Reiko married into the wealthy founding family of a major corporation, but her work-obsessed husband neglects the family and has lost all interest in sex. In contrast, she finds herself increasingly drawn to her kind adult son Kosuke. Reiko struggles with her forbidden feelings until a letter reveals that Kosuke was switched at birth and is not biologically related to her. The news devastates him, but he has secretly desired Reiko as a woman too. Unable to hold back, they kiss passionately and surrender to repeated breeding sex and creampies. An adult family-role-play fantasy.