Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/ works/12443241. Rating: Explicit Archive Warning: Underage Category: M/M Fandom: Haikyuu!! Relationship: Hinata_Shouyou/Kageyama_Tobio Character: Hinata_Shouyou, Kageyama_Tobio, most_of_the_team_shows_up_but_they_don't have_significant_roles Additional Tags: Alpha/Beta/Omega_Dynamics, Alpha/Omega, Omega_Verse, Alpha_Kageyama Tobio, Omega_Hinata_Shouyou, Omorashi, Watersports, Fluff_and_Smut, submissive_urination, this_is_omegaverse_pissfic, hinata_and_kags_are_17- ish Stats: Published: 2017-10-21 Updated: 2018-01-23 Chapters: 2/3 Words: 3514 ****** A Natural Reaction ****** by darkmilko_(FreshMilko) Summary It’s perfectly normal behavior for an omega to urinate in submission when intimidated by an alpha. That’s just physiology. So Shouyou may have always had accidents a bit more frequently than any of his peers, and maybe he’s a little too old to have not outgrown this problem… But really it has never been that big of a problem... Until he met Kageyama Tobio. This is a fill for the hq kinkmeme, "omegaverse with an omo twist" but with added fluff bc im weak Notes Based on an old prompt on the kinkmeme, I've been thinking about writing this fic for a looooong time. And now it's finally happening. I've tried to avoid the creepy rapey tropes that are common in omegaverse, but fair warning there's still a lot of instinctual behaviors bc I love them. Mind the tags, and I'll probably add more as I keep writing. See the end of the work for more notes ***** Chapter 1 ***** It’s not Shouyou’s fault. It’s perfectly normal behavior for an omega to urinate in submission when intimidated by an alpha. That’s just physiology. So he may have always had accidents a bit more frequently than any of his peers, and maybe he’s a little too old to have not outgrown this problem… But really it has never been that big of a problem. Until he met Kageyama Tobio. The first time was in middle school, during his match against Kitagawa Daichi. Shouyou didn't even notice what was happening until the end of the game, when he realized his underwear were uncomfortably wet. But still he chalked it up to sweating more than usual due to the intensity of the game and ignored it. Until Kageyama came right up to the net, looming over and barking harsh words at a defeated Shouyou. The newly developed alpha was releasing waves of scent and aggression that completely overwhelmed Shouyou, who had also just recently presented. He stiffened at the way his body reacted, instincts wanting nothing more than to fall on his knees and bare his neck in submission. That scent - like spice, smoke, and ozone - flooded Shouyou’s senses. He couldn't help but release a whimper and felt his bladder loosen before he could help it, some pee leaking out. It was all he could do to stand stiff, head bowed. He knew that if he even moved an inch he would lose control. The alpha angrily stormed away to line up. Shouyou slowly followed suit, and that was the end of the game. And yet he couldn’t stop thinking about it as he changed and got ready to leave. He couldn’t just leave it like this, right? He exited the building and saw him. Steeling his resolve and stamping down his traitorous instincts, Shouyou runs after Kageyama and plants his feet right behind him. And Shouyou yells, determined not to let this guy walk all over him just because he was an alpha. So maybe he was a better volleyball player, but that didn’t matter. Shouyou would practice hard and defeat him someday! As Shouyou shouts his challenge, he could only hope no one noticed the small, slowly growing stain on the seat of his shorts. Then the tournament was over, and Shouyou went home with a newfound determination. And that determination was effectively squashed as soon as Shouyou walked into the Karasuno gym to find his biggest rival had become his newest teammate. The smell, smoky, spicy sweat and musk, was the first thing Shouyou recognized. That scent and the commanding presence of the alpha as he looked over to where Shouyou stood were enough to set off his instincts. Knees weak and head tilted ever so slightly, he spilled again, just a bit, into his shorts. The first few days of being on the team with Kageyama were rough for the omega. Every time the alpha yelled at Shouyou he would leak a little. Of course in the beginning he only yelled, but eventually they became begrudging friends. That didn't stop Shouyou from pissing himself constantly around Kageyama though. It's just because Kageyama can't smile and it’s scary , he tells himself. It's because he's the king!! Of course he's intimidating! Peeing