Late Bloomer

by FreyaFallen

Summary:

Based on a Twitter prompt: Reader is supposedly a beta but presents during a celebration in the dorms sometime during second year, after the war (but haven't decided if LOV is disbanded/gone or not yet).

Notes:

This is my own take on the omegaverse which will be very different from others. There are no cis-male pregnancies, no anal pregnancies. There's a higher instance of intersex alphas and omegas, but that's one of the few changes... I'll explain as we go, especially since reader doesn't know much either.

SMUT INDEX CH. PPL INVOLVED
3. Deku/Bakugou/Reader
5. Aizawa/Bakugou/Deku/Kirishima/Reader
7. Bakugou/Reader
9. Ochako/Reader
10. Shoji/Reader
12. Kirishima/Reader

Chapter 1

In a world ruled by alphas you were the rare beta hero. Some of your friends had teased you about it, but you didn’t mind. So what if alphas with strong quirks dominated the industry? You weren’t in it to shine. You were in it to save people.

“You’re half-omega anyway,” Katsuki teased when he saw your room in the dorm at last. He hadn’t been able to participate in the little show-and-tell you all did, but you’d been curious to see his and offered an exchange.

Your quirk happened to be highly social and came with a nesting habit, so half your room was taken up with one of those special omega beds all filled with fluffy blankets and pillows. 

It’s called Cairo Spiny Mouse, and it‘s a heteromorphic quirk. The only parts physically impacted by it were your coloration and your ears and tail. You were extremely agile and had massive regenerative abilities. You were also small, more like the size of older primary age kids or middle school at least, but you were tough. You had stood in battle and wiped away blood from your face like it was nothing, only to keep moving forward.

It came in handy during the war, as did your heightened senses. The Cairo Spiny Mouse could scent water in the desert and hear the slither of a snake over the dunes from deep within its home. You could smell Dabi from a mile away and forget the ease with which you could smell Shigaraki. They both had signature scents you would never forget.

You heard the alphas talk about scents all the time and how overwhelming they could be, how unbearable the scent of certain others versus the appeal of an omega, but you thought like they were overexaggerating considering none of them had the fine-tuned sense you did. You would know; you tested it against them multiple times.

“I’m still convinced you’re an omega in disguise,” said Katsuki as he plopped down on the sofa beside you. He grazed through your desert-colored hair and skimmed your nape, sending a shiver down your spine. “You smell good, too.”

If you could smell yourself you would apparently catch the scent of desert rose, sunshine, and clear water. It was a pleasant scent, but more something one would find on a candle than on an omega. Still, many of your classmates used your scent as a palate cleanser when the intermingling of so many alphas grew to be too much.

You didn’t mind. Cairo Spiny Mice were highly social animals. During school breaks when you were alone you became lethargic from lack of socialization. It was a whole thing, and sometimes your mom had to drag you out to a mall or another crowded place to get your body moving again.

You loved living in the dorms; it was almost like sharing your nest with siblings. If you were a little braver, you might’ve even asked a few of the other girls to have a sleepover in your room. As an only child, you hadn’t slept beside another person since you were old enough to stop sneaking into bed with your parents.

“You never question the others who are betas,” you pointed out to Katsuki. They were few; it was thought that stronger offensive quirks were more common among alphas to give them an additional protective edge. Omegas often had survivability-style quirks, healing quirks, things to make them more appealing or help them live longer in a world ruled by instinct.

Betas were more versatile. There were betas with quirks that were useful for hero work, like Neito Monoma. His was an excellent hero quirk, as was Minoru’s. He’d shown his versatility in battle, as well as his courage. 

“Yeah, well, none of them are interesting,” Katsuki argued. “They’re all extras like the other betas.”

“But I’m not, so I must be something. Why not an alpha?” you asked.

His crimson eyes narrowed. “Nah. You’re way too shrimpy to be an alpha. Besides, your quirk screams omega.”

Your parents agreed. They were an alpha/omega pairing and were certain they’d have one or the other as a child. When you came out with your cute little ears and your long tail, they thought you’d be an omega and prepared you accordingly. You didn’t care as long as you got to be a hero.

You had wanted to be a hero since you were a small child, perhaps five or six. Like all children, you went through a phase where Allmight was your favorite, and you couldn’t say the man didn’t hold a special place in your heart to this day, but it was hard to choose one now. Those who had remained during the war were all worthy of respect. They had proven themselves to be heroes in the truest sense of the word. They had sacrificed, and they had kept fighting.

When you hadn’t presented, you were relieved. You would rather be a beta than an omega any day. It wasn’t that female omegas specifically were forbidden from being heroes; the rule that they couldn’t be in the Hero Course at U.A. had been struck down at the same time as the one prohibiting quirkless members of society. However, it was heavily discouraged for most. Omegas were to be protected. They were natural mothers, guardians of the future, and that was their place.

Your opinion didn’t matter when you were standing against the whole of society to include most of your friends. You were a social being, and you went with those you considered family.

You rolled your eyes at your friend but allowed him to cuddle against you. It was a thing Class A often did, treating you like an omega when their instincts were on the rise. As long as it stopped at a very firm boundary, you were fine with it, enjoyed it even.

In fact, you often found yourself nuzzling against their scent glands and inhaling, like you were now. 

Unlike most alphas, Katsuki’s scent was sweet . It was partially the nitroglycerin of his quirk, but also just something about him. It reminded you of baked goods and a hint of citrus, like he was cooking something in the oven. Of all things, it reminded you of pineapple upsidedown cake.

He ran hot, and for some reason, that was too much for you right now, so you leaned away. He frowned and dragged you back to him with a massive arm.

“What gives, mouse?”

You shrugged awkwardly. “I’m just feeling a little hot is all.”

“Well, stay still,” he demanded.

Like a good mouse, you did.

Chapter 2

Notes:

I have a few chapters written while I worked through a bit of Scheherazade. So have another today. Daily updates aren't something I foresee for this story unless I get on a roll once I'm finished with my main focus.

Deku came and snuggled in on the other side of you. He was one of your favorites. “Is this okay?” he asked before wrapping an arm around you, and you nodded your consent. He smiled brilliantly.

You loved the way he was so soft with you, so kind, and how he smelled like the deepest part of a forest. If you were an omega, he’d be the type of alpha you liked.

You also never heard him make any of the same remarks others did about how they were all weak and needed to be protected. Sometimes he’d counter them. “What about male omegas?” he’d point out, and they’d all turn toward Kirishima. 

For some reason, male omegas were different. That was part of why they were taken away when they presented. Some of them, it seemed, were like alphas on steroids, while others were more like female omegas. No one could be certain until they presented. 

Those stronger male omegas were encouraged to use their strength to become heroes; Endeavor was one, as was Gunhead.

The whole thing made you dizzy; it was far more complicated than sex and gender. Those were easy: he was a boy, she was a girl, they were nonbinary, she was intersex, but used she/her pronouns, they were a nonbinary transmasc individual who used he/they pronouns. People would just tell you, and that was that.

Asking further about presentations and their peculiarities, unless they specifically related to you, was a taboo subject. The only books kept to a most straightforward knowledge that there were three types of people: alphas, betas, and omegas, and while most alphas were strong and most omegas needed protection, there were always exceptions, so never judge someone on their presentation.

Kirishima noticed you between the green-haired boy and the blond and knelt in front of you. “You okay, mouse?” You nodded. He was always so thoughtful, and you had no idea if it was an omega thing or a Kirishima thing, but you did notice that he treated you as much like an alpha might an omega as the others. “Can I sit here?”

