Archive of Our Own

“Hurry the fuck up!” Katsuki hollered from several paces away. Izuku smiles sheepishly at the small group of fans that had, squealing, hailed him down for a few autographs.

“Coming!” He called, biting down on the instinctive ‘Kacchan’ that would normally follow. “Sorry, gotta go!”

“Go save the city!” One girl shouts enthusiastically. The rest gather together and wave.

“I love you!”

“You’re my favorite hero!”

Flushing, Izuku trots to catch up to his Hero partner and secret boyfriend. He’s never going to get used to that sort of praise from the public. He didn’t feel like anyone’s hero, he still had so many favorite heroes himself.

“Had enough flattery for today?” Katsuki grouses, walking with purpose and with that sexy stride he has when he’s wearing his gauntlets. Izuku will admit to following behind him for a little longer than necessary, just to watch.

“Kacchan,” He says lowly, as they resume their patrol. “You know I can’t help that. I want them to like me.”

Hunting a perverted serial quirk user that strikes in the middle of the day, they had finally been called in after the third hero had been targeted. The debrief for this case was mildly embarrassing, as Miruko had been nearly gleeful in telling them what they were facing.

“This guy’s quirk switches the genitals of the person they touch to whatever sex of their choice.” She told them, grinning at Izuku’s immediate blush and Katsuki’s ‘Haaaaaah?!’ “It lasts for about a week so far, but we’re unsure if that’s deliberate or part of the quirk. You’re to hunt him down and arrest him for quirk usage.” Her eyes sparkled with that truly terrifying glint of maniacal enjoyment she got when witnessing their torture. “Hope you don’t get caught…”

Crazy woman. For the #1 Hero for the last three years after Endeavor’s retirement, she never really changed her attitude. Katsuki admired her for it.

“Whatever.” Katsuki grumbles, red eyes sharp, taking in all the dark alleyways they pass and checking the rooftops. Izuku in turn was watching everyone’s faces, taking in the strangers they passed, anybody who looks out of place. Most were on their day-to-day errands, some wore masks, others were rushing somewhere.

“Don’t be jealous,” Izuku murmurs, even as he smiles at a passing stranger’s child who points at them, “I’ll make it up to you later.” It’s low and purred and makes Katsuki’s shoulders bunch. He still gets heady with this power, this ability to make Katsuki (Kacchan, it’s Kacchan!) stutter. Kacchan wants him.

Half a decade later, and Izuku still got giddy with it.

“Slut,” Katsuki rumbles deep in his collar, and it zings right into all of Izuku’s nerves.

“K-K-K-Kacchan!” He squeals, because damn the man for being able to overturn all of his teasing with one word. “We’re in public!”

“So?” Katsuki flicks his eyes over to Izuku and oh they burn.

“So-S-So, don’t say things like that!” Izuku starts to wail, ducking his face into his respirator. He’s about to continue when there’s a loud crash and a woman’s scream up ahead.

Immediately the levity is gone, and determination replaces it. Izuku flicks Katsuki’s shoulder and points up before disappearing in a flash of green lightning, hopping against the buildings to avoid people rushing away from what was likely a villain. Behind him, Katsuki blasted upwards, taking to the sky.

It was a villain, just a regular old villain who had decided to attempt to rob a store. Upon being found out, they’d expanded like a giant bowling ball, and was attempting to flee by running everything over. Izuku got all the civilians he could reach out of the way, leaving the area clear for Katsuki to come in like a missile and flatten the guy to the pavement.

Planting his boots into the man’s back, Katsuki grinned victoriously when all the villain could do was swear, defeated.

Not really a villain. Izuku watched with pursed lips, thinking about it. Just a guy who wanted something for free and who used his quirk to enable it. Not quite villainous in his opinion.

It’s around the time when Katsuki had slapped the man in cuffs, and they were waiting for the nearest police car that he realized he felt…different.

And by different, he meant physiologically.

“Kacchan.” He whispers, filled with horror.

“Hmmn?” Katsuki grunts, bored and irritated for having to wait longer than five minutes. He looks over, and jerks when he sees Izuku clutching at his groin.

“N-nerd, what the fuck are you doing?!”

Izuku’s twitches, wide, wild eyes darting up to stare at him. His face was pale, his body shook. Katsuki was worried, what the fuck, what happened, but…groin…the villain they were hunting…Izuku had just been gathering people up in his arms in twos and threes…

“Did you…” Katsuki whispers, stunned.

“It’s gone.” Izuku says hollowly. He pats at his crotch, over his uniform. “There’s…I have…it’s different!”

“Stop fucking touching it!” Katsuki hisses, looking around, praying for a lack of reporters. Thankfully, it was a small neighborhood, and nobody seemed to be filming. “It looks like you’re touching yourself! Shithead! Stop!”

Stomping over, Katsuki knocks the mans arms off and stands close enough he’s at least somewhat covering his front. He ducks his head close, and glares into green eyes.

“They’re almost here, we can get the fuck out in a moment. Deal with it.”

“Easy for you to say!” Izuku shrills under his breath. “You’re not the one with a…a….a….”

Katsuki wants to tease. He probably shouldn’t, this was a serious situation, and clearly Izuku had touched the man they were hunting at least once in the last half hour, so they might know what he looks like.

“A what?” Katsuki asks, trying for solemnity. Only Izuku would be able to pick up the twitches in his eyebrows and jaw that said he was seconds away form laughing.

Izuku glares, vicious, cheeks a bright red. He hides in his respirator. The cop car drives up, and Katsuki, glad Izuku was no longer petting at himself, turns to hand over the fucker they’d finished in three moves.

“A pussy.” Izuku mumbles behind him, hissing, meant to sap the hilarity out of the situation. But wait. Wait, hold on.

Katsuki feels a familiar rush of heat in his stomach at the very thought. At the word falling from Izuku’s pink lips, a word that they didn’t ever really say, being two men in a gay relationship. Katsuki was very comfortable and sure of his sexuality. So why the hell did that just turn him on? What the fuck. He clears his throat and deals with the cops, while Izuku suffers in the background. One of them asks about his partner, and Katsuki’s in-character glare makes him mind his own business.

