Work Text:
“Ch-chanbin! This feels kinda weird.” Felix groaned, his cheeks turning red from embarrassment.
“Don’t worry Felix. This stretch is really good for your hamstrings. It’s important that your muscles are nice and loose before you start your workout.” Changbin reassured him.
“Ummm o-okay.” the blonde boy responded with worry in his voice.
All Felix wanted to do was give the gym a try. What’s the harm he thought. It would be good to get some exercise and start to build some muscle. He arrived at the facility early in the morning dressed in his cute new gym clothes with his handy gym bag around his shoulder. The woman at the desk was sweet but a little over excited. She started asking all these questions about prior gym experience and what classes he was interested in taking.
“Well, it’s actually my first time at the gym so I think I’ll just test the waters and go at my own pace,” Felix said with a smile
“Oh it’s your first time? You know you should really have a session with one of our personal trainers. That way they can show you the ropes and you won’t risk getting injured,” the woman at the desk suggested.
“Ah that’s okay-“
“We actually have a session available right now with one of our most experienced trainers, Seo Changbin.”
“No, really I’m fine-“
“Oh look, here he comes now.” the woman waved to someone down the hall.
Felix turned his head and laid eyes on a dark haired, sharp jawed man, with a physique that left his knees weak. He wore a tight fitted, black short sleeve shirt that highlighted his bulging biceps and juicy pecs. His shorts went just above his thighs showing off his thick calves that possessed veins you could trace with your fingers.
“So, what do you say? Should I book you a session with him?”
“Ummm, sure why not?” Felix caved, not bothering to take his eyes off the muscular jock.
And that's how he ended up in a private workout room, on his back with his legs spread. Changbin was kneeling behind his head, pressing down on the boy’s bare upper thighs to keep him in the right position and make sure he got the most out of the stretch.
Felix hated how this position made him feel. A mix of both embarrassment and arousal. And it wasn’t helping that his face was practically pressed up against Changbins crotch. If he looked close enough he could almost see the outline of his…
“How much longer do we have to do this?” Felix asked with insistence.
“Just another minute or so. Really try to push through till the end,” Changbin encouraged him.
Felix could feel his black gym shorts riding up high, giving him a wedgie and leaving very little of his milky toned legs concealed. It was definitely a bad choice not to wear underwear.
Changbin’s hands were so close to his crotch, tightly clutching onto the soft flesh of thighs. He could sense his blood rushing to his groin. Oh god, I can’t get a boner. Not now. He’ll totally see it.
“Alright, that’s enough,” Changbin announced, releasing his grip on Felix’s legs and sitting up straight. Thank god, Felix thought, breathing a sigh of relief as he closed his legs and sat up on the yoga mat.
The next stretch however wasn’t much better. Changbin had Felix on his hands and knees with his cheek pressed against the cool surface of the yoga mat.
“Really arch your back now, Felix,” Changbin coached him, pushing his hands down on the small of the younger ones' back.
“Ummm, okay,” Felix winced, arching his back into a deeper stretch and sticking his butt back further, pushing against Changbins hips. His eyes widened and his breath hitched as he felt something hard prod against his ass. What the fuck? Is that his dick?
“That’s it just like that,” Changbin said in a breathy voice. Did he really get boner from helping me stretch? Is that normal? Was I the one who caused it?
“You okay there Felix?” Changbin asked, leaning down further and pushing his pelvis right up against the younger’s ass . Felix felt the thick shaft of his length press between his butt cheeks, causing him to let out a soft moan.
“Y-yeah I’m fine haha,” Felix tried to play it cool. Fuck, this feels weird. Especially since he’s so…big.
“Okay, that’s enough for this stretch,” Changbin said, releasing his hold on Felix’s back and giving him a smack on the ass as he stood up on his feet. What the fuck. Okay, there’s no way I’m imagining this. Does he wanna fuck or something?
