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“Take this, you annoying fuck!” Katsuki roars, palms exploding as he hurls toward the villain who has been terrorizing citizens for the past two hours, using his quirk illegally to turn people into hybrids. From alligators to a damn peacock, the citizens of Musutafu have been animalified, and Katsuki needs to put a goddamn stop to it. He’s been dodging the warping black blasts coming from the man’s hands, hoping he has some sort of limit, but after two hours of chasing him and over fifty citizens—from the ones he’s seen, and from what dispatch has told him over the comms—it doesn’t seem like this skeevy bastard has a limit to his quirk.
Katsuki’s explosion hits the way he wants to, exploding against the guy’s side, a low-grade blast but hard enough to knock the wind out of the man and stun him. It works, and the villain chokes out a violent gasp, eyes widening before setting harshly with determination as he goes down, but not without firing a blast point-blank at Katsuki’s chest. It hits, and Katsuki doesn’t stop his momentum downward, rolling the villain over and slapping quirk-suppressor cuffs on him as his body tingles and shivers. He barely has a moment before everything gets so loud all of a sudden, body aching and lungs gasping for air as he hunches over slightly, feeling suddenly so wrong. The loud steps of Eijirou coming up behind him make him groan as his head pounds.
“Hah! Looks like I get the last laugh, Dynamight,” The villain on the floor cackles, grunting when he’s wrenched up by Eijirou. “Knew you’d be a fucking mutt,” The man seethes, and Katsuki growls deep in his throat, surprising himself when it becomes visceral and loud. His throat vibrates, and his fists clench hard, fingers suddenly feeling too big in his gloves. Katsuki looks down at his hands, hissing at the sounds that seem overwhelming. Fucking shit, his head hurts.
“Kats? You okay, uh, dude?” Eijirou comes into his field of view, looking both concerned and a second away from laughing his ass off. There’s a weird tremble to the edges of his lips, a telltale sign he’s holding in a laugh.
The fuck is there to laugh at?
“Why the fuck wouldn’t I be?” Katsuki bares his teeth in a sneer, flicking his tongue over them, wincing slightly when his tongue catches on a strikingly sharp canine. “The fuck did that bastard turn me into?” Katsuki seethes, quirk popping off, sparks fizzling out in the air as his entire body bristles in annoyance.
“Uhh…a… a dog. A fluffy one, at that,” Eijirou coughs loudly to hide a snicker as Katsuki feels his tail—his fucking tail! what the fuck?!—brush against his back leg, eyes widening as he peels his gloves off, hooking the fabric between his sharp teeth. Under his gloves, his hands have morphed into something that could be called paws… sort of. His fingers are as long and big as usual, but there’s a stark dusting of dirty blond fur starting at the tips of his fingers that fades into his usual flaxen color as it tapers off at his wrists, morphing into his skin. On the tips of his fur-tipped fingers are honest-to-god dog nails, which look too sharp for his own good, and when he turns his hands over, the fur is thicker, and he has fucking paw pads.
Paw. Pads.
PAW PADS.
“Oh my god, you have paw pads! Dude! That’s so cute!” Katsuki feels his ears flatten—and holy shit, that is weird—as he growls at Eijirou, snapping sharp teeth at him and wrenching his hands back when he tries to poke at his paw pads.
“No fucking touching, you asshole. I gotta… fucken’ get out of here; feel like my heads gonna explode,” Katsuki sneers, head already starting to throb as his ears swivel madly, taking in every sound. It feels weird, but so familiar at the same time, like he’s been doing this shit his entire life as his ears work back and forth and shift his hair. There are so many new things to process: scents, sights, sounds, the whole fucken shebang. Katsuki can tell if he doesn’t get out of here soon, he’s going to do something drastic and tear a throat out. With his teeth.
Eijirou is the closest, and his throat looks mightly tearable. Especially 'cause the bastard won’t stop snickering and hiding it terribly.
Fucking… fuck, he really needs to get out of here. His temper is already starting to burn, and anger is simmering in his blood. He feels like he’s fourteen again and just barely keeping himself from tipping off the edge into a sea of rage that would have consumed him; opened its yawning maw, and never let him go.
“Yeah, yeah. Go, man, I’ll hold off the press! We’ll let you know how long it takes for the quirk effects to wear off!” Eijirou gives him a big thumbs up as Katsuki tugs his gloves back on, grimacing with the way his fingers are now cramped inside due to his nails. He’s going to need to cut those when he gets home… will human nail clippers work on dog nails? Fuck, he has no idea.
The press is starting to swoop in on him like annoying-ass vultures, cameras flashing and questions thrown at him, making his head pound and his vision swim with all the different flashes and colors. It wouldn’t bother him, but now his eyesight feels too sharp, and he might lose his lunch on the battlefield with all the lights and sounds overwhelming him. That hasn’t happened in a long time.
Katsuki crouches down, hissing as his knees pop from a two-hour chase before rocketing off into the air. Wind whips across his face as he flees, and the smoke from his explosions makes wrinkles his nose as the potent smell.
-
“M’home,” Katsuki mutters as he slips into his penthouse, sighing at the silence and dimmed lights. Everything feels like too much, and he’s not sure how much more he could handle when it came to rocketing through the air with his explosions. His ears are designed to withstand the loud sounds, but even so, he feels like his hearing has turned up to a twelve on a scale of ten with these stupid ears. Katsuki raises an eyebrow when he gets no reply from Deku, but he’s sure the nerd is doing something. He can hear him in the living room, but Katsuki needs a shower and a fresh pair of clothes because fuck his stink. “Gonna take a shower,” Katsuki calls out, shedding his hero suit and shoes, leaving him in just a pair of black boxers that cling to his skin. Katsuki braves a glance behind him, seeing the swinging, fluffy tail that’s attached to him. It’s similar to the fur on his hands, a gradient of dirty blond to flaxen, from the base to the tip. His fur is long and sharp-edged, similar to his hair.
