As a college student, I was invited to her house for the first time in my life and introduced my sister Eimi-chan. At first glance, Eimi-chan, who seems to be sober and serious, seems to be shy and reads a book with few words. She said she would serve home cooking, so when I was looking forward to it, Eimi suddenly appeared and put her body in close contact and said, “Have you ever had sex?”, Whispering in my ear and slipping my hand into my crotch. It was. And she began to show her nasty nature while calling out obscene words with a smile as if to play with me.