo’s head. “…About to pass out, Love?”

“Mhmm…” Leo yawns again, chuckling slightly when Donnie gives one himself and immediately gives a complaint about it. “You took a lot outta me, Daddy…”

Donnie is quiet for a moment, and Leo almost falls asleep when he hears- “You called me ‘Donnie’ at the end.”

“Oh.” Leo struggles to keep his eyes open. “Guess I did, huh?”

“Why?” Donnie pushes.

“Maybe it felt right.” Leo’s legs slide off of Donnie’s shell to loosely wrap around him instead, making a bit more cum spill out in the process. “Besides, I liked you way before I thought of you as a ‘Daddy’, haha…”

Leo loses his fight with his eyelids, his vision going dark as his eyes finally close. Distantly, he thinks he hears a small “you did?” but he doesn’t quite process it.

The last thing he knows is a calloused hand on his cheek over his stripe, and a quiet “me too.”

As Leo goes limp under him, Donnie takes a moment to observe the slider.

He brushes his fingers along the fading blush of Leo’s cheeks, careful to keep his touch as deft as he would for his more delicate of projects. He doesn’t want Leo to wake up quite yet.

Donnie can barely wrap his head around the fact that this happened at all. But looking down at his twin looking so thoroughly wrecked, and by Donnie himself is…

His cock twitches at the thought, still nestled so deeply inside Leo’s wet heat.

He bites down a moan when Leo’s walls reflexively pulse around him, the slider giving a soft sigh in his sleep.

Donnie had never felt anything like this before, and he’d be lying if he said he didn’t want to fuck Leo awake for another round, but…right now, he needs to process.

He’d set up the maintenance check up solely to record Leo calling him ‘Daddy’ again - he didn’t realize things would go this far. But! He’s more than happy with the outcome, even if it wasn’t what he initially set out for.

Besides, he did get his recordings.

…Many recordings, actually. He has a lot of audio to listen to after this.

And a lot of video to watch.

Donnie recorded them having sex - from many, many angles, at that. Again, not the initial intention, but luck appears to have graced him generously - though just this once he’ll ask if Leo is fine with him keeping such recordings in his files.

Somehow, he doesn’t think the slider will mind.

His cock twitches again, and he shudders as that prompts Leo to once again clamp down on him. The velvet walls gripping him, heated flesh drawing his cock further in, inviting him as though hungry for anything he could give-

He forces himself to not thrust forward.

Instead, he slowly pulls out, wincing as the cold air of his lab hits his sensitive member. When he finally sheathes his flaccid appendage, doing it as quickly as he can to combat the sudden cold from overstimulating him, his attention is quickly shifted elsewhere.

As his cock fully leaves Leo’s really, really addicting heat, Donnie’s cum flows out after. Thick rivets of white spill out, the spend mixing with slick as they both run down the still swollen lips of Leo’s battered slit. The skin there is red, nearly bruised, and absolutely wet.

And that slit is framed by striped thighs that have overt markings from Donnie’s hands - clearly primed to develop into deep bruises as the days pass-

Donnie closes his eyes tightly and mentally brings out his list of “Topics to Think About to Ward Away Arousal.”

In his mind, he goes through almost 40% of the list before his budding arousal quiets once more. The list contains over 456 entries, but clearly it needs more if he’s to survive Leo’s presence after this.

He takes a deep breath, taking in the scent of sex.

It dizzies him for a second, but he hurriedly pulls himself together to - reluctantly - leave Leo’s side to find something to clean the slider (his partner? Lover? Mate?). He acquires what he needs and gets to work, taking a wet cloth and gently wiping Leo down.

It should be quick work, but Donnie takes his time. He runs the rag over Leo’s tender flesh, careful to be even more light handed over the slider’s clit.

To this, he imagines Leo saying “Thank you, Daddy” and it’s- more intimate, less arousing as he thinks it.

…It still is very arousing to think of, truth be told. And…maybe it’s a sort of post-coital softness getting to Donnie, but he just wants to take care of Leo right now.

After Leo’s clean, he works to rid himself of the unwelcome sticky substances on his own body as well. Then, he picks Leo up, because as comfortable as he made sure the chair was, it was still just a chair at the end of the day. There are better places for Leo to sleep than having his lower half hanging off the side of something.

Like, for example, Donnie’s bed.

Or, well, his lab bed, the one he has separate from his actual room for those nights where all he requires is a quick power nap before he throws himself into the thralls of whatever scientific inspiration takes hold of him.

He’d slept there last night too.

Donnie lowers Leo down onto his mattress, wasting no time joining the other beneath the soft blankets. He sends a short message to Shelldon to make sure no one comes into the lab any time soon, feeling a surge of pride when the other doesn’t question the order.

He draws Leo close to him, a soft amusement rising within him at the content churr Leo makes when he does so.

…The night really did go more perfectly than Donnie could’ve ever hoped for. More than he could’ve ever expected.

And as he falls asleep…

He makes a mental note to make Leo another collar.