Chika and his wife had been married for 10 years, had a son in elementary school, and had a happy family, with no complaints except for one thing. - Actually, one point was that my husband was indifferent to sex and ejaculated prematurely. - As a result of this, Chika began to masturbate more frequently and her sexual desire became stronger as she got older. - One day, his classmate Saito, who is famous for being a dick, came to visit for advice. - By the way, my husband, Chika, and Saito were classmates from their school days. - During the consultation, her husband has some urgent work to attend to, leaving Chika and Saito alone. - Then, Saito forcibly approached Chika, and Chika really didn't like it at first, but for the first time in her life, she was touched by a man other than her husband, and the excitement and sense of immorality she felt was indescribably pleasurable. - He forgives her, but Chika's body is affected by his SEX techniques...