Work Text:
It’s easy for Katsuki to let his work get away from him. Especially when he’s focused like he is tonight. Hours pass by without notice, his eyes grow heavier and more tired as he works.
He jumps when a knock sounds at his office door. Blinking, he looks up to see one of his coworkers from the office down the hall.
“Bakugou! Thought you were leaving early for your heat, man!” he says, and the reminder sends a familiar shiver down Katsuki’s spine.
“Fuck,” he says, immediately closing his laptop and gathering up all of his things. He checks his watch for the time. Fuck! He was supposed to leave two hours ago!
As if by some ill stroke of fate, Katsuki can feel his skin start to grow hot — a tell tale sign of pre-heat. It’s not great to be out in public smelling like this, but it could be worse.
“Holy shit, dude, you better get home, you know what could happen if you don't,” his coworker says, snickering. Katsuki rolls his eyes, but mostly ignores the comment. Normally he would tell him to fuck off, that he could take on any alpha that tried to get to him after curfew, but he doesn’t have time for that. There are more important things at stake here. Like getting home before some entitled alpha catches a whiff of him.
He shudders at the thought, but carries on home, all but sprinting out of the office and down toward the train station. His heart thumps erratically in his chest as he waits for the next train, having already missed the one he usually takes. He glances around him, constantly checking his surroundings for any threats of danger. The crowds that pass him by don’t seem to pay any attention to him, though, or notice that he’s started pre-heat. It’s a fucking blessing.
The curfew is only meant to keep omegas safe. So that they’re less vulnerable to alphas who may be aggressive or rutting. But in a way, it’s really just set up a society where alphas wait and prey on omega stupid enough to be out past nine.
After what feels like forever, the train finally pulls into the station and he boards. The car crowds with people and Katsuki stands, trying to stay as far away from others as possible. He checks his watch for the time, relieved to see he’s still well within the curfew window. The train starts to move, and he swears he can feel body temperature rise even further. He shifts uncomfortably, trying to pull his collar up further over his neck. Should have worn an extra scent patch or something.
Fuck.
His entire body is tense for the rest of the train ride home. His palms sweat, and he fills with dread as he can feel himself starting to slick. This is bad.
When the bell rings to signal that doors are opening, he bolts. He doesn’t care who he has to push out of the way, who he has to trample over — he just needs to get out. Just barely, he makes it out of the car before another passenger grabs his wrist.
Panicking, he inhales sharply and pulls his arm back before spinning around to face his assailant.
“Get the fuck off me!” he shouts, eyes narrowing in on a large man with curly green hair. An alpha. Fuck. The man blinks, clearly taken aback by Katsuki’s reaction. Whatever, Katsuki doesn’t care. The man reaches for him again and Katsuki slaps his arm. “Fuck off, knothead!”
And then he makes a run for it.
He sprints out of the station and doesn’t stop until he reaches his house. By the time he gets in the door, he’s out of breath, his limbs shaking from exhaustion. The house is quiet. Empty.
It gives Katsuki the moment he needs to catch his breath and be still. He slides down to a sitting position on the floor and rips off his scent patch, allowing his pheromones to flow freely in the privacy of his own home.
While he’s at it, he unbuttons his shirt and discards that as well. He doesn’t have much time before his heat kicks in.
He makes the usual preparations — bringing food and water with him to his nest in his bedroom, taking out his box of heat-aid toys despite the protests of his inner omega. None of these stupid toys measure up to a real alpha.
With a final sigh of relief, he kicks off his pants and crawls into his nest. Warm. Safe. Secure.
The perfect place for him to relax and give into the throes of his heat. He takes out one of the toys and stuffs himself with it, just enough to relax his tense muscles. The urgency to be filled and bred is closer to being satisfied. It's not the same as the hot, throbbing knot of a real alpha, but he can close his eyes and pretend.
Just as he starts to drift off, his eyes snap open and he gets this sudden, sinking feeling.
He’s not alone.
