HUNT-329 At the "staying party" where everyone is supposed to do their homework, the naive girls who happened to see the shocking lewd pictu

My sister and her friends who had a night out to do their homework. My sisters are excited about the erotic books that my brother had hidden behind his homework, but in reality, he has a lot of hatena in his head! ?? I'm worried about the difference between my older sister in the photo and my undeveloped self, and while asking my brother who is a man directly, the naive girls who are making their crotch moody are enthusiastic about studying naughty things! ??