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Rieko was living alone after her husband passed away. Then, after two years, her daughter and son-in-law returned home and said they would be staying for a while. The daughter and son-in-law lived happily together, but the son-in-law was dissatisfied with their lack of sex life. One night, when the son-in-law went to the bathroom, he heard a voice on the way. He looked in and found Rieko masturbating. Excited, the son-in-law tried to get his wife to have sex with him. However, she refused, saying it was too early for them to have children, and his frustration only grew. The next day, while the wife was sleeping, the son-in-law attacked Rieko. "You want this too, don't you, Mom?" she resisted, but gradually she began to accept it...