___
Izuku turns around to get a good look at the passenger who pushed him. An omega. He gets a whiff of him and holds back a groan. He can smell his preheat. This guy must be pretty brave to be out in public smelling so amazing. He wants to tell him this, but before he can get a word in, the stranger cusses him out and calls him a knothead .
So rude!
He’s never been called that in his life . Knothead is a term reserved for alphas who are awful and have no respect for omegas. Izuku is very respectful, thank you very much.
He watches the omega slip through the train’s doors.
For a moment, Izuku considers letting it go, but the whole situation just doesn’t sit well with him. It’s frustrating thinking that this guy is just going to go off into the world still thinking of Izuku as a knothead.
Besides, it’s so close to curfew. Doesn’t he know that it’s dangerous for someone like him to be out so late? Especially so close to a heat? How irresponsible of him. It’s almost as if he’s asking for something to happen. So really, it’s good that Izuku is following him. He’ll make sure no one else attacks him.
Izuku exits the train just before the doors close. He stays far enough back so that he remains unseen, but close enough that he can keep an eye on him.
Once outside, the wind blows and he catches the stranger’s scent again. Oh fuck. He’s practically dripping with pheromones. His lips twitch into a wry grin as images of the pretty omega taking his knot suddenly flash in his mind.
Izuku has manners and he’s not a hypocrite.
When the blond omega reaches what appears to be his home, Izuku stops around the corner, waiting for him to go inside.
He would just approach him, or knock on the door, but the omega would probably scratch his eyes out. Izuku doesn’t want to startle him!
Instead, he circles around the house and looks for another entrance. Behind the house, there’s an open window.
An open window! Really?! Izuku lets out a disappointed sigh. He doesn’t understand how someone could be so careless. He quickly scans the area, then climbs through it.
It’s easy enough to get inside, and it’s even easier to figure out which room the omega is hiding out in. The entire house reeks of heat and all Izuku has to do is claim his prize.
____
Katsuki freezes with his knot toy still shoved deep inside him. His stomach drops, his building orgasm coming to a sudden, uncomfortable halt.
Something is off. He isn’t able to place it right away, but the scent in the air starts to shift. There’s his own scent, the thick aroma of his heat, and . . . something else. No, not something.
Someone.
His stomach drops, unsure of what to do. He’s in a very compromising and vulnerable position: legs spread wide while he fucks himself. His skin still burns from the onset of his heat, his insides churning and begging for release of some sort. Omega instincts clash in his head, the ones telling him to run and hide conflicting with the ones telling him to continue satisfying his reproductive needs.
“Who’s there?” he calls out, just as he hears a thud come from the other side of the room. Crap, there’s definitely someone in there. But the room is so dark, and his vision is blurry from his heat. He's in his most vulnerable state when a figure emerges from the shadows and Katsuki cries out. “Get out!”
His voice is weak, though. Doesn't have the fight that Katsuki wants it to.
“Shhh, don’t scream,” he says, the stranger’s voice low and surprisingly soft. Katsuki grabs a blanket to cover himself with, shuffling further back into his nest. He reaches for another of the heat toys and throws one at him. “I just wanted to talk to you.”
He comes into view finally—a man with freckles and green hair. His face is vaguely familiar, but Katsuki can’t place it for the life of him. Why is he here? How is he here?
“Who the fuck are you?” he spits, trying to hide how badly he’s shaking. He’s not scared. He’s fucking not.
But this man is an alpha. And his scent is thick and driving his omega wild. Fuck. No, he doesn’t fucking want a stranger. Much less a stranger who broke into his fucking house.
He shouldn’t have left so late, this fucker probably smelled him and followed him home. Probably threw him into rut and now he only has one thing on his mind.
Katsuki is fucked.
“What’s your name?” he asks. Katsuki just stares, mostly in disbelief at how casually the man talks to him. Does he not realize that what he’s doing is fucking creepy? “My name is Izuku, but you called me a knothead earlier and, well, I am not a knothead.”
“What?” Katsuki gasps, not following.