a little every time I see him is only a natural reaction coded by biology. It's not at all because Shouyou finds himself desperately attracted to his best friend. Kings are just naturally attractive! He's his friend, and a friend can tell when a friend is extremely good looking. It doesn't mean anything. So maybe when Kageyama yells or touches or gets to close to Shouyou he can't hold it all. Maybe sometimes when Kageyama just looks at Shouyou a little too intensely he pees a bit, but really, honestly, it doesn't mean anything! It's an omegas natural reaction, and Shouyou firmly convinced himself this hasn’t been a huge problem. A little uncomfortable and nerve-wracking, but Shouyou had it under control. He’s been able to keep his little problem a secret so far, due to frequent bathroom trips and probably plain good luck. Of course good luck always does have to run out sometime.   ===============================================================================     It’s near the beginning of their second year. With last year’s seniors gone and the arriving first-years having not yet signed up for clubs, the gym is unusually empty. Tanaka fills his role as captain well, if not a bit irresponsibly- letting his scent slip out constantly. Ennoshita, however, keeps him in check as Vice Captain. Practice is a bit strained as everyone gets used to the absence of their old upperclassmen, but it’s especially tough for Shouyou, though not for any of those reasons. Shouyou’s heat is coming soon, and he’s been having especially intense pre-heat symptoms. It’s not anything too bad, just some dizziness and fatigue. If anything the worst part is his heightened senses, the strain and fatigue in his body feeling that much worse, the smell of stress and sweat cloying in his nostrils. He should probably sit out, he knows it can be dangerous to practice while distracted, but he really doesn’t want to miss out on any practice. That turns out to be a mistake of course when a sudden strong whiff of Kageyama’s scent causes Shouyou to stiffen in the middle of a jump, landing on his ankle badly. Shouyou falls to the ground with a yelp, grabbing his throbbing ankle. Practice stops around him and everyone runs to where he sits, checking if he’s okay. Ennoshita comes over to help him stand on one foot, testing his weight on the other. “How bad is it?” he asks, worry emanating in his scent. Shouyou applies a little pressure and feels a twinge, but no shooting pain. “I think it’s okay. I think I just twisted it a little when I landed. I can probably walk.” And it’s true. He could probably even play, but even Shouyou knows how bad an idea it is to risk further injury. Ennoshita supports him under his arm and slowly walks him to the bench, releasing a soothing scent. Although Shouyou’s frustrated he has to miss practicing for at least a day, he’s a bit relieved to rest his aching, dizzy body. He watches the others for the rest of practice, despite Takeda Sensei’s urging to go home early. Even if he can’t play, he doesn’t want to miss any practice. Shouyou can’t help but notice Kageyama’s scent getting stronger, angrier, but the alpha won’t even look his way. Eventually practice ends. As everyone begins to clean up, Shouyou stands and tests his ankle again, relieved to find there’s barely any pain with his full weight on it. He starts for the door but stops short as an overwhelming scent - spice, smoke, and ozone - burn in his nose. Kageyama is storming over, furious, releasing waves of aggressive scent and Shouyou freezes, heart pounding. Kageyama stops right in front of Shouyou, eyes blazing as he yells, “Hinata you fucking idiot! What were you thinking?!” Shouyou stands frozen, body locked tense as he denies his instincts, screaming at him to submit. To drop on the ground and bare his neck, release an enticing submission scent to appease the angry alpha. The worst part is, Kageyama is right. Shouyou knows he’s right. He was being reckless, practicing so close to his heat. He could have easily gotten seriously hurt, just for an extra hour of practice. The guilt roils in his stomach and he squeezes his thighs as a trickle of pee escapes him, then another, as Kageyama continues to yell. Kageyama is completely unaware of the effect his threatening stance has on Hinata and he steps closer “Why were you so distracted?! What if you had really gotten injured?! We can’t win nationals without you! We need you!” At those words Shouyou can’t hold it anymore, can’t fight his instincts and collapses as his knees buckle, his head lolls to the side to bare his neck, lips parted, eyes glazed, and