Penny Barber, a devoted religious woman, is torn between her faith and her carnal desires as she participates in a disturbing therapy session with her step-son, Franco Styles, and the seductive therapist, Lilly James. The cramped therapy room becomes a den of sin as Penny, her modest clothing discarded, is encouraged to engage in a lewd threesome to "cure" Franco's supposed affliction. Penny, her eyes filled with religious guilt and lust, service both Franco's thick cock and Lilly's hungry pussy with her mouth and fingers, all while Lilly's big tits press against her. The room fills with the sound of wet flesh and moans as they all race towards their explosive, taboo climaxes.