“On the train. You pushed me and called me a knothead,” he says again. Katsuki stares in disbelief, trying desperately to keep up with the man’s rationales. His head is too fuzzy, too out of touch to fully comprehend or process what’s going on. If only he'd just left the office a little bit sooner.
“Fuck,” Katsuki groans.
“Anyway, so I guess you can apologize to me now,” he says, casually. He shrugs his shoulders and smiles.
“Apologize?” he chokes. For what? What is he apologizing for? This guy is fucking insane.
“Um, for being rude. I’m not a knothead, and I really don’t think I deserved to be treated that way. I didn’t do anything to you,” he explains, his voice suddenly growing dark. Katsuki’s breath catches in his throat as the alpha enters his nest uninvited and crawls over him.
He struggles and pushes at his shoulders, trying to get him off. The alpha's body is heavy and warm, pinning him down and trapping him. His arms shake, weakened from his heat. It’s fucking useless, but he tries anyway.
“Please don’t,” he gasps, frantically, trembling as the alpha tears the blanket away. The only thing shielding Katsuki’s privates from the intruder.
“Oh wow,” he says, eyes falling to Katsuki’s small omega cock, and the slicked toy slowly sliding from his hole, being pushed out by his pulsating rim.
Katsuki watches in horror as the alpha’s eyes go dark and his scent grows heavier.
He grips one of Katsuki’s thighs, holding him down as he pulls the toy out and tosses it away. Katsuki shouts, hitting the alpha’s arm and trying to get him away. But the alpha is strong and impossible to resist now that he’s clearly starting to rut.
Katsuki’s fate is sealed, but he still does everything he can to try and stop it.
“Get off me! Stop!” he shouts, but his protests only earn him a forceful hand shoved against his mouth.
“Stop. Yelling.” Izuku hisses, his voice low and more menacing than before. “You still won’t even apologize! But that’s okay, I know how you can make it up to me now.”
Tears spring to Katsuki’s eyes as the alpha frees his cock, large and thick with the knot already forming at the base. He keeps a rough hand over his mouth, likely bruising his jaw.
Katsuki squirms, desperately trying to close his legs. But it’s no use. The alpha is strong. And Katsuki is rendered useless by his heat.
His cries are muffled as the alpha pushes into him without any additional warning. With his heat and the whole situation, he can’t decide how to feel. For one thing, the pain of his heat is instantly soothed by the alpha’s knot and his pheromones. So fucking full that his omega croons, loving the way the man's cock pushes against his womb.
But in his head, he knows he doesn’t want things to happen this way.
He had wanted to meet a potential mate and be courted first. Not be raped and forced to mate with a stranger.
“Oh, you feel amazing,” the alpha shudders as he starts to move, keeping one hand over Katsuk’s mouth and the other on his thigh as he starts to move. “So wet for me.”
Katsuki shakes his head under Izuku’s grip. Stupid Izuku. Fucking Deku. He’s not wet for him! It’s his heat, he can’t help it— it’s not for him!
But Deku just moans and makes his thrusts even more forceful than before. He pulls at Katsuki’s thigh to get a better angle, driving his cock in deeper than before. Katsuki hisses and whines as his walls are spread wider than he’s used to, the friction much faster and more painful.
Finally, Deku takes his hand from his mouth, allowing him to gasp for air. The alpha’s arms hook under his thighs, holding on tight as he continues to fuck into him. His grip tightens, digging into the sensitive skin of Katsuki’s thighs and likely leaving bruises.
“You’re so pretty,” Deku moans, leaning over him, his mouth drawing closer and closer. Katsuki tenses and turns his head, but then realizes his mistake as Deku tries to go for his neck instead.
“No! Fuck, please, no,” he cries out, slapping his hands over his neck in a futile effort to protect himself.
“Let me kiss you,” he mumbles. Katsuki turns his face back to him, hands still protecting his scent glands. Deku leans in again, pressing his wet lips against Katsuki’s and prying them open. He chokes back sobs as Deku’s tongue slips into his mouth, swirling around and exploring uninvited.
