Chapter Text
Panting, sweating, soft tears rolling down your cheeks. This is not how you wanted to start your fall season.
Your face pressed against your pillow, barley able to open your eyes you felt a shiver rock through your spine, naturally arching as any touch to the space in between your legs felt like electric shocks straight to your nerves, this was NOT how you wanted this to go.
Maybe there’s still a chance, you wondered, maybe this is how all alphas feel during their first ruts…
But then as if your body had heard your desperate attempt at still holding out hope for something different, you felt a glob of slick gush out of your hole, your entrance winking tightly around the slick coating the inside of your intestines
“Fuuuuck…” you groaned as a shock of pleasure came over you. There was no doubt now, you were an omega and this was your first heat.
Aka, you’re fucked.
“I have to go…get dad” you sniffled as you pushed yourself off your bed and stumbled onto your feet. Leaving your room your nose was sensitive to all the smells of the alphas in your house, your dad, your other dad, your brother and your aunt, you had a whole pack house full of alphas and you were expected to be the next it seems life had other plans for you however..
“Dad…?” You walked down the halls, the scent of him growing stronger “daaaad…!” You cried, you could smell a spark in his scent as you rounded the corner and he turned to see you, then was immediately hit with your changing scent
“Oh god-“ Aizawa stumbled back and covered his nose, your smell too strong for him to be faced with so suddenly, it was a shock to his senses and his inner alpha, both thrown back in confusion as he smelled your stress and uncomfortably, confused and stunned by the overwhelming need to soothe a unhappy omega but also be the stern alpha father he always has been to you “Y/N, y-your not looking so hot. Come here let me see you, pup.”
Aizawa reached his hands out for you as you stumbled over to him, he was glad he woke up so early so you and him could be the only ones in the living room by now, if your brother smelled you in this state he might not have the experience necessary to control himself…
“I-I was supposed to-to be an A-alpha~!” You cried into Aizawa’s arms. You weren’t one to cry very often but now your emotions felt ten times stronger then ever before, you couldn’t even stop yourself from holding onto him and crying into his shoulder
“Oh Y/N, you poor thing” Aizawa sighed as he looked down at your teary eyed form as you seemingly crumbled under your own weight and distress “it’s going to be alright my child. You’ll be alright, it’s really not that bad…”
“Says you!” You shouted, hiccuping as his eyes widened “you’re an alpha! I was supposed to be an alpha too! I-I don’t want to be some weak omega!”
“Omegas aren’t weak, we don’t live in the 1920’s anymore Y/N, you’re going to be just as strong as before…it’s just going to be a little harder then before..”
You didn’t want that answer, you wanted Aizawa to tell you that there was some magic shot he could give you to make you into an alpha over night, but he didn’t, and as your eyes welled up with tears at his response his pale tired face and black hair wobbled in view, he sighed heavily and pulled you back into his arms, pooling his comforting alpha pheromones over you as he rubbed your back softly
“Alright alright” Aizawa glanced back to Hizashi’s closed bedroom door, noticing the time was getting close to when everyone would be getting up for work and school “listen, I’m going to call off today to take care of you, omegas can’t go through their first heats alone or it has a pretty bad effect on their development, but first I’m going to talk with the others and go to the store to get some stuff for you. You need to go run a bath for yourself and relax okay? You’ll be stuck like this for the rest of the fall season so it’s best you settle in now.”
“The whole season-!?” You shouted, this time he held on tight to you to make sure you couldn’t leave his warmth again, something even he seemed to not realize he had done until you were unable to break away “b-but I can’t be like this the whole season- what about school? What about my friends-?!”
“You’ll obviously be given a break from school, just like how alphas get their rut seasons off each year you’ll take the fall season off from school every year, homework and grades and all that stuff will pick back up once your better, Y/N. You should know this by now” Aizawa sighed “Do as I said pup. I’ll be back soon to take care of the rest”
You blinked and looked up at him, his mouth filled with saliva at the sight of your bottom lip quivering and your pupils all blown out “w-what does take care of the rest mean..?”
Aizawa swallowed heavily
“…you’ll see, just go run your bath already.”
