❥ KATSUKI BAKUGOU X FEM! READER
❥ WORD COUNT: 2.3k
❥ WARNINGS/TAGS: a/b/o dynamics (alpha Katsuki/omega reader), knotting, age-gap (Katsuki is in his grumpy 40s, you're in college), he calls you "kid", fucking in a pool, some mention of sex toys, degradation, creampie
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God, he’s too fucking old for this shit. Too god damn tired of the animal that kicks against his ribs whenever the slick smell of a willing cunt passes his nose.
“ ‘m sorry,” you whisper, rolling your hips to suck his cock deeper in your drooling pussy. He grinds his molars at the too-tight feeling.
“Fucking brat,” he hisses and clamps his hands to your doughy ass, jerking you up and down his cock. “Knew you were trouble. Fucking told you to stay away from me.”
Katsuki knew he would end up fucking the bright-eyed and bushy-tailed college girl the day you moved in next door. He tried to stop it, he really did, showing you his teeth and growling any time the sweet stink of your omega scent greeted him.
Yet he’s the one who couldn’t help himself. Humid summer air brought your pathetic smell right to him, had him peeking over the fence that separated his house from yours like a fucking perv.
The sight of you in your little pool, desperate to cool your too-hot skin, bikini bottoms floating next to you as you shoved a dildo into your aching hole was his breaking point.
And now here you are, stuffed full of throbbing, thick alpha cock. Because you begged him, all fat tears and plump pouts as your heat clawed at your insides.
He might be too old for this, but he’ll never get tired of how fucking stupid omegas get for dick.
“The t-toys just weren’t…weren’t good enough.”
You’re pinned between him and the pool wall, lips of your cunt dragging along his length over and over again as you try to find release.
Copious amounts of slick gush from you, making his thrusting easier. Pearly strings of your cream float around the pool, lost to splash of him fucking into you.
But even still, he’s so engorged with blood and hormones ready to knot that his fat cock struggles against your gummy walls. You hiss, not from pain, but from relief, so happy to be full that no amount of stretching will detract from your pleasure.
“You’re fucking pitiful.”
Shame briefly shines in your blown-out eyes, a bit of humanity peeking through the haze of animal instincts. Shit. This is why he hates this, why he’s tried to avoid all the breeding nonsense. Omegas are so emotionally squishy.
Not that he’s any better. One pout from you as you locked eyes with him across the yard made him jump a fucking fence and plunge his cock into your weeping hole at two in the afternoon.
“Just can’t help it, can you, kid?”
Red eyes trace over the body he’s been trying so hard not to imagine. The triangle fabric of your swimsuit is peeled away from your tits, your nipples puffy from how hard you were tugging on them before he got his hands on you.
A little mhmmmm-mhmmmm sounds from lips pressed too tightly together, your head lolling back as you keep bucking against him with your eager, exposed pussy.
You’re a mess, all swollen and gooey and desperate.
“Such a dumb omega,” he groans and wraps his arms around your back, pressing your soft body all the way against his, “fucking yourself out in the open. Wanted me to find you? Wanted the old man next door to fuck you stupid.”
“N-no,” you lie so easily. “Too hot, was too hot and couldn’t get off and—”
“Bullshit. You started splashin’ around out here just praying I’d catch your scent.”
“C-can’t help it, pr-promise. You just always smell so fucking good, alpha.”
Makes sense now why you always seem to be out on a walk when he gets home from work, and why you always seem to need something from him. He was a nice neighbor and gave you his number when you moved in all on your own, a little omega lost in a big college town. You would message him for help around your place at least once a week—changing light bulbs, fixing a leaky faucet, even opening a goddamn jar a few nights ago.
He told you several times to stop bothering him, yet you never could catch the hint that fooling around with an alpha was going to get you bitten.
Relentlessly he pounds his hips, the buoyancy of the water making it effortless to hold you and fuck in deep. His thighs barely feel any strain, his back muscles rolling like a true predator as he starts to use his arms to pull you up and down.
Katsuki slides his fat cock until it’s barely in your pussy, mushroom tip caught by the suctioning ring of muscle inside of you. Then he bottoms out, balls connecting with your ass under the water with a muted thump.
“God, fuck, that’s good, so good,” you’re fucking loud, “feel so fucking good in my pussy.”
“Christ, you wanna let the whole neighborhood knowing I’m fucking you?”
The fuck-drunk little smile on your face tells him that maybe you do.
And he thought he was the perv.
“You’re such a fucking slut,” he whispers furiously, kissing you with so much force it makes your back arch in his strangle hold.
A thick hand wraps around your throat. He doesn’t squeeze, just leaves it there possessively as his tongue forces its way between your lips. You unconsciously moan, your own tongue meeting his, but he presses it down, not wanting it in the way. You give in, letting him encircle your tongue with his own so he can taste you. He pulls back to suck your bottom lip into his mouth, teeth roughly dragging against it.
“Like feeling my cock spread you apart, hm? Maybe I’ll get you a dildo my size for next time you wanna put on a little show.”
You purr and it makes him want to scratch you to pieces.
The burning stretch of your omega cunt is bliss. The smell of sex and chlorine sting his nose, make him lose it a bit and press so hard inside of you that his cock nearly meets the resistance of your cervix. Not that you seem to mind it—your nails are sinking into his wet shoulders, holding on for dear life as he fucks you in the heat of a summer afternoon.
When Katsuki shifts his hips down, heavy cock sliding out of your tight hole, you bare your teeth and growl at a man nearly double your age.
“Easy, tiger,” he tuts and drops you in the warming water, “turn around and let me hit it from the back.”
He loves that your instincts are to obey.
