What if alphas and omegas with uncommonly large knots/knot-taking thresholds were paired up? tThe fatter an alpha's knot, the smarter, more productive, and generally superior their genes are.

However, most omegas can't take those big knots, leaving these virile alphas cranky and aggressive and unable to properly knot without severely injuring the average omega.

When an omega is discovered to have great enough elasticity to take one of these alpha's knots, they're automatically enrolled in the government's program. "Plus Alpha... For alphas... with just a little bit more."

The program is great for alphas because it allows them to fuck.

It's great for the omegas with excessive elasticity because it satisfies them in ways no normal knot can.

And it's good for literally everybody else because alphas who can't let off their sexual frustration are terrible, and the bigger their knot, the worse they are.

Terrible teen alpha Katsuki has the worst temper and one of the biggest knots the doctor has ever seen, and the only medicine for the aggressive 17 year old would be an omega with a pliant enough hole.

But when the doctor checks the database, theres no omega who can take him.

How lucky for everyone when that very week the doctor meets mousy omega Izuku.

The freckly 13 year old just recently presented and his heat was absolute torture. None of his toys could satisfy him, so he was in excruciating pain the whole time.

Tears pricked the mother's eyes. She couldn't stand the thought of her baby in such pain. She had to listen to him scream and cry through his whole heat. The doctor nods sympathetically, asking if he can test the omega's elasticity.

The doctor gives Izuku a sheet to drape over his legs, and he slips his pants off beneath it. Inko remains seated in her chair, eyes averted as the doctor inserts the instrument in the omega's hole and begins to pump it.

And pump... and pump... and pump...

The doctor goes way past the normal range and the omega still doesn't seem to give much response. Until the omega begins to pant, drool dripping from his mouth - not in pain but pleasure.

The tiny omega moans as the doctor continues pumping up the fake knot, getting closer to max capacity. He can see the omega's tiny cocklet tenting under the sheet.

When the doctor reaches the knot's max capacity, the omega is whining and babbling unintelligibly, tiny cock spurting to wet the sheet covering his modesty.

Incredible... but the doctor had to be entirely certain.

With his gloved hand, he wriggled his fingers at the omega's rim the two tips were able to pop in beside the fake knot, earning another whiny moan from the omega. The doctor smiled down at the blissed out omega, pleased he would have something good to report to the Bakugous.

He'd found the perfect omega for their unruly son. Young Katsuki could certainly safely fuck his aggression out on this omega... and the tiny thing could take it, /needed/ it if the pains of his first heat were any indication.

The doctor informs them that he would be adding izuku to the Plus Alpha database, much to Inko's discomfort. Telling them was just a formality, though. The doctor already knew exactly which alpha was getting the tiny, freckled omega.

He called up Mitsuki Bakugou the next day and told her he was mailing her a file on the omega he'd found for Katsuki. The doctor sent the package promptly.

When katsuki heard, he became incredibly agitated and antsy.

Pacing around the house and growling, eagerly awaiting information on the omega the program promised to deliver him.

His mother was supposed to sign for the package, but Katsuki was so intimidating, aggressive to the mailperson that they gave it directly to the young alpha.

Katsuki rushed back to his room, tearing into the file full of confidential information an omega had no choice but to divulge once they were added to the database. "Izuku Midoriya..." Katsuki read, staring down at the medical file.

Thirteen, male omega, newly presented, and the knot capacity... just enough to take Katsuki. He could feel the beating of his heart in his ears, and he turned the page over only to find a photo of the omega. Recent. Just taken the other day in the doctor's office.

It must've been after the exam. The green-haired thing was all flushed, eyes wet and puffy, with freckles dotting his cheeks. The little omega looked so delicate... so pretty...

...so... so... so /cute/.

Katsuki wanted to bend him over and make him /squeal/, make him fucking /cry/ just like in that photo... No, worse. He could feel himself salivating at the thought, hands tightly gripping the file and creating a crinkly noise.

He reached back into the envelope, wondering what that sound could possibly be, only to find a plastic bag with a medical glove enclosed inside.

