The scent of masculine musk fills the air as a lone man indulges in his private pleasure. His scrotum tightens, pulling his balls up as he vigorously works his cock. The sensation is intense, a symphony of sensations building to a crescendo. His asshole responds in kind, clenching and releasing in time with his balls, as if beckoning his cum to make its way up from his depths. With a final, powerful stroke, he sends his load shooting out, his body convulsing with the force of his solitary release.