``What are you doing!'' Saki was confused when her son Yuta pressed her. Yuta peeks into Saki's masturbation and becomes excited. He offered to comfort her if she was lonely. That can't be allowed. As her mother, Saki tries to stop Yuta's rampage. However, her extremely frustrated body reacts to her passionate caress... Her mother's rationality? Is it a woman's instinct? between the two