As soon as he opened it, he was hit with the most intoxicating scent that widened his pupils and firmed up his cock.

This... this glove must be from the exam. Katsuki stumbled back to land on his bed, tugging the waistband of his sweats down to free his tremendous prick that was growing uncomfortably erect.

His tongue lapped at the glove, not caring at its staleness or the fact that it'd been on the doctor's hand. He had to have all of it. The taste was just too amazing to ignore.

His other hand smoothed over the length of his cock, large hand not quite big enough to wrap around his great girth. He reached over to rifle through his night stand, searching desperately for...

Ah, there it was. He brought the device over to his cock.

It was a fleshlight, but not just any fleshlight. One made special, just for Katsuki's cock. Specially crafted by alpha sexual health doctors for his uniquely large cock, for his voracious alpha appetite, and for one of the largest knots out there.

As much as katsuki appreciated the device, how wet and warm it felt, how it undulated and vibrated around his cock, sucking at his skin, it still didnt satisfy him. He knew it was only a stand-in until they found him an omega.

And they did find him one. That... that deku kid.

His cute little fucktoy.

Soon.

So soon.

Katsuki let his eyes flutter shut as he stretched the device over his cock, swallowing him up and massaging his length all the way down to his swelling knot. He could just see it in his mind.

Pretty little Deku all blushy and teary underneath him, just like that photo. /Fuck/, he probably moaned like a bitch, too. Katsuki could... fuck, he could /knot/.

And he did. But it wasn't with that resignation or hopelessness he usually had. No, Katsuki was happy.

Not a day later, Inko Midoriya receives a letter in the mail informing her that her son has been assigned to an alpha. There is no file on the alpha, no picture like the one included for the alpha to peruse.

All she gets is the name and age of the alpha (Katsuki Bakugou, 17), the date, and the time she is required to bring Izuku to meet him. The alpha had already accepted Izuku as his Plus Alpha partner and he and his family wanted the two to meet as soon as possible.

Inko was dreading having to tell Izuku, but it was only within a few days. Her son was already shy and uncertain, going through so much, and now he had no choice but to become a... a plaything to an older alpha? Still... Inko could do nothing but tell him, so she did.

She could see how anxious he was as soon as she told him. Who was this alpha? What did he look like? Why couldn't he just get medicine or a special toy or something?

But Izuku was an omega, and Katsuki Bakugou was an alpha.

An incredibly powerful one, from a strong and well-connected family, and he wanted Izuku. So Izuku had no choice. The letter instructed for izuku to be dressed in loose-fitting clothing for the meeting, no using scent blockers or taking suppressants the day of.

The latter was simple enough, since the doctor wouldn't even prescribe them after adding Izuku to the database. Plus Alpha omegas had to defer to their assigned alpha's judgment on whether they could use blockers, heat suppressants, even birth control.

Izuku wore a long and fluffy sweater and some dark, dark soft leggings, and some slippers. His mother told him he should be comfy for the meeting.

It was harder being comfy these days, with how his body was changing so fast, how his hips and thighs were becoming thicker, cushier, how his chest felt tender, and how his hole would become wet with no regard for timing or his feelings.

And now none of that would even matter anymore, because this Katsuki Bakugou person would be in charge of him.

They arrive at the meeting location a bit early.

The program hosts them at a special center, with comfortable scent-locked rooms that allow the alpha and omega to meet in relative privacy. Cameras allow Plus Alpha staff to supervise the encounter, to make sure everything goes smoothly and safely.

Although the program boasted a great success rate, there were still dangers. Sometimes an omega becomes so anxious or frightened that they have to be subdued with medication so they don't fight the alpha.

On rare occasions, they have to intervene when an alpha becomes too aggressive or violent, but this almost never happens. After all, the /point/ is for the alpha to let his aggression out, so it'd have to be very severe for them to interrupt.

Izuku wasnt entirely sure what to expect from this. He knew almost nothing about the alpha assigned to him and even less about what was going to happen to him. He wished he'd never gone to the doctor, but now, it was too late to do anything about it.

