My little sister is getting cuter and cuter, and it's driving me crazy. I used to think of her as a kid, but now that she's in high school, she's incredibly cute, and her chest is starting to develop—I can't take it as a virgin!!! To make matters worse, my kind-hearted, brother-loving sister knows that I'm desperate to do something perverted and says, 'If you feel like doing something perverted, you can use my body anytime, big brother. It'll be practice for me too…'! So I took her up on her offer...
