Best Friends Daughter

Since highschool i have a best friend. We always hang out together, he was best man on my wedding, i was on his. Our wifes are friends to, we have gone on vacations with the 4 of us often.
We got kids about the same period, we got 2 boys, they got a boy and a girl.
Since i didn't have a girl but we were all so close, i treated her as my own.
Maybe spoiled her a bit to much with presents on birthdays, christmas and all.

Me and my friend live some blocks from each other, visiting regular.
We have a pool in our garden, they don't, so when temperature rises they are more at our place, having fun, swimming, eating and drinking.

I watched his daughter grow up from baby, lil girl, big girl and now she is a teen.
And i saw the bathing suits change from suits to 2 pieces, showing her curves since she got them. I never thought much of it, she was just almost my own daughter.
But then, about 2 years ago, i saw my boys watching her, getting hardons in their swimming trunks. And i watched her not with daddy eyes, but with male eyes. And things changed...

During some of the parties at our home, she would just sit in my lap.
And i just couldn't remember.. did she always wiggle like that? making me hard?
Did she always hug me like that, pressing her nice small breasts against me?
Did she always look at me during dinner, with those beautiful eyes?
After diner we did some dancing at the music. Did she always was that sexy dancer?
I can say i became kind of aroused when she was around....

On the other side my friend and i talked. He was having difficulties with her growing up.
Since puberty, they did have some arguments turning into fights (not physical, just words).
Doors would be smashed, things thrown (not to hit, just to throw).
He didn't know what to do, maybe it was good if she could stay with us for a week or 2.
Off course we did, to help them. But i wasn't sure it is was a good idea, her around our house, with me and the boys watching her with our dirty eyes.

During those 2 weeks we all got a few horny moments. She only brought some skirts, dresses, so her cute legs were always visible. She didn't always close her legs when watching tv, so it gave an opportunity to watch up her legs. She showered and would come out in only a shirt, partly clinging to her body. And her in 2piece next to the pool, i loved to watch. My wife told me she noticed the trunks of our boys would have more cum stains due to jerking off and that she noticed this girls did some good teasing to them.
Little did she know that it wasn't only my boys that got extra horny...

The last weekend she would be with us, my wife would take the boys to their sports on saturday morning. I would be home to do some chores. Me and her alone around the house.
That saturday morning things started normally. breakfast in a hurry, getting my kids to get their gear and then my wife left.
She asked me what i was going to do and if she could be at the pool.
I had some roof work to do and from the roof i could see her and she could see me.
She smiled.. does it look good up the roof?
It looks good, i'm almost done and it will look better.
Some moments later she called again, if things looked better.
I looked at her.. her top was off... and she asked again, if things looked better.
Off course i said things looked way better and it was almost done.
I had to do some more cleanup but couldn't keep from watching.
Her hands moved on her body, her tits, while looking at me.
When you are done there, she asked, will you come (waiting).. down?
And her hands moved down, in her panties, clear to what she was doing.
Sure i will, i said.. watching her. I cleaned up quickly and came down to her.
She had pulled her panties off to, showing me what her fingers were doing.
(We have a secluded garden, so no one was able to see)
That cute girl, masturbating hard, for me to see, was a major turn on.
I know i should have stopped her, not watched her, but i didn't.
I watched as she came, her body twisting and soft moans.
I watched as she got up. I watched as she pulled my shorts down.
I watched as she started to suck my dick.
Then i snapped out of it. Said we shouldn't do this.
She moved, back on the tanning bed, spreading her legs.
Are you sure? don't you want this? I want you to.
You can fuck me, please?
And again.. i watched. I watched how i stepped forward.
I watched as she took my dick in her hand an guided me.
I watched as one hand grabbed her boobies as my hips started to thrust.
She pulled me closer and we kissed as i fucked her.
Moving faster as she moaned to fuck me faster.
Moving faster as she urged me to cum inside her.
Slamming into her as she said it was her revenge to her dad, fucking his best friend.
And when she said that, i exploded inside her, i couldn't resist.
She started kissing me, telling me how good it was, better then boys her age.
That she did love me, loved me for what she'd done.
I told her we could never tell anyone, never. She said she wouldn't.
She asked if i wanted to touch her again. I did, everywhere.
I licked her to another orgasm, then she sucked me off.
And we plunged in the pool, getting dressed after.
Never spoke of it again.

Fortunately nothing changed between me, her and my friend.
I saw her grow up into a young woman. A married woman, a mother.
She still visits sometimes. Her kids are like my grandchildren.
Just like my grandchildren are almost my friends...