Work Text:
It's dark outside, the windows open to let some air in. Sieun has an exam tomorrow but even though they're already in college Sieun's study habits are still as bad as his eating habits. So, Suho being the wonderful, most awesome hyung, accompanies Sieun whenever he can.
Tonight is one of those nights, Suho doesn't know about the all nighter Sieun pulled yesterday and the pitiful two hours of sleep he forced himself into just to function tonight as well.
Suho, meanwhile, has slept through all his classes and lunch break today. As a result, he is lying wide awake on Sieun's bed, playing some game Sieun neither understands nor cares about. At least he is quiet while playing except for the occational cheers whenever he wins a match.
The graphite rubs against the paper where Sieun notes down all the muscles of the human body with their locations and functions written beside them. His handwriting is not as neat as he'd like but that's what he gets for not sleeping. Well, that and the annoying thuds of pain settling over his eyebrows.
His grip on the pencil tightens but he keeps writing. The soft scratches are the only sounds aside from his own steady breathing. His eyes flick towards Suho when he cheers suddenly, his voice is clear and loud in the silence. His fist punching the air in triumph as he sits up against the wall. Sieun's eyes skim over his form, taking his time with his staring, going from his hand to his elbow and stopping at the sleeve of his red shirt that curves over his broad shoulders.
He blinks and turns back to his book, a light pink dusting his cheeks. He flips the page to a new one and continues writing. He studies the diagrams and memorizes the names, trying hard not to think about the boy sitting only a few feet away.
***
One second Suho is tapping rapidly at the attack buttons and the next second he is met with his own reflection on the dark screen as his phone runs out of battery. A frustrated sigh later, he plugs his phone to the charger. Having nothing to do anymore, his eyes land on Sieun, body slumped over his desk as his pencil moves lazily over the paper. He looks really tired...
Suho stares for a few seconds and nods to himself before leaving the room to make some coffee for Sieun.
He is standing beside his chair and looking over at the notes Sieun's been writing for the past few hours, the several diagrams and the complicated names make his head spin.
Sieun, with his head aching and mind kinda fuzzy from the lack of sleep, looks up at the soft clink of the cup Suho sets beside him.
Suho smiles and runs a hand through Sieun's hair, "Take a break, come on." Slowly pulls him off the chair and drags him to the bed. Hands him his coffee, pets his head and Sieun lets him because he's too tired to push him away and also maybe he likes the soft way Suho touches him.
Suho's grin widens when Sieun's head leans into his palm and his eyes close behind his cup as he takes small sips of the hot beverage. They're both quiet, the seconds fly by like that until they turn to minutes and when Sieun's cup is empty, he stands up sluggishly, making Suho's hand fall back.
He is about to place his cup down when a sudden thought takes over his mind. He turns, nudges the cup into Suho's cheek and stares as it gets smushed, looking fuller, cuter, making his lips even more pouty.
Suho is a bit confused by this but doesn't say anything when Sieun sits back down beside him, Suho's face now between two cold palms that squish his cheeks. It makes him look adorable.
Sieun's staring is not unwelcome but this whole situation is kinda freaking him out so Suho grabs at Sieun's wrists and pulls it away from his face— with zero resistance because Sieun's attention is now on his forearm.
Under the soft skin of the limb, the brachioradialis is slightly prominent and Sieun blinks when the muscle shifts as Suho lets go of his hands.
"Suho-ya," Sieun calls, breaking the silence.
"Yeah?" Suho's reply is automatic.
"Take off your shirt."
"What?!" Suho might've lost his hearing, did he hear that right? Sieun waits, his expectant gaze on Suho lasts for a total of 5 seconds before his patience runs out and he takes matters into his own hand. His dexterous fingers unbuttoning the shirt in seconds, Suho sputters.
"S-sieun-ah.." His brain blanks and by the time it starts functioning again, Sieun has tilted Suho's head at an angle and is muttering under his breath. His eyes taking in the expanse of Suho's neck.
"Sternocliedomastoid, connects to the sternum and the clavical. Unilateral action tilts head slightly upward and toward the opposite side. Bilateral action draws the head straight forward and down." Sieun tilts his head the other way, his hands firm.
