Chapter Text
The room is dark with the moon on the night sky being the only source of light. The breeze is cold and subtle as it caresses their warm skin. The night is quiet as they let out hushed whispers, hushed moans and whimpers, one hand covering their mouths as they breathe out and breathe in the pleasure.
Atsumu’s dazed eyes meet the other’s piercing dark orbs that reflect his golden hair shining under the witness of the moon. Atsumu uses his hand on the other’s length, flicking his wrist with a pump of his hands, causing Kiyoomi to grunt and close his eyes due to the sudden pleasure.
Settled behind the wall, hiding in the room’s blind spot, they are currently in an empty classroom where the rest of the volleyball club members are sleeping just down the hall. They try to muffle any sounds as much as possible, focusing on each other’s warmth.
It was risky, thrilling, it was quiet yet their hearts beat loudly in their chest. It’s a cold and empty classroom but, all Atsumu feels is Kiyoomi’s warm hands all over him and his warm breath ghosting over him.
The blonde closes his eyes as he feels the other’s rough hands on him. This arrangement, this exchange, all of this seemed surreal to him. It was like out of a fantasy, something out of his wildest dreams. With the way Kiyoomi is here, doing this with him right now, touching him and caressing his skin… all Atsumu could do was melt into him .
A gust of cold wind breezes through as Kiyoomi uses his other free hand to make their way up to the blonde’s chest, his fingers nimbly playing with those upturned buds. Atsumu feels himself shiver as he feels every tentative flick and touch. Another breeze passes through, carrying the scent of spiced vanilla with the scent of mint and dark chocolate loosely intertwined with one another.
Kiyoomi moves his face to the back of Atsumu’s neck, breathing in more of the omega’s scent that’s leaking out behind the scent patch. He presses his face closer, deeper into his nape, close enough that he can almost smell the scent of spiced vanilla directly through the scent patch.
Atsumu feels Kiyoomi’s lips lightly graze against his skin, it’s so soft and light that it's almost tantalizing . He wants him to press harder, deeper until it leaves a mark. A mark, oh , just the thought of that has Atsumu dizzy. He badly wants Kiyoomi to just scrape his skin with teeth, wants him to bite, suck and claim him.
But, no matter how much he yearns the feeling of his teeth on him, he knows that Kiyoomi is someone that wouldn’t cross the line of no return. Atsumu tilts his head as the alpha press butterfly kisses onto his nape, making him quiver to his touches. Those soft touches and kisses do nothing but fuel his desires even more but he reels them in, controlling himself.
Atsumu’s toes curl as he feels the familiar heat pooling in his stomach. Kiyoomi notices his reactions, his hands moving faster in response as he brings them closer to the edge. He flicks his wrist just right, pumps his hands in a quick pace until Atsumu comes with a moan muffled by his own hand. Kiyoomi comes soon right after him with a low moan.
The blonde blinks his eyes open as he comes down from the high. He looks at Kiyoomi who’s catching his breath with his head rolled back, he looks at the bead of sweat rolling down from his temple down to his neck.
Atsumu blinks his eyes again, trying to take his attention off of the alpha. Instead he looks at the moon peeking through the open window of the classroom, the sole witness of their midnight rendezvous.
---
“Nice toss, Tsumu!” Ginjima exclaims, approaching him with a high-five. The wing spiker just scored the team a point with a back attack, earning them the winning point in their second practice match of the day against Itachiyama.
Atsumu gives him his signature grin, raising his hands for the high-five. “No less from me, of course.” He smugly replies, turning to smirk at Kiyoomi from the opposite side of the court.
The spiker gives him his signature glare and scowl, making Atsumu laugh at the predictability of his reactions. From the other side of the net, he hears Motoya utter a loud apology, saying how he should have gotten that ball. Then quickly turns to his cousin to tell him to stop glaring.
Kiyoomi does indeed listen and stops his glaring but his eyebrows remain furrowed. Much to Atsumu’s amusement.
It’s always kind of hard to believe Kiyoomi’s duality, that this Kiyoomi is the same as the Kiyoomi from last night .
Atsumu walks towards their manager who wordlessly hands him his bottle containing sports drinks. He gulps down the drink as he thinks about how Kiyoomi always seems to be furrowing his eyebrows, it’s just that… During the day, they are furrowed in annoyance, always scowling like everyone and everything has offended him.
But, last night , Atsumu remembers seeing those eyebrows being furrowed because of something else entirely.
He remembers seeing those rumpled eyebrows with an accompanying flush on his cheeks. He remembers those eyebrows contorting into pleasure as he lets out soft groans.