You nodded and spread your legs so he could sit on the floor between them. You were wearing shorts and a tank instead of your uniform, so there was nothing inappropriate about it, but it still felt a little odd. He leaned his head against your thigh, gelled hair prickling at your skin.

“You’re soft,” he muttered.

A hand brushed through your hair, and you rolled your head back to find your teacher standing there. “Don’t you all look cozy. You know this is entirely inappropriate, right?”

There was a round of shrugs throughout the room.

“Come on, teach,” said Katsuki. “We gotta get some comfort from the resident omega– real omega, Kiri, not cheap imitation.”

“You wish you were like me,” Eijiro replied, and the other boy grumbled. It galled at him that the redhead was of the type that could beat him muscle for muscle. 

Katsuki grumbled, and you laid a hand on his thigh which was soon covered with his own. “Whatever, Ei, you’re just jealous I’m up here and you’re down there.”

“I don’t know, man, this is a pretty nice spot.” Eijiro nuzzled the inside of one thigh, and you squeaked at the ticklish sensation.

“If you could cut the foreplay. Damn, you’d think you were all in rut,” said Aizawa. “Unless you all forgot, we have your new classmate moving in today. Aoyama finished taking his shit out last night, so Shinsou’s room is ready for him. You all will at least ease him into the class orgies, yeah?”

“We don’t have class orgies,” you muttered. 

Aizawa’s hand tightened in your hair, and your stomach clenched. “What was that?” he asked. “Were you correcting me?”

Your cheeks burned as you replied, “No, sir.”

“That’s what I thought.” He gazed down at you, eyes narrowing, then shook his head. “You smell different. Is something going on?”

You felt a little hot, but you were also stuck between three very warm bodies. Your throat was also a little itchy now that you thought about it. “Maybe I have a cold? Or something?”

Aizawa lowered to brush his lips across your forehead. “You feel a little feverish. Maybe you should go to bed.”

Katsuki tightened his hold on you. “She’s fine. I’ll make her some soup in a bit.”

“Kacchan just doesn’t want to stop cuddling with her,” Deku teased.

“Oh, like you want to?” Katsuki replied.

Aizawa rolled his eyes at the antics of his students. “Whatever. If she gets worse, someone come and find me so I can take her to the infirmary, or put her to bed, or something.” He disappeared to his office/room in the dorm, and you relaxed back onto the couch.

You had a little crush on your teacher, had since pretty much the first day. There was something about a guy who was just the right kind of mean but also cared, plus his scruff was cute. It didn’t matter to you that he was married to another alpha; it was harmless. A girl was allowed to dream, right?

It didn’t matter. You were happy in your own little world as a beta, knowing you would probably not date much in the hero world since most of them were alphas and they preferred either their own or the elusive omega, but that was okay.

“Are you sure you’re okay, mouse?” Deku whispered against your crown. Goosebumps tingled across your throat, and you turned toward him. 

“Yeah, just a little flu-ish,” you said.

He felt your forehead with the back of his hand. “Yeah, I hope you’re not coming down with something. No one else seems to be sick.”

“Maybe she’s going into heat,” Katsuki joked.

You slapped his arm, and he laughed. “Don’t say things like that. Everyone will start to believe you.”

His red eyes bored into you. “Who says I’m joking?” The way he looked at you made you think he knew better than you did, but you were seventeen. No one presented at seventeen.

Chapter 3

Summary:

Someone finds you alone...

Eventually, you had to excuse yourself; you were too hot to remain between the guys any longer. You got up and went to the kitchen to get a glass of ice water. You gulped some down and then held it to your forehead. After a moment, you put it against your throat too, hoping it would help you feel better.

Your joints were beginning to hurt too, especially your wrists and the inner thighs where they connected to your groin. You curled up on the cool floor and kept sipping at the water, hoping it would help bring down your body temperature. 

Your skin was starting to feel weird, like it was itchy, but not really. It was too tight or too— something. You pushed against the floor, and the pressure seemed to help. You laid completely flat, your forehead against the floor.

You rolled over it, feeling the cold against your skin and wanting it to surround you. Your arms wrapped around yourself, nails digging in like you could claw whatever the problem was out of you. 

You needed something and you didn’t know what it was.

“Mouse?” You glanced up to find Deku kneeling in front of you. “You okay?”

Your vision tunneled in on him. Deku could help you. He was an alpha. He would know what to do. You sat up, crawling half on top of the taller hero.

“Deku,” you whispered, your throat hoarse. “Help.”

“What—” He sniffed the air and his pupils expanded. “Oh, Mouse.”His hands ran all over you, pulling at your top. “You poor girl. You’re burning up, aren’t you?” Your top and bra were both removed, and Deku began playing with your breasts. “Is this helping?”

You nodded, clinging to him once he’d wrangled your shirt off. It felt nice ,and you allowed him to take care of you. 

“Izuku, what the Hell is taking so—” Katsuki paused mid-step as he took in the sight of you half on top of Deku and only in your shorts. He took a deep breath, and his scarlet eyes darkened. “I fuckin’ knew it.” Katsuki closed the distance between you and fisted your hair, forcing you to look up at him. “You are an omega. Needy, pathetic little omega.”

“Don’t be mean to her, Kacchan. She can’t help it.” Deku licked your throat, and you whimpered.

Katsuki knelt so that he was flush with your back. He was so much larger than you were, his arm easily able to encircle your waist and dip beneath your shorts. “Your pussy’s drooling. I bet you want a big fat cock in there, eh?”

“Why do you have to be so mean?” Deku asked. “You know she can’t answer any questions right now. She’s in heat.”

“It hit like a damn train. Wonder why.” Katsuki’s teeth grazed your neck, and you melted back into him with a moan. “Poor, stupid girl won’t be able to tell us. Isn’t that right, you dumb slut?”

“She can’t help being stupid,” said Deku. He laid back and pulled you further up his body so that your hips rolled over him. If you were cognizant of what what happening you’d have been shocked by how large he was and how small you felt like this. He took your wrists in one hand, and it felt so good to have them pressed like that.

“I want her pussy first,” said Katsuki. “I’m the one who knew she was an omega. I called dibs ages ago.”

“Yeah, yeah, I know,” Deku griped. “I’m happy fucking her thighs anyway.

They talked about you like you were an object, a sex doll meant for use instead of a living, breathing human being usually capable of making your own decisions. Had your scent not been filling their heads with thoughts of you thoroughly bred they might have realized the best thing would be to put you to bed. As it was, neither had had an opportunity like this in so long, and they weren’t going to turn it down now, not when you were clinging to them and begging for them to take care of you.

Instead, your thoughts were now focused on getting this deep itch to go away, and there was only one way to do that; you knew it even if you’d never done anything like this before. 

Your core clenched at the idea of something thick inside, something that would satisfy you. You bent down and started kissing along Deku’s jaw, murmuring, “Please, please, please,” whenever your sloppy mouth was off his flesh.

A hard slap drew your attention back to the man behind you. He stared with heavy crimson eyes. “We’ll give you what you need. Gonna breed this virgin pussy and fill you with my cum. Is that what you want?”

The words made you shudder. “Uh-huh.”

“Sit up again,” he ordered, and you did as he bade. Katsuki adjusted you so you sat low on Deku’s upper thighs. He unbuttoned and unzipped the uniform trousers the other young hero was still wearing and drew out a dick that would have been impressive even if it hadn’t been the first one you’d ever seen. Even Katsuki whistled at the sound. “Not bad, nerd.” He drew you to close your legs around it. 