Felix sat up on his knees and turned around to face Changbin. His eyes widened at the sight of the older boy’s long, thick boner shamelessly pressing against the fabric of his shorts. There was practically nothing left to the imagination. It was tucked to the left with its head perfectly imprinted, and the outline of his heavy balls could be seen hanging between his legs.
“Alright, now let’s get started on the real workout,” Changbin said, slapping his hands together. Felix tried his best to keep his gaze up at Changbin’s face, but it was impossible not to stare at the bulging outline of his cock in his shorts. Is he not embarrassed? His boner is basically on full display, and he doesn’t seem to care in the slightest. It’s like he wants me to see how giant dick is.
“O-okay, s-sure,” Felix stuttered.
They ended up at the squatting rack, the bar resting on Felix’s shoulders holding a 50 pound weight. Changbin stood directly behind him to help spot him. He had his hands on the younger’s hips and his fully erect length pressed snuggly up against Felix’s backside. He has to be doing this on purpose. There’s no need for us to be this close together. He’s practically inside me.
“Now when you squat, make sure to focus on only moving your lower body and keep your shoulders in place,” Changbin said.
“Okay, I’ll try,” Felix bent his knees and lowered his body, arching his back with Changbin squatting along with him.
“That’s good Felix, really try to get nice and low now,” Changbin praised him, groping the boy’s butt as he did. Oh my god, this is getting ridiculous.
Felix tried his best to keep his form but the weight (plus the feeling of Changbin’s huge boner against his ass) was too much for him.“Aggh, I think it’s too heavy for me,” he winced as he struggled to stand up straight and complete the rep.
“That’s okay, we can lower the weight so it’s more manageable. In fact, why don’t we try squatting without any weight and just focus on your form” Changbin suggested. Felix nodded, releasing the bar.
Changbin grabbed the workout bench that was located to the left of them and moved it over in between Felix’s legs. “Alright, now try squatting so that your rear touches the bench but still keeping in form,” Changbin said.
“Sure.” Felix put his arms out straight and attempted to squat down.
“Hmm, you're still not quite getting it. Let’s try this.” Changbin circled around in front of Felix and laid down on the bench below him with his head between his legs. “Try to squat so your ass reaches my face.”
Huh?!?! He can’t be serious? “Uhhh, isn’t that a little weird-“
“Just trust me Felix.”
“O-Okay.” Felix hesitantly squatted down, abruptly standing up straight once he felt the tip of Changbin’s nose brush up against the fabric of his shorts.
“Good, but you can go lower than that,” Changbin said in a husky voice.
Fuck, does he really just want me to sit on his face? He decided to take a risk and give Changbin what he wanted. He squatted down slowly, taking a pause once he felt Changbin’s nose bury in the crack of his ass.
“Mhmmm,” Changbin moaned against Felix’s butt cheeks, taking in the salty, ripeness of his scent.
The sound of Changbin’s moans and the feeling of his face pressed against his rim made Felix’s hormones race, making him savagely horny. His squats quickly became deeper and more bold, giving Changbin a face full of his ass each time. He was now fully hard, his boner bouncing up and down in his shorts with each rep.
“That’s a good boy Felix, just like that,” Changbin groaned, groping the younger boy’s butt as he squatted up and down on his face.
Felix was almost moaning now, the feeling of the older boy’s face pressing against his rim over and over again giving him an arousing pleasure. It was clear now that their workout had become sexual, but how far it was gonna go, Felix wasn’t sure.
Just when he least expected it, Changbin stripped down the back of Felix’s shorts just below his butt, startling the younger boy.
What the fuck?
The older man's eyes brightened at the sight of the boy’s smooth, creamy ass cheeks sitting right above his face. Felix moaned as he felt the cool air brush up against his glossy back side giving him shivering goosebumps.
“Mhmm, looks tasty,” Changbin moaned, kneading the jiggly flesh of his butt.
“Ahhh, Changbin that feels weird,” Felix whined, still squatting over his face.
“Ohhh, so you want me to stop?” Changbin asked in a teasing tone, spreading the younger boy’s cheeks apart and grazing his finger against the sweat soaked rim.