He remembers those tense eyebrows relaxing after he reaches his peak, slack as he catches his breath. Atsumu smirks as he remembers how he is able to make those eyebrows furrow for two entirely different reasons.
He finishes the half-empty drink with ease but it seemingly didn’t help him much as he still feels a never-satiable thirst residing in him. He licks his lip then grabs his towel to wipe off his sweat.
He feels eyes on him and knowing whose eyes are on him, he gives a little wink which earns him another signature scowl from none other than Kiyoomi.
The omega couldn’t resist letting out a loud cackle at the ever-so-predictable reaction from the alpha, making his teammates and some of the Itachiyama members nearby look at him.
“Has he finally lost it?” Osamu says with a teasing voice, his lips pulled into a snarky grin. Rintarou, who’s sitting beside him, laughs at his words. “Nah, he’s just flirting with Sakusa.” Comes his haughty reply, taking a sip of his sports drink afterwards.
Atsumu turns his attention to his teasing teammates with a glare. “What flirtin’? I’m clearly pickin’ a fight, see? He looks pissed off already.” He says with a lighthearted chuckle. Rintarou rolls his eyes at his words. “Sakusa always looks like that, be for real, dude.” He replies as he puts down his bottle.
Osamu agrees with a quiet laugh, also putting down his bottle. “I mean, to be fair, fightin’ and flirtin’ is practically the same thing for both of them.” He adds with a shrug.
The members of Inarizaki all laugh at his words, some even nodding in agreement while their coach, Kurosu-sensei, just shakes his head with a small tired yet lighthearted sigh at the rowdy bunch.
Atsumu juts out his lips in a small pout, crossing his arms over his chest. “I can’t believe it, y’all are bullying a sweet ‘n cute omega.” He says in a fake, high pitched voice while batting his eyelashes, trying to act cute and innocent.
“There’s that line! I knew that he would say that.” Ginjima says immediately as if he was waiting for the moment Atsumu spouts those words. “Yer so predictable, Tsumu.” The spiker adds, nudging the aforementioned slightly by the shoulders.
“Damn, y’all are getting used to my tricks. Gotta come up with somethin’ new now.” Atsumu replies with an exaggerated sigh, he then proceeds to do a thinking pose. He brings his index finger to his chin, looks up and shuts his eyes close as if thinking really, really hard.
“Hmmm…” He mumbles as he racks his brain for some ideas. “Careful, Tsumu, ya might break your brain if you use it too hard.” Osamu jokes as he stands up to ruffle his twin’s hair.
Atsumu immediately swats his hands away. “Dude! Not the hair, oh my god.” He grumbles as he attempts to fix his hair that now resembles a bird’s nest as best as he could. Rintarou and Ginjima’s laughter echoes throughout the gym with Osamu’s laugh following soon after.
Kurosu-sensei clears his throat, effectively quieting the ruckus down. “Okay, enough with chatting. Get ready for your next match with Mujinazaka.” He announces to which the team quickly replies with a loud chorus of “Yes, coach!”
Soon after, they get into position. A few minutes later, the sound of the whistle echoes in the gym and the practice match begins.
---
Just like how most things started in Atsumu’s life, this whole thing with Kiyoomi all started because of Atsumu’s stupidness and, quite frankly, his annoying pride. He couldn’t even call it an honest mistake because of how stupid the reason is.
In fact, Kiyoomi definitely deserves some sort of medal for even putting up with any of Atsumu’s bullshit.
You see, our dearest Atsumu here is what you call a late bloomer or more precisely, he’s one of those rare cases where during puberty, his tests showed him as a beta.
Despite being twins, Osamu’s tests had resulted in him being an alpha. Atsumu being Atsumu was hella pissed off with these results, he thought that him being a beta didn’t seem right and that it was a mistake.
And surprise, surprise, he was actually most definitely right.
When his peers started developing and differentiating, Atsumu was kind of glad to not be subjected to any of those changes. He knows firsthand how bad it was, with him seeing it up close on Osamu. Though that doesn’t change his thoughts about how him being a beta didn’t make any damn sense.
So, during his second year of high school, Atsumu suddenly started experiencing weird symptoms that made him utterly confused. He was at an age where most people have already finished or are about to finish with their differentiating.
Not to mention that betas didn’t need to go through any changes.
He started having changes in his body that absolutely did not make any sense. It started with a light scent of something sweet wafting off him that other people have noticed, then, it was how he constantly felt warm, too warm for it to be normal but not warm enough for it to be a fever.
At first, these changes were ignored, swept to the back of his mind, he really didn’t think much of it. It wasn’t until he had a ridiculously high fever and immense body aches that he was now aware that something was definitely wrong.
