"I do" echoes in the cuckold's mind as he's made to kneel, watching his wife, now a BDSM mistress, command another man to fuck her. She's unbound, unashamed, her body writhing in pleasure as she's taken from behind. The husband's role is clear: observe, endure, and remain hard. He's reduced to a mere spectator, his wife's pleasure now belonging to another, his own needs unmet, his humiliation complete.