Alpha!Midoriya x F!Omega!Reader | Late Bloomer
May I please have a so-called beta Izuku (dormant alpha) having his first ever rut sending his omega fem s/o into heat then things seriously escalate to NSFW territory from there? Maybe Izuku’s hormone (testosterone) levels increased after winning a fight causing him to present (just a theory on why). Beta x omega would be taboo in omegaverse right? I also could totally see Izuku as a late blooming alpha. Thank U~
Warnings: fluff mostly! NSFW! It’s not noncon this time I swear! Dom!Deku
Hand holding with your boyfriend was your favorite part of walking to school together. You always were comforted with his fingers intertwined with your own. It made you more than content. You knew it was odd to others that you felt that way about a beta, but there was just something about having a sweet boyfriend who doted on you regardless of whether he had a strong scent or a knot.
Today, you were also feeling extra cuddly. You crooned and cuddled into his side, rubbing your scent into him as you buried your head to get any amount of his freshly cut grass scent in your nose. You cradled his arm against your chest, pulling fitfully while he blushed and stammered at the treatment and odd looks the two of you received.
Midoriya knew you couldn’t help your behavior though. For some reason, you tended to rub up against things around the same time every few months ever since you were pre-teens. It was a nightmare for your parents since you’d go around doing it to other kids, hugging them for far too long in a vice-like grip. He finally figured out why early on in your relationship though when you suddenly stopped attaching to friends and family and solely stuck to using him as your plush toy.
The overdose of affection was just a sign that your heat would come in a few days. It wasn’t unheard of for omegas and alphas to have pre-heat and rut signs: cramps, heat flashes, increased aggression, possessiveness, or nothing at all. He was just lucky that you had clingy. Even without being an alpha, he could really get behind this side of your omeganess. It was just so cute!
However, it was still a prelude to a bittersweet time that he didn’t know exactly how to feel about. Midoriya loved how sweet and needy you got for him when usually you were fairly independent. How you would cuddle him and run your hands through green hair. He couldn’t get enough when the two of you finally got alone.
Then, there was the leeward side of your heat.
The one where you doubled over in pain if you went without suppressants. It never seemed like he could properly satisfy you enough to kick you out of your heat early. It wasn’t that his size was the problem, he was surprisingly well-endowed in that department for a beta, or your pleasure since you always cried and spasmed around him each time, but rather his lack of a knot. Then, he was afraid that having sex might only serve to make your heat stall and last longer. So, you had to power through until it naturally declined and disappeared.
Midoriya couldn’t stand those days. It made him feel useless, and he couldn’t really figure out what made you sign on for that when you started dating him at first. Two years later though, you were still here and cuddling into his side blissfully.
You had arrived at school early and decided to head to the canteen for breakfast. Your table was empty as you awaited the rest of your friend group to show up, but that didn’t matter to you since you were too busy feeling up a flustered bean and snuggling into his hair like he was your personal catnip.
“Deku~ you’re so flufffyyy,” you giggled as his hand shook around his spoon, milk and cereal spilling back into the bowl. You weren’t the only one who noticed the behavior as two burly older boys spotted you from the table over, amusedly watching the display of an omega in obvious pre-heat mode.
“(N-Name)-chan, you need to calm down, we’re at school,” he stammered, blush intensifying.
“No,” you cooed and licked his cheek, and he had to stop himself from falling over the edge of his seat in his embarrassment.
A laugh could be heard from the next table over. “Having trouble over there, buddy?” the taller of the two boys asked.
”Don’t let her jump you now! No still means no for omegas, too,” the other jokingly added.
“N-No, it’s fine!” Midoriya answered, pushing you down a little to stop you from climbing on top of him right there. “I got it covered.”
The two laughed, and the shorter one decided to invite himself over to your table to strike up a conversation or perhaps enjoy breakfast and a show. He stops though upon closer inspection. Your scent dominated over Midoriya, his completely erased with your own.
A scowl etched at his lips. “Are you two dating?”
“Mhm,” you hummed and inhaled deeply over Midoriya’s scent gland, too preoccupied to worry about the slight sneer the question was asked with.
“That’s just precious,” he said with a soft smile in your direction. Izuku smiled weakly and rubbed the back of his head, feeling a bit shy about the compliment until he opened his mouth again to mockingly state, “You must be the sweetest little omega to want to cozy up to a beta like that.”
Izuku tensed, smile dropping to a scowl. You followed suit, holding onto him, but your expression was less than friendly. Your good mood ruined.