-
Two hours go by, your bathed and still covered in sweat that sticks to your skin like glue, your stomach grumbles despite eating 15 minutes ago and your legs haven’t been able to close since you threw yourself on the bed to cry.
You should have been crying over the frustration of being an omega or maybe even being upset that you suddenly were not going to see your friends for a whole season with no chance to say goodbye, but instead all you could think about was how badly you felt you needed something- anything -in between your legs deep inside your core. You twitched and shivered as more slick coated your inner thighs and bed sheets with a gross sound that made you blush harder than you already were before.
This was hell and you had no idea what your father was going to do about it.
Your bedroom door opened suddenly as the devil himself walks in with a plastic bag and a worn out look on his face, mumbling something about needing to suddenly hire a substitute in the middle of a lesson and whatnot.
“Are you okay?” Aizawa asked as he set down the bag and put his hand to your sweaty forehead “how’s your vision?”
“Uhh…delayed?” You panted “and spinning…”
He chuckled softly at that and sighed “yeah you got hit with it good kid, I’ve heard the first is always the worst though so hopefully next time you won’t be so immobilized”
Aizawa dragged over your desk chair to sit on with a exasperated sigh “went to the store and tried to find some suppressants strong enough to do anything this late into the cycle but when I asked the pharmacist she looked at me like I had two heads so…looks like we’re gonna have to do this the hard way, kid..”
“Hard way..?” You raised a brow “what’s that mean?”
Aizawa avoided your gaze for a moment, fake coughing a moment and then leaning down on his knees in the chair “uhm- well it’s just the same way anyone else would..” he seemed to search for the words “y’know, the obvious cure…?”
You blinked as your brain stalled a moment, the obvious cure? But wasn’t that just…sex?
“…I don’t think I know what you mean, dad” you weren’t sure what you were expecting him to say next but he didn’t seem to have any other way to put it.
“Sex.”
He said the word sternly almost, like he was putting something on a table with a slap
“But it doesn’t have to be difficult, Y/N, it can be easy and professional..” he twisted the words by tone, like he was mulling it over “I’m your father which means there’s no reason this can’t be done with peace of mind, sometimes that’s just something parents have to do for their kids, some families even prefer to do it themselves for their first heats! A bonding experience or something..” Aizawa scratched his neck slightly.
You knew this was something some families did, there were whole religions that made families only do it, but you weren’t that kind of family and you also never expected you to be an omega in the first place so everything felt like it was rushing by you at a million miles an hour
First you suddenly become an omega over night, you’re hot your cramping and your stomach is doing flips.
Second you find out you’re going to be missing an entire fall season of school and work and hanging out with friends.
And now thirdly you’re going to have to get closer than ever before.
Your family never hated each other but there were many times your house felt like a war zone. Your brother and father were both two stoic and stern alphas that were incapable of handling change or any disobedience in the rest of the family and there was also the fact that your parents were never just touchy or bond-y with you or your brother, it was always fleeting dinners with light conversations about the day rather then loving hugs and vacations.
“D-dad I…I don’t think I can handle that with you…” you said, gaining the second wind to sit up and look at him with earnest “could you maybe just call in Shinso…”
You weren’t close with your brother either but at least you two knew each other a little better then you and Aizawa, you and Shinso grew up together, played together, go to school together, you both suffered under the wrath of Aizawa’s stern expectations for you guys and got used to Hizashi’s teasing spiteful nature. He would probably laugh at the fact you were an omega but Shinso wouldn’t shame you for it, not like Aizawa’s eyes seemed to hide behind them, a string of gleaming shame that one of his kids turned out to be an omega rather then a big strong alpha hero…
“Shinso? Why would you want him?” Aizawa raised a brow, his tone steady but lacking in something
“I don’t know dad I just…I just can’t with you.” You said, not meaning to point the word at him like you did, but he seemed slightly taken aback when it happened
“…ah.”
“Is…is that okay?” You ask, shuffling back and looking to the bag on the ground nervously
Something shifted in the room, your scent washed over him as uncomfortable and his now vulnerable and empty, the two smells dragging through each other like a spiraling mist
“Of course not Y/N.” Aizawa said, crossing his arms and looking at you “Shinso is already skipping school all summer for his own rut, he can’t be missing fall too just because of you.”
