In the dim light of his quarters, the muscular marine strips down to his tight, white underwear, his cock straining against the fabric. He begins to stroke himself, his hand moving up and down his thick shaft, his breath becoming ragged as he picks up the pace. The room fills with the sound of his hand slapping against his cock, the scent of his sweat and precum heavy in the air. He's a soldier, used to discipline, but now he's lost in the pleasure of his own touch.