Living alone with her son, Kyoko one day calls in a masseur after seeing a massage parlor flyer. The man who arrives is the lustful therapist Masao Onose. Captivated by his erotic techniques, Kyoko—a voluptuous milf with big tits and a big ass—undergoes a full-body oil massage that quickly turns into intense sensual therapy. As his skillful fingers tease her into ecstasy, she writhes in pleasure before being impaled on his thick cock, climaxing repeatedly. Experiencing a sexual awakening, Kyoko soon finds herself unable to resist and begins touching her own son intimately.