Mitsuko's daughter had gotten married and left home, but since both of them worked and housework was difficult, Mitsuko and her daughter decided to live together. Mitsuko has been alone for a long time and her frustration has built up and she can't stop comforting herself. One night, when Mitsuko went to her living room, her son-in-law, who was supposed to be sleeping with her daughter on the second floor, was masturbating. The two of them see this and feel awkward. When I talked to her, she said that it had been a while since she had any night time activities with her daughter. Mitsuko couldn't help but notice her son-in-law's big bulge, and she asked me if I could help her...
