Yuzuki, a virgin who studied with videos and books in order to have a girlfriend for the first time and succeed in her first sex. Then J ●'s younger sister asked me, "Do you want to practice with me?" ? The lecture escalates more and more though she is overwhelmed and taught about kissing. She loses her reason to her grown-up sister's body, and develops into forbidden brother-sister SEX without hesitation in sucking raw pussy...!