“Ch- changbin, oh god it’s so sensitive,” Felix whimpered, squatting down deeper and succumbing to the perverted pleasure.
“Hmmm, you like that don’t you?” Changbin hummed, swirling two fingers around the younger boy’s pretty pink hole. He then boldly pushed the digits inside pressing against his sensitive walls and feeling the boy clench around his fingers.
“Ahhh fuck,” Felix moaned, bending over and clutching onto the bench below him for dear life.
“You’re so tight Felix. Let me loosen you up,” Changbin said, circling the digit’s around inside him.
The way the older boy’s fingers prodded his insides sent shockwaves of pleasure through his body, making his knees shudder and his eyes roll back. He felt so dirty letting an almost complete stranger touch him in such an intimate way, and in a public place too. But still, it turned him on so much.
To his dismay he felt Changbin’s fingers soon slide out, leaving him painfully empty. But the feeling was quickly replaced with the slippery, wet sensation of the older boy’s tongue gliding against his rim. Shivers ran up his spine as Changbin worked his tongue around his juicy hole, giving him an aching, teasing pleasure that left him needing more.
“Please, go deeper,” Felix begged, rolling his hips against Changbin’s face to increase the stimulation. The older boy gave him exactly what he wanted, spreading the boy’s soft cheeks apart and driving his tongue inside his tight, little entrance, taking in the tangy taste of his glory.
Felix cried out in pleasure at the feeling of Changbin eating him out, his cock spilling trails of pre cum into his shorts. He rocked his body back and forth, fucking himself on the older boy’s tongue and letting him explore his insides.
As he continued to devour Felix’s ass, Changbin slid his hand down the hem of his shorts and stripped them just below his hips, his fat cock bouncing out of the fabric in front of the boy’s face. The younger’s jaw dropped at the sight of the thick meat, standing up straight only inches away from his lips, staring at the pink juicy tip dripping with pre-cum.
“It’s so big,” Felix moaned in a whisper, curling his fingers around the shaft and tightly squeezing the warm flesh. He slowly ran his fist up and down the glorious cock with awe, mesmerized by the sheer thickness of the length. He had never seen a dick this big in person and couldn’t help but wonder what it would feel like inside him.
Changbin bucked his hips at the feeling of Felix’s touch, the sensation urging him to drive his tongue deeper and more aggressively inside his hole. He kept a tight hold on Felix’s hips, keeping the boy from fidgeting and running away from the pleasure as he feasted on his ass.
Whimpers and whines spilled from Felix’s lips as the older boy’s tongue slid in and out of his entrance, continuing to pump his length with great vigor, feeling it twitch in his hand. He couldn’t stop himself from plunging his lips around the fathead, sucking against the warm flesh and tasting the saltiness of his precum.
Changbin moaned against his ass as he felt the wetness of Felix’s lips and tongue against his length, the younger boy bobbing his head up and down, and sliding the cock in and out of his mouth.
“That’s a good boy,” he hummed, taking his face away from Felix’s ass, spreading his cheeks and giving him a rough spank. Felix whimpered around his cock in response to the stinging sensation, fitting more and more of the length down his throat and slurping on the tasty shaft with immense hunger.
Changbin soon began bucking his hips up towards the wet heat of his mouth, stuffing the boy’s throat and making him choke and spit all over his dick. The bench below him rattled with his rough movements making a loud clanging noise, the two of them not giving a thought to who could hear them out in the hallway.
Felix dug his nails into the flesh of Changbin’s thighs in order to handle the throat fucking, his eyes watering and his jaw aching from the vigorous thrusts of his dick. But it turned him on so much. He loved being able to worship such a monster cock, to be able to taste it and feel it fill up his throat.
“Fuck, your mouth feels good, I bet your ass feels even better.” Changbin moaned as he watched Felix’s pink juicy hole wink at him.
“Please, fuck my ass,” Felix pleaded pulling his mouth off Changbin’s cock and squeezing the pink head with his fist.