“Alright, lets go.” Katsuki grabs onto Izuku’s arm, and then they’re jumping, blasting off into the sky and making quick time to the agency.

Landing on the pad outside Miruko’s office, created for quick exit and entry, Katsuki’s the one to explain the situation while Izuku dies a little inside with the woman’s every snort and chuckle.

“Go get checked out. Write up what you remember of every man woman or child you carried out of the way, that is our likely suspects. Whoever they are, they’ve been targeting people all in the same neighborhood, so it’s likely this is a prank gone too long, or someone with a fetish.” Her smile turns dirty. “From what I hear, since it’s guaranteed over with by the end of the week, consider this an opportunity for a good time.” Her eyebrows wiggle.

“Dirty old hag.” Katsuki growls as he ushers a quickly expiring Izuku out the door.

Her cackles follow them to the elevator.

Izuku suffers in embarrassed silence, one hand drifting over and over in front of his hips, looking for something familiar and finding something else.  

“What does it feel like?” Katsuki asks impulsively, then balks. Green eyes darted to him, pinning him with that intense energy Deku gets now and then.

“Why.” Izuku asks darkly. It wasn’t really a question. More of a demand.

Staring at the closed elevator doors, Katsuki pretends he isn’t sweating.

“Nevermind.” He grunts, as they enter the clinic’s floor. After that, Katsuki is exiled to the hallway while Izuku is taken behind a few curtains and told to…put his feet in the straps?!

“HUH?!” He half-shrieks and suffers for the next two minutes and thirty seconds while the doctor ducks their head under his bedsheet and prods and pokes at his…his...insides!

He dies of shame.

Then he’s being handed over to Katsuki, somewhat traumatized, and told they’re both to go home and take it easy until the quirk lapses. Izuku is not allowed to go back on duty with an altered body, and Katsuki is told, in no uncertain terms, to be kind to him.

“Shut up!” He snarls at the doctor who had before dug out several bullets from his body and kept an eye on his health otherwise. Izuku is shuddering in his arms, so he doesn’t fight very long.

They’re quiet on the walk home.

Izuku escapes to the bathroom immediately to drown himself in a scalding hot shower. Left to fuss in the kitchen, Katsuki fucks around making food, listening to the water run, and tries not to think about what lay between his boyfriend’s thighs.

Except telling himself not to think of it immediately makes him think of it. Fuck!

Stomping to the bathroom, Katsuki slams the door open, ripping the curtain aside and finds Izuku leaning against the shower wall, one leg up on the tub ledge. Both of his hands were down at his…his groin…where…where there wasn’t a cock.

Katsuki was fond of that cock. Knew it by heart, even. But it wasn’t there.

In its place lay a pink valley, a fuzz of dark hair, delicate looking lips laying between two large puffy ones, and a dark entry, a hint of where it goes inside in a way that was completely foreign. Drenched in the shower water, Izuku looked like he had been investigating, biting his bottom lip, cheeks pink.

“Kacchan!” Izuku wails, covering his cunt with both hands, crouching over it to hide.

“Izuku.” Katsuki groans, unable to even pretend. It interrupts the other’s embarrassed spiral. “Fuck. Fuck! What the fuck!” He steps forward, then kneels at the tub side, reaching in uncaring that his shirt was getting wet from the shower.

“K-Kacchan?” Izuku stutters, even as his hips are grasped and he’s tugged, urged forward.

“Let me see.” Katsuki rasps, needy, utterly thrown out of his normal confidence from the very fucking thought that Izuku…that his boyfriend, his one fucking true fucking love, had--a cunt. A cunt.

This was fucking with his brain. And weirdly, it crossed a few wires, and he was hard as a fucking rock.

“Kacchan,” Izuku warns, even as Katsuki starts to tug at his wrists, “It’s…it’s weird, I feel…I feel weird.”

He looks up his body, at the flat pecs, the unchanged muscles. The quirk only affected his genitals. Meeting green eyes, Katsuki tries his best to be kind. Izuku was always telling him to pay more attention, to be gentler when things were more serious. Now seemed pretty serious.

“It’s still you.” He says, staring into beautiful eyes. “I’m...I want. This is fucked up but I want to see, Deku, I want…”

“But…you’re gay?” Izuku says in overwhelmed confusion, breathing slowing down from the frantic bunny-fear it had been when Katsuki burst in. “You said you hated the thought…”

“I was sixteen and an asshole.” Katsuki deadpans back, fingers clutching on wrist bones that felt breakable but were likely harder than steel now. “You're still a man, we're both still gay, you just got...a new. A--I don’t fucking care, and it’s…temporary. And.” He's stumbling over his words. he doesn't know what to call it. What this whole change has awoken within him. 

“And?” Izuku asks, eyes darting now, expression turning contemplative, interested, scientific. Fuck, he’s sparked his analytical interest. Now Katsuki couldn’t get out of it. The water ran in the background, but it felt humid in here for different reasons.

“And I want to see.” He growls, hotly, eyes burning. Izuku shivers, and now, finally, his hard as rock arms start drifting where Katsuki was tugging them, pulling away from his center, from his new…his…

A pussy. The whole vulva, all of it. Pink and swollen, perhaps from the heat of the water, perhaps due to Izuku touching it.

“Were you…” Katsuki swallows, as his eyes devour. Izuku whines, high pitched, uncertain, because Katsuki was staring at his most private place and it wasn’t even his cock—“were you touching yourself?”

“Yes.” Izuku whimpers, as Katsuki’s hands go to his thighs to urge them apart a bit. It makes his lips spread, and a gust of air leaves Katsuki. “It’s…it’s sensitive. Really, like, more than…”

“More than your dick?” Katsuki breathes. He’s getting closer, he wants to…he can smell it, the difference, even under the water washing it all away.

“Yeah…” Izuku shivers, one hand going to Katsuki’s forehead, but just laying there, not pushing him off.

“God, what the fuck.” Katsuki says to himself, even as he shoulders Izuku’s one leg up and apart, big hands traveling to frame the new addition.

