The innocent mother Aoi and her son have always had a casual relationship, talking about anything and everything like friends. However, now that the son is a university student, he begins to feel bothered by his mother's excessive physical affection. One day, the timid Aoi indulges in her son's desire and sleeps with him. The son becomes aroused by his mother sleeping next to him, so he opens her breasts and strokes his penis. Aoi notices this. The son feels awkward, but he can't hold back any longer! He jumps on top of Aoi and forcibly has sex with her. From that day on, Aoi becomes addicted to her son's penis...