a rapidly spreading puddle forms beneath him. Everyone freezes as the scent of a complete omega submission fills the room. Kageyama stands shock-still, anger completely dissipated as he stares in wonder at Shouyou. Shouyou quietly whines, lost in the bliss of submission, lidded eyes locked onto Kageyama’s face. Nobody moves for a few moments. Then Takeda sensei quietly kneels by Hinata’s side and gently places a hand on his shoulder, releasing waves of soothing omega scent. He signals to Tanaka to end practice, Ukai already heading out to fetch the janitor. Takeda murmurs into Hinata’s ear and gently guides a dazed Hinata out the door, waving Kageyama to follow. Kageyama tries not to stare at the way Hinata’s wet shorts cling to his frame, or the liquid shining between his thighs. They head to the lockers where Takeda-sensei leans an unresisting Hinata onto Kageyama’s shoulder. Takeda looks a bit awkward at first, but puts on a stern face as he speaks. “Kageyama-kun, you took sex-ed right?” “Y-yes, Sensei,” Kageyama replies, still too shocked to do anything but answer. “Then I trust you understand enough about omega submission to know that this really means something.” “...Yes, Sensei.” “Alright. I want you to help Hinata-kun shower and get changed. He’ll probably be too dazed to really function for at least half an hour, but he’ll respond to gentle commands from you. You’ll probably need to walk him home or take him to yours and stay with him for a while until he’s back to himself. He won’t be very aware of his surroundings so make sure to be careful and keep an eye on him.” “Yes, Sensei.” “He gave his trust to you, don’t let him down. And Kageyama-kun? I want you two to talk today. Don’t let it get awkward by avoiding your feelings. Don’t let Hinata-kun do it either. Talk, communicate. If you ever need advice about these things, I will always be here, but my first order of advice will always be to communicate.” “Yes, Sensei,” Kageyama’s mind is swirling with what just happened. Hinata submitted, to him . He just can’t wrap his head around it. Omega submissions are rare, and even rarer are complete submissions. It takes absolute trust, respect, and desire. Kageyama never imagined Hinata had felt any of those things for him, and certainly not to this degree. Sensei’s voice pulls Kageyama from his thoughts, “I’ll leave you to it, but please, don’t forget what I said. You two are amazing together, don’t lose that because you are too afraid of your own feelings.” And then he’s gone, and it’s just Kageyama and Hinata. Kageyama quickly and respectfully strips Hinata down and leads him into the shower. He helps him rinse off with uncharacteristically quiet commands and gentle touches. ***** Chapter 2 ***** Chapter Notes Surprise!! New chapter!! Notes about it at the end Unbeta'd and also barely revised (soz) so please do point out any mistakes or typos. Thank you for reading and I hope you enjoy! See the end of the chapter for more notes By the time they finish, Hinata has come a bit back into himself, but still can only manage Kageyama’s name. Kageyama finds Hinata’s bag and hands him his clothes, only needing to lend a hand when Hinata’s arm gets caught in his shirt and he whines, “Kageyaamaaaa..” Kageyama absently helps Hinata’s arm through and wonders where the rest of the team is, figuring they are probably hanging back until he can get Hinata out of there. That’s for the best, because now that Kageyama has gotten over his shock, his protective alpha instincts are kicking in. He’s not sure he can control himself if another alpha were to get too close to Hinata right now. He doesn’t even like the fact that they are still at school. They should be in the safety of his own home, his own room, surrounded by his smell. Hinata should be wrapped up in his blankets and pillows, purring in content. Hinata could reach out for Kageyama, inviting him to nest, and Kageyama would easily let himself be pulled in. Would wrap himself around Hinata’s small, lithe frame, inhaling his sweet, sweet scent. They would kiss and cuddle, Kageyama would sneak his hands under Hinata’s shirt, feeling the smooth skin…. Stop fantasizing idiot , Kageyama shakes himself out of his head. He needs to focus. Hinata trusts him… Hinata likes him. Kageyama can’t let himself get distracted while Hinata left his body in Kageyama’s hands. And first, they need to get home. Luckily Kageyama lives just a 15 minute walk from the school through residential areas. They shouldn’t meet many people on the way. But still, just in case, Kageyama releases a cloud of scent and rubs his jacket on his