Kenichi and his wife Maiko, who have been married for three years, bought an apartment and are living a happy life. At that time, Maiko's older sister Tomoe will stay at their apartment to find a room where she can live alone. Unlike her wife, Kenichi not only has plump and huge breasts, but also wears a highly revealing and defenseless fashion, and is at a loss as to where to look at her. While Tomoe emits her sensual pheromones, she invites him to enjoy her forbidden pleasures as he enjoys his troubled appearance...
