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The ray of warm light outside of the school's gym storage closet extinguishes with its doors— shy of a slam— close, leaving the room dark with only light coming from the small window high above behind him illuminating the room in an array of plain, cold, and dreary blues.
Izuku blinks at it for a moment before he pushes himself up with his palms. His feet slip against the dusty, dirty floor under him and his pants hang uncomfortably low to the half of his thighs.
His hips hurt. His waist hurts. His arms hurt. His neck hurts.
Izuku can almost clearly hear the actual door leading to the gym closing with a distant bang. Pulling up his pants and redoing his belt while his gakuran jacket lays wrinkled and unbuttoned under him.
Kacchan was particularly rough today; Izuku can't even think of a reason as to why.
Grabbed by the wrist and forcibly pulled into the space for their afternoon activities was what left Izuku aching and stumbling in his clothes awkwardly until he could slump against the wall once he successfully gets a hold of managing his disheveled state.
Waiting thirty minutes is the minimum before he can go home himself. Izuku lightly frowns with exhaustion gradually pulling down his brows for every button he fixes on his worn again gakuran.
Barely symbiotic harassment is the closest definition to what they're doing— at least that's what Izuku thinks.
Bully and victim; wolf to sacrificial lamb. Izuku isn't a girl, he can't get pregnant. So in ideal there's no risk for Katsuki to use his body for his natural sexual desires.
Kacchan gets his fix and Izuku can lie to himself for an hour and a half that it means something special. Can take the handkerchief Katsuki always gives him once they're done while he mutters to Izuku to give it back the next morning or next Monday.
As long as he never tells Katsuki the truth of what he thinks he'll keep getting the sustenance for his own heart's delusion— so Izuku keeps his mouth shut and runs with the pleasure to escape the feelings that always catch up to him once he's done cleaning himself up.
There's fresh news of an incident that got resolved by heroes in the town nearby. Popping up on his phone that lights up the darkened room around him, Izuku has twenty more minutes to go.
Today was just another day.
And so should have been the next— but Izuku's stomach twists into itself; and it's not with morning hunger.
Izuku sits himself upwards.
His mouth tastes bitter and the unwanted flavor is heavy on his tongue. His bottom lip quivers. His right hand mirrors it when he moves it to hold his sheets up.
There's something wrong with his body— he wouldn't have noticed it had he not been more than half awake while shifting his position in wait for his alarm to go off. The sky is still dark out and there's barely provided light with the slowly diminishing moon, and he can hear his mother outside shuffling her way through the dawn for her shift. He starts getting ready at least ten minutes after she leaves, but Izuku doesn't know whether or not he should go to her right now.
Izuku almost wants to brush it off and think of it all in his head but he can feel it. Something is wrong in his lower body and even the slightest leg movement causes that difference to send electricity up his spinal cord and to his already hyper-aware brain.
Izuku splays his legs apart and the sensation and alarm grows tenfold with every moving inch until he finally feels brave enough to use his remained free hand to lift up his boxers and—
Izuku screams.
Slow steps echo throughout the hall, Aldera is empty at this time of morning.
Izuku purposefully glances away from the one other girl in front of him walking to her own classroom.
His pants fit the same but there's a foreign fitting to them with his every drag of his feet.
Izuku looks the same— other than his problem. So it must have been a quirk accident otherwise he'll have to expect some jeers later if it's the alternative. But it has to be an accident, he has to have bumped into someone, something, anything. No one could be that cruel, right?
The past day is blurry. Izuku can barely recall anything.
Questions swirl over and over again in repeated motions and cycles. Golden morning sun leaks through the windows and rises up the classroom's simple walls. More and more students enter until the warm light is fully in and uncomfortably stinging onto his skin. Izuku can feel as his arm seems to be burning up at his side and yet it remains twice, thrice, maybe even more cooler than the scorching burns Kacchan sometimes gives him when he seemingly walks too many wrong steps onto the nerves that maintain his anger.
Cruel, cruel, who would be that cruel? Izuku is staring at his desk with his head held down but he's absentmindedly paying attention in the most vague sense of form to the different classmates slowly filling the room. But none of them have the quirk needed to change— to change his sex even if only by the lower half of his body. It would have been known since the start of junior high. But his eyes still trace the disparate teens and the small notes he mentally made of them and their quirks in his first year out of pure interest run against each other like a computer being info-dumped—
“What are you muttering about this time?”
