Yoshio, a younger brother who lives with his older brother and his wife, is attracted to his kind-hearted wife Yumi and secretly peeks into their affairs. One day, when Yumi sends her husband on a business trip, Yoshio pretends to be sick and asks her to take care of him. As Yumi gently takes care of Yoshio, Yoshio extends his naughty hands to her... She caresses his body with her plump ass, and they gradually become more and more audacious as they do sumata and 69.