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A mother who is always overbearing, nagging and strict, "The Educational Mom". However, this mother is also a nasty masturbation maniac! Her son witnesses her masturbating with a vibrator in her mouth while using an electric massager! The mother, who has been caught in a weak spot, does as her son tells her and they watch each other masturbate! And finally, unable to hold back, she promises to only do it once, and has a one-time raw insertion, which brings her to a demonic climax that is even more intense than masturbation! She thought this was the end, but... on the night her father went on a business trip, the mother, who couldn't forget his dick, raped her son in the night...