"Ms. midoriya," a representative called as the two stepped into the office. "Ah, and i see you have young Izuku with you. Perfect. Please, come this way."

The two silently followed the beta woman as she led them down a hallway.

"Both you and your assigned alpha will be entering the room through different chambers. We allow the omega to enter first to get comfortable with the environment. We know how you omegas can get a bit sensitive in new places," she said, smiling at Izuku.

The way she said it made him feel small, but he only smiled and nodded. The three of them entered through a door only to be let out in a cylindrical chamber. "You'll be going through that door, Izuku," she said. Izuku felt queasy.

"I... my tummy hurts," he said, hands fidgeting with his knitted sweater.

"Oh, I know this can be pretty scary," she affirmed, turning around to open a tiny refrigerator next to the wall and snagging a can from it. She handed a ginger ale to Izuku.

"But I promise you, this will be a good experience. The bigger the knot, the better the alpha. And the alpha you're meeting has a very. Big. Knot." This, unsurprisingly, did not make izuku feel better. Instead, that anxiety just surged more inside of him.

But he couldn't protest, he could only listen and do as he was told. "Step right through here, dear," she said, opening up the door into the room and ushering Izuku through but careful not to touch him.

As soon as he entered, she shut the door tightly behind him, leaving him alone in the bright and open space.

One wall was entirely windows, looking down at the city below them. They were many flights up, high up in the air, and seeing outside as at least a nice distraction.

The walls were entirely bare, save for some mirrors. Looking in the mirrors made Izuku nervous though, so he tried to avoid them.

In the center of the room, the floor dipped down several feet in the shape of a giant rectangle.

Izuku padded closer to inspect it, admiring the countless plush pillows piled within it and the soft looking blankets neatly folded in it. Izuku had never seen anything so comfy looking before... even in such a strange situation, seeing it made him feel a bit safer.

Especially considering it was all unscented. There wasn't a single smell in the room. Just izuku, meaning he could use the pillows and blankets without feeling like he was stepping on anyone's toes.

Izuku hopped down into the space, realizing as the pillows and blankets gave underneath him that the pile went deeper than he expected.

The knowledge filled him with a happy warmth as he fell to his stomach and began to snuggle his face into the pillows and blankets, relaxing his glands and liberally scenting the giant nest.

He rolled about, making sure to scent every soft thing he could find on top before he began to burrow under the blankets and pillows, digging deeper into the nest. Izuku was so warm and cozy, and scenting all of the blankets was making him so drowsy.

His scenting gradually slowed as he tired, and Izuku didn't even notice as he drifted off into a peaceful nap, buried underneath all the pillows and blankets in the great big nest he'd scented as his own.

Behind another door, Katsuki and his parents waited with another representative, watching Izuku on a screen. "Aw," the representative cooed. "The poor thing must have been tired. Looks like he's gotten nice and cozy in that little nest there. I can't see him at all anymore."

"How will you know what's happening?" Mitsuki asked.

"Oh, don't worry. We'll be able to see then." Mitsuki silently pursed her lips, and Masaru wrapped a comforting arm around her. The pair were uneasy.

Katsuki, on the other hand, was brimming with excitement.

He could feel electricity buzzing through him just knowing his omega was in the next room just waiting for him. Fuck, the thought had him salivating.

"Now, Bakugou, some things you should know," the representative began.

"Omegas can get quite skittish in there when meeting their assigned alpha for the first time. It can be a very positive bonding experience... or in some cases, quite a traumatizing one.

We find that the better this first meeting goes, the more satisfied an alpha is with their overall relationship."

"Does this have a fucking point?" Katsuki growled, sick of the woman droning on and on. He didn't need a lecture. He just needed in to see Deku.

"Hey!" mitsuki yelped, jabbing a finger in Katsuki's face. "You better fucking listen to her, brat, because if you fucking break that poor boy you're not getting a new one. You hear me? That's a person in there, and you're gonna learn how to treat him right. Understand me?"