scent glands before guiding Hinata into it. The jacket engulfs Hinata, it hangs down nearly to his knees and the sleeves hang far past his hands. However, Hinata seems right at home as Kageyama zips him up in it, holding the neckline up to his face and breathing in deeply, a contented purr quietly rumbling in his throat. Kageyama feels a flood of satisfaction at making Hinata purr with his scent and clothes. Now comes the difficult part. Kageyama stares down at the heap of Hinata’s soaked clothes and gulps. The image of Hinata, on his knees, neck bared, the delicious smell of omegan submission suddenly comes back to Kageyama and he can’t help but remember those glistening drops running down Hinata’s legs. His boxers start to feel a bit tight but he forcefully pushes those thoughts away, rinsing off the dirty clothes and shoving them into his bag, he’ll clean it out later. But as much as Kageyama tries to stay on task, he can’t stop all of the confused thoughts swirling around his head. Kageyama has been called dense before, he knows he doesn’t understand what some people see as obvious, and he doesn’t really think about a lot of things that everyone else seems to think about. So he’s not surprised he didn’t realize Hinata thought about him as an alpha, and even as a potential mate. He is , however, surprised that Hinata likes him . Kageyama’s never really thought of Hinata romantically, he’s never thought of anyone romantically. But he thinks maybe, if he’s going to have a mate, maybe Hinata is exactly the type of person he’d want to be around his whole life. He’s cute and strong and he challenges and encourages Kageyama to be his very best. And he also smells really, really good. Like citrus and vanilla- Kageyama secretly can’t get enough of his scent. They are already partners, and they’ll be together for as long as they are playing volleyball for sure, but what about after that? Kageyama’s never thought about it before. He’s going to continue volleyball as long as he possibly can, maybe even go pro someday. But what about Hinata? Kageyama just assumed they would be together, but what if Hinata doesn’t want to go pro, or even continue playing in college? Or what if he does, but separate from Kageyama? Kageyama realizes he must have been releasing a distressed scent because Hinata whines and leans into him, trying to soothe him with a croon. Kageyama grimaces at himself, what kind of alpha makes a submitted omega feel the need to soothe them ? Sensei was right, they just need to talk about it. But first, Kageyama needs to get Hinata somewhere safe and alone.   ===============================================================================   30 minutes later sees Hinata comfortably dozing in a pile of blankets on Kageyama’s bed. Luckily they hadn’t met anyone on the short walk to Kageyama’s house, aside from a few students milling around campus that steered well clear of a growling Kageyama. Hinata had gained a bit more awareness on the way back, but mostly he just blushed and hid his face in Kageyama’s side. As soon as they had gotten back Hinata dug himself into Kageyama’s sheets and soon fell asleep, snoring lightly. Kageyama’s not surprised, complete submissions are known to be pretty tiring, not to mention Hinata’s soon coming heat. Kageyama likes seeing Hinata happily cuddled up in his bed anyway, and he brushes a bit of Hinata’s soft hair out of his face and continues to let him rest.   ===============================================================================   It’s not long before Hinata wakes up, confused by the unfamiliar ceiling. He sits up, noticing how incredibly relaxed and well rested he feels, and then he remembers. A deep red blush floods his face. He had submitted. To Kageyama! Hinata can’t deny his feelings anymore. He’s always noticed how cool Kageyama is, but just wrote it off as friendly admiration. He’s tall, and his eyes are such a pretty, deep blue. Hinata loves his scent, sharp and alluring. His body is toned and strong-Hinata imagines himself wrapped up in those arms and squeaks. He likes Kageyama, and he wants to be his omega. His instincts certainly recognize Kageyama as his alpha. Hinata thinks back to the way Kageyama held his waist possessively as they walked home, grip tightening anytime someone walked by. The memory almost feels dreamlike, but he knows it was real, the way Kageyama growled every time a passerby got too close. Maybe, if it wasn’t purely fueled by alpha instincts, Kageyama wants to be Hinata’s alpha too. Hinata wriggles in embarrassment, hiding his face in the blanket. That would be nice , he