Even after their children had grown up, Rieko and her husband remained close. To their son, his mother was envied by friends for being young and attractive. One day, the son caught a glimpse of Rieko and his father having sex, which aroused him. That night, while his father was out, the son approached Rieko and said, "I saw you having sex with Dad and it turned me on." He then lunged at her. Rieko tried to escape desperately, but she was no match for her grown son and ended up being raped. Worse yet, she felt pleasure from her son's cock...
