It has been a year since Shizuka married her older husband, but their relationship has grown cold. Her stepson ignores her, leaving her feeling lonely and isolated. One day, she catches sight of her stepson—youthful, strong, and possessing a lush, tempting physique. Overcome with uncontrollable desire, she uses the pretense of improving their relationship to seduce him. Thus begins the forbidden affair between stepmother and stepson. Using her voluptuous body to her advantage, Shizuka begins milking her stepson's seed day after day.