Osamu had entered his room to wake him up but the alpha had immediately covered his nose as the scent of spiced vanilla violently infiltrated his senses. His twin brother then quickly called out for their mother to which they quickly rushed him to hospital.
It wasn’t a pleasant experience to say the least. Atsumu was in pain and had to do a bunch of tests. Tests that had answered the reasons for why those symptoms had appeared so suddenly.
He had differentiated into an omega .
There was something humorous about how he had been actually right about him being actually not a beta, although he had meant that he was also an alpha like Osamu. But, the universe clearly works in mysterious ways that may or may not be out to ridicule Miya Atsumu’s life.
Anyway, the doctor explains carefully about his condition and how his pheromones are currently unstable and that he needed to take extra care of his body. Thankfully nothing life-threatening nor would it be a great hindrance when it comes to volleyball. It would just take some adjusting from being a beta to an omega.
And that’s where the problem lies. Atsumu is a liar, a coward and a prideful bastard. He does not know how to properly take care of his omegan urges.
He does not know a damn thing about being an omega except that there’s heat, he needs to wear scent patches and that being an omega isn’t something easy. Despite him not knowing how to actually handle his heats, he lies through his teeth. Why? Because he would rather die than ask anyone about all that embarassing stuff.
And unfortunately for Atsumu, his heats are irregular because of his late differentiation.
He can’t use the normal dosage of suppressants because his body is still developing which makes it that handling his irregular two-day semi-heats that occur randomly are a pain in the ass, literally sometimes. Jerking off normally doesn’t do much for him and he usually would be too tired and in pain to move his hands but also too horny to sleep it off.
It was frustrating and especially being surrounded by a majority of alpha teammates with different smelling pheromones, it was really difficult for him.
He and Rintarou are currently the only omega starting players in their team and sure, you’re probably thinking, “Why not talk to Rin about the omega stuff?” Sure, if only Rintarou wasn’t literally one of his brother-in-laws. Well, technically, he and Osamu aren’t engaged and definitely not yet mated, (apparently, they’re too young and there’s also the complexity with Motoyai now added in their relationship) he still thinks that it’s awkward to ask Rintarou about those things.
So, how does one Sakusa Kiyoomi manage to find himself stuck in some sort of erotic fantasy with Atsumu?
It’s simple. Atsumu had underestimated his irregular heat and stubbornly used too much of the supposed dosage of his suppressants just so he could join the yearly summer camp that they hold in Inarizaki High where Itachiyama alongside Mujinazaka and other strong teams have traveled and joined their summer camp.
At first, Atsumu felt fine, energetic even, I mean, how could he honestly not be when he gets to play against these strong teams. And he especially is energetic when he can see a certain grumpy face that brings nothing but joy to him. But, then he quickly doubles down. His stamina is clearly not to be joked about but, jumping and running for hours in a room full of alphas definitely took a huge toll on his already weakened state.
He somehow managed to last through the day but, he was definitely not the least bit okay. He could feel his heat worsening and the suppressants were starting to lose their effects. He decided to rest inside an empty classroom a little bit farther from where the rest of the club members were staying.
He had decided to foolishly try to help himself by, I don’t know , rubbing one or two out. But despite his best efforts, it wasn’t really helping him.
He was tired, in pain and very, very horny. It was almost annoying him. And that’s when our other main character, Sakusa Kiyoomi, comes into play.
“Miya?”
The aforementioned jolts in surprise at the sudden voice. Atsumu looks up to see Kiyoomi standing by the classroom door.
Fuck, he had forgotten to lock or even close the door when he went in. How fucking stupid of him.
He scrambles to… fix himself. He tries his best into making himself presentable, pulling up his underwear and pants then, covering his ahem boner ahem with his jersey jacket.
He awkwardly laughs, looking at the alpha as he hopes that the slight panic in his eyes isn't obvious. “Haha, Omi… What’s up?” He tries to take charge of the topic of the conversation before Kiyoomi could ask him about literally anything.
“You’re in heat, Miya.” Is what the spiker says instead, totally not getting swayed by Atsumu’s best attempts. This is the part where Atsumu should admit that he is indeed having some trouble but, would he still be Atsumu if he actually did that?
“Pfft, whaaaaat? No, I’m nooooot. What are ya talkin’ about, Omi-omi? Hahahaha…” Is what he responds instead. Totally stupid, am I right?
“Do you think I’m stupid or what? I can literally smell you.” Kiyoomi deadpans, still standing by the door, not entering the room. “Wow, okay. Sorry if I smell, I haven’t washed up yet, you see.” Atsumu replies, rolling his eyes.