Katsuki scrubs a hand down his face, hissing when a nail nicks his cheek, yet another problem in his life.
Man, fuck this.
-
Katsuki braves a shower, grabbing Deku’s stupid All Might shower cap to protect his ears. From having a dog growing up, Katsuki knows you can’t get water in their ears, so washing his hair will have to wait. Or maybe he’ll rope Deku into helping him.
Every crinkle of the shower mask sets him on edge, grating on fried nerves as he lathers himself up and washes himself off, happy to just stand under the warm spray and wash the day off of him. The suds that slough off his body are caked in dirt, but there’s no red in the mix. Nothing more than a few bruises, thankfully. Katsuki would probably go mental if he had sustained anything more than that.
His tail swings lazily behind him, calm and relaxed as the warm water dilutes the tension in his muscles, allowing him to relax finally. Two hours of running around the city chasing that annoying bastard, trying not to get hit, and he does at the end. He should have backed off for a minute when the villain went down before going in for the capture, but he didn’t, ending up with him having fucking dog ears, dog hands, and a fucking tail.
God, fuck his life.
Katsuki groans softly when he finally turns the spray off, already missing the warm water as he opens the shower door and hisses at the cold bite on his warm skin. There’s water dripping down his body, and his tail is soaked, another aspect he hadn’t thought of. The mirror is decently fogged up, but Katsuki can still see himself as he tears the shower cap off his head, shaking his dry hair and running a hand through it. He’ll definitely need Deku’s help with washing it later, as he’s pretty sure he ran through his yearly quota of cobwebs, and they are all stuck in his hair.
“Fucking… god, I’m hungry,” Katsuki mutters, licking his lips as he towels himself off, slipping into a clean pair of boxers, sweats—which he keeps low on his hips to allow his tail to move freely—and a tank top from the clothes Deku puts out for him to have whenever he returns from a shift. It’s the tiny things that makes him love his boyfriend—who is a tiny thing, heh—even more than he does already.
Speaking of said tiny boyfriend, where the hell is here?
“Deku?” Katsuki calls out, making sure to keep his voice lower than usual to keep his ears from suffering. His headache has waned, but he’s unwilling to kickstart it again. He pads through the penthouse, finding Deku on the couch, staring at the TV, which is now broadcasting the quirk accident about him. He can see himself, back turned and tail swinging around as he stares at his hands. His ears are flicking like mad, which Katsuki didn’t realize was happening at the moment, more panicked about the fact he had been turned into a fucking dog hybrid than anything else. The names on the screen talking about if it’s permanent, how cute he looks as a dog boy—which, fuck that person—and other stuff as the footage from just an hour prior is being spread around. “Oi,” Katsuki huffs, watching Deku startle, whipping around to stare at him like a fish.
A very weird-looking fish.
“U-Uh, K-Kacchan,” Deku looks at him weirdly, making Katsuki’s brows furrow and his ears pull back, a pit in his stomach opening up. Shit, why is Deku looking at him like that? What is going on in that nerd head of his?
“The hell is that face for, Deku?” Katsuki snaps, feeling open and raw. Why the hell is the nerd looking at him like that? Everything is too damn loud, and now Katsuki has to worry about Deku looking at him like some freak? He should have just camped out at the agency, hole up in his office, and see how long this stupid quirk lasts. His ears pin back, and he barely resists the urge to pull his top lip up to flash sharp canines at Deku, feeling like he’s being flayed open by Deku’s wide-eyed gaze.
“U-Uhm! Nothing! Nothing!” Deku squeaks, scrambling to turn around, puff of green curls disappearing as he slumps down the couch, TV channels flicking rapidly till Deku eventually gives up and opens one of the streaming apps they have. Katsuki watches it all from the kitchen entrance, face muddling with anger as he clenches and unclenches his hands, feeling the urge to punch something or tear something apart with his teeth. He can hear Deku shuffling about, blanket shifting, and breath staccato, almost worryingly so.
Katsuki sighs quietly, running his hand over his face, conscious of his nails this time as he sulks into the kitchen, ready to find something to eat and then fuck off to his home office to sift through emails and ignore everything.
-
It’s twenty minutes later, and Katsuki has closed and reopened the fridge four different times because he can’t find something to eat inside. There’s pre-prepped meals, leftovers from takeout last night, and a plethora of ingredients just staring him down, but Katsuki cannot find himself wanting to eat. The pit in his stomach no longer yawns for food; instead, it is filled with irrational nerves and emotions Katsuki does not want to pick apart.
It doesn’t help there's this… smell in the house that’s driving him insane. The AC kicked on ten minutes ago, and suddenly, it was all around him, smelling of sweet honey and sugar, and it is driving Katsuki mad. His nose keeps taking in lungfuls of the smell, ears pricked, and tail swishing lazily as he breathes it in and doesn’t stop. It makes his mind fuzzy, muddled with a singular need to hunt down this smell and devour it. Everything else feels dulled—which, thank fuck for that—save for his sense of smell which is razor-sharp and ready to track down.
Finally, with a huff, Katsuki closes the fridge for the last time, his bottle of water he pulled out of it ten minutes ago dripping condensation all over the counter, but Katsuki doesn’t bother with it. He’s zeroed in on the scent, tilting his head up and dragging in thick lungfuls till all his tastebuds are covered in that sweet-honey taste and his nose has zeroed in on it. It’s a bit harder with the AC going and circulating the air, but Katsuki pushes past that and keeps going till his feet start moving on their own. He walks through their apartment in a daze, poking his head into every room to try and track down the scent. In some places, there’s barely a wisp of it; in others, it’s there, but it’s not the source.