Deku’s lashes fluttered as he felt your plush thighs close around his shaft and head. 

Katsuki leaned over you, tugged your shorts down past your ass and said, “I’m gonna fuck you and you’re gonna fuck the nerd. Keep your thighs clenched and I promise I’ll fill this pretty pussy up until you cry.”

With that, he pushed a finger into your pussy. You were so wet that it was easy enough for him to slip in a second, working you open until a third could go in. He pumped them, feeling around for that spot inside you until you were keening and pushing back against his hand. He laughed when he glanced down to find Deku biting his own fist.

“You ready to take my cock, sweetheart?” he murmured against your bare skin. “You better hope so, because here it comes.”

Chapter 4

Summary:

The smut begins.

Notes:

Daily updates will continue until I stop writing a chapter a day.

You felt something nudge against your entrance, and you wanted to push back against it, but Katsuki’s hand was on your back to keep you in place. You felt him rub the head in your slick and he was about to push in. You whimpered.

“What the hell is going on in here?”

The three of you looked up to find Aizawa gazing down at your position on the floor. The man’s dark grey eyes narrowed, and he sniffed at the air, shook his head, and laughed. “I see. And this is how you idiots react.”

He walked past Deku on the floor and wrapped his hand in your hair, pulling you up by a fist of it. “Is this really what you want? You finally fucking present and you choose to get railed by two fucking teenagers?”

You whined at the treatment both because it hurt and because it was somehow exactly what you needed. You knelt with your shorts and panties around your thighs and otherwise naked. Your hands reached out to him, and he batted them away.

“Don’t touch me.” His voice was cool. “I should drag you up to your room and barricade you in there until this is over.”

The thought of being alone, enduring this without anyone else around you, was terrifying. “No, no, please,” you plead. You reached for him again, and this time he allowed you to cling to his trousers. “Please, sir.”

Aizawa looked down at your flushed skin, your blown-wide pupils, nipples pert, and felt himself harden. You were a sight to tempt him. 

Aizawa was a somewhat good man, but he could admit to certain weaknesses. Needy omegas on their knees begging for him? One of those weaknesses. It made him want to grab you by the throat and fuck you senseless.

What he should have done was taken you to a secure location to ride it out so that you could coherently decide the protocol from here on. But his instincts were begging him to put the little assholes who were about to take you in their place and do it himself.

“So? So would you rather I leave you here with them?”

You shook your head. You didn’t want him to leave. You felt so safe with him, trusted him. You nuzzled against his leg to show him how much you wanted him to stay.

Aizawa hummed. “In that case I’m gonna fuck you.”

“Hey—”

“Mr. Aizawa!”

The older man held up a hand and silenced the two boys. He eased you up to stand and had you shuck the clothes hanging from your body, then he took stock.

How had he not noticed your body was changing over the last few months? Now that he knew what was happening, he could see it, see the way your hips had spread and your body thickened. He palmed one of your breasts, and you trembled, overly sensitive in your skin. Aizawa chuckled at the reaction. 

You were such a good girl. He’d often thought of how you’d be the perfect omega, always eager to obey his commands, fiery when sticking up for classmates, and resilient in battle. Besides, you smelled wonderful and you were so damnably cute. 

He could mark you, claim you as his, bring you back home for his partner to mark too. If they kept you safe long enough, no one else would be able to claim you, not even by the lesser scent glands. You’d be theirs; theirs to love, theirs to breed, theirs to do whatever the fuck they wanted to. However, he had no idea how you would react once you had come out of your heat, and he would prefer to bond an omega who wanted him all the time, whom he didn’t have to constantly force.

At the same time, he knew he had to warn the rest of the class against doing that very thing. Who knew what would have happened if he hadn’t interfered. Bakugou and Midoriya both could have claimed you.

A thought came to him. He lifted you into a bridal carry, and you clung to his shirt and nuzzled at his throat with little kitten licks. The boys protested when he entered the common area, but Shouta had decided something. He was going to announce it to the class.

A good half of the students looked up upon your entrance, pupils immediately blown and mouths watering at your enhanced scent. It didn’t matter that they could smell three other alphas had touched you. You were unclaimed and in heat. “Looks like our little Mouse is an omega after all.” Aizawa stroked your thigh, and you whimpered, opening your legs a little.

“She will be welcome to stay in our class as long as our learning isn’t disrupted and no one is to claim her without permission.” He shooed Kirishima and Mineta from the couch and dropped you on it. You squeaked and gripped the cushions behind you, then he crouched over you, black hair obscuring half his face and looking for all the world like a predator about to swallow you whole. “However,” he continued. “I think it’s only fair that, since our Mouse has benefited from our care without any repercussions, she learns how to take care of others, too.” The class held its collective breath as everyone waited for him to explain. “Those with certain… instincts…” He nodded to Kirishima who, while not an alpha, behaved more like one anyway. “You can use this pretty thing to ease them as long as you remember the rules.

“Like I said: it does not disrupt the learning environment or studies. You do not claim her. Lastly, no one outside this class is to know. Understood?”

Shinsou stood in the doorway, purple eyes locked on your nude body. He entered in time to hear Aizawa’s speech and nothing more. “Welcome to Class A, I guess,” he muttered.

“Get in and shut the damn door,” said Aizawa. “Good timing, because I’m not explaining this shit again. Now you can all take a seat or go to your room, but I’m fucking her first.”

Notes:

We are about to get dirty.

Chapter 5

Summary:

Sex happens rather than foreplay

Notes:

PIV, oral m receiving, groping, degradation, praise, kissing... lots of stuff.

You barely paid attention as your teacher unbuckled his belt and got his dick out, just groaned when you felt it between your legs. Then hands were on your face and you were staring into kind red eyes. 

“Take a deep breath for me, baby girl.” Kirishima had your head in his lap and he was stroking your upper body gently, affectionately. “That’s it.”

You did as told, and then Aizawa pushed in and you cried out, your hands grasping your teacher’s shirt. He felt so big, stretching you out despite Katsuki’s hard work preparing you.

“Tight,” the man said through gritted teeth as he eased out and inside again, trying to bully himself inside you.

Kirishima took one of your hands from the clothes and let you clench his hand instead. It was large and warm, and you could squeeze it as hard as you liked. It felt good to hold as you were filled to the threshold of breaking.

Aizawa’s fingers were digging into your thighs as he fucked you harder. He bent over you and began to bite at your breasts, your stomach, your throat. 

You were overwhelmed with sensation yet somehow wanted more, your legs trying to close around your teacher and draw him deeper. You keened at the sharp edge of his teeth, arching into him.

“Please, please, please,” you begged. 

Kirishima bent down to take your lips with his, tongue skirting along your teeth and dipping into your mouth. It was a messy kiss, possessive. 

“Fuck, keep doing that, Kirishima. She’s milking me.” Someone took your free hand from Aizawa’s clothes and started licking and nibbling at your wrist. You couldn’t see who, and in that moment, it didn’t matter.

There were hands all over you, touching you, fondling you, mouths at your breasts and on your thighs and your stomach. You could hardly breathe between kisses as Kirishima turned your head to meet another set of lips, a sweet taste on the tongue of this one.

“Such a slut, doesn’t care who’s touching her.” Hands wrapped around your throat and squeezed, and your head jolted up. You met your teacher’s eyes, your mouth bruised from kisses, and your body littered with marks. “Gonna knot this pretty cunt.” He pounded into you so hard you saw stars. As his hands continued to cut off your oxygen, your eyes rolled back, and you spasmed around him.