“Why are you saying that I should be saying that it’s my body!” Izuku cries, leg trembling in Katsuki’s hold. “The doctor even had to look inside, do you know how unnerving that was? It’s a, a, a whole new hole!” He slaps a hand over his mouth after saying it, eyes wide.

Katsuki feels kind of bad for being so turned on while his boyfriend was having some kind of internal crisis. But really. He’s kind of drowning in lust right now. And the thought that there was someone inside his boyfriends’ new entrance and it hadn’t been him really pissed him off.

“Yeah.” He rasps, ducking forward against Izuku’s fluttered pushing. His nose brushes damp hair, and he sniffs, audibly, mouth dropping open like he can taste the air with his tongue like a snake. It feels close in a way a cock doesn’t, like there’s something to enter, not something jutting outwards. So different. Wildly different. “Yeah, and I wanna fuck it.”

“K-atsuki!” Izuku shrieks, shuddering under his palms. There’s a weird rush of heat, and Katsuki realizes its coming from the cunt in front of his face. Under his very eyes he watches as parts of it flex, relax, and they’re chubbier than before.

Fuck. Fuck, what the fuck?!

“Oh my god, please, stop!” Izuku wails, covering his face, and Katsuki is immediately letting him go.

“Right.” He swallows tightly, standing and ignoring his own rock-hard cock in favor of stepping inside the shower, fully clothed, to bring Izuku into his arms. “Sorry. Sorry.”

Izuku pants against his shoulder, accepting the cuddle, shivering. The water’s too hot, it’s sweltering. So Katsuki uses his socked foot to turn the tap off, and then is gently urging his boyfriend out to wrapped up in a soft towel. Izuku is snuffling, covering his face, and Katsuki feels a familiar kick in his gut.

“Sorry.” He grunts again, kissing the top of that green hair.

“It’s okay, I got overwhelmed.” Izuku whispers, one scarred hand gripping his wet t-shirt. Here Katsuki was, standing in soaked clothes in the bathroom, cuddling his burritoed boyfriend to his chest.

“I made food.” He says in response, dragging his lips over Izuku’ cheek. And they pretend that Katsuki wasn’t nearly bursting out of his jeans and Izuku didn’t have a new hole in his body that wasn’t an open wound. After getting them dry, he feeds Izuku, who wraps himself in Katsuki’s clothes. Despite being built like a fucking freight train, Izuku hadn’t quite grown any taller since they’d turned eighteen, unlike Katsuki who hit some kind of second puberty around twenty.

Taller, broader, and heavier than Izuku, Katsuki wasn’t nearly as flexible as he had been at sixteen. Not like Deku, who could bend and leap and twist as needed, now Katsuki had to lug around an extra fifty pounds of muscle mass. The secondary growth left him a sold six inches taller than his boyfriend, shoulders broad and thick because of the use of his quirk, so the large black sweatshirt Izuku wore now hung on his frame like a pillowcase. He was pouting around his food, deliberating the new changes, wrapped up nice and warm and comfy in Katsuki’s clothing.

It was cute. And attractive.

Doing the dishes allowed Katsuki some time to think, as Izuku curled up on the couch and put on his favorite comfort film – All Might documentary # 6 of course – and it let him make a few decisions.

Collapsing on the couch and throwing his feet up and over into Izuku’s lap, Katsuki levels his gaze at him. Looking at least a bit more relaxed, Izuku accepted them and wrapped his scarred hands around Katsuki’s ankles. His thumbs moving absently, Izuku blushes and weakly smiles at him.

“I feel better, thank you for dinner Kacchan.” He says shyly. Katsuki couldn’t really understand how he was still so shy after an entire lifetime together. Still so shy, even after being fucked unconscious by Katsuki, or fucking Katsuki until he’d whimpered and cried (a rare occasion, but so very worth it).  

“Hm.” He answers. Kicking at Izuku’s belly, Katsuki continues. “My bad for earlier. I know its new. But it’s only temporary, right?”

“Yeah, every target only ended up lasting seven days with the change.” Izuku sighs, digging a bit a the arch of Katsuki’s foot. “It’s just…a lot to get used to. But.” Here his cheeks flush. “Despite it all, I did like what you…what we were doing in the…shower.”

“Yeah?” Katsuki answers, voice warm and thick.

“Yeah.” Izuku bites his lower lip and looks at him in a coy side glance. “I did say I’d make it up to you.”

“Sure?” He’s on edge again, the arousal that had been sitting quietly in his gut coming back in full force. “We can give it some time.”

“Seven days worth of something new. And I want to know why you seem so into it.” Izuku narrows his eyes at him mischievously. “You’re really into it, Kacchan, huh? You like that I have a pussy now? A pussy that’s entirely a virgin?” His cheeks are pink, but it doesn’t stop his flood of words. “The doctor said there’s a uterus and everything, but I’m…in-infertile.” A bit of that wild I-can’t-believe-this comes back to his expression, but it’s coupled with a shift of his hips that clearly rubs in a way that’s entirely new. His breathing picks up.

Devouring every change in his boyfriend, Katsuki shifts his foot and puts his heel where a cock would normally be. There’s no pressing lump like he’s used to.

“I’m super fucking gay.” He answers, unashamed, also mildly baffled by his own reactions. “Maybe cause it’s you, but it’s fucking…hot. It’s another part of you that I can make mine.” His following grin is dark, and mean, and it makes Izuku shiver in anticipation and flattery.  

“You’ve never even touched a- a pussy, Kacchan,” Izuku teases, “Do you think you can manage it?” His eyebrow flicks in challenge.

“Oh, I think I can fucking manage it.” Katsuki growls, prowling forward to press Izuku into the couch arm. The green haired man giggles, sweet and innocent and incongruent with the blocky muscle of his body. “We’re gonna find out how slutty your pussy is, baby.” He rumbles against Izuku’s ear, enjoying how scarred hands clutch at his large shoulders, loving how he can so completely cover his boyfriend.

“Kacchan,” Izuku breathes, kissing sweetly at his cheekbone and ear. His hands crawl to his back, digging fingertips in and dragging and oh fuck, Katsuki hard as a rock again. “It’s so hot.”

