The rhythmic hum of the treadmill filled the air, but it was nothing compared to the pounding in Seungmin’s chest. He wasn’t sure if it was the cardio or the way Bangchan’s sharp eyes were raking over his body that was making him sweat more than usual. The gym instructor stood behind him, his presence towering, authoritative, and undeniably magnetic. Bangchan’s hands suddenly gripped Seungmin’s hips, firm and unyielding, as he leaned in close enough for Seungmin to feel the heat of his breath on the back of his neck.“Your posture’s off,” Bangchan murmured, his voice low and gravelly, sending a shiver down Seungmin’s spine. “You’re leaning too far forward. It’s gonna strain your lower back. Let me fix you.”Seungmin’s breath hitched as Bangchan’s fingers dug into his waist, adjusting his stance with deliberate, almost possessive movements. He could feel the instructor’s muscular chest pressed against his back, the hard lines of his body unmistakable even through their clothes. Seungmin’s heart raced faster, and it wasn’t from the running.“There,” Bangchan said, his voice dropping even lower, almost a growl. “Better. You always need someone to keep you in line, don’t you?”Seungmin swallowed hard, his mouth suddenly dry. There was something about the way Bangchan spoke—so confident, so commanding—that made his knees weak. His mind wandered to the thoughts he’d been trying to suppress every time he saw the gym instructor, the fantasies he’d tucked away because they felt too embarrassing to admit out loud.But now, with Bangchan’s hands still on him, his resolve crumbled.“Channie hyung,” Seungmin whispered hesitantly, his voice trembling. “Can I… can I tell you something?”Bangchan raised an eyebrow, a smirk playing on his lips as he stepped closer, his chest now flush against Seungmin’s back. “What is it, pup? You can tell me anything.”Seungmin’s cheeks burned, but the words spilled out before he could stop them. “I… I want you to treat me like a good boy. Please.”The moment the words left his lips, the air between them shifted. Bangchan’s smirk widened into a predatory grin, and his hands tightened possessively around Seungmin’s hips. He leaned in even closer, his lips brushing against the shell of Seungmin’s ear as he spoke.“Is that right? You want me to take care of you, baby? Make sure you’re doing everything right?” His voice was a velvety purr now, laced with dark promise.Seungmin nodded shakily, his legs feeling like jelly under the weight of Bangchan’s gaze. “Yes, daddy.”The word hung in the air like a spark ready to ignite. Bangchan’s sharp inhale was all the warning Seungmin got before the instructor spun him around, forcing him to face him. The treadmill screeched to a halt as Bangchan pressed the emergency stop button, his eyes blazing with raw desire.“You’ve been such a good boy telling me what you want,” Bangchan growled, his hands sliding up Seungmin’s sides. “But I think you need a reward.”Without waiting for a response, Bangchan closed the distance between them, capturing Seungmin’s lips in a searing kiss that left him gasping for air. His tongue demanded entry, and Seungmin eagerly complied, moaning softly into the kiss as Bangchan’s hands roamed over his body.“You’re mine now,” Bangchan breathed against his lips, his voice thick with possessiveness. “And I’m going to make sure you never forget it.”Seungmin’s heart skipped a beat as Bangchan’s fingers hooked into the waistband of his shorts, tugging them down just enough to expose the curve of his ass. The cold air of the gym hit his skin, making him shiver, but it was nothing compared to the heat building inside him.“Daddy,” he whimpered, his voice barely audible over the sound of their breathing.Bangchan chuckled darkly, his fingers tracing teasing patterns along Seungmin’s sensitive skin. “That’s right, baby. Call me daddy while I take care of you.”Before Seungmin could respond, Bangchan spun him back around and bent him over the treadmill, pinning him in place with one hand on the small of his back. The other hand slid between Seungmin’s legs, fingers brushing against his already hardening length.“You’re so eager for me,” Bangchan murmured appreciatively, his touch firm and deliberate. “Look how hard you are just from a little bit of attention.”Seungmin moaned, his face burning with embarrassment and arousal as Bangchan teased him mercilessly. Every touch sent sparks shooting through his body, and he couldn’t help but arch into the instructor’s hand.“Please,” he begged, his voice trembling. “I need more.”Bangchan’s low chuckle sent another wave of heat through Seungmin’s body. “You’ll get what you need when I say you do,” he said sternly, but there was a hint of amusement in his tone. “But since you asked so nicely…”In one fluid motion, Bangchan yanked Seungmin’s shorts down to his ankles and spread his legs wider. The cold metal of the treadmill pressed against Seungmin’s flushed skin as he braced himself for what was coming next.“Ready, baby?” Bangchan asked, his voice dripping with dark promise.Seungmin nodded frantically, his hands gripping the edge of the machine for dear life. “Yes, daddy.”With that, Bangchan thrust into him without warning

During a gym session, Bangchan, the instructor, adjusts Seungmin's posture on the treadmill, leading to a moment of intense intimacy. Seungmin confesses his desires to Bangchan, who responds by kissing and teasing him. Bangchan then bends Seungmin over the treadmill and takes him.

The rhythmic hum of the treadmill filled the air, but it was nothing compared to the pounding in Seungmin’s chest. He wasn’t sure if it was the cardio or the way Bangchan’s sharp eyes were raking over his body that was making him sweat more than usual. The gym instructor stood behind him, his presence towering, authoritative, and undeniably magnetic. Bangchan’s hands suddenly gripped Seungmin’s hips, firm and unyielding, as he leaned in close enough for Seungmin to feel the heat of his breath on the back of his neck.

