'Izuku's First Knot'

CW: a!Baku, o!Deku, intersex!Deku, middle school, public sex, breeding

Izuku got his first knot a little earlier than most omegas, and in a rather unusual setting. +
Many omegas took their first full alpha dicking during a shared heat/rut with their chosen partner or mate. This traditionally occurred closer to the age of adulthood for the vast majority of alphas and omegas, and it was usually an explicit choice. +
Of course things just /had/ to be different for Midoriya Izuku: quirkless, and now a male omega. He was lucky in that way.

His first heat struck him early, taking him & his mom by surprise in Izuku's second year of middle school. +
He was sure he'd be the school pariah when he returned from heat leave, but he wasn't. For some reason, the other students were staying away from Izuku. +
He was grateful for it until he figured out why.

Kacchan was very intently watching him. And...following him? Why?

His intense presence made Izuku feel a little weak-kneed. +
Kacchan was the only alpha in their class after all. He was the only one who'd presented earlier than Izuku. Everyone seemed to agree that the explosive boy would one day prove to be an Alpha Prime. +
Either way, Izuku wasn't quite sure what Kacchan's deal was. The alpha had actually /growled/ at him a few times.

He stayed confused until Kacchan attacked him the first time, in the middle of class of all places! +
Out of nowhere, he'd leapt over desks only to pounce on Izuku and press him into the ground.

Kacchan used his full weight to keep the omega down, body to body, until Izuku naturally submitted. +
The embarrassment, the pheromones, and the snarling alpha above him had Izuku whining out and showing his neck in seconds.

The large, hard bulge pressed against his rear only made matters worse. +
Their teacher had separated them fairly quickly, but that didn't stop it from happening again and again.

After Kacchan had actually tried to put a claiming bite on Izuku, the alpha had been forced to wear a muzzle and alpha collar. +
Their teacher had a leash on hand and everything.

Izuku himself had been forced to don a thick omega collar as an extra precaution. +
It kept getting worse though. Last time, Kacchan had managed to not only tear open Izuku's gakuran jacket, but he'd ground his clothed erection so hard and fast right against the omega's crotch that he'd actually slicked through his pants. +
Though nothing compared to the situation Izuku found himself in now.

Kacchan had pounced on him again in the middle of class, but this time their teacher had been unable to restrain him. +
The young alpha had his leather lead attached to a bolt in the ground to keep him from getting to Izuku, but he'd torn straight through it in his berserk state.

Now he was on top of Izuku, shredding their uniforms to pieces in order to access the omega's most intimate places. +
"Kacchan, please, stop!" His pleading fell on deaf ears.

None of their classmates could help. They were all rightfully cowering on the sides. Some of them were actually recording the scene on their phones.
Izuku was mortified. +
It wasn't like PDA, or even public sex, was uncommon. But they were only kids, and the classroom wasn't an acceptable place to do this!

It obviously didn't matter to the muzzled alpha above him.

"Nnnnnngggrrrhh, dekuuu," he growled through his teeth. +
Kacchan wasted no time manhandling Izuku into presenting and thrusting two fingers inside his entrance.

"Kacchan, no! I don't want it," Izuku begged as he canted his hips on the larger boy's fingers. +
He couldn't help it! The stretch stung pleasantly and he was so turned on, even if it was just his biology making it so.

"Haaah, no, no, don't go in so fast, don't put in--AH!"

Kacchan had shoved a third finger in without warning, stretching Izuku open in front of everyone. +
Where the hell was their teacher? Did he leave? Izuku hoped he was going to get help.

The omega could feel Kacchan's drool dripping down onto his cheek. His childhood friend was completely lost to his alpha.

"Don't, don't, puh-please don't do it, Kacchan. Alpha." +
Well, that'd been the wrong thing to say. The alpha released a fearsome, throaty roar from behind the muzzle before pulling his fingers free of Izuku's sopping cunt.

"Oh my god," their classmates were chattering in disbelief now, "he's actually gonna fuck Midoriya!" +
Before Izuku could mentally prepare, he felt something /big/ press against his entrance. He whipped his head back, only to see Kacchan's huge, pulsing erection. That was way too big, it would never fit inside him! He couldn't--Kacchan was pressing in!!

"Stop, you'll break me!" +
With one powerful snap of the hips, the alpha thrust in completely, making Izuku squeak loudly.

He was so full, so stuffed full. Kacchan's dick was bigger than all Izuku's heat aids and he was filling up every bit of space inside of the little omega. +
"So fucking tight," Kacchan growled through his teeth.

The alpha began to slowly pull out, each thick inch dragging along Izuku's sensitive insides, before harshly thrusting all the way back in. +
The sound of the omega's pussy slurping on Kacchan's fat alpha cock had Izuku blushing and moaning uncontrollably.

The much larger boy picked up a faster and faster pace until he was brutally thrusting in and out of Izuku's tiny hole, splitting him open in front of everyone. +
Izuku couldn't help his tears as Kacchan's dick drove fast and hard against that good spot inside him before punching his cervix.

The alpha was molding Izuku's pussy to match his huge alpha cock, and just the thought of it made Izuku groan in delight and mortification. +
This thread broke, sorry! Here's the continuation: https://twitter.com/PlushPeachyMimi/status/1330925175966228485?s=19
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