Unseen hands, perhaps the viewer's own, trace the outline of a stiff cock through denim. The zipper is pulled down, the cock springing free, hard and wanting. It's stroked, caressed, teased until it's slick with pre-cum. The unseen hands grip tighter, moving faster, the cock throbbing in response. The body tenses, the muscles clench, and with a final stroke, cum erupts, painting the unseen hands with its warm, sticky evidence.