Lily looked at me, waiting to see my reaction. Her pussy was perfect. Small and pink. I felt like I couldn't breath. I was sweating. My sister told me to touch her... I still didn't believe what she had told me. There was no way our Mom had really told her that story. She never had sex with our Uncle, it was crazy to even think about it. Everyone knows that kind of thing never actually happens in real life. This has to be some sort of joke. But... My little sister is sitting in front of me with her legs spread, begging me to touch her. Maybe I'm wrong...