Mr. and Mrs. Chika have been married for 10 years, have a child in elementary school, and are a harmonious family with no complaints except for one point.Actually, that one point was that her husband was light on SEX and premature ejaculation.As a result of that, Chika masturbated more frequently as she got older, and her libido grew stronger.One day, her classmate Saito, who is famous for Yarichin, visited her for her consultation.By the way, her husband, Chika, and Saito were classmates when they were students.In the middle of the consultation, her husband has an urgent job and Chika and Saito are alone.Then Saito forcibly approached him, and Chika really hated 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 immorality of it was an indescribable pleasure. I'll forgive you, but Chika's body is... in that sex technique.