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Public health doctor Rui is a beautiful teacher who is popular with students. However, in her private life, she was taught by her masochistic husband to the extent that she would do her husband's anal every night as an S woman. One day at school, a male student who has become interested in anal sex consults me and gently teaches me how to do it. For an extracurricular lesson that is not cool to call the students who are completely absorbed in the house.