Enclosed in a chastity cage, slave P's cock and balls ache for release. Mistress M, a bisexual domina, takes pity, but only to torment. She teases his ass with her fingers and a dildo, then secures him to a sex machine. P's cock, freed from its cage, bobs and weeps as the machine's relentless fucking drives him to the brink. Miss M, watching his every reaction, controls the pace, edging him until he's a quivering, begging mess. Finally, she allows him his release, and P cums hard, his anal-whore status forever cemented.