Katsuki ambles through his home, sniffing the air and working his ears back and forth as if it’d help him in the aide of finding this delicious scent. The only thing he can hear is the AC and Deku watching TV. He continues sniffing the air, walking forward till he’s standing right behind Deku, who stinks of the sweet honey scent. Katsuki licks his lips, his hands braced on the back of the couch as he leans down and stuffs his face into Deku’s neck, eliciting a yelp from the nerd, who scrambles and jerks in shock. Katsuki presses his nose deep into the crook of Deku’s neck, inhaling sharply, a growl tumbling from his throat.
“Fuck,” Katsuki mutters, getting lungfuls of that delectable smell as Deku quivers under him, breath hitching and hitting that same staccato rhythm. “You smell so fucking good,” His words are speaking with a throaty growl, pushing himself deeper into Deku’s neck, tongue darting out to lick soft skin and feel the shiver under his tongue.
“A-Ah, Kacchan!” Deku whimpers, face flushing harshly under Katsuki's sharp gaze, eyes going glassy. Katsuki knows that look, that flushed, drippy look that Deku gets whenever he’s aroused. Fuck. Fuck.
Oh.
Katsuki should have recognized that look—that wide-eyed, surprised fish look that Deku gets when he sheds his shirt, comes out of their home gym dripping with sweat and ready to hit the shower, or whenever Katsuki crawls over Deku and whispers sweet nothings into his ears that never fails to get Deku wriggling and willing to take him whenever and wherever. He should have recognized it, but he had been so deep in sensory overload and already snappish that he was blind to the person he knew the best.
“You fucking pervert,” Katsuki snorts, words light and not meaning to bite as he licks another long stripe over Deku’s neck, letting his teeth come into play as they run over Deku’s skin, marking it with twin red lines. “Of course, you’d like it when I sprout fucking dog features,” Katsuki rumbles, snapping his teeth against Deku’s neck, relishing in the high-pitched ‘hnnh–!’ that Deku lets out.
“I-I’m… n-not!” Deku defends himself pathetically, but Katsuki knows. He can smell Deku’s arousal, sickly sweet and hanging in the air, sure to soak into every surface in their house. Katsuk rolls his eyes as he sucks a dark, purpling hickey at the crook in Deku’s neck; something possessive in him stroked at the sight of the mark. He always loves marking up Deku, adding to the canvas already speckled and splattered with moles and freckles, his addition stark against Deku’s pale skin.
“You totally are. Y’know what you smell like to me right now? Honey… I can smell your fucken’ arousal, Deku baby,” Deku jerks with a heavy rolling shiver, mouth cracked open to let out a hungry little keen out into the air, making Katsuki grin sharp and wide. It’s so easy to rile Deku up, especially with the information Katsuki can literally smell his arousal, so there’s no hiding from him.
“P-Please, please,” Deku begs, looking up at him with those wet doe-eyes, looking downright pathetic. Katsuki loves it, loves the way a couple of well-placed licks and taunts makes Deku fall apart. It’s so easy.
He’s so easy.
Katsuki leans back, leaving a messy all-teeth kiss on Deku’s neck before vaulting over the back of the couch, landing in a crouch as he immediately crowds Deku against the sofa, sealing their lips. Katsuki doesn’t hold back, hand coming up to grip Deku’s jaw, pressing two fingers into the hollows of Deku’s cheeks as his teeth gnash with Deku’s, and his tongue fills that sinful little mouth. Deku chokes and keens, eyes falling close and hands scrabbling for purchase as Katsuki devours him, growling in the back of his throat as his hand goes fishing in the crack of their seat cushions for the bottle of lube they keep there. It found its home after they fucked on the couch more times than they can count, and loping to the bedroom for lube kills the mood.
After a moment of looking, he finds the bottle, hooking Deku’s bottom teeth between his teeth as he pulls back, waggling the bottle of lube in Deku’s vision. Deku keens a sound of pure lust, looking at Katsuki as he pants openly against his lips.
“Ass up, baby,” Katsuki grins as he lets go of Deku’s lip, watching as Deku throws the blanket off of himself and slams himself face-down into the couch. It’s at times like these that he has to hold back laughter because Deku is so eager to be a good slut, to hang off his cock and moan so loud that Katsuki has to bury his face into the couch when he fucks him. He knows how to take Deku’s body apart so well he’s useless at keeping his voice down and sounds in. They may be the only ones on the floor—because Katsuki owns it—but he still doesn’t want to take any chances.
Katsuki shuffles around till he’s between Deku’s spread legs, hands on either side of Deku’s hips as he thumbs the waistband of his sweatpants and grins when Deku wiggles impatiently, looking over his shoulder at Katsuki with a pout. Katsuki rolls his eyes and tugs Deku’s sweatpants down, raising a brow when he finds no boxers under them. Deku raises his hips as Katsuki tugs them down his legs, humming when a speckled, hickey-spotted ass comes into view from their last romp, although Katsuki is a bit disappointed to see his bite mark has vanished. Maybe he’ll dig a deeper one into Deku’s ass and finally leave a good scar this time.
“Fuckk, look at that… all for me,” Katsuki growls, licking over the backs of his teeth as his tail wags madly behind him, thumping against the couch cushion. Deku keens a sweet little sound as he threads his thumb over Deku’s hole before rubbing down the expanse of his taint. Deku’s balls squish from where his cock is being pinned against the couch, probably already weeping precum onto the blanket crushed under him. His fingers squish into Deku’s asscheeks, leaving square-shaped divots in his wake as he stares at the angry little marks. There’s a deep-set urge in the back of his mind to lean down and bite, already having been there prior to this whole thing, but now Katsuki feels like it’s about to consume him whole.