He expanded inside you and it hurt, stretching you further and hitting parts of you that you never knew craved it. It set off another orgasm, your toes curling as you came. His hands tangled in your hair, and he brought your mouth to his with a snarl. You felt him filling you up, locked with your body. After a moment of possessing your mouth, he threw your body down and knelt atop you, locked inside you.

“You can use her mouth, you idiots,” he said as he leaned against the back of the couch, his eyes heavy-lidded. 

“But, Mr. Aizawa, what if we knot in it or something?” asked Deku from his spot beside you. 

The teacher chuckled. “You only knot inside an omega’s mouth or ass. Her mouth is safe.” He grabbed your face and squeezed your cheeks. “These pretty lips were made for sucking so let me see you put her to work.”

“Outta my way, nerd.” It was Katsuki; he pushed through the crowd and pulled out his still-hard cock. “Open up, whore.” 

Your head was pushed on its side and you dizzily opened your mouth so he could push his dick in. It tasted slightly sweet and salty, a little bitter where you could taste his precum. His fist tangled in your hair and he started pumping in your mouth, pushing his dick until it blocked your airway.

Pressure on your clit made you twitch. Aizawa was rubbing it in little circles, watching while you were being used by your classmate. His own cock twitched with interest; he rolled his hips and his knot pulled against the tight pussy around it, making you twitch.

Between the lack of air, Aizawa still inside you, and his playing with your clit, you were on edge again.

“Fuck, I wanna breed you so bad,” Katsuki muttered as he picked up his pace. Drool slipped down your lips, your face, onto the couch. “Gonna mate you soon as I can,” he promised.

Someone— Kirishima, though you could not know— kissed your throat and mouthed at your scent gland there. You wanted him to bite so badly it hurt, wanted to be mated while there was something in your cunt stretching you so beautifully. You wanted it all again and again and—

You seized up as you came and then went slack, your throat relaxed enough to allow Katsuki to fuck back into it. He groaned, both hands on your head as he maneuvered you to take more, then grunted and came straight into your stomach.

You laid there dizzily as someone played with your breasts and then came onto them. When you gazed through hazy eyes you saw green hair as he wiped the tip of his dick on your flesh.

“Aw, I think she’s tired,” said Aizawa. “I think we should let her sleep.” He stroked along your cheek, then slapped it lightly. “Are you there, sweetheart? Want daddy to take you to your nest?”

You hummed sleepily at him. 

As Aizawa was finally able to slip free from your cunt he knelt and swept you into his arms. “She’s a sleepy girl. We need to let her rest and recover before she gets fucked silly again. Remember, this is just the start of her heat. Bakugou, make her something to eat. Something nutritious. Someone get electrolytes and water for her. We gotta take care of our little omega.”

He began to walk up the stairs, and you snuggled closer to his body, enjoying the comforting scent of him. The rhythmic beat of his heart made you feel safe as you drifted asleep.

Chapter 6

Summary:

Waking up after.

You woke curled up in your nest and wrapped in a black shirt that was vaguely familiar in appearance and smelled like sandalwood and smoke and… Mr. Aizawa. You were sore and you did not know why. You glanced down at your body and saw bruises and bite marks littering your body as well as crusty white dried across your breasts and between your thighs.

Your memory of the previous happenings were a blur. You vaguely recalled feeling unwell while cuddled between some of the boys. You’d gotten warm and…

You weren’t entirely sure what happened after that, but there were vague impressions of bodies and pleasure and need. It was all a lot to comprehend, but one word kept repeating through your head: omega.

But that couldn’t be; you were past the age of presentation. No one presented this late, ever. And if you had surely you would have been put right in your nest and not…

But you could smell at least three of your classmates on you, and your teacher as well. 

Then again, if you had launched into a sudden heat, who knew how your classmates would respond? They were overwhelmingly alpha, though you could smell Kirishima on you, too.

His scent was candy sweetness and earthy stability. You liked it, especially in addition to the multitude of alpha scents (Deku and Katsuki and Mr. Aizawa mostly) that clung to you. You wished you had something of his to add to the nest.

Slowly, you sat up and inspected your room. You had one of those special omega mattresses that made it easy to nest, and a ton of pillows and plushies and blankets of all sorts to fit it properly. Your room was mostly decorated desert-like with a few cacti to add greenery, and a desert rose you lovingly cared for. The carpet was greige and the walls were painted like the start of a sunset. Over your bed was hung one of those mosquito nets only you’d replaced it with a sandy colored sheet so that you could feel perfectly enclosed and burrowed in your nest.

It was all as you left it except that there was a large bottle of water and electrolytes. That made you aware of just how cotton-dry your mouth was, and there was a weird taste, too, something a little bitter. You climbed out of your nest and opened the electrolytes to down half of it at once.

There was a knock at the door; you were naked. Shit. You grabbed one of your blankets and swaddled yourself in it. “Yes?” you called out.

The door opened to reveal Katsuki holding a tray. 

“You coherent enough to eat, Mouse?”

You stared at him for a moment, a visceral memory of his teeth on you suddenly flashing through your mind before you shook it free. “Yeah. I can eat. Here, on the desk,” you said, nudging aside a miniature cactus in its little clay pot. 

He set down a hardy stew and then stared at you. “You, uh, okay?”

“Sore,” you said. “Did I really go into heat?”

“You’re still in it, you just have other needs right now,” he replied. “We had to put scent blockers on your door to keep everyone from going feral.”

You gestured at your throat. “I think that already happened.”

His cheeks stained pink. “Yeah, well. It was kind of a whole thing.”

“Did Mr. Aizawa really…” You couldn’t say the words, but he nodded.

“Yeah, and I used your mouth. I’d say sorry, but I’ve been telling you’re an omega since we met, and you just didn’t listen,” he defended himself. 

You held up your hands. “I wasn’t arguing. I was just— How was I supposed to know?”

Katsuki stepped behind you and laid his hands on your shoulder. “Hey. You need to eat, sweetheart.”

You sniffled and took up the spoon, dipping it into the stew. “Smells good. Thank you.”

“You’re welcome.” He bent to kiss your throat. “I wanna mate you, you know.”

You tried not to freeze; alphas would do a lot of things, but mating without clear consent was a violation worse than rape. Katsuki wouldn’t do that.

“What if I wanted more than one mate?” you said testily, then took a sip of the stew. It tasted delicious, but you weren’t surprised. Katsuki was the best cook in your class by far.

“Depends on who it was,” he said. “I can share what’s mine with the right person, but…”

“What about Kirishima or Deku?” you asked.

You didn’t see him grimace. “Kiri, maybe. But Deku? I don’t know. We have a history.”

“I know,” you replied.

Everyone knew of their past by now, and you all respected them for overcoming it. It wasn’t easy for Katsuki to unlearn bad habits, and Deku had accepted his changes with such grace.

You only hoped you could do the same with your new life. “I’ll need to tell my parents. They might withdraw me.”

“No,” he said instantly. “We decided you’re staying, and until you have mates we’re all considering you our omega. We’ll stop them if they try.”

“Everyone?” You snorted at that. “I doubt that will fly.”

“Mr. Aizawa will fight them too; he’s the one who decided you’re ours.”

“Do I get a say?” you asked.

He huffed. “Not if you wanna stay here. We’ll keep you safe from everyone and fight to keep you in our class, but you gotta accept our side of the deal, too.”

You nodded. You’d be the first real omega hero; those like Endeavor were different. Some had even suggested giving them their own designation despite its clear relation to the omega designation. You thought that wasn’t a bad idea since they didn’t really represent those… well, those like you.

“I want to be a hero,” you said. “If you can do it, then so can I.”