Suho shudders and closes his eyes when those fingers graze his neck and trail over his shoulder.
"Trapezius, extends and laterally flexes the neck." Sieun tugs his shirt down his arms and his hand is now over the curve of his shoulder.
"Deltoid, Anterior fibers flex and medially rotate arm; lateral fibers abduct arm; posterior fibers extend and laterally rotate arm." The muscle is firm under Sieun's touch, built from all the training Suho does regularly.
Suho bites his lower lip when Sieun's hands move further down his arm, his soft voice reciting information about brachialis, unaware of the way Suho's fists are clenched over the bedsheet.
The cold fingers move to his chest, the touch feather light as if he is handling something fragile, eyes that sweep over his form, studying him with a gaze that is at once glazed over and alert. Suho doesn't get how that works but he doesn't attempt to understand when his own breath is stuck in his lungs beneath Sieun's hand.
A startled gasp leaves his mouth when those cold fingertips lightly graze his nipple. Sieun doesn't seem to notice and continues to trace lines over his abdomen, "Rectus abdominis, flexes the spinal column, tenses the anterior wall of the abdomen and assists in compressing the contents of the abdomen."
Suho reflexively tenses when the hand trails over his abs, prodding at the gap between them. "What were these intersections called again...?" His brows furrow and his eyes meet Suho's wide ones in confusion.
Suho realizes after a few seconds that Sieun is expecting an answer from him, which he can't possibly know and even if he did, he couldn't have told him, his ability to speak was gone the second he felt Sieun's hands on his bare skin.
"I-... uh.." Is all he manages to say, his thoughts are a mess and Sieun looking at him with those sinful lips formed in a pout like that is making him feel things that people don't feel, shouldn't feel for their friends.
"Mm? Tell me, Suho-ya... I need to know, it's gonna be on the exam." His words are strung together lazily, nothing like the way he usually talks. Suho wonders if he is drunk and then immediately stops wondering because Sieun's hands are on him again.
"I don't remember..." His bottom lip juts out even more as his face twists.
Suho forces himself to take a deep breath, slowly, to calm his heart before it explodes. Sieun keeps mumbling, his hands squeezing Suho's sides which makes it even harder for him to not go insane.
Suho tries to grab Sieun, to stop his wandering hands before he loses his mind completely. But Sieun doesn't seem to want to let go, he pushes Suho on his back and pins him to the bed, faces just centimetres apart as their breaths mix together.
Suho cheeks gets progressively warmer as he looks into Sieun's eyes. His expression is serious, all of his cuteness from a while ago replaced by an intense gaze. Suho feels like he's going to get gobbled up by the dark abyss that is Sieun's irises.
"Hyung," Suho doesn't even try to hold back the needy sound that word pulls out of him. Sieun continues, "Your face is so red..." His palm is cool against his cheek and Suho leans further into it.
The air shifts and the clouds part, the moonlight filters through the window and illuminates one half of Sieun's face in a cool blue tone as the other half is washed in the warm light from his table lamp. He looks out of this world and the best thing is that this view is only for Suho's eyes.
Suho's throat goes dry when Sieun starts closing in, he pauses when they're just millimeters apart, his half-lidded eyes are watching Suho. Examining him like he's a fascinating specimen. He waits for Suho to back away or push him off and when neither of this happens, he leans in and kisses him.
He smells like the coffee Suho made him, lips soft and plush as Suho kisses him back, their lips molding together perfectly. Sieun pulls back first, his breathing hard.
The contact was small and brief but it leaves Suho panting, the thin thread that was holding him back snaps, something stirs inside him, a rush of desire so visceral it startles him.
In one quick movement, he pulls Sieun's shirt off and flips him on his back, getting on top of him. He takes a moment to admire the view beneath him. Sieun's pretty eyes staring up at him, his cheeks flushed and his usually neat hair messy. His tan skin is smooth, unblemished, an empty canvas he wants to paint with his kisses.
"You're so perfect, Sieunie."
Suho doesn't waste any more time, diving down and peppering kisses from his neck to his shoulder and then moving down to his chest, whispering praises against his skin. He pauses right over Sieun's heart and presses a tender kiss there before moving up and nipping at the edge of his collarbone. Sharp teeth digging in, he alternates between licking and biting the spot over and over again, it blooms into a pretty hue by the time he pulls back.