“K-Kacchan, don’ tease…” Deku whines, head flopping down as Katsuki bends down to plant a sweet, lazy kiss on Deku’s asscheek, mouth yawning open before he sinks his teeth into Deku’s asscheek. Skin bends and breaks under his sharp teeth, and Katsuki groans at the fresh taste of blood on his heightened senses. Deku’s quivering under him as he licks up the blood, laves saliva all over the fresh bite mark.
“Hngk-! Kacchan! Did you just bite me?! Ow!” Deku blubbers a weak sound as he shivers under his deft tongue, getting nothing more than a lazy, gurgling growl out of Katsuki as he laps at the wound, eyeing the beautiful blossoming bite mark, marking Deku as his. “Possessive…” Deku grumbles as if he doesn’t like it. Katsuki knows he does, because every pore of Deku’s is leeching that sweet honey scent, suffocating Katsuki in a way he’d happily go.
Katsuki licks over his teeth, chasing the hint of blood on them before he pries Deku’s bubbly asscheeks apart, eyeing the way the flesh dents under his fingers, fat and jiggly, and all his. Deku’s hole is there, looking all too inviting, and Katsuki leans down to press a kiss against it before his tongue darts out, feeling too big for his mouth as saliva webs from his teeth from where they press against the soft flesh of Deku’s ass. He’s drooling, he knows he is, and his cock is tenting his pants, throbbing and begging for a warm hole to fuck into.
Deku breathes out a slow, whimpering sigh as Katsuki licks over his rim, chasing that sweet and salty taste that is wholly and utterly Deku, licking deeper and deeper with each pass over.
He’s pushing Deku’s hips down to keep them from wiggling, nose pressing against Deku’s skin as his eyes fall half-lidded, staring at the back dimples Deku has. His tongue finally presses in, spit working into that soft, fuckable hole under him, wetting the way as he groans soft and slow. The vibrations make Deku moan sweetly, fisting the couch cushions and blanket he’s lying on, head dipping low as his shoulders quiver. “O-Oh, k-keep doin’ that…” Deku moans, sweet and beautiful, as Katsuki growls. He has no plans to stop till Deku is dripping his saliva and he’s thoroughly fucked-open just from his tongue.
His tongue scrapes against Deku’s walls, licking as deep as he can as Deku clenches around him. He feels like he’s reaching further into Deku than he usually does, but he’s not complaining. Deku is opening around his tongue beautifully, moaning and writhing under him as he tries to cant his hips up and push back on his tongue. He’s begging under his breath, mumbling in a way that usually Katsuki wouldn’t be able to catch, but when his ears swing forward, the words flow in easily. “O-Oh, god, I can–! Don’t stop, please, don’t stop…” With each drag and swipe, more cries and pleas leave Deku’s mouth, making his chest swell and his tail wag furiously, a dull ‘thump, thump, thump’ sounding behind him.
Katsuki growls as he huffs heavy breaths in and out of his nose, suffocating himself as he eats Deku out with earnest, one-track mind settled on giving Deku the most mind-melting orgasm on his tongue only, and only then, will he split Deku open with his cock, fuck him full of his cum till he’s satisfied. He’s rutting lazily into the couch as he does so, cock shifting against the fabric of his boxers and the couch cushion, providing enough stimulation to keep the urge to jerk himself off down. His hands stay firmly planted on either side of Deku’s ass, squishing the globes in his hands idly as he licks and fucks Deku on his tongue, mouth full of frothing saliva.
“I-I’m! Kacchan! Don’t you dare ssto-p!” Deku sobs, one hand suddenly scrabbing down under his body to press against his belly, sobbing in a way that makes Katsuki’s ears perk up, catching every hitch and break in Deku’s breath as he pushes back against Katsuki’s tongue, moaning loudly. “G-Good boy- Kacchan!” Deku shrieks so loud his ears rapidly pin back, top lip pulling up in a snarl as Deku clamps around his tongue, pulsing and writhing under him as he cums hard. Katsuki chokes a bit, sucking in breath through his nose as he licks Deku through his orgasm, claws digging into his hips and ass as he does so. It’s a bit hard with how hard Deku is squeezing down on his tongue, but Katsuki manages, growls and grunts pooling on the tip of his tongue as Deku cums hard.
Deku shiver and shakes, mumbling ‘good boy, g-good boy’ over and over, and Katsuki is pretending his hind-brain isn’t preening at the praise as he works Deku through his orgasm, huffing in heavy breaths to soothe his burning lungs until Deku finally softens around him, slackens and melts into the couch, breath stuttering and hitching prettily. Katsuki tugs his tongue out slowly, just slow enough to scrape against Deku’s walls and send him shivering and whining high in his throat till his tongue pops out along with a mess of frothy saliva dripping down his tongue like a river.
Katsuki takes in heavy lungfuls of breath, sitting on his calves as his tail whacks the couch cushions loudly, the praise of ‘good boy’ still singing through his mind as he looks at Deku. His boyfriend is completely lax, minute shivers working up and down his body; his face buried in his arms, hiding his flushed face from Katsuki, but he can see the flush on the back of his neck and the tips of his ears.
“Deku,” Katsuki huffs, crawling his way up Deku’s body till his hands are on either side of Deku’s shoulders, Deku’s body completely hidden under him. “Needa’ fuck you right now,” Katsuki says, leaning down to nuzzle into the back of Deku’s neck, kissing there lazily. His tongue licks over the skin he just laved in kisses, listening to Deku whimper, feeling him shiver under him as his head finally tips up. Deku’s dewy-eyed gaze lolls over to him as Katsuki groans, chasing a tear down Deku’s soft cheeks.
