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時折、後ろめたさに手が震えることがある。僕は彼女に決してしてはいけない隠し事をしていた。それは、彼女よりも彼女の母親・さくらさんを好きになってしまったことだ。
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表向きは厳格な教師を演じながらその実、麻友子の本性は教え子とこっそり関係を持って快楽を貪るスケベ女だった。最近は教え子の山田と学校内の死角で事に及びスリルと背徳感を楽しんでいた。だが、その様子をクラスの河谷に目撃されてしまったことで状況は一変する。
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