NEWM-072 Forbidden sex with my wife's mother, Part 4: I'd rather have a mother-in-law than

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 had been alone for a long time and was frustrated, so she couldn't stop comforting herself. One night, when Mitsuko went to the living room, she found her son-in-law, who was supposed to be sleeping with her daughter upstairs, masturbating. The two of them see this and feel awkward. When I asked him about it, he said that it had been a while since he had spent any night time with his daughter. Mitsuko couldn't help but notice her son-in-law's big bulge and started rubbing it, saying I'd lend a hand...