Thread by @the_bara_king

#BKDK AU Alpha!Deku Omega!Baku

After Deku found Bakugou in a mess of slick in the locker room, Deku had been worried why Bakugou hadn't returned to the dorms, they had mated right then after going delirious from Bakugou's delayed first heat. Deku lost all sense after seeing-

Bakugou slumped against his locker, black tanktop pulled up and caught behind his tits, pink nipples swollen, thick muscular legs open wide, his feline-like face red and miserable with lust, his pussy sloppy while getting fingered with two battle toughened fingers, and a dense-

Fog of sweet cinnamon pheremones that made every nerve and instinct in Dekus body neon flash the words "ONE TRUE MATE NEEDS YOU" in his mind. Both green eyes and red eyes were glazed over with desire, Bakugou raspily keened as he saw Deku stripping like a man on fire before him,

Kacchan's brick house body trembling in primal anticipation, Deku hurried to drape his body over Katsukis and fumble for his stout thick cock to hurriedly enter his mate immediately. Katsuki could only painfully murmur in his husky voice, "fuckin hurry, need alpha, need deku"

Deku nuzzled his scent gland over Kacchans gland clumsily, rubbing it over and over while murmuring "Kacchan, my omega, my kacchan" to soothe his agonized mate as he started to stuff Katsuki's ready virgin pussy. Deku groaned and nearly growled at the wet vice grip on his cock -

Katsuki boyishly whined and dug his sharp clipped down nails into Dekus freckled shoulders. They were forehead to forehead gasping in their mixed pheremones that nade them feel like they'd stuck their head in a fireplace and taken a deep breath in. Even felt like their bodies-

Were burning too. One thing led to another and Deku found his knot deeply lodged in Kacchan, pumping what felt like were gallons of steaming doses of cum into the blondes womb. Deku had finally regained sanity, looking at his estranged childhood bestfriend heaving flushed beneath

Him, katsukis stomach seemed to be covered in multiple orgasms worth of the blondes own semen. They found eachothers gaze and Bakugous cheeks and ears and neck could not go a deeper shade of red. "Get the fuck out of me shithead!" Katsuki gruffly shouted in Dekus face,

"Ow ow I cant Kacchan sorry wait just wait ow im knotted! Just wait a sec! Sorry!" Deku went back to what he remembered hed done before, bending over to rub their sweaty necks together to calm down his fiery omega. Bakugou first barked, "what are you going NOW Deku- ..."

Bakugous body goes slack again, breathing in ragged deep breaths, humming in peace as his alpha comforted him.

And so. Deku got Kacchan pregnant. No one had even known Kacchan was an omega. Kacchan hadnt been ashamed, hes just always been private about everything. Hell,

No one even knows what his room looks like. Not even his best friend Kirishima. But the dots were all linking tigether in Dekus mind as to why he could never stop following and thinking about Kacchan since they were kids. Why Mitski would never let them sleep in the same bed

Once Deku had presented. Why Kacchan was even angrier at Deku, meaner to Deku for being quirkless, for not being a strong enough Alpha as kids. Deku felt a fierce protectiveness ever since he could remember for Katsuki. From the slime monster, from the damn league of villains,

There was nothing he wouldnt do to make sure Katsuki would always be safe and under his sights, he would die for Kacchan. And now, he would die for Katsuki and their pups.

Katsuki was hard to deal with before, but being 18 and pregnant was... a serious challenge.

He was pissy 24/7 for having training limits put on him by the teachers to make sure he wouldnt hurt himself or the pups. Katsuki never even hinted he had wanted an abortion so everyone knew that he actually wanted to bear Dekus children, even though he loved complaining about

"Im strong enough to train more, dont fuckin look down on me extras! My pups are probably already stringer than any of you right fucking now!" Deku would always gently guide his blood thirsty pregnant omega away from the friends that had expressed any worry when

Katsuki was far along and still practicing like a mad man, focused to still be the no.1 hero. Deku would take Katsuki back to the locker room, listen and nod to Katsuki grousing as he showered,Deku eyeing the tight with muscle bulge protruding belly his omega was already sporting

With a proud smile. "What the fuck are you smiling about, creep?" Katsuki asked him as he dried off and started dressing in stretchy grey sweatpants and a black t shirt. Dekus blush burned as he laughed nervously and said "nothing nothing, lets go back to your room."

Katsuki had converted his red and black minimalist bedroom into a giant nest, sprinkled with different articles of clothing he'd steal from Dekus room without saying anything. Deku loved finding new things Katsuki has snatched whenever he comes in. Although he wanted to keep

Training himself, he could never not be in the same room as Katsuki now. He didnt know he could be so possessive till Katsuki got pregnant, but here he was, following Katsuki to his nest and holding both his and his mates study materials in his arms.