That was all the older boy needed to hear. He gripped Felix’s waist and effortlessly flipped him over so his back laid on top of him, facing up towards the ceiling. He stripped off the boy’s shorts fully and threw them to the side, lifting his legs up by the ankles and spreading them apart.
“Nnnng, Changbin,” Felix whimpered, feeling the stretch of his hole being spread.
“You want my dick baby,” Changbin teased, tapping the head of his cock against his entrance.
“Yes, I want it,” Felix breathed out in a broken moan, biting down on his lip.
“Mhmmm, let’s get you stuffed.” Changbin adjusted the angle of the bench so they were in a more upright position, then grabbed a packet of lube from his shorts pocket and coated his fingers in the substance.
Felix looked down between his thighs, watching the older boy slick his cock in the sticky liquid, entranced by the way he moved his fist up and down the thick length, making it nice and wet. He needed to feel it inside him, stretching his hole and pumping in and out until he could barely walk. He spread his fluffy cheeks apart and let out a needy whine in an attempt to urge Changbin to fill him up faster.
“Look at you, all horny and desperate. You gonna take my dick like a good boy?” Changbin pushed the tip of his cock against the boy’s hole, attempting to slide it inside.
“Mmmh yes,” Felix moaned, preparing himself for what’s to come. He arched his back and let out a whine as he felt the fat head of Changbin’s cock penetrate inside, his hole stretching around the thickness, creating a stinging but arousing sensation in his ass.
“Ooooh yes,” Changbin cooed in Felix’s ear, holding onto the boy’s hips to keep him still as the rest of his cock was consumed inside his tight little hole. Felix was already a whimpering mess, his toes curling and his eyes watering as he clenched around the entirety of Changbin’s cock.
“Nnnng, I feel so full,” Felix whined, leaning back against the older boy’s chest, doing his best to adjust to his size.
“Shit, you're tight,” Changbin grunted, spreading the boy’s cheeks apart and steadily beginning to move him up and down on his length, moaning as he felt his velvety walls drag against him.
“Aggh, Ch- Changbin I don’t think I can take it,” Felix sobbed squirming in place, already overwhelmed by the intensity of the penetration.
“Just relax baby, it’ll feel good soon,” Changbin reassured him, holding onto his thighs and fucking him on his dick at a faster and deeper pace. Felix’s hole slurped up his cock in its eternity, making a wet squelching sound as it pumped in and out. His pink cock was leaking profusely down his thigh, twitching and throbbing each time he slammed back down on Changbin’s length. He couldn’t fathom that such a big dick was inside him, every little movement making his whole body spasm with arousal.
But he was addicted to the sensation. Addicted to the way his hole stretched and pulsed. The way his insides felt like they could come out each time the cock slid out of his ass. The warm, tingling stimulation pooling in his stomach.
Changbin began bucking his hips up into the tight heat to chase the pleasure, his hips slapping against Felix’s ass cheeks repeatedly, making a loud clapping sound.
“Fuck!” Felix cried out, throwing his head back as Changbin struck his prostate, the older boy grinning in pleasure as he watched him come undone. He repeatedly fucked into the sensitive area, grunting and groaning as he stroked his dick against the younger boy’s warm, tight walls.
“You like this don’t you,” Changbin teased, lifting the younger’s legs up higher so he could fuck into him easier. Felix was tearing up, his insides being ruthlessly plowed and spread open, moans spilling from his lips.
“Aggh, Changbin I’m gonna-“ Without warning his orgasm arrived, spurts of cum squirting out of his throbbing dick high into the air, coating his thighs and the bench below in the white hot liquid. He was a vibrating mess, his vision becoming hazy as arousal consumed him, clenching around Changbin’s thrusting cock as he was fucked through his climax.
“That’s a good boy,” Changbin praised, holding the younger’s hips to stop him from running away from his dick, not slowing down his thrusts for a second. The ache of the post orgasm pleasure soon set in, but Changbin wasn’t ready to slow down yet.