“That’s my Mouse,” said Katsuki. “You can take whatever we give you, I know you can. Now eat up. I still haven’t gotten to properly fuck you.”

Notes:

More smut next chapter.

Chapter 7

Summary:

Katsuki smut

You were nearly finished with the stew when your skin started to prickle like it was about to break into sweat. You wiped at your forehead. You were so warm that you drank down the remainder of your water all at once, using your forearm to clean away any drops that might have leaked from your lips. Your neck especially felt sensitive.

“You’re feeling it again, aren’t ya?”

You whipped around to see Katsuki staring at you, his arms crossed over a bare chest. You licked your lips, unable to tear your gaze away from him. 

“See something ya like?” 

You shrugged, suddenly awkward in your own skin. It felt too big and too tight all at once, like you needed a set of claws to help you peel it off.

Or teeth . You stared at his sharp smile, and it widened as though he could hear what you were thinking.

“Oh? You’re down bad already. C’mere.” You clambered toward your bed, and he pulled you on his lap when you neared. He was already hard. You could feel it through his trousers. “That’s a good girl. You like being good for me, don’t ya?” You nodded. “That’s what I thought.” One of his hands wove into your hair and tugged your head back so he could stare down at you with those dark crimson eyes, irises just a sliver around the largess of his pupils. “One of these days we gotta have a talk about me mating you. I’m not letting one of these extras do it, not before I do. I’m gonna be your first, okay?”

Your head was stuffed full of nothing, and your body was craving something only he could provide, but you were present enough to give as much of a nod as you were able.

“Good.” Katsuki used his free arm to pull you up and released his dick. “Sit on it and bounce.”

Despite the wetness already dripping between your legs and the stretching you took scant few hours ago, you were tight. You hardly got his head in before he lost patience and tossed you onto your stomach. Katsuki pulled you up on your knees, pressed down between your shoulders, and shoved himself as deep as he could go. At that point, it was only halfway in, but you keened and pushed back against him.

“Fuck,” he gritted out as he dragged his cock back to slam into you again. “Already so fuckin’ tight. Do we gotta stuff somethin’ in ya to keep ya open, Mouse?” He held your ass cheeks with his hands so he could spread you open and watch unobstructed, relishing the view of himself slowly driving deeper into your cunt. “There ya go, good girl.”

“Kats—” You were unable to think past his name, past the feelings he was evoking in your body. Every time he moved he rubbed against a spot in you that was sinfully good. Your hands scrabbled at your nest to grab something, anything, nails clinging to the soft materials as though you could secure yourself that way.

“Yeah, that’s right,” he grunted, speeding his thrusts as he was finally able to bottom out. “Can’t wait to bite you. Gonna breed you every day,” he promised.

You moaned, but whether at the idea of being constantly kept full by him or just what you were currently experiencing, you didn’t know.

There was something about Katsuki, had always been. You knew that even betas felt the magnetism of alphas at times and assumed it was like that, but maybe he just called to your inner omega and you’d never known it.

The way he moved inside you was maddening. He canted your hips higher and shoved a thick pillow under them to hold them in place. You keened and pushed back into him. “Such a slut. Were you really a virgin before Aizawa pounded you downstairs?” When you didn’t answer he grabbed a fistful of your hair and demanded again, “Were you a virgin?”

“Yes!” you cried. “Yes, Katsuki, please.”

“Aww, need me to keep going?” he teased, halting his movements inside you and holding you so that you couldn’t shove him deeper into you.

“Yes, please, please.”

He released your hair and wrapped the same hand around your throat to hold you in the same arched position. “Fine. You asked for it.” And then he began thrusting so hard you wondered in the back of your mind if he was somehow using his quirk. But no, Katsuki was just that strong. He had you arched like a sex toy, and you loved every second of it.

“Gonna fill you up,” he promised. “Gonna knot this sweet pussy. Who owns this pussy, Mouse?”

Your mind scrambled for the answer he wanted, and it was so easy because you were just screaming it. “Katsuki.”

“That’s fuckin’ right. I own this pussy. I own you. Gonna… fuck.” He grunted as the base of his cock thickened inside you. It pressed against the perfect spot and sent you reeling over the edge, crying out and fighting his grip all the while.

“Fuckin’ milking me,” he muttered as he kept shooting his seed inside you. You felt stretched and full as your walls fluttered around him until he finally locked you up, holding all his cum in place with his thick knot. 

Katsuki half collapsed on top of you and rolled to the side so he was spooning you. You glanced down to see his cock still locked inside you and felt an aftershock of orgasm at the sight. “Don’t do that,” he grunted. “Can’t go again right now.”

“Sorry,” you murmured, though you weren’t sure how you were supposed to control it.

“‘S okay,” he said and threw an arm over you to cuddle closer, nuzzling your throat so he could smell the scent of you, which was strong with your heat. “Can’t wait to mark you.” He yawned. “Gonna be soon. Promise.” With that, he drifted asleep, leaving you held in place even after his knot deflated.

Chapter 8

Summary:

You just wanna take a shower.

When you woke you were alone and still naked with yet more cum leaking out of you. It was a good thing alphas couldn’t actually breed unless they were mated to the person, so you were safe there. Nothing would inhibit your hero training except if they managed to do this to you so often that you were constantly sore.

However, you knew you’d be healed soon enough. That was a benefit of your quirk: super regeneration. Cairo Spiny Mice were the type that could regrow their tails when they were chopped off, and they healed perfectly, thus you did too.

After drinking some water and eating a protein bar that was sitting aside you felt a bit better. You wondered if you could go take a shower.

If I’m in heat… Maybe that wasn’t a good idea. Except what would be the danger? It was a separate bathroom for boys and girls, and it was just across the hall. Surely it would be fine. Besides, you only had so long before your heat slammed into you full force. You had to hurry.

You grabbed a robe, a towel, and undies, your bathroom basket, and opened your door, eyeing the hall in both directions. The scent of the blockers surrounding your door almost stung your nose, but assured you that you were probably safe in the near vicinity as well. You were well-placed and only had to walk three feet to enter the bathroom.

There, you aimed directly for the showers. You turned on one of the shower heads and instantly found yourself surrounded by warm water. You ratcheted up the heat until a plume of steam enveloped you, and you sighed, leaning against the contrasting cool tile.

Now this was the life. The dorms at UA were top-of-the-line. If you wanted, you could sit in the sauna instead, but a shower would be quicker and you wouldn’t have to worry about emptying it of questionable things immediately after. You started to scrub down and got lost in thoughts.

Now that you were officially an omega, you had to think about things like mates and what family size you wanted. Both alphas and omegas had six major scent glands. Biting any one of them would mate one person to another. A bite from each to the other tied the bond both ways. Thus, an alpha and an omega could have six partners each. They could even have bonds with betas who bit them and bite them in turn, though those bonds were often weaker and had to be renewed.

The closer together the marks were done, the more even the bonds were; if one was done years prior to others then the older bond could even force out the newer ones. It was all very complicated, and you had no idea how omegas handled it all.

Typically speaking, most people had one to two partners. It wasn’t unusual to have a third partner who was in and out of life at times, called a comet, but anything beyond that tended to be considered unusual. Mates often preferred to be interconnected, too, with alphas who bonded the same omega being bonded themselves even if they were not one another’s preference. This way they could form a closed family.

There were supposedly ways to nullify newer bonds too, but all of that was over your head.

Your glands were located: two on the throat, one on each wrist, and one on each inner thigh toward the groin. You knew those last two were often the least used because everyone wanted their marks to be public. 

