Chapter Text
If there was one thing Katsuki didn’t believe in, it was that there was such a thing as the one . Soul mates. True love. Whatever you wanted to call it, he firmly believed that it didn’t exist. Like the universe gave two shits about who you fell in or out of love with, or would ever go so far as grouping/pairing people off. Romantic love in humans was uninfluenced, random, and definitely didn’t follow some kind of cosmic plan.
That being said, Katsuki was begrudgingly willing to admit that maybe, just possibly, Izuku was as close to the one as Katsuki was ever going to get.
It took a long fucking time for him to get to that realization, time mostly spent trying to pull his head out of his own ass. But he’d managed, somehow, and by some fucking miracle Izuku had actually forgiven him for all the stupid, terrible shit he’d done in his youth. Even more miraculously, he’d loved Katsuki back. Had loved him for years, apparently.
Which was why Katsuki was so put out, even anxious, when it became apparent that something just wasn’t right in their relationship. He was pretty sure he’d narrowed the issue down to their bedroom but even knowing that he still couldn’t pinpoint it.
He’d come so far, worked so hard to get this relationship. He was not going to just let it slip through his fingers that easily. So when Izuku collapsed next to him in bed, sighing loudly when he should be glowing from his orgasm, Katsuki finally lost his temper. He propped himself up on his elbow and stared his boyfriend down.
“Alright, you’re gonna have to fucking talk to me,” he growled, running his free hand roughly through his hair. He was gross and sweaty after their fuck, but a shower was evidently going to have to wait.
Izuku blinked those ridiculous green eyes up at him, but Katsuki had known him long enough to be able to tell when he was feigning innocence. “What do you mean, Kacchan?”
Katsuki growled low in his throat again. “You know what I’m talking about, asshole! Do you think I’m stupid? You’ve been twitchy and restless ever since we started going out and it’s only getting worse. You’re always horny but you never seem satisfied, and you avoid the topic of sex every time I bring it up. Is there-” For a moment he choked on the words, the admission, before barreling on, “If there’s something wrong you’ve got to tell me. Either the sex or…something else, with us. It’s really pissing me off that you haven’t said anything.”
He was really hoping that it was just a matter of Katsuki being terrible in the sack, as embarrassing as that was. But it wasn’t like he was particularly practiced so that was something easily fixed, versus a bigger problem like Izuku simply being unhappy in the relationship. During the years when Katsuki hit puberty and should have been experimenting, he’d been too focused on his training to really pay much attention to the urges and changes he’d gone through. Later, after graduating U.A. and becoming a pro-hero he’d finally broken down and had sex for the first time, mostly because said urges had started affecting his work. It hadn’t been mind-blowing or anything. His partner had been someone random chosen specifically for the fact that they’d be easy to forget once he slipped out of their bed. After that he’d started a pattern of hooking up when and only when his hand stopped being adequate, which happened maybe once or twice a year. Then he went back to his hero work and fucking into his own fist when he had to.
When Mina had learned about his sex life she’d laughed her ass off and told him she’d never taken him for a “pump and dump kind of guy”. It wasn’t like he was a selfish lover or anything though; he always made sure his partners came and so far he hadn’t had any complaints.
Until now.
Izuku bit his plush bottom lip, averting his gaze. A sure admission that there was something wrong, something he didn’t want to tell Katsuki.
With effort Katsuki bit back the urge to tell him to fucking spit it out already, if only because pressuring someone to talk when they didn’t want to wasn’t the way to build a healthy relationship.
Then again, neither was hiding a problem and refusing to communicate about it. All that stupid therapy he took never said navigating a relationship was going to be this fucking difficult.Or maybe it had and he’d just missed that part.
Finally Izuku sighed and sat up in their bed. Katsuki followed suit and then watched warily as Izuku grabbed his laptop off the bedside table then scooted closer so that their hips were touching. When he glanced up at Katsuki, his eyes were dark and unsure.
“There’s…” he paused, seemed to consider his words for a moment before continuing. “There’s something I feel like I’m not getting from the sex we’re having. But it’s not something I need so much as want, which is why I haven’t brought it up.”
