Hisae, a mother who has had a relationship with her son that is more than just parent and child, has always been strict with her son in front of her husband, so that he doesn't know about it. When her husband is gone, she becomes abnormally overprotective and keeps her son's dick all to herself. In the morning, she kisses him and gives him a blowjob to milk his semen, and when it's time for her son to masturbate, she becomes an erotic model and they masturbate together. They spend time together in the bath and in bed.