HUNTA-586 Big brother! I'll teach you something naughty just for today! My slut sister becomes my exclusive sex tutor! ? I'm an overly negative virgin, but I have a bright and kind younger sister who is a slut. When I was feeling depressed and thinking that nothing good would ever happen to me if I remained a virgin, my sister, who couldn't bear to see me like this...

A bright and kind slut sister offers to give a lecture to her overly negative virgin brother as a private tutor specializing in sex, and she studies hard with the tutor (slut sister) in preparation for losing her virginity! But everything he hears and does is too stimulating for a virgin, and he gets fully erect! Then, the younger sister who was supposed to teach him could no longer hold back in front of his erect penis and exposed her true nature as a slut! ! Forcibly inserted