“But you can miss teaching?”
“Yes I can because Shinso doesn’t make me miss school during summer!” Aizawa says as if that was obvious “you think I’m going out getting Shinso snacks and heat pads during his rut? No, he just stays in his room and takes care of himself.”
“Okay okay, I get it!” You lay back down with a sigh, pulling the covers over yourself tightly, if you could burst into a ball of flame right now to avoid the embarrassment and uncontrollable-ness of this moment you would have five minutes ago.
Aizawa sighs and shakes his head, pinching the bridge of his nose then looking down at the bag on the ground “…listen, it’s alright, how about you just let me take care of this as quickly and painlessly as possible.” Aizawa stands up and walks over to the bed, pulling the sheets off of you with a surprising amount of force
You yelp and turn around to face him and jump back on your bed. He blinks at you from his towering size, looking down at you with those cold and annoyed eyes he always has when he looks at you “wait wait-“ you shimmea back and try and pull the blankets back to you, your clothes might be on but somehow his gaze makes you feel naked and vulnerable already “I- seriously I don’t think I’m ready for this-!”
“I’m not sure what other options either of us have, Y/N.” He glares “don’t make this harder for the both of us, if you just lay there and relax I can get this done in just a few hours before we have to go again.”
His words do nothing to soothe you, in fact you’re eyes go wide and you feel more like a trapped rabbit as a wolf stalks closer with its fangs bared rather then a father and their child trying to fix an issue together
“Dad stop, give me a minute I-“ suddenly Aizawa grabs you by the scruff like you were five again and drags you back to the middle of the bed where he pins you down so your face presses against the pillows again
“Y/N.” His voice is stern and straight, his scent dominating and powerful. You feel like a child again being put in your place when you would talk too disrespectfully to either of your parents in the past “Your letting your nerves get to you. I won’t let you drown this out, the longer we wait the worse it’s going to be. You just need to lay down and let your father help you.”
You’re scruffed, dripping slick, and on the verge of tears, this wasn’t how this was supposed to go. You should have been an alpha, this should have been your first rut, instead your laying under your dad as he strips away your blanket, your shirt, your pants and finally your underwear.
You can feel his hands slide down your back, lighting a trail of nerves behind his fingers, he palms your rear for a moment, seemingly letting his inner alpha get the best of him in the moment and do a little more then a professional job. He wakes from it and shakes his head as he takes his pants off
“…it’s not all bad being an omega” Aizawa says, his breath suddenly hotter and his pupils blowing out slightly “…soon you’ll be just as good looking as your other father…he’s such a perfect omega”
He spits into his hand and reaches down to slide a finger inside your entrance, you yip as it slides in too quickly. He adds another with no warning “I’ll stretch you out pretty far so it’s not painful.” It isn’t long before he fits four fingers into your hole, it’s eager to lewdly suck in anything Aizawa gives it, including his whole fist.
