Natsuko lives with her husband and son. Her husband and son are busy, so Natsuko spends lonely days. She tries to cope with this loneliness through masturbation. Her son accidentally sees his mother's masturbation in the kitchen. One weekend, her husband and son go out. Natsuko is tired from housework and falls asleep in the living room. Her son finishes work early and comes home. He is attracted to his sleeping mother's ass and starts jerking off. Natsuko feels something strange and wakes up. The surprised son accidentally ejaculates. 'I only get excited with mom,' her excited son attacks her, and she ends up giving in to him...
