The grunts of exertion echo through the empty gym as the stranger relentlessly pounds the jock's ass. The jock's hole stretches around the thick cock, taking each inch with a mix of pleasure and pain. The stranger, sweat dripping from his body, grips the jock's hips and rams into him, the sound of flesh slapping against flesh filling the room. The jock, now used to the intense pleasure, pushes back against the stranger, matching his rhythm. The stranger reaches around and strokes the jock's big dick, sending him over the edge. The jock's ass clenches around the stranger's cock as he shoots his load, the stranger soon following with a final, deep thrust.