The taller alpha tilted his head, furrowing his brows, his eyes squinting in thought. “No wonder she’s going crazy, she’s probably starving on beta cock,” he thought out loud, a genuinely confused personification of the “but why tho” meme, then addressed Midoriya, “Do you even know what to do with her?” he asked curiously.
”It’s none of your fucking business, piss off,” you grunted, hoping they’d drop the subject.
“We don’t mean anything by it, we just wanted to make sure you’re getting treated right,” the other says matter-of-factly, saving a softer tone for you than the scornful one he held for Midoriya.
It didn’t matter whether they meant offense or not. They caused it immediately when Midoriya pursed his lips and went quiet as he retreated into his own head.
You pouted, heart aching and anger growing at the way your boyfriend bowed his head. His hands clenched at his pants legs, and his teeth sunk hard into his bottom lip. You hugged your arms around his waist and settled your chin on his shoulder. “Just ignore him, Izu, he’s just jealous that the only action he’s getting is with his hand,” you say, throwing a sharp glare at him.
“What did you say to me, omega?”
Midoriya scowled. He clenched his fist as their attention directed towards you. He could deal with himself getting harassed, he’s had years of training in that department dealing with Katsuki and the other kids in middle school, but—
“You heard me, knothead. No one invited you over here in the first damn place,” you mouthed off again and gave a low growl.
—he was never one to let someone else get bullied or unfairly talked down to, especially not his girlfriend.
“Who the hell do you think you’re bucking at?”
“You, fuckface. Now back off before I lose my fucking temper.”
“Seriously, you want to fight? You have to be kidding me, your parents must be fucking dying at having a butch omega for a kid, no wonder you can’t get an alpha,” he spats, and it’s the threatening growl that sets Deku off. He stood in front of you, arm held out low where you sat.
“Who do you think you are—talking to her like that! You don’t know anything about (Name) and don’t deserve to. You’re angry, acting out because you’re afraid to see people not feeding your ego by following your rules, and you can’t face the fact that no matter what you are; at the end of the day she still wouldn’t choose someone like you!”
You scowled behind Midoriya, glaring down at the intrusive alpha the same way Izuku did. There was a silence in the air for the few tables around you as they looked on, ready to see any sort of fight.
A fight is what they got when the resounding hit of a punch rang out, and you jumped up with a gasp as Midoriya stumbled back, clutching his hand to his nose. “Deku!”
“I’m fine!” he growled, swiping the back of his hand to wipe the blood away from the wound given to him. “It didn’t hurt!”
“You felt nothing yet, runt!” he spat and geared up to punch Midoriya again to show him how much his punches “didn’t hurt”.
You knew Deku was much smaller in frame than some of the other guys. You were a bit worried when green eyes met yours, but you had to remind yourself that even though he was small, he had muscles under that uniform blazer and could fuck someone up if need be, and everything burning inside him at once told him it was needed, much more so than usual as he blocked the punch and tackled down his rival.
Midoriya won’t deny the satisfying feeling and rush of power when his fist contacted bone and cartilage. It all went blank then. He ran on pure instinct, blocking out the yells and jeers around him. He kept enough sense to not use his quirk, but that didn’t slow him down from fighting with his own strength even after a hit broke through his barrage and nailed him in the face. Caught off guard, he was flipped over onto his back, becoming the submissive fighter now.
“Izuku!” you called to him, and his heart raced as you got closer to tear the bigger boy off him. You grabbed under one of his arms and moved to pin down the other, but his elbow came back mid-punch and nailed you in the cheek, and you backed off with a hissed, “Shit.”
You didn’t seem obviously hurt or much fazed by the hit other than your shock, but it didn’t matter when you got touched, when this asshole thought he could get away with that, to Midoriya’s omega.
Midoriya growled and thrusted the alpha off before pouncing to straddle him. “You’re going to pay for that!”
You winced with each hit, you’ve never seen him with that type of aggression. “Hey, Izuku…” He wasn’t paying attention. He was almost acting like a feral if you didn’t know better. It wasn’t normal, and you finally had enough when you heard the weak whimper from under him. “Izuku! Stop, I think he gets it!”
You grasped onto Izuku’s back, hugging him a little. He paused when your arms wrapped around him and your scent hit him so strongly for the first time in his life. He breathed heavily, gulping down at the bloody face under him before he gasped and quickly scrambled up onto his feet.
You pulled Izuku closer to the crowd, as he panted and calmed with the feel of your fingers slipping between his own. The taller Alpha ran up to his friend, kneeling and patting his cheek to coax him back to the conscious world. He groaned, and you were a bit relieved that he opened his eyes, even if he deserved it.