Katsuki snarled but ultimately relented. "Fucking whatever, hag. He's my omega. I can do whatever I want."

"You do whatever you want and you'll see what happens, brat," Mitsuki threatened, turning to look at the representative. "Please continue."

"Y-yes, well... naturally, omegas don't quite like mating upon first meeting, so we warn against it. But of course you're free to do as you like," the representative explained. "Considering Midoriya's current state, i would recommend starting off by scenting."

Katsuki liked that idea. He already wanted to rub his scent glands all over deku, make him reek with Katsuki's offensive alpha pheromones, let everyone know Deku belonged to a strong alpha.

"Scenting?" Masaru asked. "That seems kinda fast."

"Oh, not directly," the representative assured. "First, I recommend releasing pheromone in the room. Then I recommend approaching the nest and slowly and carefully withdrawing and replacing items after scenting. It's important to slowly introduce your scent.

The blankets are good at filtering scent through. It'll get Midoriya familiar with your scent. Then you can probably enter the nest and begin scenting the inner layers. Very carefully.

Sometimes omegas are receptive to this when they wake up, but other times when they wake up too soon they're very distraught."

This all seemed simple enough to Katsuki. So he just had to go in there and familiarize Deku with his scent, show him it's not scary.

"And if he does wake up and gets freaked out? what then?" Mitsuki asked.

"We recommend backing up, giving the omega space. It can help to offer a gift to try and calm them." The representative turned to a cabinet and retrieved some wrapped pastries, handing them to Katsuki.

"We find sweets are very effective at calming distressed omegas. It helps them feel safe - provided for." Katsuki took the sweets from her.

"Yeah, yeah, that it now?"

"Sure is!" the representative confirmed. "unless you have any other questions for me?"

"Fuck, no," Katsuki grumbled.

"All right then. Your time starts now. We'll ring a bell when time is up. Alarms mean stop."

"All right already," Katsuki groaned, "Just let me the fuck in. I've been waiting for days."

"So eager," the representative laughed. "They always are."

"Now you be kind to him, Katsuki," Mitsuki warned just before the representative opened the door, gesturing Katsuki through.

Katsuki was never more excited before in his life. He'd been waiting for this moment for years, when he'd finally be able to slake his lust on an omega perfectly crafted for his cock. He'd suffered for /years/.

But he'd never been this nervous before either.

Katsuki didn't get nervous. He was always confident, always on top. It didn't matter what anyone else wanted. He was going to get what he wanted no matter what. And that was still true now.

But the representative's words still weighed on him...

Their relationship could go bad? Katsuki didn't care that much about how the omega felt so long as he was getting off, but the thought that the omega might not end up wanting him or even hate him gave him pause.

And his mother had warned him.

If he messed this up, he was shit out of luck. So he had to be... tactful.

It felt unnatural as he considered the representative's suggestions.

The unmistakable scent of the omega drifted in the room, hinting at the dense aroma the nest held.

He wanted nothing more than to submerge himself in it.

But he wouldn't. Not yet.

He relaxed his body, deliberately letting the tension roll out of him, his scent glands opening up. Katsuki inhaled a long and deep breath.

Their scents needed to mingle first.

It was more satisfying than he thought it would be, experiencing what their fused scents became.

Something smokey and sweet.

It had images flashing behind his eyes. Him on top of Deku.

Merging in all the right ways until Deku only smelled of him.

The thought had his gums aching.

He approached the nest, a mess of blankets hiding the resting omega beneath.

Katsuki knelt down and tugged the blanket at the top of the pile to his nose.

Fuck... The scent had him feeling intoxicated.

And it was different than the glove. The arousal was there... but also an intense and distinct foreign pleasure. It had his nerves quieting and a calmness thrumming through his body.

With a corner still pressed to his nose, Katsuki wrapped the rest around his neck.

He made sure to nuzzle against it with his scent glands before replacing it atop the pile. He tried to keep it somewhat organized. He'd put the blankets he already scented in one area and pull the unscented from another.