Katsuki’s brow furrowed, confused. “You expect me to believe that it’s not a necessity when you’re completely unhappy with our sex life?”
Izuku’s gaze skittered away again, his shoulders drawing tight. “Do you know what BDSM is, Kacchan?” he asked quietly.
The acronym was vaguely familiar, if only because he was an adult who spent a normal amount of time on the internet and around other people so he couldn’t really avoid picking up certain things. But he definitely didn’t know the specifics. “It’s that kink shit, right? Bondage and stuff,” he tried.
“Sort of,” Izuku huffed. “But it’s…more than that. Can I just show you something? It might be easier than trying to explain.”
Katsuki gave his assent and Izuku quietly opened the laptop. Rather than pulling up the internet like Katsuki was expecting though, he started digging through several files until he opened one with a single video inside it. The video was unnamed but was marked with a date from three years prior. Izuku’s finger hovered over the pressure pad, not quite clicking as he glanced up at Katsuki out of the corner of his eyes.
“So…I want you to know that I still have this only because I kind of forgot it was still on my laptop until just now. And also this was way before we started dating.”
Katsuki’s eyes narrowed in suspicion. “Okay,” he replied warily, and Izuku’s shoulders hunched up even further. Feeling kind of shitty, Katsuki rubbed gently at his boyfriend’s lower back and shuffled closer. “S’fine, just show it to me.”
Exhaling slowly, Izuku finally clicked on the video. A small black player opened, taking up half the screen. The video itself was about forty minutes long and it opened with an unsteady shot of someone’s shoes.
“Shit,” said an unfamiliar voice, loud over the laptop’s speakers. “Hold on, I think I got it.” The camera wobbled and then panned up to focus on a bed. A bed where Izuku was tied face down, his wrists and ankles attached to the frame by thick, black rope. Katsuki couldn’t help his sharp intake of breath and beside him Izuku shifted nervously. Is this a fucking sex tape? What the fuck.
The person behind the camera finally steadied it before stepping around and approaching the bed. His bare back was broad and well-muscled, blond hair messy and pulled back into a small ponytail. Katsuki glanced at his boyfriend out of the corner of his eyes, unable to miss this stranger’s resemblance to himself.
“Can’t believe you wanted to film this,” the stranger said teasingly, drawing Katsuki’s attention back to the screen. “Gonna beat off to it later, slut?”
The Izuku tied down moaned brokenly, and even at a distance and distorted digitally, Katsuki could see the way his thighs were trembling, sweat forming along the small of his back. He also couldn’t help but notice that he had never heard that particular sound from his boyfriend before now.
“What, the bruises I’m going to leave aren’t going to be enough for you?” The stranger got his knees on the bed, running a teasing finger down Izuku’s spine that made him arch. “Gotta have something permanent to remind you of how good it feels to be put in your place?”
“Please,” computer-Izuku said, sounding close to sobbing. Katsuki frowned, wishing he could see the expression on his face but unable to with the camera angled the way it was.
A sharp smack rang across their bedroom as the stranger suddenly smacked Izuku’s ass, making him cry out. But he didn’t sound like he was in pain. He sounded like he loved it.
For the next twenty minutes Katsuki watched silently as Izuku was degraded, spanked, dirty talked, and fucked so roughly Katsuki actually winced in sympathetic pain a few times. He moaned, screamed, and was full on sobbing by the time the stranger untied him and pulled Izuku into his arms.
There were twenty more minutes to go and both men in the video were still hard and ready to go. But Katsuki suddenly couldn’t watch anymore. Not once he’d seen the blissful expression on Izuku’s face. It was red and shiny with tears and his eyes were nearly rolled back in his head in pleasure. He was slurring every word out of his mouth and his cock was so hard it was weeping and an angry red where it slapped against his stomach as he was fucked.
Katsuki reached over and hit the pause button. He couldn’t. He’d never seen Izuku look like that before. They’d slept together plenty of times now, and it…well, it was nice. Katsuki certainly enjoyed it, and Izuku came each and every time. But he never looked like that . He was usually laughing a little or smiling or gently urging Katsuki on, but he’d never lost control. Never drooled all over himself or cried or truly moaned.