thinks. Hinata jumps when the door opens and Kageyama walks in with a glass of water and some granola bars. As soon as he sees Hinata awake he jolts, then awkwardly sits next to the bed. He sets the water and snacks on the bedside table. “I… brought you water.. And food,” he starts, gruff, avoiding looking at Hinata’s face. His mouth is pulled down into a scowl, and Hinata would be terrified if he didn’t know that was just Kageyama’s awkward face. “Thank you,” Hinata mumbles, suddenly too shy to look up at Kageyama. There is an awkward pause as Kageyama sits tense and Hinata kneads at the blanket. “Kage-” “Hina-” They start at the same time, then another awkward silence arises as they stare at each other. Kageyama’s face turns dark red and Hinata can’t help but let out a giggle. “You first,” Hinata says with a small, shy smile on his face. “Oh, uh. Okay…” Kageyama pauses, an unsure grimace flashes over his face but he eventually forces the words out. “Um, I’m not good at this kind of thing-” Yeah, obviously, dumbass “-so I’ll just ask. Do you wanna be my mate?” Hinata squeaks as blood rushes into his reddening cheeks, yelling “Bakageyama!! Where’s your delicacy?! That’s so embarrassing!” Hinata swings a pillow and hits Kageyama in the face. “Hinata you idiot! Stop hitting me! I told you I’m bad at it! I don’t know what to say! You say something!” Kageyama pulled the pillow from Hinata’s grasp. Hinata huffs and settles down, mumbling, “Sorry… I’m bad at this, too. I mean, isn’t it obvious, though?” “Wh-what do you mean? What’s obvious?” “Us! We’re like, the strongest combo! In volleyball, but also maybe together? I don’t know, I’m not really into the whole dynamic thing, I’ve never even gone on a single date. But I think, since we’re gonna be together for volleyball, we could also be together! ” Hinata’s voice had gradually risen with excitement, but he quiets down and continues, “I mean, if you want to. But um, I’m just saying, I’m not against it. Obviously. I wouldn’t... Submit… to just any alpha. Only you.” Hinata pulls the blanket up to hide his blushing face again. Kageyama can’t help but stare. He’s never felt so protective, or so affectionate towards anyone in his life, and frankly, he doesn’t know how to deal with it. He wants to squeeze Hinata in a tight hug, scenting his soft hair, laying kisses down his neck. And if Hinata’s words are to be trusted, he wants that too. But Kageyama hasn’t forgotten Takeda-sensei’s advice. First, they have to talk. And quickly, if Hinata’s ripening scent is anything to go by. His heat will probably start by tonight, and if he wants to go home, Kageyama doesn’t want him walking around vulnerable. Hinata lets out a choked noise, and Kageyama realizes he’s been silent for too long, with a grimace. Hinata probably thinks he’s trying to turn him down. “Wait, sorry, I was just thinking. But I feel the same way. About you. About us. For the person who will be with me for the rest of my life, who better than my ultimate rival and ultimate partner, right? I think you’re… really cute. And I like the way you smell. I’ve never been interested in being with anyone before, but I’m interested in being with you.” Kageyama looks up at Hinata’s face and is blinded by the wide smile stretching his cheeks. “So does this mean we’re mates now?” Hinata asks, smile still brightening the whole room. “Um, yeah. Can, can I kiss yo-” But before Kageyama can even finish, Hinata is there, squeezing Kageyama’s cheeks with his palms and smashing their lips together. There’s no finesse, no skill, just spit and teeth and raw excitement. Yet Kageyama finds it perfect, he lets his eyes drift shut and reaches for Hinata to kiss back. Chapter End Notes Okay It was super hard getting these stupid dense boys to talk about feelings in an effective way, so apologies if it felt ooc. I do think, though, that in their second year they will have matured at least a LITTLE. There is an astounding lack of omo in this chapter and for that I do apologize. HOWEVER listen next chapter... next chapter. Trust me. It will be the smut we've all been waiting for. Plus omo so get ready. Anyway thank you for reading, and thank you sooooo much for all the kudos, bookmarks, and incredibly sweet comments. It's really helped motivate me to keep going with this fic! End Notes I'm thinking this will end up 3 chapters but honestly who knows. I sure don't. Anyway kudos, comments, and bookmarks give me life and are always very much appreciated! Thank you for reading and I hope you liked it! Please drop_by_the_archive_and_comment to let the author know if you enjoyed their work!