“Please… m’so ready for you,” Deku pants openly, hot little puffs passing kiss-swollen lips as his eyelashes flutter. Katsuki groans and rolls his hips downward, pressing his cock against Deku’s asscheeks, breathing in the heady scent Deku exudes. He’s sure he’ll miss this scent when the quirk finally wears off, so Katsuki savors it while he can. His throat bobs as he swallows thickly, watching Deku whine and angle his hips upward, pushing against Katsuki’s rock-hard cock trapped in his sweatpants. “Please?” Deku begs, eyes going half-lidded and bottom lip pushing out into a soft, bouncy pout that Katsuki cannot get enough of. It’s Deku’s signature begging look, whether it be a piece of limited-edition merch or fucking him on the counter he just wiped clean.
Katsuki is completely weak to his, and so is his cock, throbbing and probably staining his boxers so bad he’ll need to toss them.
Katsuki pants heavily, pushing his cock harder against Deku’s ass, rolling lazily as the friction melts his brain. His tail thumps rapidly, and his hips work in slow, tantalizing jerks, mouth dropping open as he pants openly, ears swinging to pick up every single one of Deku’s whimpers and pants, teasing the man under him. Deku’s head tilts until his fringe of curls tickles the bottom of Katsuki’s jaw, and those wide pools of jade stare at Katsuki, pleading. Katsuki opens his jaw, teeth sharp and intimidating as he growls openly, the friction getting the best of him. Suddenly, Deku’s jerking on the collar of his tank top, wrenching him down as he snaps at the air, nose curling and irritation showing as his ears pin back.
“Kacchan. Please,” Deku whispers, sultry and whimpering, tongue darting out to lick his lips as Katsuki zeroes in on the action. There’s a wrapping of arousal in his gut just waiting to unfurl, and Katsuki’s mind starts to zero in on the thought of shoving his cock into Deku’s soft ass, see him stretch around his girth and do nothing but take it. Katsuki groans loud and heavy in the air, walking his hands back till he pushes back to sit on his calves, hand smoothing a path down his abs till his fingers breach his waistband, hooking a thumb between his skin and the elastic of his sweatpants and boxers, pulling them down till his cock flops out, thick and heavy as it twitches and pulses as the cool air nips the shaft. Katsuki hisses at the sudden shift in temperature, a droplet of precum sliding from the crown of his cock to the underside.
Katsuki takes his shaft in hand, the rough grit of his paw-pads making his stomach clench and that ball of pleasure unravel slightly in his gut, teeth clacking together as he relishes in the sensations for a moment. His hands are already rough, but this is a different sensation that makes his head spin, and his eyes threaten to roll up, licking over the backs of his teeth until Deku whines and returns his attention to the man, who has now shoved a pillow under his hips, propping himself up. There’s a pout playing on soft lips that Katsuki wants to lick and kiss away, but he settles for dropping his cock in favor of grabbing the bottle of lip he left to the side, popping the seal with his teeth.
The bottle pops open easily, and Katsuki turns it over, drizzling a good amount on his cock before slathering the extra over Deku’s puckered, red-rimmed hole, still covered in frothy saliva. He’d finger Deku, but with how long his nails are, he has to settle with pressing his cockhead against the small drizzle of lube, shuffling forward till he’s looming over Deku, hands pressing down on soft asscheeks, eyes downward. His ears are rocked forward; brows pinched as the tip of his tongue pushes out of his lips to lick across them as he finally pushes his hips forward.
The tip pushes in slowly, and Katsuki groans at the way Deku’s hole blooms around his cock, taking him perfectly. The stretch is still insane, but Deku hugs him so well, his stomach feeling full of static and his groan dripping off the tip of his tongue. Deku moans sweetly, head dropping as his hands crave purchase, sliding around till they catch on the edges of the couch cushion. “D-Did you get bigger?” Deku whines, pushing his hips back, lube squelching loudly in his ears as he rocks his hips back and forth, working his cock in and out of Deku’s ass as he loosens around him. “Y-Y’feel big,” Deku pants, breathless and airy as he groans as he continues to take Katsuki’s cock, body quivering and walls clenching around him rhythmically.
“Dunno,” Katsuki slurs around a mouthful of teeth and tongue, drool slipping down his chin, the sensations feeling like they've been cranked up to ten. He feels like a livewire, sparking at every sensation as his head grows fuzzy, teeth clacking together mindlessly. They gnash together as his jaw works in intervals as he fucks deeper into Deku’s ass, lube frothing around his cock, leaving a white ring around the base of his cock. “Feel good, Deku baby?” Katsuki pants, licking across his dry lips as his eyes fall half-lidded, lashes fluttering in his vision as he heaves in lungfuls of breath.
“Y-Yeah, so good,” Deku breathes, nodding rapidly as he continues to push back on his slow, deep thrusts and rolls of his hips, ass swallowing his cock like a pro. At this point, Deku should be a pro at taking his cock for how often he begs for it. “I can feel you in my tummy, Kacchan…” Deku breathes heavily, hitching with every jerk of his hips at the information relayed to him. Deku turns his head slightly, a twitchy grin on his face, eyes dripping crystal tears. “Y’re in my tummy, Kacchan,”
Katsuki snarls and snaps his teeth at that, thrusting his hips forward, burying the last few inches in Deku, balls slapping against Deku’s as he sheaths balls deep inside of his boyfriend, who squeals and jerks, mouth working open and close. The smell of salt in the air mixes with the honey; Deku’s tears are so heady in the air that Katsuki can taste it.
Drawing his hips back all the way till only his tip stays inside of Deku, Katsuki fucks forward with a rough snap of his hips punctuated with a sharp growl echoing out from his throat; words lost on him as he zeroes in on one thing: breeding Deku and fucking him full.