“What’s hot?” Katsuki mouths his way over freckled cheeks to his mouth, kissing him, licking across his lips.  

“My…my…my pussy. It’s getting so hot, like its burning.” Izuku whispers, voice shaking a little, twitching restlessly.

“Fuck…” Katsuki grunts, one large hand starting at his strong chest and trailing over his abs, tugging on the sweatshirt, dragging over his abdomen. He’s playing around the hem of his sweatpants, before taking the initiative during another long, distracting kiss, slipping his hand underneath it and the briefs beneath. He hesitates just slightly at the odd sensation of nothing, of not running into the root of a beautiful cock and instead discovering a patch of hair, soft, soft skin, heat, and wetness.

 “You’re wet.” He whispers, stunned and aroused by turns, fingers dancing over the lips, unsure, he feels too large to be touching something so delicate. He felt clumsy, like he was seventeen again and kissing Izuku behind the school, hands hot and jerky on untouched skin.

“Kacchan, oh my god.” Izuku whines against his mouth, yanking on Katsuki’s shirt.

“What does it feel like?” He asks, dumfounded, drawing away to pant hotly against his face, staring at the expressions flicker over a pink face.

“Hot, sensitive…every, every touch feels like its touching me everywhere.” Izuku licks his lips and blinks his eyes open to stare at Katsuki like he’s a fucking god.

Okay, that’s it.

Katsuki stands, abruptly leaving Izuku’s pants despite the other’s whine. Leaning down, he plucks his sexy boyfriend up off the couch like he doesn’t weigh 180 pounds. Thrown over a bulky shoulder, Izuku laughs breathlessly into his shirt, clutching where he can. His boyfriend’s size never failed to turn him into a mess, it was stupidly arousing that Katsuki was still so much larger than him, larger than life.

He’s dropped on their bed and Katsuki fusses, closing the bedroom door, flicking their curtains to cover half the window, getting out the lube like he always does. It’s endearing, and normal, and makes Izuku feel so much more at ease, even with new parts. Watching Katsuki putter about, Izuku lays on the bed and puts a curious hand down his own pants, to cup his sex. It’s hot. It’s tender, and the wetness is entirely new, entirely different. He feels…weirdly sexy at the same time as weirdly off.

Glancing, Katsuki growls at the sight, standing tall and strong at the edge of the bed, hotly devouring Izuku with his gaze. Big and tall and scarred, Katsuki strips himself of his shirt slowly, letting Izuku watch. It’s spellbinding. Then he unzips his trousers, stepping out of them to be naked, cock standing large and proud and ready.

“Kacchan,” Izuku sighs, twitching his fingers at his cunt to play with the wetness, nervous and unsure, rubbing felt almost too much. “Is that for me?” He smiles, eyes taking in the red hotness of the heat, the vein on the bottom, and the cute little mole that sat at the base next to the pale hair.

“You fucking bet it is.” Katsuki growls, putting a knee to the bed and leaning, taking hold of Izuku’s arm and tugging it out of his pants, ignoring his whine. He strips the sweatshirt off, then starts tugging on the pants, drawing them down over his cut hips, then his thighs.

Izuku’s nervous, suddenly, but lets him. As his fresh wet cunt is displayed, Katsuki lets out a gut-punch kind of noise.

“Can I taste it?” He asks, eyes fixed.

“Yeah,” Izuku replies, trembling, hands in fists up at the pillow to keep from covering himself up, “But kiss me a bit first?”

“Yeah,” Katsuki says, falling over him like a tree. Izuku’s legs part naturally to cradle his boyfriend, and they kiss until their lips are numb.

Letting his hips fall heavy, Katsuki’s cock lays against Izuku’s abdomen, and his balls brush over the mound of his new pussy. It’s a brush of skin, but its new and makes them both moan. Drawing himself downwards, Katsuki tastes Izuku everywhere, leaving nips and bites and suckles behind him. Jerking with each move, Izuku is burning, trembling against the pillows and lost in pleasure, just the way Katsuki likes him.

His chin brushes over the pelvic bone, and Katsuki can smell his arousal. Fuck. Fuck, this was a cunt, Izuku’s cunt.

“Holy fuck.” He whispers into delicate skin, lips brushing against the crease of thigh and groin. “Deku, you good?”

“Yes!” Izuku half-yells, legs jerking, hips pumping upwards and all it does is get Katsuki’s face right there, and he falls into it with a muttered groan.

The first touch of his mouth to Izuku’s most sensitive new parts, makes Izuku squeal and jerk away.

“Oh my god, Kacchan, holy shit, holy fuck, Kacchan, careful, slow, slow, please!” Izuku is mumbling, hands grasping at blonde hair.  Katsuki, trying vainly to listen and not lose himself in the blood rushing through his head and into his cock, moans into his lips, kissing.

Sticking out his tongue he licks tentatively, finding the lines and following them. Fingers gently prying Izuku apart, he can stare, wide eyed, at the way his hot, wet flesh is so pink, swollen with arousal, and beyond it, Izuku’s pink, aroused face, dazed and drunk on Katsuki’s every move. He licks, continuously, finding each new line, moving the hair out of the way to stare, and finding the nub at the top. The clitoris. Katsuki knew only the barest anatomical knowledge of it.

He licks, flat tongued, right up the middle, the tip of his tongue skimming over the hole he wasn’t ready to address quite yet. Izuku bodily jackknifes.

Taking it all in, in the way his chest is pounding, Katsuki does it again, but curls his tongue around the clit a bit more, sucking only slightly.

Izuku jerks again, squealing, hands clenching tight enough it hurts on his skull.

“Fuck! How do women handle this?!” He’s bleary eyed and sweating. “It’s so much!”

“What is?” Katsuki asks, desperate to know. He licks around again, wetting everything with his spit as well as Izuku’s natural wetness. It tastes…tart, slightly thicker than water, but he got more used to it with very pass. He nudges his thick fingers over the lips, pushing them, lightly touching where the hole lead into his vagina. His fingers look far too large next to it all, he felt he might break Izuku in some way.

