Thread by @sweet_n_fiction

#bkdk #ktdk Pleasant Surprise (Comm Piece)
[tags: pervert Izuku, underage, QL!Izuku, A-B-O, unisex Izuku, slutty Izuku, smol pp Izuku, PH!Katsuki, rough sex, breeding kink, vaginal + anal sex, mpreg]
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In all honesty, it was very much the sort of painful sweet torture that Katsuki Bakugou deserved. For being an utter shithead to Izuku growing up, despite knowing deep in his heart that he wanted to be with him.

Like he expected the boy to just shrug everything off and then be ready for Katsuki when the blond finally pulled his head out of his ass.
Of course it wasn’t going to be that easy, and Katsuki realizes he didn’t deserve that anyways.

The world wasn’t going to pause and wait for him just because he wanted it to. Reality had a sense of humor, and that showcased itself with Izuku Midoriya presenting as an Omega in the middle of class.

He’d already had strong inclinations of himself being an Alpha, but smelling the sweet sin that was his Fated Omega’s slick and pheromones threw him tumbling head first into rut. Fangs throbbing painfully as they fully dropped and venom filling his mouth.

In a blur of motion Katsuki was fighting off other young Alphas that presented at the scent of a pure Omega. As soon as he reigned victorious, he was shoving Izuku into a presenting position and mounted him.

Whining and crying in mind melted pleasure as his sensitive cock plunged into silky wet heat.
The teacher ushered everybody out of the room as Katsuki whimpered and growled, pounding desperately into his Omega.

When his knot popped, caressed by the throbbing walls of his Omega’s tight cunt, he lunged forward and sunk his aching fangs into the flushed scent gland. Sealing them together like fate designed.

When he finally came back to reality, he was in Izuku’s room nestled deep into the Omega’s frantically made nest and feeling like a million dollars. Izuku chirped and trilled delightfully in his arms in his sleep, and Katsuki knew he’d do anything for him.

First of which was enduring his mother’s wrath as she smacked him six ways till Sunday while yelling at him about mating and bonding Izuku before courting him properly. Inko and Masaru were just glad that they were together.

Katsuki was no bitch, and definitely not a fucking coward. Though he was still reeling from the new instincts from being freshly presented, and his grip on his emotions wasn’t the best, he vowed that he was going to woo the fuck out of Izuku.

“You better prepare yourself dork!” Katsuki yelled because that’s all he knew how to handle his emotions, even as his face was bright red. “I’m going to be the best fucking Alpha there ever was! You’ll never want for shit!”

Izuku stood there on their impromptu picnic date that Katsuki had dragged him to in the middle of the woods they used to play in, blinking in surprise. Then his cheeks started to turn a pretty pink as the scent of pleased Omega circled Katsuki.

There were practically hearts in his eyes, as Izuku giggled, gripping his new Omegan dress his mother bought him. “Mmm, okay Alpha.”

With that, he lifted the skirt to show that he wasn’t wearing any underwear, and his tiny little Omegan cock and pussy were shining wetly, slick already dripping down his creamy thighs.

Once Katsuki got over his need to scream in embarrassment he quickly mounted Izuku and pounded into him with desperation. If only Katsuki knew the monster that would awaken in Izuku once he’d gotten a taste of sex, and what was to come.

Because Izuku became ravenously insatiable, and a demon that haunted Katsuki at every corner. He loved his Omega to the heavens and back, but that damn bratty slutty Omega was going to give him a heart attack.

He was an absolute angel to everyone else, the model fucking Omega with pretty pastel clothes, a soothing sweet scent, and perfect manners. When it came to Katsuki, his Fated Alpha, he was a goddamn menace.

A little sexual deviant that took what he wanted when he wanted it.
Katsuki was convinced Izuku had a fixation on almost getting caught. Because at any opportunity at all, the Omega would get a glint in his eye.

Like a devilish little succubus, and before Katsuki knew it, he’d be flashing that pretty pink pussy and tiny cock at him.
The minx never wore underwear anymore, and it drove Katsuki up the wall with lust and adrenaline.

He felt like he was going crazy with worry that Izuku would get caught, but he was always moments away from popping a knot from how hard he’d get.

Izuku also found a deep love for jacking Katsuki off whenever there was any sort of cover. They sat side by side at the back of class after they bonded, given their mate status, and Katsuki would eventually feel Izuku’s little hand reaching over to cup his cock.

It was pure pleasurable torture as Izuku would diligently take notes with one hand, and rub Katsuki off with the other. Leaving the Alpha struggling not to whine and let his eyes roll in the back of his head. Biting down on his hand when he orgasmed in his underwear.

Naturally this would lead to Katsuki snarling and shoving Izuku over the toilet during break before pounding him into submission. He liked to pretend like he was the one in charge, and that he was punishing his naughty Omega.

Though he knew for a fact that none of it was punishment for the little slut he was Fated to.
Izuku fucking loved sex.

