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The interest in the masochist's propensity to be tied up by drowning in pleasure turns into desire! "One Day, I Witnessed My Mother And Father-In-Law's SM Sex, And I Didn't Want To Peek In. When I See My Mother's Tied Up Ecstatic Expression, I Feel A Strange Excitement And Masturbate. From My Father-In-Law While My Mother Was Away. She gets scolded and punished for peeping in. With that as a trigger, the training progresses, and Mai falls into a rope slave..."