After 15 years of marriage, her relationship with her husband has cooled, and Uno feels like she is wasting her ripe body every day. At that time, her nephew Yuki comes to Tokyo to take an exam... Yuki has been studying hard for the exam, abstaining from masturbation for a year, but his resolve crumbles when he sees Uno's voluptuous body, causing his crotch to swell violently. Uno happens to see this and has no choice but to jerk him off... Yuki's cock is hard as a reaction to his life of abstinence, and as she repeatedly handles it, her body begins to ache violently...