“Oh, fuck, you taste so good,” he moans against his mouth. His thrusts become more jagged, more desperate, and dread rises in Katsuki’s stomach. ” Ah, I’m gonna cum. Wanna breed you. That’s what you want, right? To be nice and round with an alpha’s pups?”
“No!” he shouts, his voice cracking under the weight of his distress.
“Fuck, omega,” he growls, ignoring his protests as he fucks him. He doesn’t want it to happen this way. But it’s too late. The alpha’s knot swells to its full size, plugging him up so that he can pump him full of his seed. “Oh, that’s so good.”
He leans in, lips nudging at his hands.
“No, don’t,” Katsuki sobs. “Don’t mark me, please! I’m sorry for pushing you, I’m really fucking sorry! Just don’t—please don’t.”
Deku pauses, puzzling at Katsuki’s request.
“But I just knotted you,” he points out. “Do you really want to take that chance? I wouldn’t want you to end up pregnant without a mate.”
“I won’t,” he insists, even though there’s no way he could know that. “I’ll be fine, please, just don’t bite me.”
Deku stares down at him, his knot still lodged deep within Katsuki. His expression is unreadable. After a moment passes, he offers a smile, and Katsuki isn’t sure if he feels better or worse as a result.
“Tell you what,” he says. “I’m nice. And you apologized. Why don’t you tell me your name and we’ll call it even?”
“Katsuki! It’s Katsuki,” he says, quickly.
“Ah! Katsuki!” he exclaims. “I’ll call you Kacchan.”
He hates it, but he doesn’t argue. Doesn’t want Deku to change his mind.
“Thank you,” he says, despite the irony of expressing any sort of gratitude to the man who crawled into his room and raped him. He trembles as Deku kisses his forehead.
He slips out, his knot starting to soften, and Katsuki feels relieved. Thank fuck. He can finally leave Katsuki alone and they never have to see each other again.
Katsuki moves to scoot away from him, but Deku grips his hip and stops him.
“Where do you think you’re going?” he asks, his voice dark again.
“Y-you said you wouldn’t!” he shrieks, drawing back his knees to his chest, ready to kick if the alpha tries to mark him again.
“I said I wouldn’t mark you,” he grins. Katsuki’s eyes widen with horror while Deku reaches down to stroke his own cock back to life. “I didn’t say I was done fucking you.”
And with that, Deku flips him onto his stomach, grabs his waist and shoves his cock back in as hard as he can.
_____
It’s been two months since Katsuki was ambushed in his own home.
He has reinforced his home with extra security, but no matter what he does, he still doesn’t feel safe. Deku knows where he lives. He is constantly looking over his shoulder, worried that Deku could pop up when he least expects it. There have been countless false alarms on the train or at the grocery store where he thought he saw the alpha.
The incident left him paranoid. He barely gets any sleep anymore. He’s either too busy staring at his newly barred windows or playing with the knife he keeps under his pillow.
Deep down, Katsuki is itching for another confrontation. He hates how weak and vulnerable he was. He’s gone days without sleeping, and when he does sleep, he has nightmares. He sees Deku sinking his massive cock into him, splitting him open, his scarred hands probing and groping every part of his body. It’s disgusting. The thought alone makes him sick.
To distract himself, he’s been staying back at work. Staying late is exactly what got him into this mess, but he's not in heat anymore. If anything, staying late means there aren't as many people around to piss off on the train.
Katsuki’s coworkers have expressed concern. He’s been on edge ever since the encounter, so he can’t blame them. Whenever someone tries to pry, he quickly shuts them down. He’s sick of people asking him if he wants to talk.
He startles when someone shouts at him from across the office.
“Hey, Bakugou! Don’t forget to turn off the computers before you leave,” his coworker says.
“Yeah, yeah. I won’t,” he replies, flipping them off.
His coworker gives him the finger back then leaves.
During the team meeting, his boss had mentioned that the photocopier was busted. Since he plans on spending the next few hours here, he figures he could try to fix it.
