Kaori, who lives happily with her husband and son, has been intimate with her husband. However, her husband isn't as strong as he used to be, and their sessions end quickly. Kaori has been enduring this dissatisfaction through masturbation. One day, her son inquired about her relationship with her husband. He knew that Kaori enjoys being thrust hard and was aware of the recent decrease in their sexual activity. Teasing Kaori, her son said, "If you're not satisfied with your father anymore, why don't we do it?" and then embraced her...