I have a twin sister, an older sister 2 years older and a younger brother 4 years young than us twins. WHen my little bro was still in diapers my older sis around 8 or 9 and I went into the room where my sister was changing him and she was just playing with his pecker. She looked at me and told me if I could get a boner yet or touched himself or anyone else. I laughed at her and said of course I can every day. She then told me she knows I do somthin in my room because she can hear it through the wall that sounds like humnping and if us twins were both doing it since we have bunk beds. I told her she was wrong and that was the end of it. That night I was in the shower and my older sis came in and took a pee. She opened the shower curtain and told me to show her. She opend her legs and seen her vagina when she whiped it and then she stood up and said "whos is nicer mine or my twin sis's".

I told her I like my other sisters more it didnt' have hair like hers does in front of me. She just had a small bit but not much. I got dressed and she took me to my room and said she had a present to show me. pulled back my bottom sheet and she made a hole in my mattress and said there now instead of humping the pillows put your dick in there and she put a sandwich with the bottom cut off in the whole and put lotion in it and said to do that. She learnt it from her friend who caught her brother doing that. My mattress was thin she said so its perfect.

That night I waited till i thought my sister on the top bunk was asleep then gave it a go. It felt so amazing I couldn't help it and got so into it and didn't realize the noise I was making from the squeeking of the bed. I've had orgasms before but nothing ever came out until that night.

The next morning she she came up behind me when i was brushing my teeth and she pinched my bum and told me she heard me through the wall and asked if I had a orgasm. I told her that stuff came out this time. She explained to me about sperm and that she's never seen it before just learned about it at school. She made me a deal that she would let me look and touch her everywhere I wanted if she could watch me use the hole and see the sperm.

the 3 of us get home together off the bus before mom is home from work and our baby bro is at my aunties house. We are supposed to do our homework first thing at the kitchen table and while we were my older sis tapped my leg and said I need to talk to you come here and we went to my room leaving my twin at the table. She pulled down my pants and underwear and started to rub my penis and told me we had to hurry so she will help me get a boner quicker. It was pretty much instant and then she pulled my skin back and sucked on the end of my penis. She told me thats what she thinks about when she touches her pussy to at night when listening to me hump my pillow. I Jumped on my bed put a new bag in the hole with lotion then put my dick. She laid under the bed and I could feel her mouth ever time i pushed down.

My twin sister flings the door open and asked what the heck was going on and why were we both naked. I didn't realize she took her clothes off under the bed. She told her to come over and lay beside her. I was just laying there still with my penis out the bottom and She was askin her if she's seen his penis before. She told me to keep going and told my sister to watch what happens. It took me like 20 seconds and then i felt a mouth on it and my older sister crawled out from the bed. I was so tingly i had to get up and I looked at them both and it was all over both of their faces.

It became our thing almost every day and we tried different things. I could keep going on but there is too much to this experience.