Back in 1968 when I was 13 I convinced my 9 year old sister to let me fuck her. I fucked her that day and we ended up fucking regularly for almost ten years. When we were younger our parents both worked so we were home alone a lot. We experimented in every possible way we could think of and we fucked a lot. As we got older we tended to have quickies after school or sneak into each others room just before going to sleep. Some of my best memories were when we would fuck after we got home from dates. She would tell me about the guy who fucked her earlier while I was fucking her, or I'd tell her about the girl I fucked while I plowed her pussy