Katsuki had never truly satisfied him, apparently. And wasn’t that a kick in the fucking teeth.
Izuku fidgeted next to Katsuki for a moment before finally closing the laptop with a quiet click. “So,” he said, quiet and kind of long and drawn out. “Thoughts?”
There was a tumble of thoughts in Katsuki’s mind, and straightening them out took all of his concentration for a long, uncomfortable moment. But eventually he asked, keeping his voice as even as possible, “Is that…are you asking me to do that to you?”
“Not that, exactly,” Izuku said quickly, tucking an errant curl behind his ear. He still wasn’t looking at Katsuki but he shifted where they were pressed together, bare legs brushing. “There are lots of things we could try or do together. I can even find some lists and you can tell me what you might be interested in or…” Izuku had turned to Katsuki while he was speaking and whatever he saw on Katsuki’s face made him go silent. “Kacchan?”
“Is this because of when we were young?” Katsuki choked out, the words thick with shame and anger. Because it seemed obvious what happened from his perspective. He bullied Izuku both physically and verbally as a child, Izuku was in love with him, Izuku then got older and burgeoning sexuality got thrown into the mess and bam. Weird abuse fetish.
There was another tense silence, Izuku’s eyes narrowing as he tried to follow Katsuki’s logic. Then his normally soft face screwed up uncharacteristically in anger and he threw himself from the bed before Katsuki could stop him. “Why are you trying to make this about you!?” he demanded, snatching his underwear off the floor.
Anger snapped through Katsuki just as quickly and he snarled. “Maybe because I did this exact kind of shit to you, minus the sex, as a child?”
“Newsflash, asshole!” Izuku said, whirling around with his hands still on his waistband, “Not everything is about you! My kinks are my own and have nothing to fucking do with you pulling my pigtails when we were kids.”
“Like hell!” Katsuki snapped in response, grabbing his own sweatpants from where they were laying across the mattress. “Clearly I fucked you up and then you hit puberty and-”
“No!” Izuku’s voice was like a whip crack and made Katsuki pause, one leg in and one out of his pants. “Would you just listen to me?” The words were softer, and Izuku stepped closer, reaching out to cup Katsuki’s face in both of his hands. “You need to stop letting your guilt complex cloud every single thing that comes up between us. My kinks are not anyone’s fault , but they’re especially not yours. And before you say anything, they’re not unhealthy either. They’re completely consensual. It’s really and truly not about you.”
The anger in Katsuki faded little by little, leaving behind only confusion and distress. He licked his lips and tried to muster up the anger again and failed. “How could you want…want me to do that to you all over again?” he asked and it came out softer, more vulnerable than he was intending. “I spent so long treating you like shit, why would you…?”
Izuku sighed and his shoulders loosened. “Kacchan, there’s a huge difference between bullying and consensual BDSM. What you did when we were kids…well, I can’t say it didn’t affect me. But it certainly didn’t give me my kinks.” He paused, seeming to way his words before offering, “I can teach you, if you’ll let me. About BDSM. It’s not something you have to be interested in, you can always decide it’s not for you. But it’s something I like so I’d really appreciate it if you just gave it a chance. For me?”
Images flashed through Katsuki’s mind of Izuku unsatisfied after they’d had sex, of the way he skirted the subject, how he smiled placatingly like he didn’t want to hurt Katsuki’s feelings when he asked if Izuku had liked it. Then he thought of Izuku’s face in the video, how he seemed to be coming apart at the seams with pleasure.
“Tell me what you get out of it,” he managed. “If it’s not about me, then what is it about?”
Izuku was silent for a moment, considering. He bit his lower lip, then shrugged a little. “I like to give up control sometimes. I don’t really know what you want me to say here, Katsuki.” The use of his actual first name was nearly a blow to the gut and Katsuki’s breath caught briefly. “I’m a masochist who enjoys certain kinds of pain and I enjoy being degraded.”
Katsuki blew out the air that had caught in his throat. “I can try,” he finally said, gruff. “But I don’t think I’m going to like it much.” Nothing of what Izuku had said resonated with him in any way. He just didn’t understand how Izuku could enjoy… that.
