In the bustling gym, a muscular jock twink, wearing only a sports bra and tiny shorts, catches his reflection in the mirror. His cock twitches, hardening at the sight. He checks around, then starts a slow, stealthy stroke. His big, veiny cock tents his shorts, drawing attention. He slips into a side room, locking the door. He strips, revealing his massive, uncut cock. He jerks off vigorously, moaning loudly, "Fuck, bro, I can't hold it," before cumming hard, coating the mirror with his seed.