Penny Barber, the raven-haired vixen in a white coat, presides over a therapy session that's anything but typical. She coaxes Alex and Sophia, her American and Aussie patients, to confront their forbidden desires. As she imparts her wisdom, their hands wander, exploring each other's curves with newfound confidence. Dr. Barber watches, her own arousal evident, as the siblings succumb to their taboo urges. The room echoes with their moans as they lose themselves in a whirlwind of passion, their bodies slick with sweat and desire, their inhibitions left in a crumpled heap on the floor.