“Just, the,” Izuku heaves in air, dragging his head up to look down at him. “Touching around is, very nice, but touching the, the clit directly is like, like, having ten cock heads all in one place. It almost…hurts.”

“It hurts?” Katsuki’s head pops up, mouth wet with slick. Izuku stares at him and feels again another clench in his belly that’s both familiar and unfamiliar. If he had his cock, it would have flexed, but instead something inside tightens.

“Not, not quite. Just don’t uh, don’t use the same kind of suction that you would with my, my dick, okay?” Izuku smiles at him, shakily, and Katsuki nods, swallowing his excess saliva and the slick in his mouth.

He licks again, trying for gentle, and earns a shaking pleasured sigh and a pet to his face. This was…mesmerizing. Like a repetitive puzzle, trying to find the right pleasure, the right angle.

His fingers twitch a bit, and the tip of his middle finds the hole and prods. Izuku makes an alarmed noise, so Katsuki licks like he seemed to like it, gentle and round, brushing over the lips and the clit but not directly on it.

“Ohh, Kacchan,” Izuku moans, full throated, legs falling apart, “Like that, do it like that.”

Shit, what had he just been doing? Slow, careful, circle. He does it again, and Izuku head flops to the side. He does it again, and again, and again, and god, his tongue is going to fall off. But then Izuku’s hips were moving, working against his face, urging his cunt up to take more of it, the hand on the back of his skull pushes to bring him closer, and Izuku’s voice was rising.

“I think, I think I can come on that, Kacchan, f-f-faster!” Izuku cries, jerking, hips humping harder to somewhat take him, and god, Katsuki was going to drown down here. He doesn’t stop, despite the way his jaw was locking up and the way he couldn’t really breathe very clearly. Izuku was so close it seemed, even as he jerked and twitched and made little noises that made Katsuki worried he was going to hurt him.

Then the thighs flex around his head, trapping him, slamming his mouth down over the cunt, pelvic bone grinding against his face roughly. Those legs had destroyed whole buildings before, and now they clutched his head in their grip. Is it wrong that it makes him more aroused? Alarmed, Katsuki’s eyes pop open and he gets to watch as a ripple crawls its way over Izuku’s body, as he flexes his back almost off the bed, and shrieks.

“Coming! Ho-fu-Kaaaaaa!” Izuku jerks, legs vibrating around his ears, and yeah, Katsuki can’t breathe, but his tongue continues to move, because as he does so, Izuku’s eyes are rolling back and he’s tearing at his head, body flailing like he was being electrocuted. It was a lot. He seems to melt, relaxing, and Katsuki accidently sucks a little too hard.

He’s batted over the head with a flat hand, three times, as Izuku whimpers. It’s kind of like how a cat swats at a dog that gets too close.

“Kacchan,” Izuku blubbers, and oh, he’s near tears. “Oh my god...”

Gasping in air, Katsuki kneels upwards, so hard it hurt, and stares down at his boyfriend who looks utterly fucking wrecked. Pride fills him, as does minor concern.

“Deku,” He rasps, panting, edged beyond belief, “holy fuck, Deku.”

Izuku lay stunned, arms flailed outwards, panting like he’d just run a race. He drags his eyes to Katsuki, who crouches over him, cock a sweltering dark red, nearly purple with it. He’s looking at Katsuki in a way he rarely, maybe never has before.

“I love you,” he whispers, drunk on it, “I think you just made me see god.”

“Fuck yeah,” Katsuki groans, hand reaching for his own cock, he needs to come, he needs to.

“Come on me,” Izuku pleads, wanting it, more than anything, “Come on my p-pussy.”

“Fuck!” Katsuki grips himself, tugging twice, and then shudders, spurting outwards all over Izuku’s inner thighs and yes, over his cunt, white spattering onto skin. The orgasm briefly takes his sight away, setting his hair on end.

“Holy shit.” Katsuki says when he comes back to life, laid out next to the comatose Izuku. They’re barely even touching, Izuku had just thrown his ankle over Katsuki’s; they were too fucking sweaty to cuddle, and oversensitive besides.

“Yeah.” Izuku answers, he’s got an odd look on his face.

“What?” Katsuki flicks his bare hip.

“I’m…throbbing.” He answers, perplexed. Katsuki lifts his head to look down at the pussy he just suffocated himself in. It was swollen, the lips were together but shiny, and the skin was red.

“Bad, or good?”

“Good.” Izuku turns his head, something new in his eyes. It sends chills up Katsuki’s spine, and his gut clenches again with heat. “Real good. Like. I want something…inside.”

“Yeah?” Katsuki licks his lips.

Izuku rolls onto his side and throws a coy leg over Katsuki’s thighs, it spread his cunt against his leg, transferring wetness and heat and oh yeah, Katsuki’s ready to go again.

They kiss, making out, heavily petting in a way that was reminiscent of their first years together, young and unpracticed and greedy for it. They were still greedy, but it came with the certainty that the other would always be there. Katsuki’s hands drift down to thick hips and clench hard, large fingers wrapping over the bones and making Izuku hum against his mouth.

He lets his left-hand drift, touching over fresh tender lips. Izuku twitches with overstimulation, but it’s a weird kind of addicting. Like he was getting hungrier, despite having come only minutes ago. Katsuki’s cock lay half hard and working on thickening, but Izuku felt like he could go again immediately.

“Oh my god.” He whines into Katsuki’s mouth, as fingers part his lips and drag down the center, over his trembling hole. “Kacchan, fuck me.” Oh, he didn’t mean to say that.

 “Fuck, Deku, is it good?” Katsuki pants, licking, biting against his lip. His middle finger pressed, curling, finding the hole and gently, gently, working its way inside.

It’s a close fit, soft, sucking. It was certainly different than his ass, which Katsuki knew probably by heart. His finger curled, Katsuki works it carefully, ouching, feeling, and Izuku is shuddering in his arms.

“How’sit, baby?” Katsuki says against his mouth, not quite kissing, eyes half lidded. Izuku is focused, face scrunched, but his legs remain open, latched up over Katsuki’s hip to let him have room. It’s a bit awkward, but Katsuki makes do. “How’s it feel?”

