Shizuka, a beautiful stepmother with an outstanding figure and a sensual allure, is unable to suppress her overflowing sexual desires in her prime and repeatedly engages in obscene acts with her stepson Takashi. One day, Takashi's drunk friend Kouji, who is resting at his house, witnesses the father and son engaging in intense sexual acts. Kouji is unable to contain his excitement at her sensual body and lewd appearance, and when he tells her how he feels, the beautiful stepmother, who exposes her carnal desires, sticks out her big ass, takes the cock into her mature pussy, and sweats as she indulges in pleasure.