Out of habit, he checks all of the doors first. Once he confirms they’re locked, and he's the only one left in the office, he heads to the photocopy room.
Katsuki stares down the machine. It’s ancient and bulky as hell. He presses the power button. It doesn't turn on. He tries mashing it, but that doesn’t work either. Katsuki clicks his tongue. He doesn’t have the slightest clue where the manual would be, so he plugs and unplugs it. Nothing happens.
“Stupid piece of junk,” he mutters, kicking the photocopier.
He raises a brow when he hears it slowly whir to life.
No way. That actually worked. Katsuki’s so distracted by his accomplishment that he doesn’t hear someone coming up behind him. He only freezes when he hears the person clap behind him.
His blood runs cold and his stomach drops.
“Wow! You really are amazing, Kacchan.”
Oh fuck. He doesn’t have to turn around to know who it is. A warm body presses up against him, pushing him into the machine.
“What the fuck are you doing here?” he snarls. “Stupid knothead pervert.”
Katsuki cries out when the alpha twists his arms behind him. Blinking back his tears, he stares straight ahead at the wall. He refuses to run from Deku. He’s not going to give him the satisfaction.
“Oh, Kacchan,” he sighs, exasperated. “Are we starting over? I thought we made progress. You apologized and I forgave you.”
Deku sounds disappointed, not that he gives a shit. The stupid knothead is talking to him as if he’s his damn pet. Deku can’t see it, but his expression contorts into a look of disgust.
“Fuck off with that garbage. How did you know I’d be here?”
“Your scent patch must have worn off and I happened to be nearby.” Deku says, rubbing his clothed cock against his ass. “This reminds me of our meeting on the train. It must be fate, Kacchan.”
“Shut up,” Katsuki snaps, trying to squirm out of his hold. “This isn’t fate. You’re just an obsessive stalker.”
Deku blatantly ignores him. Reaching around, his hand finds Katsuki’s hardening cock and squeezes. Katsuki moans, soaking the front of his pants, when he starts to stroke him.
“Oh! You’re hard .”
“No shit. You’re touching my dick.”
The alpha leans in, nuzzling his nose into Katsuki’s throat. He slips a hand underneath his shirt to grope his tits. Deku tweaks a nipple, then trails his scarred hand downwards, stopping over his stomach. He stiffens behind him.
“K-Kacchan. Are you... pregnant ?”
“Pregnant?” Katsuki repeats dryly. He barks out a laugh, his whole body shaking. “As if your pathetic sperm could manage that, Deku.”
Deku buries his nose deeper, focusing on his scent gland.
“God, omega, you smell so good.” He gently presses on his stomach. “You’re carrying my pups. I can smell it on you.”
Katsuki does not respond. Thinking back, he’s been feeling off since their first encounter, craving certain foods, feeling nauseous, and experiencing shifts in his mood. He thought Deku was to blame.
As it turned out, Deku was to blame, but for an entirely different reason.
When Deku starts rubbing his lower stomach, he snaps back, his head whipping around as he tries to see behind him.
“You’re sick, Deku. I’m not carrying your fucking pups.”
Deku wraps a hand around his throat.
“Manners, Kacchan,” he growls.
Katsuki tenses when the alpha's teeth scrape over his scent gland.
“Wait. What the hell do you think you’re doing?” he asks, trying to squirm away. The alpha grabs onto his hips, holding him in place. “Stop it! You said you wouldn’t mark me.”
“I did,” Deku agrees. “That was before I knew you were carrying my pups. You were so sure you wouldn’t get pregnant by me. I’m going to mark you now, okay? Be good for me, Kacchan. Hold still.”
“Fuck. Don’t do this. Deku, please . You don’t have to do this-”
“Shh,” he hushes him. “Be good for me.”
Katsuki’s vision blurs with tears. The alpha’s fangs break his skin, mating them for life. He goes limp, eyes wide, as more tears spill down his cheeks.
