Is it fate or luck? A son ends up watching his favorite adult video with his mother. The son gets an erection whether he likes it or not. The mother becomes restless as she watches the AV screen and sees the son's erection. Her maternal instinct overcomes her rationality and she asks, "Don't you want to have sex now?" While telling herself that it's for her son's sake, the mother crosses the line. "My mother has now become a woman."