Yumi lives happily with her husband and daughter. However, when she is having sex with her husband and comforting herself, Yuma, her son-in-law, is making fun of her... Yumi felt sorry for him because of his too big cock. She tells him, ``It's for the both of us,'' and seduces him no matter where he is. Her mother-in-law's lewdness approaches her all the time.