A married woman decides to help out at a mobile massage parlor started by an acquaintance of her husband. However, the customer she receives is a customer in cahoots with her husband, who has a cuckold fetish. The customer demands sexual services from the married woman, who is performing the service with unfamiliar hands. Unable to resist, the customer's hand reaches for her crotch as she gives him a handjob. The sense of immorality of being touched by a man other than her husband intensifies her excitement, and before long her resistance is overwhelmed by the pleasure and she even accepts penetration.