Lately, my sister has been incredibly cute… My brother, who has developed a sexual interest in his sister, really wants to do something lewd with her! When he shows her an erotic book out of mischief, she seems excited. Maybe there's a chance! "Want to have sex with me?" Confused by her brother's perverted remark, the sister's pubescent body is honest. Gradually, the sister also gets in the mood…!?
