One day, Yuki heard strange noises coming from her son's room and, curious, peeked inside. There, she saw her son vigorously jerking off his large, erect cock. Tired and emotionally drained from unsatisfying sex with her husband, Yuki found herself increasingly consumed by the sight. Mesmerized by her son's powerful erection, her desire finally reached its limit—and she crossed the line into forbidden intimacy.