He can hear Deku unbuckling his pants with one hand while his other hand keeps him pinned. Katsuki groans when he shoves a spit-coated finger into him. The alpha doesn’t wait for him to adjust. He shoves two more fingers inside, marveling at how the omega’s wet hole sucks him in. He starts pumping them in and out with purpose.
“F-Fuck, Deku. Slow down!”
“You can handle it,” he comments casually, as if talking about the weather. “Kacchan was made to take my cock.”
Katsuki screams when he forces his cock inside.
“Mm, Kacchan is so tight for me,” he groans, forcing his cock into the omega’s wet heat. “It’s almost as if you’re trying to suck me in. I knew you wanted this.”
Katsuki opens his mouth to retort, but a rough thrust makes him cry out. He grabs onto the photocopier, his fingers digging into the sides, as the alpha sets a rough, brutal pace.
“Ah, yes . Kacchan is taking me so well. So perfect and all mine,” he coos, slamming into him faster and deeper. “You love this, don’t you? Kacchan is such a slut for pain. Who would have thought, hm?”
“I-I’m not a slut. Ah, fuck !”
“But you’re mine, aren’t you?” he asks, low and dangerous, speeding up his movements. “I want to hear you say it.”
“Fuck you, knothead.”
Deku gives a sharp, deliberate thrust, sheathing his entire length into his abused, sloppy hole. A painful scream rips from Katsuki’s throat. Deku places a gentle kiss on his neck in a poor attempt to soothe him.
“Let’s try that again.” Deku sighs after some silence. “Maybe I should record your slutty ass taking my cock. What would your boss and coworkers have to say, huh, Kacchan? I think they’d agree that you need to be taught some manners.”
Katsuki starts tearing up again from frustration.
“Fine. I’m yours.”
His tone is flat and unconvincing even to his own ears. The alpha either doesn’t notice or gives Katsuki a pass.
“I’m never letting you go, Kacchan. I love you,” he whispers. “No matter where you run, I will always find you.”
Katsuki wants to laugh, but the alpha picks up where he left off, ruthlessly pounding into him from behind. Katsuki is a wreck. He comes hard, untouched. He shudders as the alpha’s thick cock pulses, filling his ass with spurts of hot cum.
Deku doesn’t stop. He fucks Katsuki through his orgasm. He lowers his head as he sobs from the overstimulation. After a few shallow thrusts, the alpha pulls out. Sinking down to his knees, he parts his ass cheeks, and laps the cum and slick from his puffy hole.
A small whine escapes Katsuki. He tries to twist away, but Deku keeps him pinned in place. As the alpha tongue fucks him, he looks down at the machine. The lights are off. Deku had fucked him so rough that it broke again.
Deku spins him around and pulls him in for a soft kiss. He doesn’t resist, even though he wants to. Katsuki closes his eyes, feeling dazed and disoriented. When he opens them, Deku’s lips curve up and he lovingly strokes his cheek.
This isn’t a nightmare, but he wishes he was.
At some point, Deku moves them to the large windows overlooking the city.
Deku presses his body to the slippery glass. Placing his hands on Katsuki’s hips, he lines himself up. He slots his cock between his ass cheeks, then slowly pushes back into his sloppy hole. It slips in easily without any resistance.
As the alpha starts thrusting, Katsuki is forced to look down at the people underneath them. He groans when Deku reaches around to grip his cock, stroking it in time with his punishing thrusts. Katsuki is the first to come.
With a strangled shout, he splatters all over himself and the glass. The alpha growls in his ear when his ass clenches around his cock, milking him. Deku comes, burying his knot deep inside him. Katsuki sobs and shakes as it rips a dry orgasm from him. Deku pushes deeper, plugging him and locking them together.
The alpha shushes him, murmuring praises as he affectionately rubs his swollen belly. Katsuki is exhausted, his legs about to give out. Deku places a kiss on his temple. He reassures him that he’s going to breed another litter into him.
Closing his eyes, Katsuki resigns himself to his fate. He slowly drifts out of consciousness.