Eriko always had intense sexual desires, but recently she began noticing her husband's declining stamina day by day. Unfulfilled and growing increasingly frustrated, her dissatisfaction mounted. One day, she accidentally caught sight of her son's morning erection and pubic hair, stunned by its size and vigor. Overwhelmed by her insatiable lust, her rationality gave way completely, and she finally started seeing her own son as a new object of desire.