You yelp and gasp out as Aizawa’s entire fist is dredged deep inside of you, slick gushing around his wrist making a ‘Gwwwck-‘ sound in your stomach as he pulls back, your hole clenching over his wrist keeping it in. He feels every throb and pulse inside of you as you arch your back, he reaches too deep and finds your submission gland, seeing as this was your first heat it probably developed in you just days before and was still extremely sensitive, as his knuckles run over the smooth gland all your walls clench at once and you leap up with a cry
“Oh fuck-! Stop wait- t-too much-!” You claw at your bed frame trying to get Aizawa to pull out of you, he yanks you back by your ankle and suddenly opens his hand inside of you to press his fingers against the gland harshly
You see stars in seconds, your eyes roll back and your whole body starts shaking, it’s so much it’s actually painful as you’re forced limp and quaking while he continues to beat at it with the pads of his four fingers
“This will go by a lot smoothly if you just relax, Y/N. Just let go and submit.” Aizawa growls the last words, you can’t make any working thoughts as pleasure and pain radiate through you, your head almost feels numb while the rest of your body is suddenly ten times more sensitive
“That’s better” Aizawa purrs, pulling his hand out with a loud wet pop and smacking your ass once with a soft chuckle, you do nothing but pant and watch as the walls spin around your room
If the distant sounds of clothing being taken off were made behind you, you couldn’t hear them. All you could do was stare blankly at the pillow and bed frame feeling the zaps of pleasure that still came from your dripping gaping hole. You’re had never had an inner omega until this moment of course, so when you heard a voice in your heard telling you to beg for your fathers big fat knot you thought nothing of it
“…Daddy…”
Aizawa stopped just as he begins taking off his boxers
“…daddyyy…want…your knot…please alpha daddy…”
Aizawa’s inner alpha reared forward as he listened, his pupils blowing out entirely as his fangs began throbbing in his mouth
‘Need mate…’
‘Need soothe…’
‘Need omega…’
Aizawa smirked as he pulled his boxers off with so much force they ripped between his clawed fingers, still wet with your juices
“Fuck…Y/N…Jesus you sound just like Hizashi…” Aizawa panted as he imagined his mate laying before him like this, you looked just like him, panting, teary eyed, quivering with nervousness as Aizawa pinned you below him and aimed his sharp headed cock to your sweet sweet entrance “…God your beautiful…”
Aizawa leaned down and rolled his tongue over your sweaty scent gland, you moaned and gripped the pillow panting and shuddering softly as Aizawa’s cock pressed inside of your throbbing heat, your eyes rolled back and you moaned out louder then you ever had before as he fed it into you inch by inch, all 10 inches of his cock dragged through you at an achingly controlled and slow pace, the top of his knot squished against you as you panted under him, whimpering softly hoping I’d lure him into fucking you faster, but Aizawa was not fully hypnotized, if you were his mate he may fuck you without restraint, pumping in and out of this perfect untouched hole without any care in the world, but he knew you weren’t that, you were his pup who moments before was telling him you wanted nothing to do with his help, you’d rather have your lazy brother knot you then your own father…thinking of that made his blood boil even if he wouldn’t let himself show it..
when you said you wanted Shinso to help you he nearly blew up right then and there, but he held his tongue and tried to be understanding, he tried to tell himself that it was just preference even if it couldn’t be helped, that you and him were somehow just closer then you and your own goddamn father who’s taken care of you, you’ve learned from, helped with anything he’s asked for, and been saved by on a multitude of times.
Somehow you and him were just closer.
but he couldn’t hold back his anger anymore, he felt like he needed to teach his pup a lesson on who was the better alpha even if he knew that wasn’t what this was about, he knew that was his inner alpha talking for him but with his cock buried just knot shy of your hot wet heat he couldn’t contain it much longer, so as his pup he would give you a good lesson on obedience and patience, along with basic respect for your alpha
“Tell me why you’d rather have Shinso.” Aizawa huffed
“W-wha..?” You couldn’t even think hard enough to understand what he was saying, why was he talking instead of fucking you already?!”
“I said, why would you rather have Shinso then your own father? Tell me or I won’t fuck you.” Aizawa kept his cock buried deep inside you as he waited
you blinked deliriously as he spoke, your inner omega working over time to try and make sense of his words so you could give the best answer to make him fuck you faster, what magic words he wanted to hear to get this over with and finally be given what you need
”Ssshinso…” You tried to speak “…Shinso…would…still like me if I was an omega…” you say words that your inner omega can only find at the forefront of your mind, speaking for you like a man behind a ventriloquist doll “Shinso…wouldn’t be mad at me…”
Aizawa listened to you but shook his head “what? What are you talking about I’m not mad at you?” He said surprised you thought that “why would I be mad at you for something you can’t even control?”
