Rieko lives with her husband and her daughter and son-in-law. The other day, her daughter told her she was pregnant, and she couldn't help but be happy. Moreover, the baby was a boy, and Rieko, who only has a daughter, was looking forward to the birth of a grandchild. One day, while having a drink, her daughter told her that she could still give birth, so she should try. Rieko thought that might be a good idea. That night, she invited her husband to have sex and said that she wanted a boy, but he didn't hold her. The next day, when her husband and daughter went to a checkup, her son-in-law asked her if she was serious about wanting a boy. Rieko was upset, but she said that she would like one if possible. Then her son-in-law hugged her and asked if he was okay with him. Rieko was confused, but her body reacted automatically when her son-in-law caressed her. The son-in-law's penis was harder and more erect than her husband's, and although she said no with her mouth, she stroked it with dirty hands and tasted it with the tip of her tongue. When the son-in-law spreads Rieko's legs and tries to insert, Rieko tries to refuse, but when the son-in-law says maliciously, "Are you going to stop me after coming this far?", Rieko, who really wants it so badly, calls him mean and guides the son-in-law's rod into her herself...