Izuku raises his head the slightest he can to the side and finds Katsuki close. Goosebumps form on his skin from the whiplash of how quickly Katsuki's shadow blocked out the warmth from his skin. Izuku ignores the other (most likely) probable reason as to why they formed.
“K-Kacchan…”
“Are you mumbling about quirks again?” Multiple people turn back to stare at him and Izuku shrinks. “Fucking stalker, wasn't even coherent. What's up with that?”
“It's nothing. I was just mostly r-repassing my studies yesterday.”
Katsuki sneers and scoffs before heading back to his seat and he sees other students mimicking the offending action. But Izuku doesn't care and rather counts the few lucky stars he has for the fact that no one who may have paid attention to his quiet ramblings would have understood the main reason for them.
Almost every seat is filled and even the ones that missed the day wouldn't have fit towards being the cause. Homeroom begins and Izuku's tightened grip on his pencil matches the shaking press of his thighs.
Izuku managed to sneak Kacchan his handkerchief back when the lunch chime sounded— by giving it to him discreetly while being cornered by him and his friends.
No one noticed the light tuck of it in Katsuki's pockets or the second-lasting look he gave Izuku that signified for their soon-to-be time together.
But Izuku can't today.
Izuku bites his lip and clenches his fingers onto the sleeves of his gakuran.
He's waiting beside the door of the storage closet. The gym isn't hot but it's not cool either, the warmth is just borderlining on the edge of uncomfortable and slightly humid when the main door opens and familiar footsteps echo throughout the large, empty space.
Izuku braces himself.
The footsteps are closer and louder when Izuku finally fully looks at Katsuki in front of him with a meek look.
His gakuran is already unbuttoned and there's sweat dripping from the sides of his temples— Izuku thinks it looks uncomfortable— but he knows Katsuki prefers it over the winter any time.
“Quit staring, get in.”
Izuku pauses for a moment before taking a deep breath and shaking his head. Katsuki lets out a small “Ah?” at the denial he hasn't gotten in months.
“Kacchan… I really don't want to today. I'm not feeling well and there's a new All Might special and mom has been asking why I keep coming home so late an hour after school ends and—”
Threatening pops of small explosions crackle at the center of Katsuki's palms. Izuku knows better than to keep running his mouth.
A second passes before Izuku, dejected and nervous, silently goes inside the dusty storage closet. Knees buckling onto a dusty mat left unused for its proper purpose for an amount of time he doesn't know with nails dug into his skin. And he doesn't know how to get out of the situation before Katsuki inevitably forces them both out of their bottom half's clothes. And he doesn't know what he'll say when he sees—
“Don't act like this is the first time, you know what to do, stupid nerd.” Katsuki snarls.
Izuku wants to sob.
The soft clinking noises his belt makes while he undoes it matches Katsuki's own behind him. But Kacchan’s zipper gets opened first and Izuku is awkwardly hovering his hands over his. Biting his bottom lip and praying he can figure out the quickest way out of this while he stares at the high window in front of him on the dirty, peeling wall.
The natural light apparently is subconsciously distracting enough because soon he finds himself pinned down onto the ground with Katsuki tearing off his pants himself and—
“... What the fuck?”
Izuku hisses under his breath,
Katsuki's confusion only grows the longer he stares at the cunt in front of him, brows raised and mouth slightly hung open while Izuku shivers under him in humiliation.
“Where the hell is your dick?” Katsuki says in disbelief and Izuku was just about to respond with his theory when a finger traced over his outer folds.
Izuku yelps and tries closing his legs, Katsuki shoots him an annoyed look before forcefully opening his legs again. “So?”
“Q-Quirk—” Izuku actually whines at the sudden rubbing against his faux clit and he can feel himself start to tear up in embarrassment. “—accident.”
Katsuki's slips further into his slit with his middle and ring finger while his other hand spreads him open. Showing off parts that don't naturally belong to Izuku. The embarrassment has Izuku feel like he's seeing something not meant for him. Cheeks flushed a pretty scarlet similar to the color inside him that has Katsuki in an almost trance like state.
(Kacchan is a boy after all, so...)
A feeling of rejection and fear wells up inside. Izuku starts to slightly close his legs again— but not to hide. Not this time,
Katsuki was just about to berate him before the light grind against his fingers and the moan that follows up from Izuku forces him to pause. Watching the soft cunt suck his fingers in with every rub and grind.