His hands scratch at the cushions under him as he fucks down into Deku, balls slapping against Deku’s taint, swinging with each thrust. His tail works rapidly, swinging in semi-circles as he huffs and pants, watching Deku’s every reaction with sharp eyes. His ears are forward, catching every breathy keen Deku lets out, punctuated with every thrust of Katsuki’s powerful hips, the messy clapping and squelching of lube setting his teeth on edge, wishing to sink deep into Deku’s neck, bracket him there and plow into him with reckless abandon. He has to stop himself from doing so, though, because he’s not sure he can hold himself back from doing serious damage, but Deku—his bitch—is blissfully pliant under him, working back against his thrusts in time with them, whining and keening wordless sounds of pleasure. His mouth is open, drooling all over himself, making a mess.
“Grrngh…” Katsuki groans, cock throbbing inside of Deku as he fucks in quickly, couch squeaking and groaning under their actions as Katsuki continues to fuck down into his boyfriend, pressing him down and pinning him under Katsuki. His body feels like an exposed nerve, a way that Katsuki has never felt before. It feels fucking euphoric, though, the way he can feel Deku’s ass squeeze tight around him, trying to milk him for all he’s worth.
“Kacchan! Oh, oh god-! Go-Good boy, please! I’m close!” Deku squeals, writhing under him as he sobs and writhes under him. Katsuki snaps his teeth, face surely pulled into an impressive snarl as the praise of ‘good boy’ races through him; his balls start to string upward, a sensation that he’s never felt before tingling at the bottom of his spine. One of Deku’s hands flies backward, landing on his hip, digging blunt fingernails into Katsuki’s skin, raking down the side of his hip as he fucks into the fuckhole under him. “Please, please, ple-ase! Angh!” Deku’s shout of pleasure makes Katsuki’s back tingle, a bolt of pride racing down his spine as he fucks Deku through his second orgasm, the grin sharp on his face
“Fuck! Fuck, I’m cumming, Ka-cchan!” Deku thrashes under him, but his body keeps him under him and hanging off his cock, unable to do nothing but submit to the pleasure as he paints his bulging tummy white with his own spend, voice cracking under the weight of his sobbed moans of pleasure. Even though Deku is tumbling through his second orgasm, he still pushes his hips back—like a good bitch—making Katsuki tingle in all the best ways.
Katsuki doesn’t stop fucking, doesn’t stop the way his hips swing, and his balls slap against Deku’s, probably painting them red with how hard he’s fucking into Deku. His hands sink deeper into the cushions below them, probably breaking a couple of threads under his nails as he pants, pleasure crashing around his body like a violent sea trapped in a bottle, ready to explode out of him.
His tail swings with each thrust, still attempting to way, but now it just bounces with the motions, brushing against Katsuki’s ankles and feet as the sounds of their fucking echoes in the entire living room, sounding so loud against Katsuki’s ears. Even so, he doesn’t mind it because he can catch every keen and whimper Deku lets out that his normal human ears wouldn’t capture. It makes his chest puff out, licking over his teeth as he sees the fruits of his labor bloom under him—Deku, completely taking apart, sobbing and whimpering as overstimulation hits hard.
Yet, he’s still fucking himself back on Katsuki’s cock, ass clapping against his hips as he chases pleasure, even if it brings him those sharp twinges of pain that Deku loves and hates. His hand is still on Katsuki’s hip, holding strong while his other one is above his head, digging into the cushion for a brace to push back into Katsuki’s thrusts.
Katsuki groans as his cock continues to fuck in and out of the plaint, dripping hole he’s made of Deku’s ass, balls slapping against Deku’s as his cock throbs heavy and visceral, a tingling sensation he’s never felt before, ripping up his spine as he tilts his head up, a bitten-off howl tumbling out of his bobbing throat. “Fu-fuck, Deku!” Katsuki barks, a sharp sound following the words as he breathes hard through his mouth, teeth clenched together hard as his thrusts finally start to lose rhythm.
His hips stutter and his cock feels all weird, but it feels too good, so Katsuki doesn’t even bother trying to figure out why he feels so weird all of a sudden. The only thing racing through his mind is fuck, fuck, breed,breed, and Katsuki doesn’t even try to fight the instincts to sink his cock deep inside of Deku and plumpen his stomach up with pups right here and right now.
“A-Ah, Kacchan?! W-Why are you gettING…!” Deku squeals a sharp sound as his head snaps up, mouth falling open from what Katsuki can see as he finally tips his head back down, nose wiggling as he takes in the beautiful honey smell surrounding him and sinking into his skin as sweat pools at the base of his neck and slides down his back, body feeling like its on fire. He feels like a fuse that’s burning rapidly, and he’s about to fucking blow.
“T-Take it, take it, take it, take it,” Katsuki slurs mindlessly, pressing down harder than before as his hips stutter and work in a tantalizing rhythm, mind turned to fucked-out mush as his orgasm starts to climb up his vertebra, using each as a stepping stone to consume Katsuki whole. He feels like the jar holding him together is about to break, hairline fractures showing themselves in the thin glass as he huffs and barks sharply, teeth snapping at the air, wishing to sink into that inviting neck, but he keeps himself back.
His arms shake with the effort to keep himself up, cock twitching and throbbing, suddenly harder to pull out with his out-thrusts, so Katsuki just pushes in harder, switching out his harsh thrusts for deep, shuddering grinds into Deku’s jiggling ass, jaw dropping open as his tongue lolls open, pleasure so sudden and overwhelming Katsuki doesn’t stop the howl this time, sounding so loud in his own ears as it bounces off the walls and ping-pongs around in his head, hips jerking and stuttering so violently, Katsuki feels just a hair away from exploding.
“O-Oh, oh my ggo-d! Y-Your kn-” Deku doesn’t get to finish his sentence as Katsuki pulls out almost entirely, tip nearly pulling free before he shoves down with all his weight put into this one thrust that’s bound to fuck as deep as possible into Deku and fuck him full of his cum. His cock slides deep inside of Deku, and something at the base of his cock pops in, making the out-thrust impossible, suddenly stuck as he growls into a shaky howl that burns through his throat as he cums so hard he almost blacks out.
