Work Text:
Week four into his routine, Kenma has stopped being annoyed at Taketora for getting him a gym membership for his birthday. Originally Kenma was going to let the membership sit untouched but then Taketora had made a comment about it in their group chat and Fukunaga joined in on the teasing and Kenma just wanted them all to shut the fuck up, so he went.
Thankfully it was one of those 24-hour gyms in the city. Which meant Kenma wasn’t too out of place when he walked in at almost 2 am on a Tuesday night. It’s easiest for him with his stream and sleep schedule. And even more important, the late shift is when Kuroo Tetsurou works.
Kuroo works for the gym as a personal trainer and helped Kenma on his first night there. Kenma isn’t sure if his flirting was to get Kenma to come back or was a show of genuine interest but either way it worked. Kenma has been back every Tuesday night to let Kuroo touch and move his body into the correct position for this stretch or that exercise.
He pulls his hair back in a ponytail, shakes the loose bits of his bangs out of his face. He wonders if Kuroo will notice that his shorts are shorter this week. He ordered a pair at least two sizes too small a couple weeks ago and has finally worked up the courage (or desperation) to wear them. He tucks in the corner of his shirt when he realises leaving it untucked would completely conceal that he was wearing shorts at all. He smooths a hand down the thin material of the workout bottoms, feels the way the fabric ends just below the curve of his ass. He’s sure he’s blushing. At least that will be hidden by the flush of exercise soon enough.
“Ah, Kozume, you’re here.” Kuroo smiles when he sees Kenma walk out of the locker room. The gym is especially dead tonight, with only a couple of other members dotting the floor space.
“Hello.” Kenma eyes linger on Kuroo’s arms, drag across his chest. Large mirrors line the entire space giving those working out an opportunity to adjust their form from any angle. For Kenma, it lets him watch Kuroo’s body as he demonstrates again and again deep squats and lunges.
Kuroo seems to forget himself for a moment, the silence between them stretching for longer than usual. His eyes drift to the space beside Kenma’s head before snapping back to his eyes. “Come on this way. I thought we’d do some bodyweight exercise today.”
He leads Kenma to a back corner of the room where a set of mats are already spread out for them.
“What’s that?”
“Uses your body’s mass and gravity as the resistance for a workout.”
“You make it sound so official but what you’re really saying is you’re making me spend money on a gym work out without any of the gym equipment.”
“The money is spent on my expertise Kozume.” Kuroo smirks at him and Kenma rolls his eyes.
“I should get a discount then.”
“Smartass.” Kuroo chides him. “You’re only here once a week based on your sign ins so I thought it’d be good to give you some things you could do at home.”
Kenma makes a distressed face at the thought. He only works out here so he can ogle Kuroo for an hour and then go home and jerk off. What would be the point of working out at home? “Fine.” Kenma relents.
“Oh, that’s pitiful. Where’s your enthusiasm?”
Kenma smiles and he’s sure it comes off as pissed off. “Yes, captain.”
That seems to catch Kuroo off guard. He takes a step closer. Kenma’s forced to look up to meet his eye. “Good boy.” Kenma bites the inside of his cheek as Kuroo’s praise tingles down his spine. “Let’s start with squats.”
Kenma makes a show of dropping his water bottle at the side of the room. While he’s at it he stays bent over to check the laces on his shoes. Safety in the gym or something like that.
“Feet shoulder width apart.” Kuroo kicks Kenma’s legs apart with the tip of his shoe. “Keep your back straight.” Kuroo pushes a large hand against Kenma’s chest.
Kenma stares at their reflection. The way Kuroo’s body is so much larger than his, the way his hand could wrap around his waist and take up so much space. Kenma’s stomach drops at the thought.
“Set of fifteen. Ready?” Kuroo moves so they’re standing beside each other. Kenma nods his assent, not sure if his voice will come out sounding needy.
Kuroo starts counting as Kenma begins the set, bending low in the knee to work his quads. Kuroo moves around his body to check his form. Kenma sees the way his eyes trail down Kenma’s back, along his legs. With each deep squat, Kenma’s shorts ride up. He’s sure Kuroo can see the skin of his ass now, the curve where the fat of his thighs meets his ass cheek.
Kuroo sounds different when he reaches his count of fifteen. “Good.” He nods his head at Kenma in the mirror. “Thirty second break and we’ll do some glutes.” Kuroo moves to sit on his mat and Kenma follows. “Here’s what’s next.”
Kuroo lays on his back, knees bent and feet flat to the floor. Kenma almost lets out a sound when he watches Kuroo’s hips push up. The flat plane of Kuroo’s chest and stomach leading to the tempting bulge of Kuroo’s groin. “It’s called a marching glute bridge.” Kenma couldn’t care less about what it’s called. “Alright. On your back.”
Kenma does as he’s told. Kuroo’s hands move him in place. Bends his legs, spreads his feet just far enough apart to keep him steady. A hand on the dip of his lower back pushes up until Kenma’s hips are off the ground.
“Mmm. That’s it.” Kuroo probably means to compliment his form but it comes out too low for that. Kenma squeezes his eyes shut as he feels the effects of Kuroo’s touch, Kuroo’s voice, the effect of Kuroo take hold on his body. “Oh, uh, Kenma.” Kuroo’s almost at a whisper now. The sound of Kenma’s given name coming from Kuroo’s lips only adds fire to the want inside him.
Kenma is stuck in place from embarrassment, his hardening cock pushed up and toward Kuroo. “I’m sorry.” His heart hammers against his ribcage.
