After losing her husband at a young age, Rieko lived with her daughter and son-in-law, Shinji. Though their days were ordinary, they supported each other through strong family bonds. One day, Rieko accidentally witnessed a sexual problem between her daughter and Shinji. Her daughter struggled with sex and couldn't respond to Shinji's advances. Worried, Rieko tried to talk with her daughter, but she refused to listen. Then, by chance, Rieko discovered Shinji masturbating. Overcome with shock and confusion, Rieko took an unexpected step. "My daughter's burden is my responsibility as her mother," she said, reaching out to grasp Shinji's cock. What began as a handjob led to a blowjob, and eventually full intercourse. Though Rieko desperately resisted Shinji's uncontrollable desire, she ultimately gave in to her own feelings.