“That’s all I ask,” Izuku breathed, and leaned in to kiss him. Either unaware of or choosing to ignore Katsuki’s discomfort. “Thank you, Kacchan.”
oOo
Katsuki knew he had something of a guilt complex, especially when it came to Izuku. It wasn’t something people would expect from him, for obvious reasons he thought. But it was there. Sitting low and heavy in his gut. It was hard not to develop one when you spent so long with your head up your ass, not considering the feelings of others.
Izuku told him that he wasn’t inconsiderate and was a good friend, actually, but Katsuki not-so-secretly didn’t believe him.
The problem with the guilt complex was that it wasn’t something he could just ‘get over’ so easily. Which was why when Izuku handed him a list of common BDSM kinks he felt sick to his stomach just taking the damn thing. Next to each item were two check boxes, one for ‘receiving/partner’ one for ‘giving/self’. He was supposed to check the ones he was interested in or might be willing to try, and put X’s over the ones he was unwilling to touch. Izuku had promised to share his own list once Katsuki was done.
“The ones online are a little more thorough,” Izuku told him, “but I figured we could start here.”
Katsuki’s stomach churned and he tried not to cringe as he started reading. Then he paused, reread the first few items. They were…surprisingly tame. ‘Clothed sex’ and ‘lingerie’. He marked both down with checks in the partner category. Lingerie would look good on Izuku he thought, and he always thought he might like to fuck Izuku when he was in uniform. It was just so form fitting.
After a moment he also checked the box for ‘giving/self’ on the clothed sex option. Maybe Izuku would like to be fucked while Katsuki was in costume too. Or some other outfit. He definitely wasn’t unaware of the looks Izuku gave him when he came home from a workout, or the odd occasion he had to wear formal attire for some event or another.
The next few questions were about the number of people involved. He marked the one about masturbating for each other as good for both receiving and giving, but then put X’s for the threesomes, foursomes, and orgies. BDSM he thought he could try, but an open relationship or a poly one like what Kaminari, Kirishima, and Mina had? No, not up his alley.
After that point was where it got...interesting. The next section was all specific sexual acts, quite a few of which he’d never even put much thought behind. Fisting got an X but the rest were good and he flushed a little thinking about face-sitting and having Izuku’s strong thighs wrapped around his head. Orgasm denial gave him a little bit of a pause but he thought it through and considered maybe forcing Izuku to wait to come might not be so bad…Then the guilt complex spoke up and told him how fucked up it was that he’d try to be so controlling, and over an automatic bodily function to boot. It received an X.
A moment later he erased the X, leaving it blank for maybe.
The next few categories were even more graphic and had his stomach squirming. There was an uncomfortable amount of interest sparking in him as he read through some of them, and he tried to squash it down ruthlessly. Spanking, slapping, degradation, unsanitary play (Izuku has to explain that one to him), and blood all got immediate X’s. After some consideration, light bondage and discipline were the only things he left blank as maybe and everything else was crossed off.
When he handed the paper back to his boyfriend, Izuku didn’t look surprised. He just nodded his head as he glanced over it. “Okay, this is a good place to start! I can make a scene from this.”
“...Scene?” Katsuki asked, almost unwillingly.
“Uh, just what having sex while doing some of this stuff is called. Sometimes it's an entire scenario, like teacher and student roleplaying? Sometimes it’s being tied up. And sometimes it’s just trying new stuff we’ve never done before. Actually it’s not even always sexual now that I think about it? Uh, it’s just, you know-” he gestured broadly, as if to encapsulate the entire spectrum of BDSM.
God, who knew sex could be so fucking complicated? “Fine, so you’ll plan a scene for us,” Katsuki said. “Using…all of the ones I said maybe on?”
“Not all at once.” Izuku scanned the page again, sucking at his teeth. “I think maybe we can start with something simple. Clothes and discipline maybe? Oh, here’s mine by the way.” His boyfriend produced another sheet and Katsuki took it. It was identical to the one he’d just filled out, but covered in far more check marks than Katsuki’s. Apparently Izuku was into…well, a lot of it. At least they were in agreement about unsanitary stuff, blood, and fisting. Unfortunately Izuku was into some of the ones that really made Katsuki’s guilt complex come to life. All the things that his mind read as straight up abuse.