The other looks at him in confusion “What? I meant your pheromones. Anyway, shouldn’t you go home? I’ll go call your brothe—” Atsumu hurriedly interrupts him. “No, don’t!” The alpha stops in his tracks. “Why?” He asks, confusedly. “Just… don’t, okay?” The blonde pleads. Kiyoomi looks at him for a straight minute before nodding. “Okay,” He answers. Atsumu’s face brightens, he grins at him. “Thanks, Omi—”
“I’ll go call Suna instead.” Kiyoomi adds, getting ready to go to the room where the rest of the Inarizaki members are staying. “No, don’t! Don’t call anyone, please, please! Omi, please!” Atsumu pleads, getting ready to chase Kiyoomi down the hall. “Why? You’re clearly in heat and need help.” Atsumu lowers his head in defeat. The taller lets out a sigh. “You better have a good reason for this.” He adds.
Atsumu looks up at him with an apologetic smile and then sighs when Kiyoomi doesn’t budge.
“....”
“....”
“Fine, It’s cuz I’membarrassedanddon’twanttoaskanyoneforhelp.” He says quickly, compressing his words as much as possible. He looks at the alpha with a sheepish look, clutching the jacket that’s currently covering his raging boner for support.
“...”
“Say that one more time, properly this time or I’ll go call your brother and Suna whether you like it or not.” Kiyoomi ( threatens) tells him with a straight face. And this time, Atsumu was quick to admit defeat, he knew better than to test Mr. Grumpy’s limits. “Fucking hell, okay.” He curses out loud.
“I’m embarrassed and don’t want to ask anyone for help.” He explains in a quiet voice, head lowering every horrific word that comes out of his mouth.
Kiyoomi is quiet, not a single word or sound comes out of his mouth. Atsumu would have thought that he had left if not for the faint minty scent that lingers in the air. A second passes by. Then, ten, twenty and it’s a full minute.
Kiyoomi moves a little, he opens his mouth. “Then,” He clears his throat.
“Will you let me help?”
?
Pause.
Atsumu is starting to think that his heat has made him start getting delusional. He did not just hear THE Sakusa Kiyoomi offer him, Miya Atsumu, help.
Like, I mean, he really is hearing things, right?
Right…?
Kiyoomi sighs. “You’re not hearing things, I can help you.”
??
He says, answering a plethora of Atsumu’s thoughts. He ignores the fact that it’s like the other can hear his thoughts. No way, there’s no way that he means that. Like, why would Kiyoomi want to help him? That’s just plain stupid and impossible and false and—
“It’s not a lie, and I don’t mind helping you.”
???
“…”
“…”
“…Huh, hard to believe but, okay, sure, bring it on! But, anyway, help me, ya say? How?” Atsumu asks, finally somewhat convinced that Kiyoomi actually wants to help him.
Kiyoomi, after a few minutes of standing outside the classroom, finally enters the room. He closes the door before pausing. “Do you want me to lock it?” He asks, looking back at Atsumu.
“Lock it, duh,” The omega responds, clearly not realizing that he’s gonna be alone in a room with an alpha. (Or maybe he actually does trust Kiyoomi, not that he will ever say that out loud though.)
A click sound of the door locking is heard before Kiyoomi starts walking towards Atsumu. “So, I’m assuming that you don’t know how to handle your heats properly.” The alpha says as he takes a seat beside the blonde who nods at his words. “Then, let me explain it to you.”
He clears his throat. “Usually, heats and ruts alike are handled by satisfying sexual urges, either it’s by yourself or with a partner. In most cases, the partners would be omegas and alphas, with the occasional beta partner in some cases. The reasons for why an omega and an alpha tend to be the common partners is because of pheromones.” Kiyoomi explains carefully, Atsumu nodding in understanding.
“You already know this but, alphas and omegas are the only ones that have pheromones and the ability to smell them and be affected by them. Which brings me to another way of handling heats: It’s by scenting your partner with pheromones to help alleviate the pain and help them calm down.” He explains further, looking at the omega’s face to make sure that he understands fully.
Kiyoomi sits a bit closer to him. “So, I will be helping you by scenting you with my pheromones. Is that okay?” He asks Atsumu, looking him straight in the eyes.
“You will end up smelling like me for a bit but, since it’s external, it will be gone in a few hours and it’s easy to cover up. But, this solution is temporary. It will work for tonight and may only last you… at most, a day until the effect disappears and your heat symptoms will start to show again.”
“Then, can’t you just scent me again when the effect is gone?” Atsumu asks in a matter-of-factly way which makes Kiyoomi a little bit speechless with how he doesn’t even know how brazen his words are. But, nonetheless he nods. “Yes, I can.”
