Locked：04
My name is Kevin, a senior, and I've been a part-time gym trainer for a year and a half.
On the surface, I'm that "pro guy" with a deep voice, standard form, always spotting who's got bad posture.
But deep down, I never thought I'd fall this hard.
The first time I noticed Acheng and Alin was on a Friday evening.
Acheng was squatting in front of the mirror; his dark gray compression pants were too tight, and that pink little bulge underneath looked like it was showing off on purpose.
I glanced over as I passed, thinking it was a protective cup, but when he squatted, the fabric stretched tight and the shadow of the front bars was clearly visible, plus a spreading wet spot—not sweat, but that sticky precum trace.
My mind heated up right then; I pretended not to see and kept coaching others, but my eyes kept drifting over there.
Later he straight-up admitted to the freshman Xiaoyu next to him, "It's a chastity lock, the key's not in my hands."
I stood not far away, water bottle in hand, knuckles turning white.
In that moment I wasn't shocked, but… a possessiveness I'd never felt before.
I thought: these two seniors, locked up in my gym, being touched and stared at by others, yet no one dares to really take them.
I wanted to be the one who "dares."
From that day on, I started deliberately circling them more during their workouts.
They quickly noticed too.
Once while Alin was doing deadlifts, I walked over to "correct" his form and my hand "accidentally" brushed the front of his silver-black cage.
He didn't dodge; instead he said softly, "Coach… want to feel it more clearly?"
My fingers traced along the bar lines; the metal was cold, but inside it was burning hot, and precum had already soaked through the pants.
He let out a muffled groan, knees buckling slightly.
My heart raced so fast I could hear it in my ears, but I forced calm: "Whose hand is the key in?"
Acheng walked over, took off the pink key and handed it to me: "You're in charge of him today. Play however you want."
From that day everything spiraled out of control.
After lights-out, only the three of us remained in the gym. I had them kneel side by side on yoga mats.
Two pairs of compression pants pulled down to their knees, two cages facing me: one small and cute pink, one hard and domineering silver-black.'
I first tapped Acheng's front lightly with the key, listening to the metal clinks and his gasps; then tapped Alin's, hearing the suppressed growl in his throat.
They looked at each other, eyes full of excitement, as if saying: look, we've been played with by someone else again.
I had them turn around, asses raised high.
The first time I took their back doors was that day.
I first coated my fingers with lube and slowly worked into Acheng.
He clenched tight at first, panting, "Coach… gently."
But I didn't stop; my other hand gripped the front of his cage and rubbed, forcing him to relax.
Once his hole adapted, I added a second finger, slowly thrusting.
He soon went soft, waist collapsing, letting out broken moans.
"…so deep… coach… a little deeper inside…"
Alin watched from the side, his own cage swelling even more, leaking down his thighs.
When I turned to work on him, he was even more sensitive than Acheng; the moment I pushed in he trembled all over, ass unconsciously pushing back.
"Fuck… coach… I'm gonna break…"
I had them lie side by side, both holes played with by my fingers at once while I took turns rubbing their cage fronts.
They reached the edge together but couldn't cum, only leaking messily, soaking a huge patch on the mat.
That night they were in heaven, legs too weak to stand. I hung the key around my own neck and said, "From today on, both your back doors are mine to manage."
Xiaoyu, that freshman in the black T-shirt, was soon pulled in too.
He'd only been peeking at first; after Acheng deliberately lured him and he got to touch the cages a few times, he became hopelessly addicted.
One day after training I called him into a corner of the equipment room.
"Want to be in charge of them for a day?"-
His eyes lit up, but I handed him the spare key I'd made myself.
Condition: he had to be locked too.
He hesitated two seconds, then nodded.
Right there I locked him into a beginner black plastic cage I'd prepared in advance, clicking it shut.
From that day Xiaoyu became the third lock slave.
He came to train wearing the lock, deliberately showing the outline in tight pants, copying Acheng and Alin by squatting and deadlifting, letting the wet spots spread.
I had the three of them kneel side by side in the storage room, three cages lined up: pink, silver-black, black.
I took turns playing with their back doors using fingers, toys, even making them lick each other's holes.
Xiaoyu was the most sensitive; the moment he was penetrated he'd cry and beg, yet push his ass higher.
Acheng and Alin watched him being opened, eyes full of excitement, as if saying: look, the new one has fallen too.
The three of them came so hard their legs shook, licking each other's leaked fluids clean, then looked up at me in unison: "Coach… you come too."
I froze.
They started coaxing me in return.
Acheng took off the pink key and hung it around my neck: "Coach, you've been managing us so long, you should taste what it's like to be managed."
Alin grinned lewdly: "All three of us will serve you together, guarantee you'll be in heaven."
Xiaoyu added with a red face: "Coach… you're already this hard down there, why pretend?"
I meant to refuse, but the three of them knelt at once, three cages pressed in front of me, three asses raised waiting.
My mind went hot and I heard myself say, "…Put it on me."
Their movements were frighteningly practiced.
Acheng licked me wet first, then slowly fitted a custom titanium cage they'd prepared long ago—silver-gray, one size bigger than Alin's—clicking it locked.
The moment it locked I felt my legs go weak.
They pressed me onto the mat and took turns playing with my back door.
Acheng's fingers were the gentlest yet deepest; Alin the roughest, hitting the prostate straight on; Xiaoyu the best at licking, tongue tip drilling in.
I was brought to the edge but couldn't cum, only leaking everywhere.
The three of them chuckled together: "Coach… now the four of us are in this together."
From that day the gym after lights-out became our private hell-heaven.
Four lock slaves, four cages, four keys passed around in turns.
We opened each other's back doors, licked each other's cages, leaked inside our compression pants and showed each other.
I went from "master" to "one of them," yet never felt this good.
Every time I saw the three of them with asses raised waiting for me to fuck, cages swaying, wet spots spreading, I'd think:
Fuck, so this feeling of being locked, controlled, back door played with… is this fucking addictive.
Now whenever the four of us go out, it's compression pants + bulging outline + wet spots.
People in the gym started whispering, but no one dared ask.
We exchanged glances, as if saying:
Look, they all know.
Look, all four of us are locked.
Look, none of us can escape.
And I, already have no desire to escape at all.
End。