Izuku must have been able to read Katsuki’s expression because he smiled softly, a little sadly. “Don’t worry, just because I’m into it doesn’t mean I’m going to make you do it. I just…would like to try some of the stuff you’re comfortable with, okay?”
“It’s fine,” Katsuki said gruffly and shoved the paper back at Izuku. But his boyfriend just gave him both pages and told him to hold onto them.
First chance he got, Katsuki threw the papers into a drawer by his bed. Out of sight, out of mind.
oOo
The ‘scene’ as Izuku called it didn’t happen for a week. During that time they were too awkward around each other to have sex like they usually did, and Katsuki was pathetically grateful for that. He didn’t know what the rules were anymore, what was expected of him, if Izuku would even like the things he was trying to do for him.
So it was a relief. Instead of sleeping together they just hung out like usual and went about being the best goddamn heroes in Japan.
Until the day Izuku walked into the bedroom still wearing his costume. There were locker rooms at the agency so they didn’t usually come home in uniform, and plus this was an older one of Izuku’s. Katsuki knew because there were rips along the thighs from an unfortunate incident involving a lot of concrete and dragging.
Katsuki set aside his phone where he’d been reading a news article, and sat up in bed. His heartbeat was already starting to pick up in anticipation, and not the good kind.
“How’d you know I was thinking about your uniform when I checked that box off?” he asked, trying for casual. Izuku pulled his cowl off and smiled sheepishly at him.
“Good guess? You just…well, you look at me sometimes.”
Katsuki’s gaze travelled down Izuku’s body and he felt himself settle a little. After all, he was attracted to Izuku like this and had thought about this scenario before. Though usually they were in the locker room after patrol, sweaty and amped up on adrenaline. He’d never let himself indulge in those fantasies too much though, shying away from the idea of something so rough or public.
“Okay. How do we do this?” he asked, anxiety coming back as he realized he didn’t actually know what he was doing.
“Well first we need to establish some stuff.” Izuku sat on the edge of the bed, cocking his head to the side. His hair was still wet -he must have showered at the agency- and his cheeks were flushed from the heat of it. Katsuki was willing to bet he was still a little damp under the clingy fabric of the outfit. “Like, what we’re comfortable with, and also a safe word.”
Katsuki was silent, not really knowing exactly what Izuku was talking about, but he gestured for his boyfriend to continue. He understood the concept of a safe word in abstract, but why would they need it?
Izuku breathed out a nervous breath. “Okay, safe word first. I usually use ‘All Might’ for mine. It’s uh, just a word that either of us can say to make everything stop if you’re uncomfortable or in pain.”
“What’s wrong with ‘no’?” Katsuki asked.
Izuku squirmed where he was sitting. “Sometimes saying no is part of the play,” he admitted sheepishly, then quickly added, “that’s not what we’re doing right now! But it’s better to have a safe word that won’t come up naturally. Like if I asked if you wanted me to stop doing something, and you said no, that might be confusing, you know?”
Katsuki tried to parse through the logic of that but just shrugged it off after a moment. It still didn’t make sense but he doubted it ever would. “Fine, okay, if you or I say ‘All Might’ the other will stop what they’re doing.”
“Right!” Izuku agreed with a smile.
“Anything else?”
“Um, well…” Izuku trailed off, squirming a little where he sat. “I figured we’d just clarify what we both want. It’s called negotiating, you kind of list out exactly what you do and don’t want. Like, maybe if you don’t want to have actual sex or something?”
“Why wouldn’t I want that?” Katsuki asked, a little thrown. Now that all of this was in the open, was Izuku going to refuse to fuck him until he got what he wanted?
But Izuku just shook his head. “You’re misunderstanding me. I just mean that all of this is new, so if you wanted to keep it not too intense we can do that.”
“This is needlessly complicated,” Katsuki decided after a moment. “Why are there so many rules and shit? Why do we need a step by step plan just to fuck?”
