Aoyama Aoi is a gentle and loving mother who has always shared a close, open relationship with her son. But now that he's in college, he begins to feel uneasy about his mother's warmth and physical affection. One day, the timid Aoi clings to her son out of fear and suggests they sleep together. Lying beside her, he becomes overwhelmed by her body heat, exposing her breasts and jerking off. Noticing this, Aoi is initially surprised but tries to understand her son's feelings—until she can no longer resist, mounting him and forcefully having sex. From that day on, Aoi becomes completely addicted to her son's cock.