My older sister and I shared a room from when I was born until she turned 9. We were a year apart and when I was 5, like many nights we would watch a movie before bed and lay on the floor next to one another. She fell asleep and I was still awake watching the movie, her arm wrapped around me. After a while her hand went to my boxers. I got hard and she started fondling me, I pulled my boxers down and she continued. I slip my hand in her panties and felt a pussy for my first time. She kept stroking me, and then I felt an orgasm for the first time. Her hand had most of my cum on it, she put that hand in her panties and kicked my hand out. I swear she was awake through it all but she was convincing that she was really asleep. It happened about once a week after that, same way everytime, until her birthday. I woke up to her on top of me, this time I acted asleep. When I blew my load in her I mumbled the words "better than I thought" she got scared that I would tell on her. I told her I would keep my mouth shut only if we could play more often and experiment more. She kept that promise until I turned 8. In that time we went from just giving each other orgasms to trying fetishes, my favorite was piss play. I'd wake up needing to pee in the night, I'd roll over getting all snuggled up to her and piss. A few times my parents let her have a friends stay over, one of them was a curious horny brunette. Let's just say she didn't just come for a sleepover with my sis, she liked playing with me a lot. After my sister moved into he own room we didn't play together ever again, but a couple of her friends were wild girls, they'd get drunk and strip naked, sometimes ending up in my room where I'd take advantage of the opportunity.