Izuku ducked his head, looking upset now. Goddamn it, that hadn’t been Katsuki’s intent. “It’s…look, I’m just trying to set up the precedent, okay? If or when we ever get into the heavier stuff, this kind of communication is really, really important.”
“Fine,” Katsuki said. “I’d like to have sex with you. Good?”
Something unknotted in Izuku’s tense shoulders. “Yes, thank you, I also want that.”
It felt so ungodly stiff that Katsuki could barely stand it. As if sensing his discomfort Izuku sighed again. “Look, it gets more natural with time. It won’t always be like this, if we keep doing it. Plus, once we’re more practiced together there’s less to have to talk about. So today, we’re going to have sex with me in the suit, and I’m going to introduce you to a little discipline.”
“Can we just get on with it?” Katsuki snapped instead of replying to that. At this point he wasn’t sure he was even in the mood anymore. Was he ever? Maybe for a brief second when Izuku had walked in wearing the ripped suit, the pale skin of his thighs on a tantalizing little display.
Then Izuku had gone and ruined it.
Izuku stood from the bed and came around the side, close to where Katsuki was sitting. “Come here,” he said, and this at least Katsuki could do easily enough. He swung his legs over the side and Izuku stepped between them immediately.
“Do you remember,” Izuku asked, laying his hands on Katsuki’s shoulders, “what you told me the day this suit was ruined?”
Katsuki’s hands found Izuku’s hips easily enough. “That you were an idiot?”
The corner of Izuku’s mouth ticked up. “I think you were a little harsher than that.”
“Maybe. Why though?”
“Well-” and Izuku crawled right into Katsuki’s lap, arms draped over the blond’s shoulders. His expression was sultry, something Katsuki hadn’t seen often from him, “today I thought maybe you’d like to get all that anger at me out. I was so careless, you know?”
Katsuki could see where this was going and his fingers flexed on Izuku’s hips. An angry fuck? Punishment and possessiveness all rolled into one? Is that was discipline was about? It wasn’t something Katsuki hadn’t thought about before. After some missions he wanted nothing more than to pin Izuku down until he realized how stupid he was, that he couldn't take the risks that he did, that he belonged to- Katsuki cut the thought of. No. That was wrong. That level of possessiveness was abusive. It was controlling. Bile rose up the back of his throat and he swallowed it down with effort.
“Don’t you want me to be more careful?” Izuku continued, softer now like he could see the struggle in Katsuki’s eyes. He probably could. Katsuki felt stiff and uncomfortable, his hands locked into place. “Shhh, it’s okay. This is the place to do it. Say all the things you want to say. It’s okay.”
It should have felt patronizing, Izuku’s murmuring and assurances. But Katsuki looked down and saw the rips along Izuku’s thighs all over again and…and it rushed forth. His hands turned into claws on Izuku’s hips, yanking him closer before he realized what he’d done. He checked his strength but just barely.
“You’re so fucking stupid,” he growled, finally making eye contact with Izuku again. Those green eyes stared down at him, bright and hot with excitement. “You put yourself into stupid, dangerous situations over and fucking over again, no matter what I say to you and you don’t listen. What am I going to do if you get yourself fucking killed, huh?”
“Maybe I like the danger,” Izuku goaded and it was playful. Katsuki knew it was meant to goad him. It wasn’t real. In the real world, Izuku would never brush his concerns off like this. But this wasn’t the real world. Katsuki’s emotions about Izuku’s safety certainly were but right there and then within the confines of their bedroom, those emotions were only fuel. Disconnected from the reality they emerged from.
Izuku leaned down, until his lips were brushing Katsuki’s ear. “Don’t you want to just rip a hole in this suit and fuck me? Put me in my place and show me why I should listen to you?”
A shiver worked its way down Katsuki’s spine and he reacted before thinking once again, this time twisting his body and throwing Izuku down to the mattress. He was on all fours over his boyfriend, his breath coming heavy, feeling wide eyed and a little out of control. There was a heat in his gut and he was achingly hard. He wasn’t even sure when that had happened. He’d never felt quite like this before.
Arousal for him had always been an afterthought. It came with touch. It came after intent was already in place. He felt it when he was touched, when things were already physical. This…this was different. This was hunger and flame and need. This was looking and wanting.
