Alpha!Bakugo x Omega!Reader
CW, MDNI — sexual language, Katsu comes in pants :(, ruts/heats, cursing (duhh its Suki), childhood bestfriends, jealous Katsu, possesive Katsu, scenting
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Alpha!Katsuki who's been your best friend since you were kids. He’s always been protective of you, but in a way that felt normal growing up. Walking you home, little hands intertwined. Making sure no one ever looked at you funny. Picking fights with anyone who did.
Alpha!Katsuki who’s completely thrown when you present as an omega. It hits him like a punch to the gut. You—sharp-tongued, fiery, stubborn as hell—an omega? It doesn’t fit the stereotype he’s been fed his whole life, and it shakes him in a way he hates. Because you don’t soften, don’t suddenly become delicate. Katsuki finds himself spiraling because now his instincts are screaming at him in a way he can barely control.
Alpha!Katsuki who is territorial as fuck and hates it — after all, you were just his best friend right? But you laugh at someone else’s joke? He stiffens. You make eye contact with someone too long? Jaw clenches, fists ball. He knows it’s irrational and stupid. Knows you haven’t done anything wrong. That makes it worse. The rest of the day he’s short-tempered, hovering, touching you more than usual; hand on your lower back, knee brushing yours, arm slung behind you like a warning sign. He never says it out loud, but everyone can feel it: Mine.
Alpha!Katsuki who guides you through crowded spaces. His hand finds your lower back without thinking—big, rough, warm. It’s grounding, calming. Makes you feel safe in crowds of rowdy alphas. If someone gets too close to you, his thumbs hook into your belt loops, anchoring you to him, his breath warm at your ear. Anyone watching would clock it immediately: That is not platonic (but don’t dare to make a snide comment about it to Katsuki — Kaminari found that out the hard way).
Alpha!Katsuki who insists on scenting you before you go out alone. He's awkward about it at first. Tries to play it off like it’s practical. “It’s for your safety. Just c’mon.” When he leans in, it’s slow. Thoughtful. His breath ghosts your skin, the smell of caramel and smoke overwhelming your senses. He drags his wrists against your neck. It's purposeful, almost sensual. You feel yourself relaxing, knees weakening beneath you. When he's finished, his hand lingers a few seconds longer on your neck. “You’re covered,” he mutters, voice rougher than before. He’s proud of the way you go about your day smelling like him.
Alpha!Katsuki who has no idea how significantly your first heat will affect him. He could sense your smell getting sweeter the past few days so he decided to swing by your apartment to check on you. When you don't answer the door, he comes in using his spare key.
He finds you curled up in your closet in a pathetic, messy pile of his things — hoodies you've stolen over the years, t-shirts he’s grown out of, an old blanket from his dorm.
"Oi," he calls, his voice low and rough.
"Go away," you gasp, but it comes out as a broken sob. "Katsuki, please, you can't be here."
When he steps closer, you scramble back, pressing yourself into the furthest corner of the closet.
"Fuck," he breathes, "This is bad, isn't it?"
You can't answer. You just whimper, burying your face in a pillow that smells like him. It's a mistake. The concentrated scent only makes the heat between your legs hotter. Your hips rock against your will, a pathetic, desperate motion.
"Katsuki, leave!" you cry, embarrassed beyond belief.
His fists are clenched at his sides, knuckles white. He wants to be a good friend, he really truly does. But his alpha is screaming at him to take, to claim, to soothe the pain with his body.
As your hips continue to grind helplessly against the pillow, his brain short-circuits. All his careful control, slipping. The image of you surrounded by his things, falling apart in front of him has his cock growing impossibly harder.
He can feel the overwhelming constraint building. A hot, heavy pressure that demands release. His rut. It's not coming. It's here. And you triggered it.
"Fuck," he chokes out, his voice strangled. He squeezes his eyes shut, but it's too late. The pleasure coils in his gut, hot and fast. He can feel his balls draw up, his hips jerking in a tiny, helpless thrust into empty air.
It's a violent, overwhelming orgasm that rips through him with zero warning, soaking the front of his gray sweatpants in a hot, messy rush.
It's humiliating. It's mortifying. Utterly pathetic. And it feels so fucking good that his vision whites out for a second. He rasps, his body trembling with the force of it.
Shit, he can't stay. He has to leave. If he stays for one more second, he's going to do something he’s worried you’ll regret. He stumbles back, his movements frantic, doing everything to not look at you.
"I gotta go," he bites out, his voice rough and ruined.
“No. Stay,” your voice is decisive. Strong.
“It hurts Katsu,” you beg. “Need help. Please”
That's what does it for him — his leash of restraint snapping.
He crosses the space between you in a single stride, dropping to his knees before you.
He doesn't touch you at first. He just crowds you, his scent overwhelming you.
"Look at me," he growls, his voice a raw command. “You want my help?”
When you don't answer, he hooks a finger under your chin and forces your head up. His eyes are burning, pupils blown wide.
“Use your words,” he rasps.
“Yes. Yes, want you,” you whine pathetically.
The rest of his restraint snaps, pinning you down beneath him.
"Gonna fuck you 'til you can't remember your own name," he promises, his voice a dark, velvety threat. "Gonna knot you so deep you'll be stuffed with me for days. Gonna make sure everyone knows who you belong to. Forever. Now, are you gonna be a good girl and let me take care of you?"
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a/n: hehehe sorry to leave u on a cliff hanger ;) if anyone wants a continuation of this let me know and i will deliver (˶ᵔ ᵕ ᵔ˶) xo, vivi
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