His friend smiled weakly before chuckling out at the bruised face of the student on the floor. “Dude…that little guy fucked you up.”
“Shut up, you dumbass!” the alpha cursed, popping up as the other students laughed. “You just fucking sat there and let it happen!”
“I thought you had it, really.”
You grimaced, holding onto Izuku tighter as you wondered what just happened. You didn’t have much time to consider it when you saw long black hair and a tired, irritated face breaking through the crowd.
The two of you sat alone in your desks in an empty classroom. You sighed, hating in school detention. You were supposed to be learning some really cool things in class today. Instead, you and Midoriya were both being punished. You didn’t use your quirks, so it lightened your sentence to three days of detention.
You glanced to Midoriya, still rigid at his desk. His nails dug against the edge impatiently. His expression tense and he himself silent, only groaning a bit when he would drop his head to his desk and rub against his forearm. You sighed. This is all that assholes fault.
Midoriya’s tension wasn’t from that though. He was more concerned about the boiling in his blood that had him physically sweating under his collar. He long tore off his blazer and undid a few buttons. Fighting for control, he focused on trying to keep his breathing steady, but oxygen suddenly felt too thick to swallow down while his stomach kept aching each time he inhaled your suddenly heavy scent. Always, you said your scent was like coconut, specifically the milk, and he never realized it smelled so good in his life until now, especially as you scooted your desk closer to his.
“Hey, I’m sorry I got us in trouble, Midoriya,” you mumbled and placed your hand on his shoulder. “You’re not hurt, are you?”
“No, I’m fine,” he huskily drawn out. You blinked at the deep, heavy voice given to you and leaned over to get a look at his face.
Midoriya didn’t know why he was suddenly thinking it now, but you looked good with your hair a little messy from the events of the day, and your thighs widening out against your seat, giving an exaggerated sense of fertile feminine curves. Your lips looked good enough to kiss and bruise red with bites right about now. He just really wanted to bend you over the desk and pound you raw until—shit, what is he thinking. You’re in school.
But when you wrapped your arms around his shoulders and start your cuddling procedure again, your frame firm but soft against him, those thoughts all go out the window.
Midoriya reached out and clasped your face suddenly. You were pulled into a rough, uncontrolled kiss. Instead of growing more passionate, it started that way, hot and heavy as his tongue glanced over you.
“D-Deku?” you questioned, eyes widened as he pulled away and protectively slid the flat of his tongue across your cheek where you were hit like you were a preciously wounded animal that he had to take care of. You didn’t reject the attention, in fact, it was exciting, but you pushed away because of the odd behavior. “What’s gotten into you?”
“I-I don’t know,” he growled lowly against your lips, and you were shaking at the dropping octaves. He kissed you again, a bit more conscious and steadier as he stood and gripped your shoulders. The desperate grip almost hurt, but your whimper was swallowed down with hungry lips. His hold fell down your shoulders, rubbing up and down your biceps, slightly more comfortable. His chest rose heavy. Rapidly, it rose and fell against your own as he pulled away before rushing back to bite your bottom lip.
“I love you so much, (Name),” he whispered and smothered your neck in kisses.
“I lo—” you couldn’t get a word in edgewise as he kept kissing you, “ve, y-you, too,” you moaned and tilted your head. He took the opportunity to mark your neck, one spot at a time, though it didn’t take long to have a ring around you with the desperate speed he went at you.
“Deku,” you gasped when he fully squeezed your breasts through your school uniform, folding the fabric of your blazer in his hands before hastily undoing the buttons of both it and your shirt underneath. The ones that break off in his rush, lightly clacker against the floor and roll away to hidden corners.
Izuku pulled you up out of your seat, cupping your ass and hopping you up higher on his waist before settling you against the desk. “(Name), grind against me,” he demanded, nipping at your ear. You gave in easily to his demand, rocking your hips against his rock-solid cock. And fuck, you don’t know what’s gotten into him when he kisses and bites at the exposed tops of your tits but you’re not complaining when the smell of grass fills your nose again.
It was so…strong and heady and…Alpha.
So tantalizingly alpha as it mixed with something else your vaguely recognized. It had your body flooding with familiar hormones that had slick soaking through your panties. You didn’t think your heat would start so soon, you always had a few days in advance, but he was driving you mad. Your alluring smell only made him buck harder, and you yelped in his ear.
“(Name)-chan, you smell really good,” he said and tightened his hold around your back to get you physically close as possible. You think if he could melt into you, he would, and you’d gladly do the same.
