Rika was sexually frustrated. The reason was that her husband, Naoya, was too busy to take care of her. One day, Rika witnessed the powerful penis of Naoya's father, Masao, who lives with her, and her reason collapsed. Instinctively, Rika began to show off her proud breasts to Masao and seduce him. Masao, who has an extraordinary sexual prowess, fought back, and an unprecedented battle to make each other cum was underway!