両親が留守中、今まで二人きりでも全く気にならなかった見慣れたはずな妹の、いつのまにか大人になった下着姿にソソられ思わず勃起！それが妹にバレて「何勃ってるの？お兄ちゃん童貞なんでしょ」とからかってきたので、ごまかしながら「お前、初体験したのかよ」と聞くと「当たり前でしょ、エッチぐらいたくさんしてるよ」と言ってきてビックリ！そして、「ホントは童貞なんでしょ」と小悪魔的態度で迫ってくる妹に我慢できなくなり、シタことないと白状すると「じゃあ、お兄ちゃんシテも良いよ」と誘ってきた！？そして妹に主導権を握られ、もう無理だと言うほど激ピストンをさせられました！！
While my parents were away, my sister, who should have become accustomed to it, wasn't bothered by herself until now, but she suddenly erected in her underwear that had grown up! That's what my sister told me, "What's going on? You're a virgin, don't you?" I'm surprised to hear that! Then, "I'm really a virgin," I couldn't put up with my sister who was approaching with a small devilish attitude, and when I confessed that there was no shita, I invited you, "Oh, my brother Shit is good!" ? And my sister took the initiative and forced me to do a hard piston to say it was impossible! !
