Maki is a family of three with her husband and son. Until recently, they were a very ordinary family, but since Maki recently learned a special propensity that she can't tell people, that relationship has become a thing of the past. Her propensity is to have sex with her son Takashi even though her husband is right next to her. Being pushed up by her son while suppressing her voice becomes her supreme pleasure for her Maki.
