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atsumu was always at least a little aware of kiyoomi's flexibility. however he wasn't fully aware to the extent of just /how/ flexible he truly was - or it's potential. until now that is.
———
they had been dating for not too long when they began to get more intimate. it was maybe a couple months after kiyoomi first joined msby, and then another couple months into seeing each other when they finally couldn't keep their hands to themselves any longer.
it should have been a fairly awkward first time together; but a little liquid courage and heavy foreplay made it one of the best firsts either had ever had.
tipsy and bold, the sex was so good that both of them knew they were probably going to be hooked for life. whether or not they would admit that at this point in their relationship is still up for debate though.
and so, even though they haven't quite yet gotten to the 'i love you' stage of their dating adventure, atsumu very much loves his tall, bendy boyfriend. he loves kiyoomi's silky black hair, his wrists that are so soft and pliable, his thick calves, his particular personality, and his spine almost like a fluid reed at times. all of it constantly consumes atsumu’s attention when they’re together.
it isn't until a good bit into their steady sexual relationship would kiyoomi bring up /how/ he would sometimes pleasure himself when on his own.
atsumu hadn't even considered the potential of his boyfriend's flexibility until one early
saturday conversation.
"oh, yeah. i've sucked myself off before."
kiyoomi didn't look up from stirring milk into his tea, but he could immediately feel atsumu's wide stare burning into the side of his head.
it was so casual atsumu almost couldn’t process what kiyoomi actually said.
"you…”
kiyoomi was now beginning to think he's going to regret his confession. he looks up from his mug and atsumu's eyes are intensely dark, his face and neck completely overcome by a deep flush.
every person who happens to have a dick has tried to, or at the very least thought about it before. this certainly includes atsumu himself, though the attempt left him with a bruised ribcage and even worse off ego. but here now before him was the love of his life in his kitchen casually admitting to have lived one of his ultimate fantasies.
kiyoomi can hear atsumu's breathing pick up and he moves forward to place a hand on the table next to kiyoomi's tea. atsumu’s veins bulge under warm tan skin and muscles tense as he leans down to look closer into his boyfriend's eyes. a pale blush blooms high on kiyoomi's cheeks.
he cranes his neck a little to look up at atsumu. his mind was racing with filthy visions and kiyoomi could see it in his gaze. the breath against kiyoomi's lips is hot and heavy.
“show me. please."
kiyoomi is starting to feel like he might not regret this after all.
———
the bedroom is electric in it’s quiet.
"sit there," kiyoomi gestures vaguely to an upholstered arm chair. it faces towards the side of the bed, placed with intention. kiyoomi looks over to his golden boyfriend and smirks,
"and for a little fun, no touching yourself until i come, hm?"
now he’s just getting off on bossing atsumu around. what a fucking menace.
still, atsumu obediently sits; he’s fully clothed in nice black jeans and a loose plain shirt. nothing fancy is really needed for this. kiyoomi however, strips out of his clothes fairly efficiently; all until his boxer briefs are oh so slowly pulled away from his long legs and atsumu flushes all over again. kiyoomi's cock is as it always is - long and rosy pink - and the situation suddenly feels all too real. this is really happening.
atsumu is looking at his boyfriend with brand new eyes and he can finally visualize how this could be possible. with a cutting side glance from kiyoomi, atsumu is very quickly becoming /very/ hard in his pants. kiyoomi flushes and looks away. god his man is pretty.
kiyoomi kneels onto the bed and shuffles forward until he's up close and facing the headboard. he lays backwards and pulls his legs up above his chest, with his hands against the back of his thighs keeping him up.
awkwardly scooting forward a little using his strong arm and back muscles, kiyoomi settles on his upper back, shoulder blades cutting into the bed. the back of his hips come to rest against the cool, flat headboard and his pretty cock head is kissing the skin of his stomach just above the navel.
his strong, muscular torso now looks delicate and soft as it folds into itself, layers of flesh and fat giving way to lower his hips closer to his face. a push of his hips forward and his cock bobs above his face, a breath away from his lips and usually where most flexible people would have already reached their limit. but atsumu's beautiful, bendable boyfriend takes a deep breath in... then out...
relaxing his muscles further and he uses his stupid, sexy flexible hands to put more pressure against the back of his thighs. atsumu holds his breath as he watches, knuckles turning white against his thighs. the dewy tip kisses his bottom lip, then pulls away just a hair. precum keeps him connected to himself by a thread, but it is broken when kiyoomi pulls his cock back down to his mouth again.
his soft, wet lips engulf the tip, licking against himself with short pets of his tongue. atsumu can't hold back his raspy breath,
"fuck, omi."
his dick is so hard it starts to feel good pressed up into his pants.