Katsuki hisses under his breath and pays a glance to the growing bulge in his boxers before twisting his fingers just to watch the boy under him groan in chase for climax.
Every pump has a growing wetness caused around the sensitive flesh that doesn't go unnoticed by either of them and Izuku wishes that the world would swallow him whole before Katsuki does.
But Katsuki has always been quicker once he has his mind set on something.
Izuku jumps when Katsuki dives down for a taste. Tongue lapping against the soft, warm folds and grinning at the increase in noises from Izuku. Twisting his tongue and licking up the wet slickness inevitably starting to gush out.
“Fuh, ah!”
His whining and failed attempt to push the blonde's head away falls idle with Izuku's hip movement falling contradictory when they rock further and further against the overwhelming stimulation.
Katsuki grins and uses a free hand to stroke the soft, swollen nub of his clit and Izuku isn't able to bite back the surprised moan he lets out with shaky breaths. Thighs straining to continue clenching onto the tongue that's fucking him open with lidded eyes glossing over in the result of storming emotions running a hundred miles per hour in Izuku's mind.
“Kacchan!...”
Suckles stimulating his folds and outer hole provide only dizzying pleasure that's slowly starting to build up into a rope threatening to snap inside Izuku's stomach. And it feels like it's the first time Izuku ever learned what it felt like to get close to his release with a deja-vu esque feeling making him unable to decide whether to try and force a stop to the stimulation out of instinct or to keep going also out of instinct.
A different type of instinct that isn't normally his own, not with the difference in his lower half.
Izuku shifts in his place and tries grinding down closer into Katsuki's devouring mouth that's taking everything that's being offered whole so far when the blonde's face is back in full view instead of the top of his spiky hair. Izuku's shame only grows when he's barely able to hold back the moaning whine when he notices there's visible residue that belongs to him leaking from the corners of Katsuki's mouth.
“Fuck you taste good for a nerd,” Katsuki's dick twitches as if to emphasize the arousal he feels when Izuku releases a small noise at the praise, “but I'd rather see you come on my dick rather than my mouth.”
Katsuki laughs meanly at the shy and resigned nod he's given for reply. “What are you? A pillow princess?”
The buck of Izuku's hips doesn't go unnoticed either— in fact, they both stare at each other dumbfounded at the unexpected reaction on both ends before—
“Holy shit,” Katsuki is smiling; he's smiling and it's only cruel, “you liked that? You liked being called princess?”
Izuku's turning his head away and the rough grab of his chin to look straight at Katsuki makes him gasp.
“Answer me when I'm talking to you, Deku.”
An unsaid threat goes by that Izuku has less then a second to spare before Katsuki starts to get impatient, Izuku slowly nods his head once more with light breath escaping his mouth.
“Yeah, yeah you do,”
The humiliation is too much, tears finally start to fall.
Katsuki huffs in feigned annoyance and moves his other hand down to his boxers. Freeing his dick that's so hard it's almost painful with pre-cum oozing out of it.
“Otherwise you wouldn't have reacted like a cheap whore.” His face is curled into a scrunched up sneer, Katsuki slowly pumps his cock and makes sure Izuku watches. “Kinda like that one bitch in the neighboring class, hah? Maybe your stalker tendencies got the best of you and you watched her get fucked. For your analyses, right? Learned a thing or two from other sluts like you, Deku?”
The teen under Katsuki vigorously shakes his head. The blonde scoffs for a moment as he starts getting ready to line his dick against Izuku's hole.
That catches his full attention, clearing up any chance to force him into a stupid state. For better or for worse, Izuku starts speaking up again.
“It's not enough! Ka- Kacchan it's not enough! It won't fit it's going to hurt!”
“Girls self lubricate or some bullshit like that. You got a fake pussy that works just fine like one.”
Katsuki continues to press the tip against him before a new realization dawns onto Izuku.
“No- No! Condom! Use a condom!”
“Hah? This shits temporary, isn't it? Not like you have a uterus in you.”
Izuku is thrashing his torso and kicking his feet. Writhing his body and ignoring the scorching heat coming from Katsuki's palms that immediately moved to hold both of his wrists uncomfortably captive above him on the mat.
“Stop- fucking— stop moving!”
“Use the condom! Use the condom!”
“I barely use the condom on you! How do you even know if I still have it on me, huh?!”
