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Yayoi who is always busy with a husband who doesn't have a partner at night. The days that masturbation finished without being continued. The son who had noticed the frustration of such mother also spent the desire restraining. One day, Yayoi fell during cleaning. She was a son who was cared for, but she could not suppress the desire for her mother's glossy body, and finally committed her. Yayoi who felt disagreeable falls into an abnormal adultery that cannot be pulled from this day...