The omega beams at him. “Then, what are ya waitin’ for? Do it, Omi-kun, hurry!” Atsumu excitedly exclaims, eagerly waiting for Kiyoomi to do his magic.
And long story short, that was the day Kiyoomi had started helping Atsumu out.
Because of the irregularity of his heats, it happened more often than he had anticipated. During joint practices, training camps and even on breaks and free time during competitions. Atsumu often uses mint scented patches to cover up the fact that the minty chocolate scent on him is in fact Kiyoomi’s pheromones.
This arrangement has carried on for months until now they are in their third year.
The whole helping out thing had started as innocent scenting, then, it started to include a little bit of touching.
At first, it was accidental, their thighs just brushing against each other, then they started moving closer and closer each time until they were already embracing each other with the lame excuse of “It’s easier to scent this way.”
Then those innocent hugs and caresses were no longer truly innocent. It started with a little teasing, a little challenge, rocking against each other until little by little, zippers were unzipped, shirts were thrown off down on the floor and hands were roaming and exploring their bodies.
It was all for the sake of helping each other out but, is it really?
Even on days when Atsumu doesn’t need help, they still find themselves drawn to each other. Rough hands on the other’s waist as he pulls him closer, warm breathing ghosting over the others as they move their hands lower, lower and lower.
There was definitely a change in this… what do you even call this? And it was obvious that the arrangement has lost its primary meaning but, does any of them voice that out? No. Do they do anything about it? Of course not. They just continue without asking questions, without saying anything unnecessary like an unspoken rule.
---
It’s eight at night on a Thursday when Atsumu comes out of his room to find something to snack on. He walks past Osamu who’s having a video call with his boyfriends while chilling in the living room.
He goes through their fridge and finds absolutely nothing that he feels like eating despite the fridge being full to the brim. He closes it and goes through the shelves in their pantry and manages to find a small bag of chips.
He grabs it and immediately rips it open before plopping down on the couch next to Osamu. Atsumu then shoves himself in between his twin and his phone, grinning at the screen with a wave. “Hey Rin, Hey Toya!” He greets the two people with a big smile.
The two mentioned quickly greet him back, with Rintarou rolling his eyes at him and Motoya, this sweet, sweet Motoya just simply waves at him with a smile. Totally unlike that so-called best friend of his. Hmph .
Osamu shoves him away with an annoyed grunt, making Atsumu laugh menacingly at him. The blonde settles himself comfortably next to his brother, taking his phone out as he munches on his little snack.
The three of them continue their prior conversation that the blonde omega had graciously interrupted while occasionally adding Atsumu to the conversation. It was fun and casual until Motoya suddenly mentions something that makes Atsumu pause.
“Oh yeah, this week has been so hectic. So many people are going through me trying to talk to Kiyo, apparently, they are thinking of confessing to him because he’s a third year now and that it’s their last chance.” The omega sighs.
“Like, yesterday, his locker was full of letters and gifts, I thought it was Valentine's day for a second there.” Motoya adds with a laugh. Rintarou chuckles. “Why is Sakusa so popular anyway? He always looks like everyone and their mothers have offended him.” He jokes, earning a laugh from both of his partners.
Motoya lets out a low hum. “Well, believe it or not but, people like that. They think it’s cool or something, it’s honestly so…” He sighs. “I don’t care if they want to confess to him but, don’t bring me in the mess? And my dearest cousin uses this to his advantage and makes me handle it for him.” Osamu lets out a small chuckle.
“You’re like his manager or something.” He says with a laugh.
“Right, Tsumu?” Osamu asks, turning to his side where he sees Atsumu who’s quite literally frozen in place.
“Tsumu? Ya alright?” His twin asks him, confused and concerned as to why he suddenly was quiet. He nudges him slightly. “Hey, Tsum?” And that had managed to snap the blonde out of his trance. “Huh? Uh, yeah, I’m okay, just, getting sleepy. I’ll go to my room now.” Atsumu says quickly, rising from the sofa then to his room.
“So many people are going through me trying to talk to Kiyo, apparently, they are thinking of confessing to him because he’s a third year now and that it’s their last chance.”
” …thinking of confessing to him.”
" last chance.”
Atsumu’s mind is filled with countless questions.
Is Kiyoomi going to accept anyone’s confession? Will he start dating someone? Will he be with another omega?
If so, what will happen to their arrangement? What will happen to me? What will I do when he finds someone that isn’t me?
No, I can’t let that happen.
Atsumu grabs his phone, opens his contacts, presses on the call button. The phone rings two times before the other line picks up and answers.
“Atsu? What is it?”
“I’m coming to Tokyo,”