Recently, her husband has been away from home a lot, and seeing her son's grown-up behavior makes Ikumi feel like a man, leading her to daydream about having sex with him... One day, Ikumi takes away a pornographic magazine her son has been secretly looking at, and starts masturbating behind her son's back. Her son confesses that he has been daydreaming about sex while enjoying the pleasure of looking at Ikumi's body against the pornographic magazine, and forcefully caresses her body. Unable to resist, Ikumi accepts the caresses, and they end up having a physical relationship... From that day on, mother and son stopped holding back their fantasies and sexual desires, and enjoyed sex every day without any worries.