A couple visits a bridal spa because the girlfriend wants to look perfect before their wedding, but both are served tea laced with aphrodisiacs before treatment begins. Once the drugs take effect, the male and female therapists switch clients and turn the massage increasingly sexual. The girlfriend is embarrassed in front of the male therapist, yet the aphrodisiac leaves her overwhelmed with pleasure and unable to resist. Her boyfriend is forced to watch through a one-way mirror, but the busty female therapist's expert touch soon gets him hard as well. Consumed by pleasure, both partners secretly have unprotected sex with their respective therapists at the same time, each believing they are betraying the other unseen.