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... I, Tadashi, 31 years old. ● I am a school teacher. … My wife, Mirei, 36 years old. 6th year of marriage. It's a so-called sister's wife. I decided to tutor my ex-student's ronin with my wife ... Three months have passed and the two ronin exams have been completed. It was about two more months after that. Ronin and wife's unfaithful act ... I saw it as if I were dreaming. The emotions that seemed to make me laugh were swirling because it was too improbable. However, only my cock firmly accepted the reality and had an erection that was impossible ...