So wrapped up in figuring out your new reality you were that you didn’t notice the door open and a draft of cool air, not until a voice behind you said, “Oh, look who’s up and about.”

You turned to stare at Ochako through the veil from the shower head. You hadn’t expected anyone around this time, though you weren’t entirely sure what time of day it was to be honest. All you knew was that the sun was still out.

Ochako was further proof that alphas didn’t all look one way. Most people upon seeing her would assume, short and curvy as she was, that she’d be an omega. She was not. The way she was gazing at you would have been all the proof you needed, even if you didn’t know.

“Wow,” she said. Her pink cheeks were darker than usual and her pupils had swallowed up her eyes. “You look so cute right now. I’ve never seen an omega in heat before.”

Your own cheeks burned to match hers, and you stepped back toward the wall, suddenly uncertain.

“What’s wrong, Mousie?” she asked as she started stripping out of her clothes. You hadn’t even realized she was still dressed or that she had her shower stuff with her. “We’ve showered at the same time before.”

“Y-yeah,” you admitted. But the way she was eyeing you made you think she should have had a snake quirk instead of a gravity one. Your stomach flipped as she gazed shamelessly at you.

“I never really saw the appeal with Toga. She was pretty and all, but…” Now that she was naked, you could see every curve. She reached past you to turn on the showerhead beside yours. “You’re just so cute.” Ochako started soaping herself up, maintaining eye contact as her hands went to very full breasts and lingered there for some time. “I could eat you up.”

You swallowed and turned back into your showerhead, and your stomach cramped with need; you had to ignore it and finish scrubbing yourself clean, then get the hell out of there before something happened.

An arm wrapped around your waist, and you felt warm breath stir at your ear. “You know, I don’t think it’s fair that the boys get all the fun. What if I wanna play with you, too? You’re okay with that, right?” Her hand wandered up to tweak your nipple, and you moaned. “I just wanna see if you taste as good as you look.”

Notes:

Updates are sporadic because this is kind of a filler fic for me, not a focus. Next chapter is Ochaco/reader smut. Feel free to skip if not your cup of tea. Will have no bearing on plot (what plot?)

Also, who are you rooting for to bond reader? In this AU you can bond up to six partners... extreme? Yes. But I haven't decided how many we'll wind up with.

Chapter 9

Summary:

Ochako <3

Ochako walked you back against the wall and lowered herself to the floor. “Put your foot here. Use me for balance.” You did as she said. She sounded like she had experience, but from the look on her face, you thought she probably didn’t. With your legs spread, she used her fingers to further open you up. “Wow, you look amazing. So different from me, but I bet we work similar.” She tested out playing with your clit in different ways until she found a circular motion that made your hips cant.

“O-Ochako,” you murmured, trying to find your way through the haze of hormones flooding your brain. You had known what the male alphas were after, but with her you were lost. Your inner omega was begging you to please her somehow and you were clueless.

She slapped your thigh playfully. “Just hold still for me, ‘kay?” One of her fingers, so much more delicate than the boys’, slipped inside with ease. She added another and began to scissor them to see what your easy limit was. “Wow, I bet I can fit all four with how wet you are. Those boys really did a number on you.” 

Despite her words, she added fingers one at a time; four was a tight fit but she eventually managed, and it felt amazing to have so much of her inside you. Then she leaned forward and sucked your clit.

You jolted forward, your hands flying to her head for some semblance of balance. Her free hand, which had been resting on your hip, swatted you back. “Stay against the wall, silly. I don’t want you falling over.” Once you had righted yourself, she went back to testing her tongue against you.

It was like nothing you had ever felt before, and you could only imagine it was because Ochako thought of what sensations must be like on herself to explore them on you. She sucked your clit between her teeth and battered it with her tongue until you were keening, head thrown back against the wall, wet hair whipping as you tossed it in the throes of desire.

She started pumping her hand furiously inside you once she had a rhythm with her tongue figured out, and it was like one long tightrope walk leading up to an avalanche overtaking you. You screamed as you came, once more gripping her head between your thighs. She just hummed and let you. Once she pulled her mouth away, you sank to the floor.

Ochako had a hand between her legs, and she fell on you, kissing you soundly. You could taste yourself on her lips, a salty-sweet liquid that was not at all offensive, and you let her in as deeply as she wanted. Within seconds, she was keening, and then she backed away.

“Well, that was fun,” she said, still panting. “You should finish washing and then go rest some more. I’m sure you’re tired.”

“You don’t need more?” you asked, your head still catching up with everything that had happened.

Ochako laughed and gave you a peck. “I can’t exactly knot you like the guys, can I? Nah, this was fun, and maybe we can do more some time. But my inner alpha is telling me you’re about to get tired.”

That was true. Being in heat was a lot; you’d read somewhere around puberty that it was because of the constant high temperature, it wore down on the body. 

You washed away all the slick that had gathered between your legs and finished wiping away the remaining sweat and fluids, then turned off your showerhead and dried yourself.

After you dressed, you opened the door and stepped into the hallway, nearly bumping into Shoji. He was holding a tray of food, and his dark eyes widened above his mask. “I was just…” Then his eyes turned thoughtful. You noticed a nose on one of his dupli-arms rise up and sniff. “Did something happen?”

Your cheeks flushed, and you shook your head. “I was just showering and now I was going back to my room.” You darted around him and opened your door. Just before you closed it again, one of his arms slammed against it.

“This is for you,” he said, indicating the tray. “We thought you might be hungry.”

You stared at him a moment and then nodded. “You can, um, set it on the desk. Thanks.”

He walked in and placed it down, then sat in your chair.

“Shoji? You can go now.”

He shook his head.

“What’s wrong?” you asked.

“I need to see you eat,” he said.

You edged around the desk to look into his eyes. “Is this some weird alpha thing?” He nodded. “It’s not like I’ve ever starved myself.”

“You’re the class omega now, so we all gotta take care of you,” he said.

“Well,” you said slowly. “You’re in my seat.”

He stood and leaned against a wall, crossing his primary arms across his wide chest. You sat in your chair and looked down at your food.

It was rice with a seasoned meat and veggies. There was a bottle of water and a bottle of an electrolyte drink on the side. You popped open the water and guzzled a little, then turned to the meal. “Thank you,” you told him, then started to eat.

It was good food. You didn’t think Katsuki made it, but whoever did knew their way around a kitchen well enough. You ate almost every bite and then shook your head. “It was really good, but I’m stuffed,” you said. You had at least eaten all the meat and veggies.

Shoji leaned over to inspect your bowl and nodded. “Good.”

“Are you leaving now?” you asked him. “I’d offer to take my tray down but—”

“You’re not supposed to leave your room until your heat is over,” he said.

You nodded. “Right. I figured here and the toilet are about it.” You grinned to soften the words, but he stared at you expressionlessly. 

Sometimes you did not get Shoji. He was nice, but so stoic. For instance, he’d brought you food. However, now he wasn’t leaving, and he gave you no hint as to why. And then his eyes narrowed and he started walking toward you as his scent smacked into you, stronger than you’d ever smelled it before.

Chapter 10

Summary:

Shouji smut... who do we wanna see next?

Notes:

I've officially posted 1 million words to AO3, whoop!

Shoji led you into your room, shutting the door behind himself and leaning against it. His dark eyes stared down at you from his superior height. He’d always been tall but why did he feel even bigger today? Maybe it was that you felt smaller, weaker given your circumstances. You were still clear-headed from Ochaco but he was not; his scent perfumed the air, sea breeze and cedar in a heady combination that made you think of the coast. As you smelled it it seemed to coil around you. 