Katsuki actually feared for his cock, knot, and balls. Honest to god stayed awake one night wondering if there was such a thing as too much sex. Because holy fuck did it feel fantastic, but he felt like his balls would run dry eventually.

It of course didn’t stop him from bending to Izuku’s will every single time.

Which led to Izuku being even more daring. In the brief moments they’d have alone at family dinner, Izuku would quickly bend over and hold his pussy open for Katsuki to see before resuming to be the perfect little polite Omega.

Or he’d grab Katsuki’s hand and pull it under his skirts. Rubbing his little Omega cock against it before letting him go and skipping off. Leaving Katsuki with a shiny palm full of slick.

As they got older and their bodies matured, Izuku had fun teasing Katsuki with his new developments. Like the fact that he was growing small little Omegan breasts. Plump and fatty, but nothing bigger than an A cup, maybe pushing B.

They wouldn’t get that much bigger without him getting pupped, but they were still hot as fuck.
Izuku’s new favorite thing was to flash Katsuki his tits.

They were in high school at this point, both of them attending UA. Katsuki was in the Hero Course, and Izuku was in the Support Course.

He was very specifically Katsuki’s Support Engineer, which meant they saw a lot of each other throughout the school day.
Which meant Izuku had plenty of opportunities to be a horny little bastard.

The fucking idiots that pushed their way into his life and called themselves his friends eventually caught on to the fact that he was mated. Given that he lived in the penthouse suit of their dorm building.

Once they used their one shared brain cell to piece together that it meant Katsuki’s mate ALSO lived in the dorms with them, they were on a manhunt to find out who was mated to the surly gruff Alpha.

They loved Izuku immediately, because everyone loved Izuku. Sweet, innocent, kind, genuine, loving Izuku. The perfect Omega. Katsuki’s adorable little nightmare.
They took to him like fucking ducks to damn water.

If Katsuki didn’t know that Izuku was actually a really sweet and sincere person, he would have thought he was a conniving villain about to take over the world with his cuteness. Because no one could possibly be as genuinely nice as his Omega.

He knew better though. Izuku was an angel with a sinful side. So it didn’t take long for Izuku to start up his shenanigans in the dorms once he was familiar with everyone’s habits.

Katsuki was keenly aware that Izuku would never actually get them in trouble. His Omega would kill over dead before he did anything to hurt Katsuki’s career. So he was careful, meticulous, and smart.

That didn’t mean Katsuki still didn’t have a damn heart attack though when Izuku would giggle and then flash him his lubed up tiny pink asshole.

He’d recently really gotten into anal when he discovered that he wasn’t only limited to just getting his pussy fucked. Katsuki wasn’t gonna complain, fucking Izuku’s tight little ass. Not only that, the Omega started practicing how to deep throat Katsuki.

He’d given Katsuki very pleasurable blow jobs plenty of times before, but he was trying to get better. Enough that he’d have Katsuki blowing his load in seconds. In return, Katsuki was upping his pussy eating game too.

Suckling on Izuku’s cute little Omegan cocklette while tonguing his clit and fucking his pussy.
They were a monstrously sexually compatible couple needless to say.

In fact, Katsuki had gone nearly every single day with at least ten rounds of sex, so when he went on the hero exercise field trip to the Wild Wild Pussy Cats training grounds WITHOUT Izuku…it was like pure murder.

If he thought Izuku being a little demon was his life earned punishment…this was hell.
It felt like his skin was itching, his Alpha snarling like a caged animal, balls so fucking blue.

“Bruh, calm the fuck down please.” Kirishima begs one night as Katsuki snarls at Denki for even trying to snag some of his food. It’s feral and satanic the way he barks and growls at the poor Beta. “You’ll see Izuku soon man. Y’all even talk every night bro!”

He was like a rabid wolf. Pacing the confines of his cage and hissing at anyone who gets too close. It gets to the point that Aizawa looks ready to full on strangle him to death.

Even when All Might dropped by to check on their progress he was bitter that the famous hero hadn’t even THOUGHT about bringing Izuku with him. He was becoming very fatherly and protective over the Omega, so what the fuck gives?

When they finally get back to campus, everyone looks as ragged and worn down as Katsuki feels. It’s to everyone’s relief when they pull up in the bus at the dorms to see Izuku waiting there deligently like a good Omega.

Katsuki barreled his way off the bus, probably even knocking Aizawa down as he stormed out. Running straight into the arms of his beloved Omega.

They’re inseparable, and everyone knows it. An indisputable fact even as they grow into adults and Katsuki becomes a Pro Hero. If there is ever one thing to be said about DynaMight, it’s to never ever ever ever ever ever ever ever ever ever EVER touch his Omega.

Not that anyone would want to. Besides the completely guaranteed death sentence, Izuku was an absolute sweetheart adored by all. Even some of the most dastardly villains would take a complete pause before ever even considering hurting Izuku.

So many had even joined rehabilitation programs after speaking to the Omega.
Though none of them knew that Izuku never grew out of his favorite hobby of torturing Katsuki at any given chance.

TBC pt.2