My plain little sister, who grew up in an all-girls school and has had almost no contact with the opposite sex, is going to a coeducational university. She doesn't want to be embarrassed on her college debut, so she says she wants to practice with me, her older brother. At first, we just talk and hold hands, but when I see her defenseless panties and breasts and our breasts touch, I can't help but get aroused! Then, my little sister's desire to grow up knows no bounds, so I practice my dick on her too! I never thought I'd feel like a woman for my little sister, but I was still rock hard!