You whimpered as he took a step toward you. He loomed . Your eyes widened and you shook your head, unsure what you were saying no to.

“What’s wrong, Mouse? You look scared.” 

You could hardly speak for your heart beating in your throat. This was nothing like the encounter with Ochaco, which had been somewhat gentle compared to all the others. 

His eyes narrowed in a way that made you think he was smiling beneath his mask and he kept stepping closer until you slammed against the wall, out of space to retreat. Shoki wrapped a pair of hands on his duli-arms around your wrists and easily pulled you up, dragging you across the room to the bed. “You know you’re the class toy now, right?”

“I am not,” you said at last, voice hoarse as you spoke.

He shrugged. “Pretty much.” Shoji took the towel you’d wrapped around yourself and tugged it away so that you were bare. If he minded the rapidly fading marks of others on your skin, he said nothing.

His main hands skimmed over your body eagerly while his dulpli-arms remained in place, holding you in place. “You’re really cute like this.” You know, I’ve always thought you’re the cutest girl in class anyway. This whole omega thing though… just makes it harder to ignore.” He bent down and nuzzled along your throat. “Too bad I can’t mark you. I’d be the nicest alpha.”

You could believe it; Shoji was one of the kindest people you knew despite how he was currently handling you. Though to be fair, all he’d done was a little looking and touching, a far cry from the others.

He moved his hips between your thighs and you could feel that he wanted to do more. “Let me show you how nice I can be.” Shoji grinded against you, and you could see that you were already getting wet, your slick sticking to the front of his pants. You made a noise in the back of your throat and bucked up into him without meaning to. Your body just started reacting. ‘Your stomach tightened, and you felt that itchiness return to your flesh, that need. 

“Yeah?” Shoji asked, huffing out a little laugh at your reaction. “Alright. I can help you.” He worked his trousers open and revealed his cock to you. It was proportionate to the rest of the large young man, wide and long as he was muscular and tall. He rubbed his head against your entrance. “Do you need me to prep you or—”

The sensation was too good to your lust-addled brain. Your hips rolled against him, and his head nudged at your entrance. Shoji laughed against and pushed himself slowly inside, inch by excruciating inch. You keened and arched into him, wishing he would just shove it and get the delicious stretch over.

“So eager…” His eyes fluttered shut as he began to fucked you open, making room for himself in your tightness. “That’s it,” Shoji said when you moaned. His eyes opened to slits and he watched you thrash against his hold. One set of hands reached to tweak your nipples, twisting them as you made different sounds, gauging what felt best.

With each thrust Shoji’s pelvis rolled against your own, stimulating your poor clit. It felt too good with all of his other treatment. Even the hands holding you in place were perfect to fight against, to resist, though you didn’t really want to. He was too strong for you to fight him off anyway.

“You feel so good, little mouse,” he murmured in your ear, breath hot even through the cloth covering his mouth. You wished you could feel his teeth against your ear, your throat, anywhere. You knew they were razor sharp and would add to the medley of sensation across your body. “You want me to knot this tight pussy?”

You keened and tightened around him, and he hissed, stilling for a second. “Not yet,” Shoji said more to himself than to you. “Gotta get you there first. Wanna feel you…” He nuzzled his warm face against your throat and started moving his hips faster, angling himself for your sweet spot. He was rewarded with a gush of liquid and your walls fluttering around him. You wrapped your legs around his body and rode him through it, plummeting over the edge again when his base thickened and pressed so perfectly against that spot that you saw stars.

“Fuck!” Shoji leaned his head against the mattress as he came in thick ropes inside you. You could feel each spit, and when he was done you thought you felt full because of it. The thought made you tighten again, and he shuddered. “Don’t do that,” he pleaded. “I might have to go again.”

“Can you do that?” you asked.

His eyes narrowed in a smile. “I can try,” he said and experimentally shifted his hips. His knot rubbed against your insides deliciously but stayed nestled inside. “Feels good,” he panted. “Yeah?” You nodded and he kept moving like that, his hand shuffling down to rub at your clit. “That’s it. Cum around my knot like a good omega,” Shoji urged as his fingers rubbed faster. 

Your toes curled and your back arched away from the mattress as you came again, tightening down hard around his knot. A spot of red appeared on his mask and you realized he must have bitten himself when you came. He finally collapsed with you in his arms, panting. “Wow. That was amazing.”

Chapter 11

Summary:

Kiri comes to talk.

Shoji cleaned you when his knot finally deflated, all gentleness again. He cupped your cheek when he was done. You yawned and nuzzled into his touch, and he chuckled. “You’re gonna fall asleep again, aren’t you? That’s good. You need your rest.”

You barely saw him grab your tray before your eyes fluttered shut and you were lost to slumberland.

 

When you woke, it was to someone sweetly humming to you and stroking your hair. You were pleasantly warm and cuddled against a familiar scent, one that was earthy as a mountain and sweet as a pastry shop.

“Kirishima?” you said sleepily.

The petting motion paused. You heard a chuckle, then it resumed. “Hi, Mouse. Did you get some good rest?”

You turned toward him, smiling up at his friendly scarlet eyes. 

It was always a joy to be around Kirishima; he was like sunshine given human form, always so bright and cheerful and kind. You reached up and touched his spiky hair, and he beamed at you. 

“I had to come check on you, make sure all these alphas weren’t being too hard on our poor little class omega,” he said, giving you a light squeeze.

You huffed. “I thought you were the class omega.”

“Not like you are, Mouse,” he replied. “You need to be protected, taken care of.”

“Are you here to take care of me, Kiri?” you asked. 

A pink flush rose to his cheeks. “Maybe. Yeah,” he nodded. “I really did have to check on you. Sometimes I think omegas like me were created to check the alphas and make sure they don’t become too abusive. Are— are you okay?”

You thought over the events of the day and how they had unfolded, what you remembered anyway. A lot of it was a haze. “I’m allowed to stay in classes as long as I don’t become a distraction—”

“Yeah,” said Kirishima.

“But I’m like, kinda owned by the class, too, without any mating bites.”

He nodded.

You vaguely remembered something happening with Mr. Aizawa, with Deku there as well, in the main living area of the dorm. You remembered everything later with Katsuki and Shoji and Ochako. 

“I think I’m okay with that. I mean, that means my needs are taken care of, and my education isn’t disturbed, too, right?” you replied at last.

Kirishima looked relieved at your response. “Yeah, exactly. But,” he added, “if you weren’t okay with it, I was gonna suggest we see about transferring you to Class B.”

You made a face, and he laughed.

“I just want what’s best for you, Mouse.”

“You’re such a mother hen, Kiri,” you said.

“Call me Eijirou.”

You froze. You called most of the other students by their given names, but hadn’t really thought to call him by his; everyone just called him Kiri. “Are you sure?”

“Katsuki already said he’s made his intention to bond you known.” He scrubbed the back of his neck nervously. “Well, I wanna throw my hat in the ring, too, so to speak.”

It was your turn to blush. “This is all a lot. I never had to think about this stuff when I was a beta. No one wanted to mate me—”

“Not true,” he insisted. “Bakubro still talked about mating you and maybe an omega or two, but how any omega would have to accept you. He’s been dead-set on you since we met.”

That was surprising. You’d have expected Katsuki to think of himself with a harem of omegas or something, what with the way his ego was.

And here he’d agreed to share you with the right people .

“I still didn’t really think about it. It was something that could theoretically happen, but… I’m a community creature. Now that I know I can mate, I’m gonna have to think about how many mates I’ll want,” you said. 