He lifted Felix up by the waist and practically threw him to the ground, mercilessly shoving his length back inside and continuing his vigorous pace. The younger boy was now face down, ass up on the yoga mat, whimpering like mad with the way Changbin slammed his cock in and out of his hole. They both quickly lost their t-shirts, now wearing only their socks, their smooth naked bodies gleaming and dripping with sweat.
Changbin’s pecs jiggled with each thrust, sitting up on his knees, gripping the younger boy’s hips and letting out breathy grunts and groans as his pelvis clapped against his ass. His stamina was unrelenting, keeping up the ruthless pace of his thrusts, not giving Felix a chance to breathe.
“Oh my god, I can’t feel my legs,” the younger boy moaned out, his head hanging down, looking back at Changbin railing into him. His hole was a sloppy wet mess, stuffed with the fat dick and leaking out a filthy mix of lube, cum, and juices. He attempted to run away from the pleasure, but that only spurred Changbin on, holding onto him tight and fucking into him deeper.
Felix’s own length was already reawakened, slapping hard against his stomach with each thrust and spilling out trials of pre-cum. His skin was hot and flushed, his whole body sizzling with overstimulation. His mind was being fucked numb, unable to think about anything other than Changbin’s thick cock railing through his guts.
Before long, his second orgasm hit, a harsh moan escaping his lips as he squirted his load out onto the floor, his body spazzing as the aching stimulation struck.
“Fuck,” he whimpered collapsing his upper body down on the yoga mat.
“Shit, you love my dick that much huh?” the older boy teased breathlessly, feeling Felix clench around his dick as he continued to ruthlessly wreck his ass from behind.
“Nnnng, it’s so big, I can’t take it,” Felix whined in a broken moan.
“Oh baby, just a little bit longer, I’m almost there,” Changbin panted, spreading the younger boy’s cheeks and pumping his cock in and out. “Mhmm, I’m gonna fill your ass with my cum.”
“Yes, give it to me,” Felix moaned.
Changbin abruptly flipped the boy over on his back, spreading his legs and putting his face close to his as he re-entered him. “I wanna look at you when I cum.”
He bucked his hips fast, his beefy muscle butt jiggling with each thrust inside the younger’s stretched out hole. His sweat soaked thighs slapped hard against the younger boy’s plump, red ass, his strokes becoming sloppy as he fucked into the poor boy with a sense of urgency, recklessly chasing his orgasm. He had his fists clenched and pressed down on the yoga mat either side of Felix’s head, gritting his teeth and staring down at the cute, filthy facial expressions the younger boy made as he fucked the life out of him.
Tears streamed down Felix’s cheeks as he tried to handle the intensity of his hole being used, incessant desperate moans spilling out from his lips and into Changbin’s ear. His legs were held back almost past his head, giving Changbin good access to his hole, as he clawed feverishly at the older boy’s broad muscular shoulders.
“Yes, yes, yes,” Changbin chanted as he reached the point of overstimulation. And with a few more slams of his cock he was cumming hot and thick, throbbing inside Felix’s ruined hole and spraying his walls white. He threw his head back in pleasure as the arousal struck, letting out a deep husky groan as he grinded his dick to completion.
The warm delicious feeling of his ass being filled was enough to send Felix over the edge for a third time, arching his back and letting out an aching whine as he spurted out ribbons of cum, his dick sandwiched between their two naked bodies grinding together. He was seeing stars now, his mind having been fucked to oblivion, laying lifelessly on the yoga mat with Changbin collapsed on top of him.
Once they both finally caught their breath and the high had faded, Changbin sat up on his knees and slid his cock out of the boy’s ruined hole, watching with awe as trails of his cum leaked out of him. Felix kept his aching legs spread, his eyes weary and half shut, feeling ready for a nap.
“Well, I’d say that was a pretty successful workout,” Changbin remarked, flopping down on his stomach next to Felix, the two of them letting out a breathless chuckle.
“Yeah I'd say so. Do you think we could make this a regular session?” Felix asked with a groggy smile, turning his head to the older boy.
“For you, anything.”