Natsuko lives with her husband and son in a stepfamily. Her husband and son are busy, leaving Natsuko feeling lonely and bored. She copes by masturbating. One day, while cleaning the kitchen, she accidentally exposes herself to her curious son peeking through the doorway. That weekend, both her husband and son leave early for work, leaving Natsuko alone at home. Tired from housework, she falls asleep on the couch. When her son returns earlier than expected from his job, he becomes aroused by her sleeping body and begins touching her ass. Startled awake, Natsuko tries to resist but finds herself unable to fight off her horny son...※ Content may vary depending on distribution method.