A shadow peeks into the bedroom of a couple working late at night. - Sumire married her husband and felt happy every day. - In contrast to her husband, who was growing older and getting weaker at night, she felt a hunger for sex. - Meanwhile, I ended up living with my father-in-law. - Sumire thought that her father-in-law was kind and they got along well, but she was worried about the way she sometimes looked at him. - And in the evening, the couple's activities for the first time in a while. - Sumire is no match for her husband, who ends up with just a little bit of force. - Her father-in-law sees her. - During the day when her husband wasn't around, her father-in-law hugged her and offered her a hot piston, and the piston that didn't stop even after Sumire came, filled her with a pleasure she had never felt before with her husband. - From that day on, when Sumire confirmed that her husband was asleep, she began to go to her father-in-law to receive pleasure...