“That’s the good thing about someone like me. I don’t get possessive like the alphas. I’m happy to share as long as everyone does their part,” he replied with a grin. You smiled at his shark-toothed smile; it was contagious. “And I will always take care of you, even if you don’t choose to mate with me. Because, well, I care about you.”

“You’re a good guy, Eijirou.”

As his name slipped from your tongue, you saw something in his eyes darken. The smile faltered. He laid a big hand on your thigh, and you suddenly remembered that you were naked. You’d been lying there naked, having pillow talk with Kirishima, the whole time, and at no point had it struck you until now.

He rubbed your bare flesh, and you felt something stir inside you. Your heat was rising again.

“Don’t mistake me being a nice guy for not wanting you, though. I definitely do,” he said, leaning over to murmur the words against your lips. He brushed his lips softly against yours, and you whimpered. “You want me, Mouse? You want me to help you?”

You nodded. A wave of need spread through you and you grabbed onto him.

It must have reflected in your scent. Next thing you knew, Eijirou was on top of you, pulling the sheet away and stroking big hands down your body.

“I have more control than the alphas. I can take it slow. What do you need, beautiful?”

You stared up at him with wide eyes. No one had asked you this yet; were you even capable of speech right now? You leaned up to kiss him, but he flattened you with a hand on your chest.

“I’m gonna need you to say it for me,” he said, a gleam in his crimson eyes. 

You shook your head.

“I can wait. You’re forgetting, I’m not like them. I won’t just fall on you. Tell me what you want, Mouse.” He stroked his hands down your side and you were overcome with need. When you only whimpered again, he lightly smacked your cheek. “Focus. Tell me. What do you want?”

“I–” You blinked through the want that was clawing inside you. “I want you to—”

“You can do it,” he promised. “I can leave, go get someone else, or…”

That wasn’t it at all. Panic competed with excitement. “I want you to fuck me,” you spilled out at the threat of him leaving you.

Chapter 12

Summary:

Sex with Eijirou

The large omega male leaned over you, into you, pressing a gentle kiss to your lips. It was completely at odds to everything about him— how overbearingly large and muscular he was, how he seemed like he could tear you apart with a thought.

But you would never have been afraid of Eijirou. He was always gentle with you, always the picture of kindness.

He pulled away to speak against your lips. “You sure this is what you want, baby?” he murmured. You nodded, eyes wide as you stared up into red irises swallowed by black pupils. 

You nodded. “I’m sure, Eijirou.”

He groaned when you said his name, then slid down the bed. Your frowned. “What are you—”

“Preparing you,” he said. “I’m gonna show you the difference between alphas and me. Just hold on tight, Mouse.”

He spread your legs and settle between them, ghosting his hands up your thighs, then leaned in and took in your scent. “You smell so good. I’m gonna enjoy this.” And then his mouth was on you and you were lost.

He swirled his tongue around your clit, his hands keeping your thighs from closing around his head as he stared up at your reactions. One hand left your leg to play at your entrance. A thick finger pushed in. 

You gasped and writhed in his hold so he had to readjust, placing his forearm across your pelvis to keep you in place for his feasting mouth. And feast he did. His teeth nibbled, his lips sucked, hip tongue flicked. You were going insane as he pumped his finger in time to his mouthing. And then he pushed a second finger in.

You bolted up right, and Eijirou growled against you. He pulled away, the bottom half of his face slick from you, and said, “Lay back down,” in a tone you’d never heard from him before. It instantly had you obeying. You didn’t think it was an alpha command since he wasn’t an alpha, but you could no more have disobeyed than you could have stopped clenching his fingers inside you.

Eijirou pumped them steadily, feeling around until he knew what your body craved, and then his mouth was on you again, sucking and nibbling, tongue caressing. 

Your hands darted to his spiky hair. It was oddly soft and the roots, where you threaded your fingers through, much to his delight. He hummed against you and pushed his head against your palms to encourage you. 

With your legs now free, your thighs bracketed his head, but Eijirou kept you in place easily with the one arm on your pelvis. He pushed you toward an orgasm that had you seeing stars, letting you ride his face through it, his mouth slowing so it was just this side of overstim.

And then he pulled away, sucking his fingers clean as you blushed hotly and panted.

“Now you’re ready for me,” he declared, shucking his clothes to your floor. Your eyes widened when you saw his cock, bigger than you remembered the ones before being. “Don’t worry. I won’t pop a knot in you at least,” he said as though that would somehow make it easier for you. Then he was nudging at your entrance, slowly, gently pressing in. He scooped your legs back and pumped in and out until he was mostly seated, then he pushed forward over you so he could meet your mouth in a hungry kiss.

His tongue swiped at the seam of your mouth until you parted your lips for him, then you could taste yourself as he roved you at a langurous pace. He was unhurried in his exploration and in the way he thrusted inside you, taking up space in your body.

It was so different from the fast pace of the other boys, so methodical. You melted against him and into the bed.

With your relaxation, he was able to finally fully enter you; his thrusts became rougher, harder, so that you wondered if you’d bruise, not that you minded. In fact, the idea was exciting. 

You found yourself wanting his fingertips to leave bruises, his hips to leave an impression on your body, his cock to carve out a spot inside you.The way it filled you was perfection itself, hitting every spot exactly as you needed so that soon you were keening, digging your nails into his back to spur him on.

“Just like that,” he purred. “Yeah, baby, keep tightening around me like that.” And you couldn’t help yourself, you did exactly what he said.

Your heels drove into his muscular back as your nails clung to his flesh.

You wanted him to cum in you so badly, wanted him to fill you up until you were dripping his seed. “Please, please,” you begged.

“Yeah? Tell me what you want?” His voice was that deep growl that you couldn’t help but obey again, and so you replied.

“Cum inside me, Eiji.”

“That what you want, baby? You want me to breed you?” 

You moaned. “Yes, please.”

Eijirou pushed your legs back by your head and pummeled into you deeply. You could feel him, see him moving inside you, see your stomach with every thrust. He laid a hand on your lower stomach to feel himself there and groaned. “Right there, I’m right there, baby. I’m gonna fill you up now. Are you ready?”

You nodded and he wrapped his arms around you to keep thrusting as hard as he could as he rode out his orgasm. You were hit with one of your own as he kept driving into that sweet spot and you dove forward to lock your teeth onto his shoulder.

“Fuck!” His big hand squeezed you tight. “Yes, please, yes, mark me.” Your teeth remained locked on him, though not on one of his scent glands, until you both came down from orgasm, and then he rolled over to spoon you from behind.

You wiped your mouth and found your hand red with blood. “Oh, god! I hurt you!”

“It’s okay, calm down now,” he said when you started to freak out. “I liked it.” He turned you to face him. “Look, I take it as a compliment, okay? I’ll take good care of the bite so it heals well, I promise.”

You frowned. “You’re sure it’s okay?”

He nodded and grinned down at you. “It’s more than alright,” he assure you, leaning down to kiss your forehead. “Now just try and get some rest, alright?”

Notes:

So there are two types of Omegas in this: one is the typical type wherein the women are hyperfertile and the men come across as effeminate (but they are not fertile in my omegaverse, sorry, and women only have one uterus as well); the other, more rare omegas are like alphas on steroids but still with the nurturing aspect--- they're almost intended to be guard-types in case of abusive alphas. Kirishima is one of these; they usually match well with other omegas.

Anyway, who next?

Notes:

This is an update-whenever-I-feel-like-it story. No plans, nothing. Anyone on-screen is a possible partner during it. Requests?

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