HUNT-448 At the "staying party" where everyone is supposed to do their homework, the naive girls who happened to see the shocking lewd pictures of the older brother's erotic book that they found can not suppress the urge of the lower body t

A staying party will be held at a friend's house for naive students to do their homework! However, I read my brother's erotic book together with my homework, and I was on the verge of panic in my head because of the nasty content of the erotic book! "Do you really do this when you grow up?" Such worried naive girls consult with their older brother and ask them to solve the mystery of the sex.