He looks at the mark, a satisfied smirk tugging at his lips. His fingers tracing circles over Sieun's skin.
"Hyung..." Suho's ears twitch and he looks up at Sieun.
"Yes, Sieunie?" Suho shifts to get comfortable, brushing up against Sieun in the process and the loud moan he lets out is so hot.
Suho wants to hear it again.
He tugs at Sieun's pants, "Can I...?"
"Please, oh fuck, please."
Suho doesn't need to be told twice, he swiftly pulls Sieun's pants down along with his underwear. His hand immediately wrapping around the hard appendage and he is rewarded with another needy whine as he starts moving.
Suho trails kisses down his abdomen, licking his nipple, biting at his hip bone. He thumbs over the leaking head and Sieun jerks, thrusting up into his hand. Sieun's back is arched up as breathless sounds of pleasure fall from his lips.
Suho's mouth is making quick work of marking every inch of his plush thighs, kissing and nipping the supple skin. He discovers that Sieun is very easily marked, his hickeys already turning purple. "So pretty, Sieun-ah."
Then, his hot breath is right above Sieun. He gives him small, almost shy, licks before taking him into his mouth. Sieun bites his bottom lip to contain his moans and tries his hardest not to thrust up into the warmth surrounding him. Suho only stops when he hits the back of his throat, his tongue laying flat as spit builds up in his mouth.
Sieun's breath stutters at the view, Suho's pretty plump lips wrapped around him, his eyes slightly teary and his face flushed a beautiful shade of red. He starts moving his head up and down, again and again. His hand squeezing what he couldn't fit in his mouth.
Sieun's hand grips at Suho's hair, pulling it harshly. Suho lets out a muffled moan, the vibrations going straight to Sieun's core. Suho's tongue moves sloppily, a mixture of drool and precum sliding out from the corner of his lips. Sieun hisses when sharp teeth drag against him, he thrusts up and Suho chokes but doesn't pull off, instead his speed increases as he takes even more of Sieun, his jaw going slack.
He sets a fast pace, moving his head in sync with Sieun's thrusts. And soon enough, he feels Sieun twitching in his mouth.
"S-suho- ... I'm- ah! 'M gonna cum-" Sieun warns, trying to push him away but Suho doesn't budge, he speeds up even more. His jaw hurts but he pushes his head down until he can't breathe, his eyes blink back the tears and he strains to look up at Sieun's face.
Sieun throws his head back against the pillow, a long drawn out moan is pulled from his throat as his hands fist Suho's hair and hold him down. Suho feels the inside of his throat being painted in thick, warm ropes of cum. He sucks at the softening length as he slowly pulls off of Sieun.
Sieun whimpers at the oversensitivity and if that wasn't enough, he gets a clear view as Suho swallows his cum, licking his lips afterwards, not wasting a single drop. He snaps his eyes shut, focusing on catching his breath instead of thinking about fucking Suho's mouth again.
"Are you alright?" Suho's voice is hoarse, the ache in his jaw persistant.
"Mhm.." Sieun hums in response.
Suho lies down beside him on the bed, his breathing slowly returning to normal.
Once the ache in his throat subsides, he turns to Sieun, only to find him already asleep. "Oh." He looks down at his own pants, straining to contain him. "Oh..." He flops back on the bed, sighs and accepts his fate.
***
Suho wakes up to a set of hands touching him all over. He blinks at the bright light coming from the window, his face scrunched and eyebrows drawn together as he looks down to find Sieun staring at his abs.
He is mumbling something again. Suho leans closer to hear him better, "...called Tendinous intersections. The tendinous inscriptions limit fluid collection beneath the anterior rectus sheath, prevent muscle rupture, and aid in the biomechanics of the rectus abdominis."
"You..." He looks at him dumbfounded.
"Good morning," He greets and goes back to studying Suho.
"You're still thinking about that?!"
"It's gonna be on the test." Sieun simply says, not taking his eyes off of Suho's body.
Suho groans and flips on his stomach, screaming into his pillow.