「お兄ちゃん！今日だけエッチな事教えてあげる！」ヤリマンの妹がボク専属のエッチ専门家庭教师に！？ネガティブ过ぎる童贞のボクには、明るくて优しいヤリマンの妹がいます。このままずっと童贞で何も良い事なんてない、と落ち込んでいると、そんなボクを见かねた妹から…

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