His chest heaves violently, vision whiting out like static as it flickers in and out, cock throbbing inside of Deku as he fills his boyfriend—his bitch—full of cum, that tight ball of pleasure unraveling and consuming him whole. The void of pleasure in his core yawns and eats him, gnashes him between sharp teeth, and leaves him shaking and gasping over Deku, head bowed as he collapses to his knees, pulling Deku closer as he tries to regain his breath, but it’s hard when his balls are strung so tight as he dumps every last bit of cum inside of Deku’s ass.
His eyes are finally starting to lose the sun spots and static in the edges as he looks down, dragging his eyes down the expanse of Deku’s body, starting at the freckled back exposed to him thanks to Deku’s rucked-up shirt before making his way down the soft line of Deku’s body to where they’re connected. And fuck is that a—?
“K-Knot…” Deku wheezes, bleary eyes turning to him, ass pressed firmly against his abdomen, shakily reaching through the air to place two fingers on either side of their connection, an upside down ‘v.’ “Y-You knotted me,” Deku keens, sounding utterly delirious and high off of pleasure, a wobbly uptick of his lips telling Katsuki all he needs to know.
Deku’s getting off to this.
Katsuki wheezes out a sharp, hitched groan as he watches Deku’s fingers gently prod the connection, making his knot throb and his core jerk as he continues to cum inside of Deku. The pleasure swimming through his veins is insane, like nothing he’s ever felt before, and Katsuki is hooked. He’s sure he’ll never reach the same high he has now as Deku whines and presses himself back impossibly further, ass swallowing his knot like a goddamn pro.
Katsuki wouldn’t be surprised if he is a pro at this shit; he’s seen Deku’s freaky-deeky dildo collection the nerd thinks he has well-hidden in their shared bedroom. Katsuki is the one who cleans the house, and he’s a bit of a neat freak, and he can thank his father for that. Katsuki cleaned every inch of their home and found some things he’s sure Deku would implode on himself from embarrassment if he told Deku about them being not-so-well hidden.
“H-Haah, shit, fucking shit,” Katsuki mummers, rocking forward slightly, head dipped down as his ears flop uselessly. His whole body feels like the strings connecting to his limbs have been cut, and he’s just a moment away from keeling over and crushing Deku under his weight.
“F-Fry your brain, Kacchan?” Deku pants gently, the hand behind him coming to cover one of Katsuki’s from where it’s settled on Deku’s hips, having probably raked sharp claw marks into pale flesh. Deku rubs over his knuckles gently, licking over his lips as they sit—or lay, in Deku’s position—in silence, nothing but the soft puffs and pants Katsuki lets out permeating the quietness. “M-Mm, feels good… so full of you,” Deku sighs blissfully, that far-away hazy look in his eyes returning tenfold as Katsuki watches. He doesn’t think he has the brain power for words, so he just growls softly, cock giving a valiant twitch at Deku’s words. His hind brain is howling with glee, his tail swishing idly behind him.
Fucked, bred him, bred him so good it howls and barks, yipping like a neurotic dog off its proverbial rocker, but Katsuki likes the thought of fucking Deku full, knotting him, and putting pups inside of him. His teeth clatter and snap the air at the thought, trying to shake them off, but it seems the quirk goes deeper than just canine features, as the clear addition to his cock and the hind-brain coming into play was not something Katsuki had thought to be, y’know, a thing when he got hit by the quirk.
“Don’... fucken’ talk like that…” Katsuki grumbles, trying to ignore the way his body is already rebooting after his mind crashed from the powerful orgasm, and his mind is dead-set on a second round. “Y’r gonna regret it,” Katsuki tried to punctuate his words with a growl, but it bites off into a choked-off sound as Deku squeezes down around his knot, clenching and unclenching like the fucking minx he is.
His cock throbs deep inside Deku, unloading another wave of cum inside of his boyfriend, his mouth dropping open further. “D-Dek-” Katsuki chokes, hunching over his boyfriend as his hips stutter forward, nose shoved deep into the crook of Deku’s neck as he groans loudly, answering Deku’s breathy moan as he starts to fuck the nerd in earnest even though he’s stuck, knot-deep inside of him.
His knot starts to loosen a bit, enough to pop in and out of Deku’s stretched-wide rim, fucking in as he bows over Deku, holding him down with sharp teeth on either side of his neck, a warning and a promise. Katsuki’s hips swing with limited motion, hard and brutal as he does so, cock rock-hard and knot half-full, enough to tug at Deku’s rim, but not enough to lock. The pleasure that was simmering in his blood has been turned up to a boil, his vision full of black spots and static as he grunts and growls in Deku’s ear, huffing in that sweet honey smell as Deku moans unabashedly as he claws at the sofa.
“A-Ah, ye-yes! Please, fuck me! Knot me, Kacchan!” Deku sobs, mindless in his pleas as he lays trapped under Katsuki’s body, thrusts hard and unrelenting as he shoves deep, feeling the cum he just pumped into Deku slide out around his thrusting cock, likely to make a big fucking mess that he’s not going to have a fun time scrubbing out of the cushions later.
“Please, please! Harder, o-oh god, please!” Deku squeals and shivers hard, back bowing and pressing up against his chest, sweat mingling and breath hitching at the same time as Katsuki slides his arms under Deku, grinding his teeth hard when the prominent bulge of Deku’s soft, toned stomach presses against his forearms—a mix of cum and his cock fucking in and out of Deku—as he braces, holding Deku’s body to his. His hips start to swing faster, rutting hard into the pliant body under him, nose taking in deep lungfuls of Deku’s honey-sweet arousal, clouding his eyes as his body tingles and jerks, the urge to knot Deku pounding at the base of his spine, shivers racing up it.