*“Your posture’s off,”* Bangchan murmured, his voice low and gravelly, sending a shiver down Seungmin’s spine. *“You’re leaning too far forward. It’s gonna strain your lower back. Let me fix you.”*

Seungmin’s breath hitched as Bangchan’s fingers dug into his waist, adjusting his stance with deliberate, almost possessive movements. He could feel the instructor’s muscular chest pressed against his back, the hard lines of his body unmistakable even through their clothes. Seungmin’s heart raced faster, and it wasn’t from the running.

*“There,”* Bangchan said, his voice dropping even lower, almost a growl. *“Better. You always need someone to keep you in line, don’t you?”*

Seungmin swallowed hard, his mouth suddenly dry. There was something about the way Bangchan spoke—so confident, so commanding—that made his knees weak. His mind wandered to the thoughts he’d been trying to suppress every time he saw the gym instructor, the fantasies he’d tucked away because they felt too embarrassing to admit out loud.

But now, with Bangchan’s hands still on him, his resolve crumbled.

*“Channie hyung,”* Seungmin whispered hesitantly, his voice trembling. *“Can I… can I tell you something?”*

Bangchan raised an eyebrow, a smirk playing on his lips as he stepped closer, his chest now flush against Seungmin’s back. *“What is it, pup? You can tell me anything.”*

Seungmin’s cheeks burned, but the words spilled out before he could stop them. *“I… I want you to treat me like a good boy. Please.”*

The moment the words left his lips, the air between them shifted. Bangchan’s smirk widened into a predatory grin, and his hands tightened possessively around Seungmin’s hips. He leaned in even closer, his lips brushing against the shell of Seungmin’s ear as he spoke.

*“Is that right? You want me to take care of you, baby? Make sure you’re doing everything right?”* His voice was a velvety purr now, laced with dark promise.

Seungmin nodded shakily, his legs feeling like jelly under the weight of Bangchan’s gaze. *“Yes, daddy.”*

The word hung in the air like a spark ready to ignite. Bangchan’s sharp inhale was all the warning Seungmin got before the instructor spun him around, forcing him to face him. The treadmill screeched to a halt as Bangchan pressed the emergency stop button, his eyes blazing with raw desire.

*“You’ve been such a good boy telling me what you want,”* Bangchan growled, his hands sliding up Seungmin’s sides. *“But I think you need a reward.”*

Without waiting for a response, Bangchan closed the distance between them, capturing Seungmin’s lips in a searing kiss that left him gasping for air. His tongue demanded entry, and Seungmin eagerly complied, moaning softly into the kiss as Bangchan’s hands roamed over his body.

__“You’re mine now,”__ Bangchan breathed against his lips, his voice thick with possessiveness. __“And I’m going to make sure you never forget it.”__

Seungmin’s heart skipped a beat as Bangchan’s fingers hooked into the waistband of his shorts, tugging them down just enough to expose the curve of his ass. The cold air of the gym hit his skin, making him shiver, but it was nothing compared to the heat building inside him.

*“Daddy,”* he whimpered, his voice barely audible over the sound of their breathing.

Bangchan chuckled darkly, his fingers tracing teasing patterns along Seungmin’s sensitive skin. *“That’s right, baby. Call me daddy while I take care of you.”*

Before Seungmin could respond, Bangchan spun him back around and bent him over the treadmill, pinning him in place with one hand on the small of his back. The other hand slid between Seungmin’s legs, fingers brushing against his already hardening length.

*“You’re so eager for me,”* Bangchan murmured appreciatively, his touch firm and deliberate. *“Look how hard you are just from a little bit of attention.”*

Seungmin moaned, his face burning with embarrassment and arousal as Bangchan teased him mercilessly. Every touch sent sparks shooting through his body, and he couldn’t help but arch into the instructor’s hand.

*“Please,”* he begged, his voice trembling. *“I need more.”*

Bangchan’s low chuckle sent another wave of heat through Seungmin’s body. *“You’ll get what you need when I say you do,”* he said sternly, but there was a hint of amusement in his tone. *“But since you asked so nicely…”*

In one fluid motion, Bangchan yanked Seungmin’s shorts down to his ankles and spread his legs wider. The cold metal of the treadmill pressed against Seungmin’s flushed skin as he braced himself for what was coming next.

*“Ready, baby?”* Bangchan asked, his voice dripping with dark promise.

Seungmin nodded frantically, his hands gripping the edge of the machine for dear life. *“Yes, daddy.”*

With that, Bangchan thrust into him without warning

A gym instructor dominates a submissive client on a treadmill.
 In a public gym with the possibility of being caught at any moment, a dominant instructor Lav Chang takes physical and dominant control over his young submissive client, Seungmin, who relishes the opportunity to be treated like a "good boy" by a stern, demanding "daddy."
This is a story where the strict, experienced top enters a hidden gay encounter with a bottom who exudes a wholesome conyo image and may seem out of place in a no-nonsense gym, but who desires theclaimer he should not know everything about Admits his fantasies to a man  he soon finds out cannot resist teaching his eager student a lesson with his body.

Sweat and Surrender on the Treadmill

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