「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門家庭教師に!?ネガティブ過ぎる童貞のボクには、明るくて優しいヤリマンの妹がいます。このままずっと童貞で何も良い事なんてない、と落ち込んでいると、そんなボクを見かねた妹から…
"Big brother! I'll teach you naughty things just for today!" My slutty little sister is my personal tutor specializing in sex!? I'm a virgin with a negative attitude, but I have a cheerful and kind slutty little sister. When I was feeling down thinking that there was nothing good about being a virgin forever, my little sister couldn't bear to see me like that...