On Three...

"So on three..." she said.
"OK"
"One"
"Two"
"Three"
We pulled down our underpants at the same time as per our agreement. My already hard cock sprang out and actually slapped my belly. It was bigger than I have even seen it and it was throbbing in sync with my excited heartbeat. I hadn't even grown a pubic hair yet so it seemed so long.
She eyed it and smiled.
I bent over to get a closer look at what she revealed to me. It looked like a tangle of black hair and I couldn't quite make out what was going on down there. As I got closer and I could then smell her wetness as I could now also see her dark red folds of her vagina. She turned and sat on the bed and then she spread her legs open. She then used two fingers to slightly open her pussy to me. " Come over and press it into here"
I did just that. I was surprised at how i slid right into her and she let out a moan of pleasure. It kinda felt like I had to pee but better.
She then said " Lay on top of me and push it all the way in"
I pushed my rod deep as it would go and it felt fantastic! We both moaned a bit as I slid in. Then we just lay there, my balls being tickled by her bush, holding my cock in place.I used to make my boners bounce up and down, what I now know as a kagel, sometimes when they would pop up. So I did that because it seemed natural and we both kinda laughed at the feeling it brought to us.
Then we heard the garage door open.
Our father was home.