Natsu is a housewife who has been married for five years, but is dissatisfied with her sex life with her husband. She goes back to her husband's parents' house for a few days, but her father-in-law sees her having fun at a chat lady job she started as a joke. Her father-in-law realizes that she is sexually frustrated, and he makes her climax multiple times with his clingy caresses and a cock that is harder than her husband's. And so their intense and intimate courtship continues...