This was new.
“You’re infuriating,” Katsuki growled, even as he stared down at his boyfriend and tried to figure out what the fuck to do with himself, with Izuku.
“I know,” Izuku said simply, and solved some of Katsuki’s problems by putting his arms over his head. His crossed his wrists, and this at least Katsuki knew about even if he’d never let himself do it. One hand found Izuku’s wrists and pressed. Izuku’s spine arched and he gasped, a sound Katsuki had never heard from him before. In real life, anyway. He had heard it plenty on that damn video. And didn’t that thought just add more fuel to the flame in his stomach?
“You’re reckless,” Katsuki continued. “And push yourself too far, and jump into situations too quickly, and sometimes I just want to tie you up and lock you the fuck away so maybe you’ll be safe for once.” His stomach swooped once the words leaft his mouth because…well, it was fucked up that feeling, right? To love someone so much that you’d hurt them, confine them, keep them to yourself?
Before he could spiral Izuku was arching against him. “Show me,” he said, sounding breathless. “Please?”
And wasn’t that worse? That Izuku was willing to indulge Katsuki in these fucked up feelings?
Regardless, Katsuki did show him. He ground down against his boyfriend, slotting their pelvises together until they were both moaning. Izuku was hard and leaking against his suit, and that was new, that was exciting. He’d never gotten hard before Katsuki had actually touched him before.
Katsuki sat up on his knees, letting go of Izuku’s wrists. “Don’t move,” he told his boyfriend, and his voice came out sharp as a knife, authoritative. It was the voice he used when giving orders on missions, and Izuku visibly shivered at the command.
“Yes, sir,” he said, the words rocking through Katuski like a physical thing. His mouth twitched into a sneer despite himself, continuing to play this game Izuku had set him to.
“Now if you only you listened this well out in the field,” Katsuki said as he put his hands on Izuku’s chest, sliding them down over the sleek material of his body suit. It was slightly rough to the touch, but not unpleasantly so, and fit like a second skin over Izuku’s toned but svelte form.
Inevitably Katsuki’s fingers found the tears along the thighs, brushing over the revealed flesh there, pressing into it to watch the way the plushness dimpled and reddened. He’d always had an urge to put his mark there, where he knew Izuku was sensitive, to see him purple and bruised, but Katsuki was so good at burying those thoughts that even now he brushed them off. He could hold Izuku down, he could speak harshly, but actually hurting him? Bruising him? He was drawing a line there.
At least for now.
“I will, I promise,” Izuku said, drawing Katsuki back to the situation. He had his hands held dutifully over his head still, but he was gently writhing under Katsuki’s touch, missing the pressure on his cock from Katsuki’s grinding most likely. “Please, I will, just-”
“Just what?” Katsuki snapped, “Fuck you?”
“Yes!” Izuku thrust his hips up, as if he wanted to show Katsuki how hard he was and prove how much he wanted it. He’d never been so needy for Katsuki before, though it certainly didn’t compare to the Izuku he’d seen in that damn video. That one had been nearly beyond words.There and then, Izuku’s bright green eyes were lightly hooded, his mouth open just a touch, but he was perfectly coherent.
Still, this was more than Katsuki had ever gotten out of him before. Gone was the joking, the gentle guidance, the sighing and hidden disappointment.
“On your knees,” Katsuki commanded, sitting back on his heels. Izuku was quick to comply, wriggling around on the bed until he was on hands and knees. His suit clung attractively to his ass, to the long line of his spine.
“Good,” Katsuki said, and watched a shiver run through his boyfriend. Huh, so praise was useful as well as degradation, huh? Good to know, he supposed.
Running his hands down Izuku’s back, Katsuki reveled in the feel of him. Mere touching had never felt this good before, especially with an entire layer between them. But there was something about the power in this, the control. Knowing that Izuku wanted him enough to listen to his every word. Touching Izuku to sate his need but also to wind him up higher. And maybe that was a little controlling but it was what Izuku was asking for right now, right? It was a good kind of control because Katsuki was bringing him pleasure.