“Weird!” Izuku answers, then laughs a bit breathlessly. “But weirdly good, too. You’re inside me, but in a way you’ve never been before.” His eyes open and strike Katsuki dumb. Watery and hot, the pupil large, Izuku licks his lips and nips Katsuki’s bottom lip, humping his hips forward to urge more. “Try putting another in. Work it in, it doesn’t just stretch.”

“I know how to finger my boyfriend, fuckhead.” Katsuki growls, leaning to snap his teeth into his neck. Izuku moans, as another fingertip prods, gathering wetness, working carefully in just like Izuku said. It’s an odd tenseness inside, rubbery, but it gradually opens the more Katsuki pays attention, the more he kisses Izuku, the more he crowds him backwards to take his place overtop him. It’s hot, and a great angle, as the heel of his hand rubs over the bridge of his pelvic bone, brushing the clitoris.

It was hugely different from an asshole, and he can only dream about being inside. It’s weird too, because he’d never in his life wanted to be inside a vagina.

Now, here he was with the love of his life, with Deku, and biting at the bit to get inside.

Izuku has hold of his wrist, perhaps just to hold because he’s not holding him back. But he’s humping, head rolling on the mattress (the pillows long discarded from his flailing and pushing), getting so into it again Katsuki felt like a sex toy. He’s not going to admit to himself how hot he found that.

“Oi, another?” Katsuki asks heatedly, balancing on an elbow and already starting to add another finger.

“Lube me?” Izuku asks, licking his lips and working in air. “Is that weird? I should be wetter, but the feeling is…”

“Course.” Katsuki reaches, shuffling about, draining half the tube over his fingers to the sound of Izuku’s laughter.

“Not that much!” Izuku grins, squeaking when Katsuki rubs his fingers, now drenched and sticky, all against his lips. “It’s cold!” He jerks, but the next slide of fingers, three this time, is new and better and oh god.   

“Kacchan.” Izuku breathes, staring somewhat through Katsuki’s face, “Kacchan, fuck me.”

“For real?” Katsuki grunts, panting, other hand on his cock, fingers delving deep into Izuku and discovering new places. “Fuck, baby, for real? Want me to fuck your pretty cunt? My pretty pussy?”

The dirty words roll right over Izuku’s body, making him shudder.

“Y-Yeah…”

Katsuki puffs out air, dives down to kiss him but its messy. That doesn’t stop Izuku from moaning, shivering when the movement pushes the fingers about inside him (inside, in a manner he’s never, ever felt before).

Katsuki smears the excess of lube onto his cock and kneels himself up, shoving space for himself between Izuku’s legs. It’s a familiar position, and he leans down to grind himself over the other, but the way Izuku was jerking, shivering at the brush of his cock over his cunt was foreign.

“Deku,” Katsuki grunts, leaning on one elbow and guiding himself forward with his other hand.

“Kacchan, baby,” Izuku breathes, as he’s spread open on a cockhead he knew by heart.

The angle is different. It’s making everything feel so strange, so new. The shape of Izuku’s hips were subtly different, Katsuki notices, as he holds them, as he enters him, works his head into the lips and pushing into the wet, soft space waiting for him.

“Oh my god, you’re big,” Izuku moans, legs widening, like it will help Katsuki get inside, “Have you always been this big? You feel huge, oh god, you’re big…”

“Deku, if you keep talking like that, I’m gonna fucking burst.” Katsuki grits out between his teeth.

“Hmmm, my Kacchan,” Izuku purrs this time, latching onto Katsuki’s pleasure with single minded devotion. “Stretching me out so well, you like being told you’re doing good? That I can’t really think with your cock inside me? That ohh…” His eyes cross when Katsuki grits his teeth and draws back only to fuck forward a bit, moving deeper, “…ohhhh, that I can’t think of anything else other than your cock.” He says it dreamily. He doesn’t seem to be in pain, even as his insides stretch and change and the newness of it, the difference, the having a cunt, having a cock in his cunt, having Katsuki above him and entering him somewhere that’s never been before is…is…god it’s overwhelming.

Katsuki, for his part, was going insane. He likes being larger than Izuku. He likes being praised. He likes both those things together. And coupled with the tight clench of Izuku’s beautiful wet pussy on his cock is incredible. He’s on the verge of busting right now.

“It doesn’t hurt,” Izuku muses, unfairly clear headed, “it’s just kind of like…pressure. Lots of pressure. I feel…” He gasps as Katsuki jerks, pushing further, drawing back into a tiny, tiny rock that’s meant to get him deeper. “Oh, I feel like you’re up in my chest, oh, fuck, Kacchan…” One of his hands drifts down, instinctual, finding his clit and working it gently, awkwardly, his body knowing what it wants but logically never had to do it before.

“Fuck, baby,” Kacchan hunches down over him to kiss, licking over lips. “That’s right, make yourself feel good.” Izuku whimpers in response.

Starting his hips moving, utterly drowning in the soft wet feeling, an ass wasn’t the same (different, no worse, just different), Katsuki watches through lidded eyes as Izuku is overwhelmed by the new sensations. Katsuki hooks one thick, strong leg over an arm and pulls, opening Izuku further. It’s so new, so different.

 “Holy fuck, I’m fucking your pussy,” Katsuki groans, rearing upwards so he can work his hips and start really slapping his way inside. It’s so good. It’s so good.

Izuku squeals, twitching, hand beginning to really fly over his clit, eyes rolling and mouth dropping open.

“Wait, are you—” Katsuki starts, but is interrupted by Izuku bucking, squealing and then gasping in air to hold it, legs trembling, unoccupied hand flying to grasp at the mattress like he doesn’t know what to do. The clutch around Katsuki’s cock gets incredibly tight, flexing, working around him like a living sleeve and holy fuck, holy fuck, yes, yes—

Izuku’s coming on his cock, trembling all around, and really, Katsuki couldn’t help it. He falls forward, head hanging, and fucks, harsh, fast, splashing into Izuku with a wet slucking sound on every pass. Izuku groans, gasping, legs twitching in aftershock and then Katsuki’s coming with a bitten off groan, unable to help it.