Izuku grits his teeth and bites back a panicked screech when Katsuki burns him lightly on the side of his hips with one hand. Leaving a red hand-print that catches Izuku's attention for a moment. A moment too long that has him ending up fully pinned down, completely immobile.
“Kacchan!”
Katsuki grunts in annoyance under his breath and firmly aligns his cock against the opening of Izuku's hole. Looking down almost dazed at the soaked pussy until Izuku tries— and fails— to close his legs again. Clicking his tongue he trails his finger on Izuku's clit for a moment and grins at the gasp Izuku lets escape.
“You should just shut up and get pregnant.”
Izuku cries and he doesn't know whether it's fear or pleasure overpowering. Katsuki smirks sadistically and mocks,
“They say bullshit like our parents are our heroes. Don't you want to be a hero, I-zu-ku?”
Izuku can feel himself release more pre-cum that slicks his faux folds at the cruel words spilling from Katsuki's tongue.
“Yeah,” Katsuki mutters and he lets his hard cock grind against Izuku's seeping cunt. Teasing it with a thread of thinning self control. “I’ll make you the hero you wanna be, Deku. Just spread your legs and I'll let you have the honor of helping carry my quirk down the bloodline princess.”
There's practically a pool forming under him at this point; and Katsuki laughs when he says: “My damn handkerchief won’t even be enough to clean half of your gross ass spilling this time. It's fine, you know why, Deku?”
Katsuki moves closer in front of him,
“Cause’ I'm gonna make you even wetter now. I'll give it to you- fuck your chance to be a hero into your slutty hole right now!” It's all the warning Izuku gets before he chokes on the half breath his lungs tried to fully take with the rock hard dick finally slamming in.
Izuku bounces on the uncomfortable mat and manages to wrap his legs around Katsuki’s waist with a pained groan and fingers digging crescents onto his palms. Whining at the deep noise Katsuki lets out once the familiar and yet unfamiliar heat enveloping his dick finally starts to settle in.
The walls pulsate and suck his dick in around him. Katsuki is clenching down on his teeth with his grip tight enough onto Izuku's wrist that his skin is already forming a bright red hand-shaped bruise matching the one on his hip.
It's so tight it's on the verge of hurting. But the slow pumps inside Izuku go by easier than the extra patience he usually has to give lest he wants blood on his dick. But he knows that there's still risk and one look at Izuku's messed up state as he quivers under him with the wave of different muddled emotions is enough to make Katsuki roll his eyes whilst softly stroking the other boy's wrist in some sort of reassurance.
Izuku whimpers, he's dizzy and confused and the concerns about his body are pasting themselves in his mind's eye like a slideshow. Shuddering at the soft touch against his skin that unconsciously relaxes him enough to loosen up his hole around Katsuki's dick.
Katsuki takes his chance.
He pushes deeper into Izuku until his faux folds are halfway into hugging the entirety of his dick. Katsuki has just the slightest semblance of control left to not immediately start using Izuku like a fleshlight.
Izuku's legs are still around firmly on his waist, Izuku doesn't know if he's doing it out of pure habit of search for pleasure or if his body is looking for a desperate chance to ground him.
Kacchan's face is more strained— that's the first thing he notices when he finally looks closely back at Katsuki again with drooped eyes. Not any more strained than the first time they ever did it back in the middle of first year— Izuku guesses a girl's body is really more convenient.
“Kacchan…”
“Shut up.” Katsuki growls, grinding his dick into his hole but Izuku is starting to become more aware of his restraint, restraint almost thoughtful coming from Kacchan.
“Ka-”
“Shut up!”
“Is it better?”
There's a tremble in Izuku's voice when he says it. The movement stills and red eyes bore into him for a moment before irritation starts clouding them up in their focused place.
"Hah?”
“I just- it hurts but it's going in… easier…” He mumbles and shifts. “And I-”
“What? You think now that I know what pussy probably feels like I'll start fucking one of those drooling, whore bitches in our class or the ones next door?”
Izuku's brows furrow and he looks away. Katsuki sighs before releasing his wrists and snaking his hands back down to his waist.
“Why should I when I can just have your pussy? Quirked one works just fine.”
“It's not permanent! I- I hope.”
“It's not.”
Izuku nods in agreement before blinking for a second. Looking up to Katsuki with a curious (accusing, suspicious, fearing) look:
“... Why'd you say it like that Kacchan?”