Feeling more confident, more aroused, Katsuki did something he’d been thinking about ever since Izuku tore this damn suit. He dug his fingers into the rips and pulled. The fabric, even specially made for heroes, was no match for Katsuki’s strength and determination. It came apart easily and Izuku gasped as more of his flesh was revealed. Katsuki was right, he was still damp from his shower, and his bare skin was hot to the touch.
“Fuck, I’ve always wanted to do that,” Katsuki said, feeling heady as he ripped at the suit again, until Izuku’s entire ass was bared to him.
“I’ve always wanted you to,” Izuku admitted, arching his spine further. “Just rip my suit off and fuck me good and hard.” He sounded dreamy and wistful about it, like Katsuki wasn’t going to give him that fantasy here and now.
So Katsuki fixed that.
It was easy to be greedy, once he let himself. It was okay in this context, that was why Izuku had been trying to show him right? That right here and now it was okay to let his hands roam, to take what he wanted, to be demanding and dictatorial. He opened Izuku on his fingers and then took his own pleasure, feeling possessive, feeling powerful, and it was heady. Too heady. But Izuku cried out under him again and again, urging him on with dirty whispers and begging until Katsuki felt like he was going to go out of his mind.
His final straw was when Izuku begged him to come inside. They both got tested regularly as part of their physicals for work, so they knew they were clean, and Katsuki preferred not to use a condom, but he also didn’t really do that. Usually he pulled out and finished on Izuku’s thigh or back, or in his own hand. It was easier to clean up for one, and for another…well, the idea of creampieing Izuku just kind of did something to his brain. There was something so primal and animalistic about the act, something so unbearably possessive, which was a stupid way to feel. He wasn’t a fucking caveman or a bro dude bragging about how many pussies he’d creamed. He didn’t need to come inside his boyfriend as some kind of mark of ownership or whatever. He was a rational adult man. Which was why he never let himself do it, even if everything inside him irrationally, needlessly wanted to.
But Izuku begged him to. He was moaning and crying under Katsuki, making these gasping noises that went straight to Katsuki’s dick because he was punching them out of Izuku’s chest and not some stranger, and really what was a man to do when he heard that? Katsuki’s orgasm rolled over him before he could stop it or try to think clearly and he shuddered, groaning. Izuku’s body was tight and wet and hot around him, milking him as Izuku himself came against the sheets.
Despite his sensitivity, Katsuki thrust until neither of them could take it anymore and then finally pulled out. Watching the slow rush of cum that followed in his wake was hypnotizing, dripping down Izuku’s perineum to his balls, and Katsuki was struck with the stray thought that he wanted to get a plug so he could keep his cum inside Izuku at all times. He wanted to watch Izuku try to train or fight with his ass still full, the plug keeping him nice and open, ready to take Kasuki’s cock whenever or wherever-
Katsuki cut the thoughts off and went to grab a rag to clean his boyfriend up with. He collapsed into bed after, and Izuku relaxed beside him, boneless in a way Katsuki had never seen before. But not so exhausted he didn’t pop up onto his elbows and give Katsuki a tentative smile. “So,” he said expectantly, sounding worn out. “Thoughts?”
“About?” Katsuki deadpanned, still catching his breath, which earned him a halfhearted smack on the arm and an eye roll.
“The sex,” Izuku insisted, wriggling closer. “It was different, right? You seemed really into it.”
“I…” His own thoughts came circling back to every greedy, possessive idea, and the moment when he’d let go and allowed them to consume them. And now…well, now he was tired and would like to go to bed soon and his boyfriend was smiling down at him, satiated. So obviously it wasn’t the end of the world or anything. “I did enjoy it,” Katsuki finally settled on, which made Izuku beam.
“I knew it! I’ve never seen you like that before. You’re always so careful with me.” He said the word ‘careful’ with a wrinkle of his nose, like it offended him.
“Yeah, well, I have my reasons.”
Izuku rolled his eyes again. “I know you do. But I’m glad I could help you unwind a little like that. Think you want to do it again?”
“Well not right this second, no,” Katsuki quipped, then continued before his boyfriend could hit him again. “Yeah, I think I could stand to do that again.”
This round went well enough, right? So why not, fuck it.