Yui lived a peaceful life with her husband. One day, her brother-in-law, Hideo, came to stay at their house while looking for a job. Since her husband rarely initiated sex, and Hideo's presence made it even less likely, Yui had been satisfying her frustrations through masturbation. By chance, Hideo saw her doing this and ended up fucking her. Unlike her husband, Hideo worked in manual labor, and his intense pounding made Yui cum in an instant. However, Hideo's pounding showed no sign of stopping, continuing to torment Yui even after she had just reached climax...