“Like what?”
A small smile turns on Katsuki's lips with his brows down turned into a cruel and teasing look and—
The possibility of the newfound explanation is something that hits Izuku like a train.
“Ka- Kacc-”
He didn't.
Izuku's shaking with newly formed tears and Katsuki's smile widens as he finally starts fully moving again, deeper and deeper. Pulling out and pushing back in for even thrusts. One hand pulling away from Izuku's bucking waist to swipe against his swollen clit.
He did.
“Quirk accidents can't be that specifically incidental, right, Deku? How many sex related quirks do you think are out there in the world and are that easy to just do? You got your nerd analytics.”
Izuku is pale. Izuku is confused. Izuku is gripping onto his gakuran to ignore the growing pleasure threatening to take over his mind whole again.
“Paid the bitch to do this shit to you weeks ago and now it happens? Just overnight when you were normal yesterday? Fucking bullshit.” Katsuki grunts with a particularly rough thrust. “But it's not that disappointing. Worth the wait to get to see you come on my dick like a bitch.”
One push, two, Izuku whimpers and clenches around the cock that's speeding up inside him and rubbing against the silky walls not his own. Loud squelching noises and light squeaks from the mat under sound the room.
“So you better enjoy it, I-zu-ku.”
Izuku can only momentarily make out a mutter under the blonde's breath about the money he had to spend but it goes unheard when Katsuki fully pistons in and out of his hole and practically destroys any amount of air left in his lungs. Overwhelming every part of Izuku's brain until he can't think outside of taking pleasure instead of the confusion and everything else.
Tears fall like an open faucet down his cheeks and Izuku gasps and clenches around the thick cock intruding his walls. Clit red and pulsating when he moves to touch himself. Katsuki allows it— watching with a twisted grin as he sees Izuku fall apart in a new way under him. Tears and dripped spit from the side of mouth all falling into the gym mat in the nastiest way possible.
Katsuki grabs and uses Izuku's waist to pull him down on his cock until it feels like he's burying it into a makeshift womb.
“Hah- fuck, really gonna get you pregnant Izuku. Really gonna keep my fucking promise!”
“Ah, ah, ahn!”
Loud skin slapping sounds are bouncing off the walls and Izuku's eyes roll to the back of his head. Soft noise of complaint huffed out when Katsuki pulls his dick almost fully out before slamming back in just to test if Izuku would scream. The choked gasp yelled out is as close he'll get for now but it's enough.
He moves to rub circles into the soft nub Izuku's touching on his own and Izuku cries at the overstimulation in his senses. Thighs shaking and tears falling everywhere until it's too much and white liquid spills onto the cock. Tight and palpitating and sensitive.
The stimulation is continued until it's moved to his red, perky nipples. Something that wasn't originally made for pleasure becoming one after Katsuki worked his damnedest to. Flicking them while Izuku cries and shakes his hips against his dick.
The sight is enough to push Katsuki over the edge.
Izuku is wordless with no coherency as his body falls limp to accept the spurting of come filling his insides. Only numbing pleasure and nothing else is registered in his brain. And maybe, maybe when he thinks back to this moment when he's back at home searching to find how long the quirk or similar lasts he'll flush when he thinks about the fact that he really did come just like a girl, and accepted Kacchan's seed like a bitch, as he would say.
Soft lips press onto his cheek and Izuku turns his head and accepts the affection silently with tears causing spillage from his eyes and hole still searching to milk more filling into his insides.
“That-” Izuku hiccups and continues pressing his face against Katsuki. “-You’re cruel Kacchan…”
“Yeah,” Katsuki readily agrees and kisses the tears from his eyes before smiling down to spit onto the twitching clit and kissing feather light at it before raising to properly start aligning his dick once more to the filthy, swollen, cum dripping hole. “but you want to carry my quirk, don't you princess?”
Izuku sniffles and accepts the hands spreading his legs wide open again. Blood rushing back to his face until he's red. The sweat matches the dripping in his pussy in terms of oozing down his side similarly to the mixture of seed.
“Then get to it, Deku. Didn't do this shit for one fuck, after all.”
Izuku thinks the spit leaking from Katsuki's mouth makes him look like a beast that's been left unfed for far too long.
(And his body is just the fruitation and flesh meant to get stuck in-between it's teeth.)