Natsu is a housewife who has been married for five years and is dissatisfied with her sex life with her husband. During a few days' visit to her husband's parents' home, her father-in-law catches her enjoying her side job as a chat lady, which she started for a bit of fun. Realizing her sexual frustration, the father-in-law's sticky caresses and a cock harder than her husband's send Natsu to climax over and over again. And so, the intense and intimate courtship in the middle of summer continues...