I, a college student, was invited to her house for the first time and was introduced to my sister, Hina-chan. She looks sober and serious Hina-chan is shy and her words are few. And that night, she is tied to her, but Hina-chan, who passed by her in the corridor, suddenly puts her body in close contact with me and whispers in my ear, "I'm more erotic than my sister..." I slipped her hand into her crotch. And she smiled like she was toying with me, and began to show her obscene nature by repeatedly calling out obscene words that I couldn't imagine from her appearance.
