Yoshio, the younger brother living in his older brother's house, is drawn to his kind sister-in-law Yumi and secretly watches their marital acts. One day, after sending her husband on a business trip, Yoshio feigns illness to have Yumi take care of him. As Yumi tenderly attends to him, Yoshio reaches out with his lecherous hands… Using her ample buttocks to caress his body, they proceed with frottage and 69, gradually becoming more brazen.
