How it started with my older sister

I was a boy who loved to hang around everyone. I got into trouble and would always do dares if someone asked me too. I loved the attention as a 5 year old. As I was in preschool my mother would pick me up and my sister from school. I had no idea that year that something with my sister would happen. I had no attraction to my sister at the time. I was just a hyper little boy. But we both got home from school that day. I played with my toys and watched television. She went to her room and listened to some music and my mom was making us some dinner. I know as kids growing up that you can easliy do the wrong thing. I was minding my own buisiness and my mom was watching television and she easliy got distracted which came in handy in the years to come. I walked in to the hallway towards my sisters room and I heard something else instead of just music. I opened the door and what my sister was doing looked so strange to me at the time. She was in her little skirt with her panties down, using her finger on what looked to be the strangest thing I have ever saw. It was very interesting to me as I new hardly anything about girls. Exept breasts at the time. My sister looked shocked to see me. And new that I was going to tell mom what she was doing. But somehow I didnt. She said to me, don’t you know how to knock. I said what are you doing I’m telling mom. And she said yeah right, and got up and shut the door and locked it. I started to cry at the time. She looked at me and said I tell you what I will let you see my vagina if you don’t tell mom. I said whats a vagina? She said it”s what all girls have and boys love them. I said maybe. Then she told me that earlier at school today, her friends had told her about sex, SEX?. She said yes its fun and it feels good. My older sister then sat down beside me and asked me to take off my shirt. I did it willingly. Thinking this was a fun game. Then she said take off your shorts and underwear. I said to sis. My privates will be showing. She said its fine. You saw my pee pee. So lets see yours. She was anxious as she has never seen a penis before. I did it and took off my underwair. revealing my penis to her which at 5 was small. She said why is it not that big and hard. I told her I don’t know. I never knew about the feeling of an orgasm. But I know that I always did like to hump my pillow as a small child, it felt good at the time. My sister said to me can I touch it? Why I thought? She said I want to see it get hard. I said I guess. But I said you have to show me your vagina all the way this time. This was at night kinda as my mom was still watching tv. My sister went to check to make sure my mom would not catch us. She came back and she is 8 years old and took her beauty and the beast panties off and reavealed a beautiful hairless vagina. She was a virgin at the time and she took her fingers and spreaded the tiny lips revealing a strange pink tight layer in her vagina.