“I-I’m g’una… b-burst–!” Deku keens high and loud in his throat, mouth dropping open as he writhes in Katsuki’s hold, eyes rolling up as tears spill over and slide down his face, catching on Katsuki’s skin. The droplets feel like ice against his red-hot skin, making him groan as he pushes his face harder against Deku’s, starting to lose his rhythm once more. Deku clenches hard around him, squeezing and trying to milk his fast-filling cock as he cums once more, painting his forearms in wet, sticky spend as Katsuki fucks him through his third orgasm of the night.
Katsuki grins shakily against Deku’s kiss, laying kisses at the hinge of Deku’s jaw as he does so, huffing and groaning. “Go…Gonna knot you, Deku baby,” Katsuki slurs, words catching against the backs of his teeth, body shifting and hips rutting harshly against Deku’s soft, jiggling ass. “F-Fuck you full till you’re bursting,” Katsuki breathes, knot starting to tug gently on Deku’s abused rim, catching every other thrust, tail thwapping harshly against the sofa again, ears starting to draw back as the pleasure begins to consume him again. “Y’want that? Hm?” Katsuki taunts, watching Deku nod rapidly even as spit and tears slide down his chin, sobbing gently, probably so deep into overstimulation it’s overwhelming every nerve-ending Deku has.
“Yeah, yeah, god, I want it so bad–” Deku whines, eyes far off and breath soft and airy, “Please, knot me, Kacchan…Wan’ it so bad,” Deku’s keen and tilting of his hips is what does it for Katsuki, a roar bursting from his throat as he pushes his knot in, rutting his hips once, twice, before it shoves in, spreading Deku wide as his orgasm crashes over Katsuki. His toes curl, and his mind completely goes offline, mouth slack and open as he huffs and moans low in the back of his throat, the throes of pleasure wrapping around his throat and choking him till he feels light and dizzy from lack of air, sucking in a breath, and—-when had he stopped breathing?
A soft stroking of his ears slowly brings him back, having collapsed on Deku, pinning him down on the couch and on his knot. Deku’s hand is gradually working gentle lines up and down the edges of his ears, making them twitch gently and perk forward, giving Deku more space to pet. Katsuki doesn’t want to admit it, but fuck, the petting feels nice. He knows his tail is wagging gently behind him; he can feel it knocking against the insides of his legs. He’s always liked having his hair pet, and Deku only does it when Katsuki is sick, and that’s once in a blue moon. Katsuki’s not going to tell Deku that he likes his hair being pet, but he’s sure his head pressing into Deku’s head is cluing Deku into how much Katsuki likes this.
“Mm, back with me, Kacchan?” Deku’s voice is like a balm on his grated nerves, making him nod slowly, still too hazy and fuzzy around the edges to speak. He usually isn’t all that talkative after an orgasm either way, and Deku is typically the one babbling away under his breath while he’s fucked through one. “Maybe two knots in such a short time isn’t too good of an idea,” Deku said, light and playful, making Katsuki roll his eyes and nips Deku’s ear from where his head is nestled on Deku’s shoulder, ignoring the annoyed look Deku sends him.
“Ya think?” Katsuki grumbles, feeling utterly wrung dry of all his energy. “Tell me somethin’ I don’t know,” Katsuki huffs, pushing his head against Deku’s hand harder when it stops, sighing softly when Deku starts stroking the base of his ears gently.
“Is the petting a you thing? Or quirk… dog-boy thing?” Deku hums, making Katsuki glower at him through his slow-falling eyelids. He’s too tired to keep them open, and a nap sounds like a fantastic idea, and his knot is stuck inside of his boyfriend for who knows how long. Katsuki doesn’t respond, but he knows Deku will figure it out either way because he’s obsessed with every weird quirk Katsuki has. His Kacchan notebooks have grown over the years, especially after they started dating. He’s pretty sure Deku has one dedicated to his cleaning habits and routine because Deku doesn’t know a good cleaning routine, even if it was drilled into his brain.
“So it is a Kacchan thing…” Deku giggles, soft and gentle, as he continues to pet Katsuki’s hair and ears, making him huff. “I love you, Kacchan,” Deku mumbles, shifting slightly under him, burrowing deeper into the sofa he’s being pressed down into.
“Love you too,” Katsuki mumbles, one hand petting Deku’s underside gently from where they were tucked under his boyfriend. “G’na… flip to our sides,” Katsuki huffs, rolling to the side and hauling Deku close so it doesn’t tug on the connection till they both flop onto their sides. Deku hums and tosses the pillow under his hips elsewhere, the blanket under them—thankfully having been put over the pillow this time—wholly ruined with cum and lube stains. He’ll deal with it later, sighing into Deku’s hair as Deku wiggles against his back slightly before reaching up and grabbing the TV remote, flipping through the forgotten channels as he finds something to watch.
The background noise is nice, and Katsuki swears he can hear Deku’s heartbeat thundering away soothingly as Katsuki slips into a doze, holding Deku close. Deku just reaches a hand up and pets his ears till he falls deeper into sleep, nuzzling into Deku’s neck, which is still oozing the remnants of that sweet honey smell, but the whiff of ozone and pine—thanks to the nice shampoo and conditioner he finally got Deku to use—comforting to him as he lets himself slip away, knot still stuck in his boyfriend.
When he wakes from his impromptu nap, he’ll clean everything up, including himself and his boyfriend, finally cook lunch—is it dinner now?—and go bother Eijirou to see how long this quirk lasts. Not because he wants it to end, but because now he’ll have to barter his time and see how many times he can knot his boyfriend during that time.
Priorities.