“Tell me to stop.” Kuroo’s words rush out right before Kenma feels Kuroo palm him through the thin material of his shorts. Kuroo’s other large, capable hand coming to support Kenma’s lower back and keep him in place, hips jutting forward and on display.
Kenma’s eyes snap open, lock on Kuroo’s face. He looks transfixed by Kenma’s body as he keeps rubbing Kenma off. “Kuroo.” Kuroo looks to him. His hand stops. Kenma squeezes his eyes shut. “Keep going.”
Kuroo lets out a groan, or maybe it’s closer to a growl as he goes back to working the underside of Kenma’s cock through his clothes. The hand on Kenma’s back pushes down and into his shorts, long callused fingers dig into the give of Kenma’s ass. “You’re such a tease.” Kuroo grips his backside over and over. Kenma wonders if he’s going to come in his pants like a fucking teenager.
“M’not.” Kenma’s looking at him, eyes half-lidded, words slurred.
Kuroo laughs. “I could rip these off of you if I wanted.” The hand on Kenma’s front clutches the fabric, pulls it. Kenma’s cock peaks up over the waistband.
Kenma whines. “Kuroo.” It's backwards Kuroo is the tease.
Kuroo manhandles him easily into a standing position. Kenma’s eyes dart around the room, his heartrate is a frenzied mess as he takes in the fact that they’re the only ones here. Any other late-night members seem to have left. Kuroo’s standing behind him again. His form engulfs Kenma’s in the mirror. He leans down to bite and suck at Kenma’s shoulder. Somehow, Kuroo sounds more ruined over this than Kenma does. “Tell me to stop.” He repeats. “I’m going to keep going unless you tell me you don’t want it.”
“I want it.” Kenma’s voice shakes with the request.
“Fuck.” Kuroo curses as one of his hands drags down Kenma’s shorts until they’re stuck mid-thigh, the other pushes at his shirt to reveal his hard, pink nipples. “Ah, shit.”
Kenma moans out in response and Kuroo pushes Kenma's shirt into his mouth, gagging him and keeping him quiet. It’s overwhelming – seeing Kuroo jerking him off, hearing the Kuroo’s small pleas and praises in his ear. He likes watching them together. It’s enough to push past any embarrassment and drive Kenma to the edge very quickly.
Kuroo’s clothed cock pushes against Kenma’s bare backside and Kenma whines around his cloth gag. Kuroo’s holding him up at this point – Kenma’s legs losing strength as he fucks into Kuroo’s hand.
“You look so good like this.” Kuroo’s hand comes up to rest on his throat, his thumb and index finger grabbing his chin and turning his head to the side. The next moment they’re kissing, deep and messy. Kenma lets out a final moan into Kuroo’s mouth as he comes in Kuroo’s hand. When Kuroo takes off his shirt to wipe off his hand, Kenma falls to his knees.
“Kenma.” Kuroo almost sounds sweeter now. Kenma looks up at him, his hands resting on Kuroo’s waistband.
“Look at yourself.” Kenma instructs and Kuroo looks up to watch them in the mirror. Pulling Kuroo’s shorts low enough to get to his cock, Kenma takes him in hand and begins sucking. He leans forward, flattens his tongue to lick Kuroo from the bottom of his balls all the way up to the head of his cock. Kuroo swears and stutters above him, a hand moving to grab at Kenma’s hair.
Kenma focusses on making it messy, on getting Kuroo hot and wet and ruined. Kenma sucks and licks at Kuroo’s balls while his hand jerks Kuroo’s shaft. His palm rubbing gently at the head of Kuroo’s cock now slick with spit and precome. He works Kuroo’s cock with precision, watching and listening for what Kuroo likes best.
When Kenma thinks that Kuroo is close he stops, holds Kuroo’s cock still until Kuroo looks down at him. Keeping eye contact, Kenma places the tip of Kuroo’s cock on his tongue. He laps at the sensitive underside of Kuroo’s cockhead while his hand continues to stroke. He does his best to keep his mouth open wide, to keep his tongue the perfect place for Kuroo to unload.
With a few more strokes Kenma watches Kuroo’s eyes go glassy as his body stiffens and he shoots into Kenma’s mouth. He blinks through Kuroo’s orgasm, does his best to swallow the large shot of come, some of the mouthful dripping out past his lips. “Fuck, shit - fuck.” Kuroo’s still gripping Kenma’s hair tightly as the orgasm moves through him.
Kenma hums his approval. Holding Kuroo’s spent cock, he licks the sides while Kuroo comes down. Kuroo lets go of Kenma, a half laugh half exasperated exhale coming from his throat. “I don’t – I haven’t ever done that. Here.” He tacks on the last word.
Kenma is still seated on the ground when he shrugs. He moves on his knees to grab Kuroo’s discarded t-shirt and wipes at his mouth. “Is it okay that we did?”
“Probably not.” Kuroo laughs, offers a hand to help Kenma up. “I’d definitely get fired if anyone knew.”
“So, don’t tell anyone.” Kenma challenges. Kuroo squints at him before leaning forward and kissing Kenma. It’s slower than last time, softer. But no less intense. Kenma settles back on the flats of his feet when they break apart.
“Want to go get coffee some time?” Kuroo asks but his face has a smug smile like he already knows the answer.
Kenma nods. “Alright. I drink a lot of coffee. You might not know this but I have a terrible sleep schedule.”
Kuroo's laugh fills the room. ~💕