35
The trainer, who had been measuring Hyeonjun’s erection angle, length, and girth, suddenly gripped his cock tightly. The rough, large hand surprisingly handled Hyeonjun’s shaft with delicate care. Always used to pleasuring others, having someone else stroke him was far more exciting. Unable to hold back, Hyeonjun came right then and there.
The trainer, who had been holding a paper cup to catch his ejaculate, noted the approximate volume before speaking.
“Good. The measurements are done. Now, we need to set your target goals… Hyeonjun, why did you come here? Ah, I see you checked ‘pregnant,’ and your muscle strength is quite low, so I won’t make you do strenuous exercises. Do you want a muscular physique like those fitness guys outside?”
“No, it’s not that… I actually just came to look around.”
He ended up confessing the truth. The trainer looked slightly troubled before handing Hyeonjun a terminal. The screen flashed with various program advertisements:
[Now, AI takes charge of your sex life too! A sexier life awaits you!]
[Basic Technique Training with AI]
As Hyeonjun skimmed through the promotional text, he asked the trainer:
“Does the AI manage everything?”
“Yes, I just handle membership registration, guidance, and cleaning. The actual training coaches are mostly AI. We used to have four human trainers, but the facility switched to AI recently.”
The trainer’s tone carried a hint of bitterness. While personal AI assistants were commonplace for professionals, using AI for sex training still felt odd.
“Hmm, I’ve never worked out before… Is there something more customized?”
“Then this would be good for you. Your stamina is average, but your sexual sensitivity is evaluated as quite high.”
After briefly scanning the menu, the trainer registered a course for him. Hyeonjun’s fitness band then emitted an AI voice:
[Welcome, Hyeonjun. I will be your personal trainer responsible for your healthy sex life. Thank you for signing up for the enhanced sex technique program.]
“Now, just go out and exercise. There are functional condoms next to the water dispenser—grab one and use it.”
“Ah, thank you.”
[Starting Day 1 training. First, please go to Machine #1 for warm-up exercises. To prevent contamination, be sure to use a new condom.]
Following the instructions, Hyeonjun rolled a condom onto his own cock and moved to Machine #1. It resembled a typical strength-training machine, but with one key difference—a thick, protruding dildo in the center. He’d tried various dildos, from textured to slim, but this one was the most standard—so lifelike it was almost embarrassing.
[Please put a condom on the machine. Then press the start button beside it. Warm-up will proceed for 5 minutes.]
Hyeonjun spread his legs on the machine and lowered himself onto it. The sensation was familiar, but the size pressed against him with noticeable pressure.
“Huu… if I turn it on… will it work?”
The moment he pressed the power button, the dildo inside him warmed up. Soon, a soft zzz vibration began.
“Hngh… ah… haa… ugh…”
Like the others using the machines, he let out lewd moans, gripping the handles. His legs were spread wide, his ass fully exposed as it took the dildo. It began rotating slowly, pistoning on its own. The heating function combined with the leisurely pace gradually stoked his arousal. Though the dildo was thick, it wasn’t long enough to fully satisfy him—just enough to tease his orgasm to the edge. Desperate for more, Hyeonjun panted and reached to fondle his own chest. The moment his fingers tweaked his nipple, his fitness band emitted a warning beep.
[Moving during machine use is dangerous. Please remain still.]
Sure enough, the dildo inside him stopped abruptly. Hyeonjun had no choice but to freeze. The moment he did, it resumed. The slow pace made his hips twitch involuntarily—he wanted it harder.
“Hngh… ugh… ah! Ahh… ugh… ah… more… aah! Ugh…”
Fortunately, the dildo’s speed gradually increased. But enduring five minutes of mild stimulation from the warm-up machine was no easy feat for Hyeonjun, who was used to far more intense sex. By the time the machine stopped, he was slumped over, breathless.
[You will now rest for 2 minutes before moving to the next exercise.]
The next instruction was for strength enhancement. The AI explained that stamina was crucial for sex, particularly the strength of the thighs for better grip and control. The next machine Hyeonjun was directed to was a stationary bike. Several were lined up, and one was already occupied by a man mid-workout. Like the others, this machine had a massive dildo installed where the seat should be—meaning the man currently pedaling had one buried deep inside him. He was far taller and more muscular than Jihun, wearing some kind of simulation goggles as he pedaled furiously. His abs and thigh muscles rippled with each movement.
“Huu… huff… hngh…”
The man was so focused on pedaling that he didn’t even notice Hyeonjun watching. He gritted his teeth, suppressing his moans as he exercised. Sweat dripped down his plump, developed chest, and the ring piercing on his swollen nipple swayed with each drop. His gaze was fixed on the terminal attached to the bike, likely following a virtual simulation. Curious about where he was “riding” so intensely, Hyeonjun glanced at the screen. Surprisingly, it was just an ordinary city bike lane. He couldn’t hear what was playing through the man’s wireless earbuds, but the visuals were entirely mundane.
[3 minutes of rest time have passed. Please get on the machine.]
The fitness band beeped in warning. Only then did Hyeonjun put a condom on the machine’s dildo.
“Kngh… ugh… ughngh…”
This one was much larger than the warm-up machine’s. The bike seat wasn’t wide, so it penetrated deeper. He barely managed to place his feet on the pedals before putting on the semi-transparent goggles and turning on the power. A bright blue screen filled his vision.
[Beginning in Novice Mode.]
The fitness band helpfully suggested which mode to select. Once Novice Mode activated, a screen similar to the man’s appeared—a quiet park.
[Duration: 15 minutes.]
At the prompt, Hyeonjun began pedaling. The dildo inside him surged upward with each movement. He grimaced and gripped the handles tightly. Every pedal press made the dildo piston in and out. The screen showed a peaceful park, complete with the sound of flowing water, footsteps, and birds chirping—perfectly replicated. It felt like he was riding a dildo-equipped bike naked in public.
“Ughngh… ah… hngh… eugh…”
If he didn’t pedal properly, the screen wobbled as if the bike might tip over. Hyeonjun clenched the handles and tensed his body to keep balance. The bike kept moving, so the dildo never stopped pounding his ass. The pressure made his inner walls feel scraped raw.
“Hngh… ha… ugh…”
Now he understood why the man beside him had been suppressing his sounds. Though he tried to remind himself it was just a gym simulation, the immersive screen and sounds kept distracting him. The dildo’s relentless thrusting against his pleasure spots didn’t help. His body heated up. If his foot slipped or he pedaled too hard, the dildo thudded against his inner walls. He couldn’t even moan—if he shook, the screen would tilt, and he couldn’t stop.
“Hngh! Ah… ugh… ngh… huu… ah…”
Before he knew it, Hyeonjun was rigidly hard as he pedaled. Every time someone passed by on-screen, he flinched. He’d had outdoor play before, but always under hypnosis. Being completely exposed while fully conscious was far harder to endure.
He’d thought hypnosis had dulled his shame, but the reality was far more embarrassing—and far more arousing.
“Ugh… ah! Ahh!”
Unable to hold back, Hyeonjun came. The condom filled with milky fluid. Panting heavily, he slumped against the handles. On-screen, his bike had crashed long ago. The fitness band calmly announced:
[You have ejaculated, Hyeonjun. This will be reflected in your workout results. Excessive ejaculation can strain the body—please be cautious.]
Author: Hyacinthus B
Hyacinthus