It’s wet, wetter, oh fuck he just came in a pussy, in Izuku’s pussy.

“Holy shit, holy shit, Deku, fuck, baby, Izuku, that’s your cunt, I just came in…in…”

“Inside, I can kinda feel it,” Izuku whined, reaching out for Katsuki, shivering.

Taking him into his arms, Katsuki very carefully pulls himself out amid whimpers, checking on the cunt to see, where it was red and puffy and drenched in sticky lube and slick and, even a trickle of white that was Katsuki – but nothing seemed harmed.

Breathing out roughly, Katsuki collapses, tugging, bringing Izuku in to shiver against his chest, nose poking at his neck.

“Fuck, Deku, that was…that was fucking good.” Katsuki pets a hand into green hair. They’re both sticky and wet they’re gonna need another shower. “You good, was that?” He can’t even think in sentences.

“Yeah, I’m good. I feel, god, I feel good, but also completely fucked.” Izuku smiles blearily, putting lips to Katsuki’s collarbone. Slumping, Katsuki focuses on breathing, working his way down from that intense orgasm.

Laying in silence for a while, at least until Izuku starts to shift, wiggling.

“This leaking is very strange; I’m not used to it.” Izuku stretches, then blanches. “There’s no stopping it. Oh my god.” He crabs himself off the bed and wobbles to the bathroom, leaving Katsuki behind to snicker at him.

Katsuki lays in bed and stares at the ceiling, enjoying the residual heat in his limbs and gut. Well, there it was. He’d fucked Izuku’s pussy.

He’s gonna fuck it as much as possible in the next seven days.

“Oh my god!” Izuku shrieks from the bathroom, “Peeing is so hard to do with this, this… equipment!”

Breaking into more snickers, Katsuki rolls off their bed and heads to join him.

True to his word, Katsuki fucks Izuku again the next morning, rolling him onto his belly and hitching his hips up in a beautiful curve to fuck into him, hitting something inside that turned Izuku into a crying mess (good crying). Then he ate him out again, kneeling at the side of the bed. Then Izuku yanks him bodily up, whirls around, plants his cunt onto Katsuki’s face, and then sucks his cock like a vacuum. Fuck that was hot.

“Kacchan,” Izuku whispers in the middle of the week, “I want to try something tomorrow.”

Katsuki is immediately awake. Every time Izuku has ever said those little words, it meant Katsuki would eventually have the orgasm of his life.

“Yeah?” He rumbles, trying not to seem too eager.

“You know how we play around with me being yours? Yours to fuck?” Izuku whispers, breath lightly fanning over his shoulder. It’s unfairly attractive. “I want tomorrow to be that I want to be your...cocksleeve. Fuck any part of me, anywhere, at any time. You don’t have to ask me if I’m good, just…make me.”

“Fuck.” Katsuki breathes, eyes wide.

“Don’t worry!” Izuku starts before he can, rustling in bed to get closer, laying against Katsuki. “If I want it to stop, I’ll use my quirk and say Red, like we do with the big things. But. I think I…really want it. Don’t even touch me to get me off, just get yourself off. Especially since there’s so many holes that you can fuck me in right now, I…” He must be blushing, hard, because he shoves his face into the pillow and his next words are muffled. “I want to ache with you all over.”

“Okay. I’m down. I’ll start when we leave the bedroom and stop when we go to bed.” Katsuki swallows, already chubbing (impossible, he had like, three orgasms today). “Holy fuck, you pervert.”

Izuku giggles, embarrassed, but his hand skims its way over his abs to brush the growing lump in his boxers. “I’m not the only one.”

If Katsuki felt hesitant at all about their plan for the day, Izuku couldn’t tell.

So, when they woke up, kissed sweetly for a few minutes, and Izuku went to the shower, he had just enough time to get himself clean and ready before Katsuki nonchalantly strolls in, climbs into the shower, shoves Izuku to his knees, and puts his cock in his mouth.

Sucking, Izuku peers up through the water spray to find Katsuki going about his normal shower business, washing his hair, body wash and everything. Protecting the cock he laved over from soap, Izuku moans high and reedy when, coming, Katsuki groans loud, spurts into his mouth, then draws away, finishes washing himself, and leaves the shower. Left kneeling on the shower bottom, Izuku licks his stinging lips and groans, hands fluttering. He’s so turned on, but he doesn’t even want to touch himself.

This was good, oh god, this was going to be so good!

Eating breakfast normally, Izuku ignores the burning in his cunt, the tight, hot, swollen feeling that told him he was aroused (and hidden from the world, that’s an interesting aspect, no bulge to see). They go for a run, racing each other, laughing normally.

“Do you think we should give anybody a call?” Izuku asks Katsuki as they return home. The blonde closes and locks the door as Izuku bends over to untie his running shoes. “We haven’t really heard from anyone since the uh…incident.”

He’s about to continue, when Katsuki comes up behind him and clasps his hips in his hands, shoving his hard cock against the swells of his ass. Gasping, because his head is hung low, he’s sweaty, Izuku feels a sudden huge rush of blood collect at his pussy and gets dizzy with it.

“Nah, I told them all to leave us alone.” Katsuki answers him, voice relaxed and chill, like he wasn’t pushing Izuku’s bottoms down and putting his weight on him, sending him to his hands and knees.

Katsuki doesn’t even continue to undress, he just pulls his cock from his running shorts and presses into the slick entrance of Izuku’s pussy. It’s a tight fit, but after three hard, full thrusts, Izuku is bending to take it, moaning into the entry way mat. It’s dirty. He feels dirty, but oh god, the arousal in his center burns outwards.

“Fuck,” Katsuki grunts lowly, like he didn’t mean to, and Izuku cries out when he’s grabbed and pulled backwards into the thrusts, the huge cock dominating his insides. He feels small, he feels used, and it’s so fucking good.

He can’t help it, Izuku reaches and works his clit with his fingertips (he’s a professional now), and he’s coming within only a few passes, after edging himself all morning. Katsuki groans with it, coming in huge spurts, the cock inside flexing so hard Izuku can feel it, and he trembles with it.