”your disappointed…I think. I wasn’t supposed to be an omega…I was supposed to be a pro hero one day…I was supposed to be strong…”
Aizawa would smack the back of your head if you weren’t overly sensitive right now, he wanted to laugh too but thought better than to “there are hundreds of strong omega pro hero’s, Y/N, you being an omega changes a lot but not how strong and capable you are. I’m not disappointed in you, I’m annoyed this happened at such a difficult time, it even makes sense to me that your an omega”
Aizawa went on, but you couldn’t understand him, your inner omega stopped listening around the third word and started contemplating how much trouble you’d get in if you just got up and went to Shinso’s room now, Shinso wouldn’t take as long as this old man. Lecturing an omega in heat is such an old man thing to do, your inner omega nearly cried out in frustration as he just kept talking and talking
”so it’s going to be alright, we’ll just have to switch things up a bit, alright Y/N?”
”Yes yes now can we get on with it already!?”
Aizawa blinked in surprise by your rushing but then chuckled dryly “oh yeah, of course..”
Instantly he pulled back and slammed his cock inside of you, he set a pace hard enough to jump you forward with every wet smack of his thighs against your ass but never enough to make you feel like it was enough
you cried out with joy, pleasure rocked through your entire system as all your pains turned into jumping nerves, his giant curved alpha cock sliding in and out felt hypnotic, you were surprised you only had two siblings!
His balls smacked against you roughly with every thrust, the sounds they made when the wet skin made contact was just downright disgusting, strings of slick stuck to his balls and pulled away with them as he pulled out until only the tip was left inside, then smacking back in pushing your cervix inside out over and over
Your squishy hole gushed and sucked Aizawa clean, it made it hard for Aizawa to keep his pace steady and his inner alpha from deciding that Japan’s laws for incest claiming were overrated, especially when the sounds you were making were heavenly…
you started purring so loud he was sure it was on par with the smacks, he glanced down at your sweaty face and smiled at the dopey rolled back eyes and drooling over dropped jaw you were making, it made it hard not to see so much of Hizashi in you right down to your tearing up eyes
his original plan was to get this over as quick as he could but somehow that plan went out the window when he moved onto the second position of the night, then the third, then the fourth. Soon he had you cuddled up in his chest while he fucked you for 30 minutes straight on top of him, not to mention how long the other positions took…
He was pulling you on, keeping you just far away from the finish line as he wanted you to be as he thrusted deep inside of you, deep enough to make your cervix suddenly open for him under the pressure
You cried out as his cock dived in and out of your womb, you gasped and clawed as he focused on making you cum
“Oh fuck-! D-dad I-I’m close again-!” You gasped out, your eyes opening with a wash of nervousness and built up tension running wild in your head, you’d had too many orgasms to count by now, you were just limply holding onto Aizawa’s chest for your dear life while he did whatever he pleased with you
“That’s it, come for me, hurry up!” Aizawa popped his knot inside you just as your walls gushed with slick, his heavy balls jerked up as he came deep inside your womb
You flopped down to the side of him, knot still throbbing and pumping cum into you as your stomach grew bigger with every ounce. You panted and felt your temperature cool, your mind felt less numb your heart steadied.
You felt satiated.
you both laid there for a minute, gathering your breaths and energy. If there was something you wanted to say to him it was gone from your mind, all you wanted was to sleep for three days now, pumped full and satisfied
Aizawa seemed ready to give you your space, panting and holding you with one lazy hand, when he did speak it was soft with a gentle tone “stay still” he murmured, then lifted up and reached over uncomfortably to grab something out of the plastic bag. He kissed your cheek gently before reaching down and carefully pulling his knot loose from your hole, slick and cum immediately began flowing out but suddenly a cold plug was shoved inside keeping the mixture in
He groaned as he stretched, sighing relieved and covering you back up in your blanket “you’ve got snacks in here, I’ll be back in ten hours to do it all over again, I’ll also be bringing you dinner when it’s ready alright? Here’s your TV remote, relax and try to enjoy your vacation from school as much as you can. When all this is over we will figure out what to do about you being an omega, okay?” He petted your sweaty hair before putting back on all his clothes and walking to the door
“Oh- before I go” Aizawa reached back into the bag and pulled out some sort of collar and leash “you’ll be needing to wear this when you leave the house from now on. It’s best you get used to it now” he pulled the collar under your neck and clipped it closed around you, then he turned around and left
Your eyes drifted closed and stomach made a grumbling noise as you softly purred in the background.
Suddenly you had the urge to build a nest