Housewife Ren visits a spa recommended by her husband, unaware that its corrupt middle-aged therapist uses women for his own pleasure. He massages her with aphrodisiac-laced oil, making her sweat as his increasingly invasive touches arouse her. She tells him to stop, but her body gives in to the pleasure. Soon she is convulsing, losing bladder control and squirting repeatedly with her eyes crossed and rolled back and her tongue hanging out. After her entire body is trained to respond sexually, she secretly returns again and again, openly chasing more stimulation and screaming through messy orgasms.