It wasn't long until he pulled a blanket out and his breathing halted at the image of the omega before him.

He looked like the photo... but also not. The photo showed him teary-eyed, disheveled, in apparent distress. His hair was still disheveled. That was certainly the same.

But his cheeks were flushed with the pleasure of sleep, and his features showed nothing but calm. It was a peaceful rest, and Katsuki had to take the moment to truly admire him before he woke.

This was the omega he was assigned. Petite. Freckly.

Tiny, only barely perceptible little snores. Katsuki wouldn't have even noticed if it wasn't for his excellent alpha hearing. But it didn't really bother him. It was more... cute than anything.

He wrapped the blanket around his neck. This one... it'd been directly on top of him.

He pulled it around his head, nuzzling against the soft fabric and breathing in the still potent scent of the omega. It was such a pleasant smell... no distress, just peace. Katsuki purred, a low rumble.

Those warnings of the representative were coming back to him.

What would Deku smell like in distress? Would his scent sour... because of Katsuki?

He sighed. This wasn't supposed to be stressful for /him/.

Then he felt the blanket sliding against his cheeks, a gentle tug that had him confused as it fell from his head to expose his face.

And there in front of him was the omega, eyes still bleary with sleep and cheeks pink. His mouth hung open slightly, showing hints of his blunt omegan teeth and that pink little tongue.

Katsuki didn't say anything, couldn't say anything. He only stared.

But the omega didn't even seem to know what he was looking at. He just dragged the blanket back over to him, lifting it up to his own nose, heavy eyes drifting shut as he breathed in the scents now intermingling on the blanket.

A high pitched warble.

Something close to a purr. Katsuki distantly wondered if the omega's vocal cords had even developed enough to produce that sound until he heard the quiet rumble that had his heart skipping a beat.

The omega was pleased with him. He liked Katsuki's scent, too.

"Deku," Katsuki spoke, soft as not to startle the omega. His eyes drifted back open, and his head turned back to face Katsuki again.

Those unfocused eyes blinked.

Once.

Twice.

They peeled back to reveal his full green irises, now bright with life, more and more of the whites.

And then he yelped.

A sharp noise that startled Katsuki as the omega flailed, skittering back in the pile of blankets to rest against the nest wall opposite where Katsuki sat.

His chest heaved with his labored breathing, and the air became sour for a moment.

Katsuki grimaced.

They stared like that for a minute, the omega's breathing gradually slowing as he realized that Katsuki wasn't moving or doing anything. He slowly began to survey the room, seeming to finally register where he was and what was going on again.

"You're.. you're..." he stammered.

"Bakugou. Katsuki Bakugou," he answered, feeling reassured as the scent turned from sour to something... spicy.

Deku was nervous... but it wasn't necessarily a bad nervous. Katsuki felt his confidence returning. He could be in control here. He could take the lead.

That smirk he wore so often peeled across his face. "Katsuki."

"Katsuki," Deku replied, and Katsuki hummed his approval. He liked the way his name sounded on Deku's tongue.

"That's right, Deku."

"Deku?" the omega frowned, brows furrowed in confusion. "That's not..."

"Not your name?" Katsuki purred. "Looked like Deku to me." His gaze heated as he watched Deku's cheeks turn redder.

"It's.. it's Izu..Izuku," he stammered.

"Hmm," Katsuki hummed, pretending to ponder it. "I like Deku better."

He watched as Deku's eyes pricked with tears.

"Hey," he murmured. "I like that you're a Deku. Nothing wrong with it."

He could see the omega mulling this over, unsure whether to feel relieved or insulted. He was so young and expressive. It made Katsuki more attentive to his reactions. It had him snorting.

Katsuki began to prowl over, slipping into the nest.

Deku squawked. "Oh! Please! Oh, no, not the blankets!" Katsuki would've felt bad if the omega's melodramatics weren't so endearing to watch. "Katsu--no, not that--Katchu--pluh-please stop! Ohhh noooo... Kacch-Kacchan!"