Pulling out, Katsuki merely tucks himself into his shorts, slaps Izuku on his bare ass cheek, and wanders away, leaving him leaking come and slick on their entryway floor.

Fuck, Izuku whines with another pulse of arousal.

On the couch as they cuddle after lunch, Izuku bites hard into his bottom lip when Katsuki, half-distracted by the TV show he was yelling at, collects Izuku’s and his juices from his cunt and draws it back to his ass, entering his tight hole with finger after finger, feeding come and pussy juice into his hole.

“Oh god,” Izuku cries into the couch cushion, ignored by Katsuki, who’s got two fingers inside and drilling against his prostate. Izuku comes like that, trembling, mouth open, and is left in a mess of sweat and discarded clothing as Katsuki, hard as nails, keeps his fingers proprietarily against his cunt and ass, just feeling, just laying claim.

At dinner, Izuku is urged under the table to lick and suck at Katsuki, who was a professional at holding off orgasm so long, Izuku’s mouth feels numb when he’s finally tugged off the floor to collapse on the table, and fucked again against its surface, his full dinner plate by his head.

Katsuki bites him all over, slaps his ass, crouches over him like an animal just to fuck in harder, and Izuku is lost in a sea of pleasure and want and a weird sort of happiness.

He reemerges to find himself cuddled up in bed, clean, warm, and wrapped in strong, large arms. He purrs, petting at the biceps, licking at what he can reach, groaning and sore.

“Hey baby,” Katsuki whispers, sickeningly sweet for him. It’s rare he’s like this, and Izuku soaks in the kisses pressed to his forehead and eyelids. “You okay? Was that what you wanted?” He’s not nervous, but he’s checking in. Katsuki was so good to him, so good at communicating now, so brave.

“Yes,” Izuku moans, sweet and content, he twitches his cunt and it throbs back at him. “So good, Kacchan, that was perfect, I…I love you so much.” He accepts the kiss Katsuki’s presses into his mouth. “Did you like it?”

“Yeah. A lot. Though, I wanted to take care of you more, you seemed to like it when I left you after fucking you.” Katsuki is dragging his soft fingertips up and down Izuku’s back, his spine.

“I really like being taken care of. But the feeling I got today, it’s…it’s hard to describe. I like being used by you for your pleasure, it feels so good for me. It’s a weird feeling of safety. And care, even though it might seem like you aren’t taking care of me like normal, you know?”

“Sort of.” Katsuki nibbles his ear, and it makes Izuku giggle sluggishly, ready for sleep. “Nothing bad?”

“No, not today. You did everything right Kacchan, sugoi.” Izuku lets his lips fall to his lover’s chin and cuddles closer.

“Good. Sleep, you idiot. You got fucked like, six times today.”

“So good.” Izuku says, but he might had been dreaming already.

The only thing that seemed to be missing, was Katsuki felt decidedly unpenetrated. Izuku tried to help with fingers, and their small collection of toys, but it wasn’t the same without Izuku digging his forehead into Katsuki’s chest, thick cock inside, and fucking him like a jackrabbit until Katsuki whines with overstimulation.

“We should get a strap on.” Katsuki mutters after another day of marathon sex – he’s getting tired, his cock is ready to give up. Izuku on the other hand, seemed unstoppable. They hadn’t had this much sex since their last year of high school. Not even then, since this had a time limit.

Rolling green eyes, Izuku leans over to kiss him with a smile on his mouth, and then dresses in his robe. He wants to eat something and work out.

On the last day, Izuku lay spread on the couch after another screeching orgasm that overtook his entire body, and he’s pouting.

“I want my cock back.” Izuku sighs despairingly. They were bored and pent up and ready to go back to work.

Katsuki grunts in agreement, reading with his glasses perched on his nose.

“Do…do you?” Comes the quiet question from the couch cushions, and Katsuki jerks his head up to glare. Izuku is hiding though under the throw pillow with All Might’s face on it.

“Yes, of course I do, stupid.” Katsuki says, frowning. He’d thought he’d been clear.

“Oh. Okay.” Izuku breathes out, still vaguely jittery. The fuck did Katsuki have to do now, to get him out of his fucking head. “I mean, you really liked it. I really liked it. But it’s not…me, you know?”

“I know. You were still a man with it, just like you are with a dick.” Katsuki tells him and spies a green eye peek out at him. Something hot enters Katsuki’s gaze, pinning that eye on him. “I liked it so much because that cunt is mine. I fucked it to fit me, and I’m the only one to have every fucked it.” Possessiveness shines in his next grin.

“I love you.” Izuku says to him, and Katsuki adjusts his glasses so he can watch him roll his eyes.

“Yeah, I love you too dumbass. Whatever the fuck is in your pants.”

Izuku woke the next morning and felt his cock flop against his thigh as he rolls towards the warmth of his boyfriend. He groans, loud, obnoxious, and relieved.

Upon waking, Katsuki bullies him onto his back and spears himself down onto his cock with little preparation, groaning in need. Izuku does his best, grinning the whole time at the feeling of his cock being there, using it, and coming deep inside.

Yeah, he prefers his cock.

At the agency, Izuku is checked out by the doctor and given the go ahead, and they make their way to Miruko’s office. Her dancing eyebrows and smart mouth make Izuku stare at the ceiling in embarrassment feeling like she could see every one of Katsuki’s marks on his body beneath his uniform.  

“The fuck you want?” Katsuki growls, ever combative.

“I hope you had a good time. I had to field three different sound complaints from your neighbors and the cops, so you owe me, you sluts.” Miruko snorts. “Also, we got the kid who was doing all this. Just a stupid preteen with a bad sense of humor, he’s been firmly punished for excessive use of his quirk. But I do have his contact information if you want to have another go.”  

Izuku whines in embarrassment, covering his face.

 “Nah,” Katsuki answers with far too much leisure, “I prefer him with a dick.”  

“I hate you both!” Izuku cries out, snatching the next case file off Miruko’s desk and speeding away, only just hearing her begin to laugh and Katsuki start swearing at him, stomping behind.