Chika and her husband had been married for 10 years, had a son in elementary school, and lived a happy home with no complaints except for one thing. In fact, that one thing was that her husband was indifferent to sex and had premature ejaculation. As a result, Chika masturbated more frequently as she got older, and her libido grew stronger. One day, her classmate Saito, who is famous for being a playboy, came to visit her for advice. By the way, her husband, Chika, and Saito were all classmates from their school days. In the middle of the consultation, Saito's husband had an emergency assignment, leaving Chika and Saito alone. Saito then made advances on her, and Chika really didn't want to at first, but it was the first time in her life that she had been touched by a man other than her husband, and the excitement and sense of guilt were an indescribable pleasure, so she gave in to Saito's advances, thinking that it would only be once, but Chika's body was...