You turn your back to him with an indignant little huff, bending over the edge of the pool and waiting. Katsuki locks his arms around your thighs, pushing up and letting the water do the work. Your legs float open easily, spreading wide as he spears his way back into your slutty hole.
“Ever been knotted before, kid?”
Looking over your shoulder, you shake your head, hiccuping as he works his shaft in and out of you.
“Please, please, ah, knot me. Wa-wanna know what it feels like.”
He’s toying with an ancient fire, he knows that. One fat knot from an alpha and you might be begging to move in with him, but it’s worth it. Your pussy feels too goddamn good and he’s too worked up not to plug you full.
Katsuki works you into an absolute frenzy, waves of water splashing onto the edges of the pool as you mewl and focus on how effortlessly he fucks you. Your walls meld to him, each thrust hasty and claiming, scented sweat steaming from the heat of your body and the blistering of the sun. His dick curves just perfectly inside you, cockhead purposefully brushing against the most sensitive, spongy spots within your depths.
“Surprised none of your stupid boyfriends knotted this tight cunt before.”
“Wouldn’t,” your fingers are gripping the edge of the pool for dear life, like you’re gonna drown any second, “wouldn’t let them.”
“And you’re gonna let me? Just a slut for older men?”
“Slut for you,” you correct him with a bounce of your ass against his pelvis, “love a big, strong alpha.”
He rolls his eyes at the shameless flattery, yet still the ego inside him flares to life.
“Young, stupid omegas always think they can get whatever they want,” he growls, all while keeping a rough pace inside your body, watching how the water parts for the two of you grinding into one another.
You give him a knowing gaze over your shoulder, sultry and coy.
You are getting exactly what you want. All you had to do was get his attention, pry at his most basic instincts and now here he is losing his mind over the tight squeeze of your omega cunt.
Maybe you aren’t so stupid after all.
But he’ll fuck you stupid, he’s sure of that.
“I’m too old for silly games, kid. You have no idea what you’ve gotten yourself into.”
He proves his point by pawing at your belly under the water, pressing in until you can both feel how deep he is in your guts. The realization makes you whine, pushing hard back against him.
“You think I’m just some toy to use during your heat?” Katsuki tuts, licking at one of his canines. “Just wait until I knot this stupid cunt and you beg me to keep coming back.”
A symphony of sex is ringing in your backyard, sounds of primal grunts, shrill little screams, balls slapping against your ass, water gurgling and splashing.
Any animal nearby knows what’s happening, that nature is running its course and you’re both nothing but senseless bodies looking for the simplest relief.
Katsuki slides the hand on your stomach lower, pinching your aching clit before he starts swirling it under the pads of experienced fingers. You start thrashing, cunt sucking so tightly he’s sure you’re hurting with the need to cum.
“Pleasepleaseplease oh god please!”
You shatter and his pride nearly bursts with you. Your cunt clenches, so pleased to cum around a thick alpha cock. You babble absolute nonsense, beg for his knot and a string of thanks yous and pleases and alpha alpha alpha dripping from your mouth into the wake of the pool.
The way your pussy squeezes him tells him you’ve been looking for this orgasm for hours, walls so swollen and pulsing. You must’ve been fucking yourself with useless toys since morning and finally got desperate enough to make a scene and get him to fuck you the way you needed.
“Poor thing,” he coos, watching your cream float to the surface of the water.
You’re totally mindless now as he continues to fuck you, body sloshing in the pool as he manhandles you to take what he wants.
“Don’t even know if you can handle a knot, kid. You’re too tight.”
That stirs you, makes you flatten your hands against the edge of the pool and push back to meet his rhythm. Over and over, you keep up with him, so fucking fraught to finally feel an alpha swell in your guts.
“Please don’t stop, please. Need to feel it, been in heat for d-days.”
“Oh omega, have you been fucking yourself silly with all the wrong toys, hm? Been stuffing yourself all alone in your room? Should’ve, ah, just asked me to come fix it.”
“You told me to stop b-bothering you…”
“You’ll annoy me when your sink’s leakin’ but not when your pussy is? So fucking stupid.”
Only he’s starting to go dumb at the wrap of your cunt around him. The beast in his belly is raging, alpha instincts boiling in the summer sun.
“C’mon, slut, milk my cock,” he pants and slams into you, lost in the way the water reflects around your curves and how your thighs are locked around his waist. He swears your body listens, some reflexive instinct that has your pussy clamping around his shaft until he can feel the veins of his cock squishing into your walls.
The orgasmic build starts rushing up his spine, inflating the base of his cock inch by inch.
“Holy shit, fuck~” you whimper at the first stretch of his knot. “Kat–Katsuki, ‘m so fucking full!”
Finally he bursts, knot bulging into your gumminess until you’re plugged with him. His cum spills into your tight channel, filling you whole.
Your sweet, stupid omega brain can barely comprehend the stretch. Another orgasm wrecks your body, has you falling face first into the pool. Katsuki scrambles to grab you, hoist you up and into his arms as you gasp and crest and cum all over him again.
He can’t help but chuckle, easily maneuvering his back to the pool’s edge. He lets you calm down in his hold, your head falling against his shoulder as you try to breathe.
“Get what you wanted, brat?”
Katsuki pats your bloated belly, making you squeal as he rubs the heel of his hand against his knot.
You nod dumbly, eyes closing to focus on the feel of him. He smirks realizing you’ll never forget him, your first knot. Omegas really are so emotional.
Yet he’s taunted by the stupid bikini bottoms still floating in the water, mocking just how easy it was for you to boil him down to his base instincts.
He’s too old for this shit. Especially as you start grinding down against his knot, cooing, reminding him you’ll be fucking him until your heat decides it’s done with him.
