The pounding water against his back sets the rhythm as he grips his massive, veiny cock, jerking it with purpose. His other hand reaches down, cupping his heavy balls, rolling them gently as he picks up speed. The steam fills the small space, fogging up the glass door, creating an intimate, private world. His breath becomes ragged, his strokes urgent, as he chases his release. With a final, deep groan, he comes undone, his thick cum splattering against the shower wall, washing away with the water, a secret only he and the shower will ever know.