He knew he was bad for your heat, but he couldn’t stop himself from pulling at his zipper and thrusting his pants midway down his thighs. You quickly sat back and did the same with your panties, letting them slide down your ankles. You didn’t bother to waste time kicking them off. You both needed each other now.
Your body trembled, and you gasped in the pleasure of having his much-needed cock inside you, immediately pulsing and ramming all the way back in one fluid jerk of his hips. “DEKU,” you screamed into his shoulder as he gripped on your hips and repeatedly buried himself inside your desperately clenching cunt.
You held onto him, bouncing back against the desk as he thrusted up into you. You always felt good during sex with him, but this time felt different in an exciting new way. From his sudden dominance to his thick scent, or guttural grunts, you didn’t know which and didn’t care as you finally kicked your undies to the floor and wrapped your legs around him. The room filled with the slapping of skin and smell of raw sex as your juices flowed in between your legs, squelching with every thrust. It was drowned out by both your moans as Izuku snapped his hips into yours, refusing to pull out of you for long before stretching you back out and making you cry with the quickly building force of your orgasm.
Something foreign drew against your body. It pressed against your entrance and ground against you with the rock of his hips. It wasn’t quite big yet and you moaned as it slid into you, locking for a moment before he pulled back out. You vaguely wondered if he was about to knot you.
You whined as he pulled out of you, breathing heavy as he tried to catch his breath. You only had a small amount of time to gaze down at the base of his slick drenched cock. You clearly saw the bulb of his expanding base there. “Deku,” you breathed out, the dark look in his eyes said he’d figured it out, too.
“I’m sorry, (Name),” he huffed out, and you were unsure why he would apologize before he suddenly flipped you over the desk and onto your stomach. You cried out as he plunged back into you at a jackrabbit speed. “I-I can’t stop,” he apologized, squeezing you tighter as he closed his eyes and got lost in the feel of your walls hugging tight and wet around him.
Being bent over made everything squeeze and he felt twice as big going back inside you with one hand gripping your hip to tug you back against him and the other gripping the edge of the desk to steady himself as he pounded into you.
You felt pleasantly numb, as you buried your head in your arms to muffle your cries as you came around him. His first knot took a bit of time to swell up right, but once it did, you skipped past cloud nine, ten, and all the way to cloud 99 as it beat at your aching pussy before giving you what you needed—a full cock and knot burying balls deep inside you. Midoriya groaned, stilling and resting his forehead against your back as he spilled against your cervix.
“I’m sorry, (Name),” he panted, rubbing a sweaty forehead against your shoulder as he gently rubbed his fingers through your hair. “I didn’t know it would happen this way.”
“It’s okay, i-it felt amazing,” you sung out. “I didn’t think people presented so late.”
Midoriya nodded, not that you could see that or the bitter smile that followed. “I can finally make your heat go down now,” he commented jokingly, but you recognized the self-deprecation and the distance that rode on those words. Midoriya hated knowing at the end of the day, he was never able to make you this relaxed during without a near hour of build-up. He was relieved he finally could, but it also nagged at his mind that he really wasn’t good enough when he thought he was a beta.
“Deku, y-you know that didn’t matter, I’ve been in love with you since we were kids. It never mattered to me if you were an alpha or not, I just liked you because you were you and you made me happy,” you reassured him, wishing desperately that you could see his face more clearly as you turn your head to the side and look up at him from the corner of your eye. “And like you said, I’d would’ve chosen you over an alpha any day,” you smiled sweetly, and his cheeks darkened. “So, will you please kiss me now? I can’t really do it bent over like this.”
He nodded and pressed a kiss to the corner of your lips, gently combing through your hair in the meantime as he waited for his swelling to go down. Midoriya smiled weakly and rubbed his wrist at wet green eyes. He had no idea how he managed to get so lucky in life to have you. “I love you, (Name).”
“I love you, too, but I think we have some time to make up for,” you teased and rocked back against him again, making him moan as you spasmed around his knot.
“(Na-Name), you can’t do that so suddenly. I’m still not used to this,” he hissed and rutted back into you. “S-Shit,” Midoriya growled as his knot loosened and slipped out of you.
Watching you leak with a mix of your cum, he immediately burned with a foreign desire to knot you again and again. Fuck. He supposed he would have to spend the next few days in detention learning something. Practicing on fucking you through your heat seemed like the perfect lesson.
You licked your lips, wantonly, and refused to slow down as you wiggled against his lap. “I need your knot, Deku,” you whimpered, and his blood began to boil again.
“I-I won’t hold back then,” he replied before gripping onto your waist and giving you both what you needed.
