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Yuuri, a teacher at a certain boys' school, has been enjoying making men writhe and orgasm through anal sex due to the influence of her perverted and masochistic husband whom she married a few years ago. Every night, she drives her masochistic husband wild with strap-on reverse anal sex. One day, Yuuri's slutty side is stirred by a masochistic male student she meets at school, and she teaches the student the pleasure of anal sex on the bed in the nurse's office, and invites the student to her house, where he becomes addicted to the pleasure of obscene reverse anal sex...