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While her husband is away on a business trip, Yoko, a mother, lives with her son Satoru in a single-parent household. One day, their nighttime activities have stopped, and she is left feeling sexually frustrated. When she goes into Satoru's room to clean, she finds him in the middle of masturbating... Yoko quickly looks away, but Satoru has always had a desire for his mother as a member of the opposite sex, and takes this opportunity to make advances on Yoko's body. She is unable to refuse his strong demands, and, coupled with her own lack of sex, she says "I'll just give you a blowjob," and sucks her son's stiff, erect cock, but...