it's only a little, no more than two or three inches into his mouth, but it's more than enough to get kiyoomi worked up. a bright blush pinkens his cheeks and chest as he takes a deep breath of his own musky scent.
kiyoomi lets out a short whine, muffled by his own cock on his tongue. it's as if he is slowly drowning himself into submission. taking away one hand from his thighs, kiyoomi slowly strokes the rest of the shaft of his cock, giving desperately needed stimulation to what he can't pull into his mouth.
atsumu echos his groans. neither of them really know how he's managed to stay seated in the chair as long as he has. kiyoomi drags his hand lower on himself to massage and softly pull his balls as he continues to suckle himself into his warm mouth. his skin tastes clean, he notes - if not a little bitter and salty.
atsumu feels like he hasn't taken a breath in hours, eyes unable to move from kiyoomi's body, his lips, the shiny head of his cock against his own tongue. kiyoomi's hips give a sudden jolt, pushing himself another inch into his mouth and his whine makes atsumu leak a little bit into his boxers.
"fuck omi yer so hot."
atsumu's rough voice makes lightning crackle up kiyoomi's spine and his own whimpers gently vibrate against his skin, only helping to further push himself towards orgasm. his mouth feels so, so soft around his own cock. the room is hot and thick, getting off like this is so different when there is someone else watching him. all of his senses feel heightened, almost painful. but it feels all too good to stop.
his hips jolt again and the muscles in his abs tighten. he can feel it coming already. kiyoomi releases himself from his mouth with a small whine, bringing his hand back around his cock to quickly stroke himself right up to the edge.
his thighs are twitching, hips bucking down into his hand as atsumu watches sweat run down his temples to his dark curls. between pants and moans, atsumu can hear sighs of his name from kiyoomi's messy mouth. "fuck- atsu, atsu astuatsu-" his belly tightens, abdomen rippling, balls drawing tight. cum beads up from the slit and finally spills over to drip down into his waiting mouth. a ragged moan is ripped from his lungs and savory, lucid cream pools onto his pink tongue as the muscle hangs limply from his parted lips.
heavy, wet breaths and hips that just wont stop fucking into his hand make his aim falter a little. some of it catches on his chin, slowly dripping down his neck to his collarbones. a small burst goes too far and splatters thick threads high onto his flushed cheeks.
as his high wanes, kiyoomi's mouth is thoroughly covered in the evidence of an amazing orgasm. he lays in his afterglow prettily, displayed like a wrecked painting of lust. atsumu can't fucking take it. his hard cock cuts against the seam of his jeans too deliciously.
as kiyoomi spills onto himself, atsumu gives in and presses his rough, burning hand over his hard on. with a few firm strokes against himself, he's spilling an embarrassing amount of cum into his underwear.
he lets out a deep groan that kiyoomi responds to with his own whines. atsumu's body is flushed warm from his belly to his face. his release seeps through his pants. a deep warm smudge, fully visible and shameless in his lap if kiyoomi were to look up for a second.
but kiyoomi is a little too preoccupied making a mess of himself to notice. as the last threads of cum drip from his slit, kiyoomi brings his tip back into his mouth, sucking the last of his release down his wet throat with consecutive, little swallows.
he doesn't move his lips away from his burning red cock for a while, continuing to lick and tease his tip, whimpering and gasping well past overstimulation. atsumu can't believe he is lucky enough to witness his boyfriend milking himself of every drop like a dying man. he could probably die happy right about now. finally, kiyoomi lets go of himself with a sharp whiny inhale that devolves into breathy moans as he lets himself fill his lungs with the cool air of the bedroom. they both don't move from where they sit for a while, just trying to catch their breath enough to see straight again.
atsumu moves from his seat for the first time since he was ordered into it. he crawls forward onto the duvet and leans down, breath tickling the curls lying against kiyoomi's forehead. looking back up at him, albeit upside down and his lower back still against the headboard, kiyoomi suddenly feels a rush of embarrassment that twists his gut.
atsumu either pretends not to notice or truly doesn't care, and leans in to press wet kisses to kiyoomi's mouth, tasting him from his own lips. his tongue is ravenous, licking deeply into kiyoomi until he just might pass out from a lack of air.
when atsumu releases him, kiyoomi is a little cross eyed as he tries to focus his vision on atsumu's face. they both just breathe in each other for a moment. "fuck yer so pretty." "god, i love you"
the heavy, warm air between them is silent for a beat.
"huh?!?!?"
"if you missed it the first time you're out of luck, i'm not going to say it again.
"nuh uh! no way did ya just beat me to the first 'i love you'!"
"do you have to turn everything into a competition???"
"with you babe? always.”
"and i really love you too."
"mm, good."
"now, teach me how to do that too!"
"never."