It was hard to give Katsuki's affection, he had to put up with pain to gain, which most cat owners can understand. While studying at his desk, Deku came behind to deeply inhale his omegas scent, circling his arms around his mate lovingly, his chin hooking over his cranky mate's

Shoulder sweetly. Katsuki startles and snaps, taking a painful fist of Dekus hair and yelling "im trying to study, shitty Deku." He lets go once Deku whines, "Ow Kacchan, im just looking. You're so smart so I jsut want to peek at your notes is all..."

"Hmph. Whatever, nerd. Just dont fucking mumble like you always do, its distracting as hell." Deku hums in acceptance and does his routine nuzzling to make sure his omega is properly scented. He could only go a few hours before the overwhelming urge to scent his pregnant mate -

Would overtake him. Katsuki would complain everytime, but would never actually physically try to make him stop. If Deku did it long enough he could catch Katsuki purring in contentment. Kacchan still wasnt mate marked, which was the main source of the problem. He was so damn

Stubborn, Deku couldnt understand how he could be Pregnant with his child but refuse to be marked. It was the main cause for his abnormal possessiveness, hell, he even growled at omega friends like Uraraka or Kaminari when they got too close to Kacchan.

He noticed Katsuki had stopped writing notes, or flipping pages, leaning back into Dekus embrace with heavy breaths in and out of his nose. Dekus voice went deep with want, rich heat spreading across his chest and to his cock.

"Want to go to bed, Kacchan?"

Katsuki didn't say anything, but stood up, laid in bed, dazed red eyes glaring at Deku to lay behind him in big spoon. Deku makes a small hopelessly smitten smile, and slowly slips in bed behind his grumpy omega. His hands already wrapped around Katsuki and rubbing gentle

Circles on top of Katsukis big belly. He presses hot kisses to Katsukis neck, relishing the warm moans of his mate, and gets up to straddle his pouting horny Kacchan and pull up his omegas t shirt over his chest.
Deku leans down to take a mouthful of swollen pink nipple and

Groans when he tastes his omegas sweet fresh milk and hears Katsuki whimper at the pleasure of being nursed. Dekus dark green eyes gaze strongly up at Bakugou, who bites his lip and gulps while failing to glare down at Deku.
"Ts for the babies, Damn Deku..."

The statement makes Deku so hard he almost cums in his boxers, his knot already forming. Thats right, Kacchan really was going to bear his children, this isnt all just a fantastic dream. Deku lets the nipple out of his mouth with a lewd pop, and leans up to fervently kiss his

Omega, his kacchan, while softly holding Katsukis jaw. Katsuki relents, kissing Deku hotly and passionately, biting Dekus lip Hard and looking up through blonde eyelashes as if to say "Keep going."

Deku lips his sore lips and grins, going back to suckle at Katsukis leaking tit and pulling down baggy sweats with one hand. He gasps when there is no underwear, mumbling "Kacchan.. you didnt wear underwear?"

"Shut the fuck up Deku!" katsukis hand finds a place in Izukus messy green curls again, urging him downwards. Deku takes the hint and completely slides iff the sweats and enjoys the vuew of his muscular omegas pink slick pussy. Little patch of pubic hair crowned on top.

Deku grabs both steely thighs with scarred big hands, and dives down to lap hungrily at the sugary juices pouring out of Katsukis hole, enjoying the sensation of those solid brutal thighs clamping around his neck as he sucks at the clit happily. Deku cant wait any longer and

Takes his angry cock out, panting, face serious, looking down at Bakugou's strangely submissive expression. Kacchans chest and cheeks burn, harsh eyes half mast and lips pinching into a pout with how direly he wants his Alpha to claim him. Deku slides his cock into Katsuki,

Savoring the tightness, so happy to mate with his pregnant omega, careful not to put any weight ontop of Bakugou. Katsuki mewls in satisfaction, eyes rolling back in his head, legs spasming with his joy, he starts to singe the pillow he is holding onto as he cries out.

Deku changes position, spooning Bakugou, pushing his dick in with a happy sigh from Katsuki, and suckles his omegas scent gland while fucking Bakugou from the back rapidly. Earning a whine from the blonde every time his balls slap against the omega. Deku almost thinks he's

Hallucinating when he hears a quiet,
" Mark me."
So he just keeps slamming into his mate again and again till he hears it again, louder, more sure, and with a hint of annoyance, "I said, Mark me Deku."

"...Kacchan.. are you sure?" Dekus thrust stutter and slow, delight showering through him like golden confetti. "Yes." Kacchan returns, even more quietly this time. Deku starts pounding into Katsuki then, both of them moaning shamelessly, and they both cum when Deku's knot is

Shoved and locked deep in Katsukis pussy and Dekus fangs sink into the side of Katsukis tan throat. Bakugous jaw tenses, a whole body shiver and curled toes as he shouts his orgam through clenched teeth. Both of their vision going white. Then they laid there, izuku smiling

And cuddling Katsuki in the nest like a clingy puppy, and Katsuki smirking as they lay together in bliss.

End.