Perhaps I should explain that Elizabeth is 10 years old and is the best friend of my daughter Amber, who is also 10.

Both girls are about 5'0", but whereas Elizabeth is a straight haired brunette with shoulder length hair and titties that are just little buds, Amber is a curly haired red head and is totally flat-chested as most 10 year old are. Actually Amber looks just like 'Annie' in that movie.

Elizabeth's mother, Sara, is a close friend of my wife Jackie, and they spend hours together, always out shopping and doing other girlie things, usually leaving me to 'baby-sit' the two girls.

In the whole of the five years that they have lived near, and been friends with us, I have never seen any sign of Elizabeth's father, and Elizabeth, or 'Liz' as she prefers to be called, has never mentioned him.

She started playing with Amber when they were both about 5, and I always assumed that, as I became the man in her life, this explained the affection she always showed towards me.

From those very early days she always used to jump on my lap and hug me, telling me in her little girl way that she loved me.

In the beginning I noticed that this seemed to upset Amber, so tried to share my time equally between them.

I explained to Amber, that as Liz had no daddy, she was just borrowing me, and Amber happily accepted this as, after all, she and Liz ARE best friends.

As they grew older, they both accepted the situation, and became more like sisters to each other.

Often they would both sit on my lap, one on each leg, their bodies laid up mine.

I would have the delightful pleasure of one head on each of my shoulders, whilst we watched a movie on TV.

At this point in time I thought nothing of it, and certainly NEVER entertained any sexual thoughts about either of them.

It was just a nice relationship.

Sara always used to say that Liz adored being with me, and that I seemed to bring out the best in her, as she was NEVER any trouble when she was with me, unlike when she was at home.

They didn't seem to have a very loving or understanding relationship.

I suppose I should have had inkling that Liz had other ideas that day, when she was about 9 and came running into my bedroom where I was getting changed.

"Uncle Pete" she cried, not seeming to notice that I had no pants on.

"I've got a pain in my tummy," she added, lifting her loose gingham dress up as she spoke.

This revealed her lovely round belly, her lower halve encased in a pair of tight white panties.

Although I had had many 'accidental' panty flashes from both her and my daughter over the years, this was the first time she had deliberately exposed herself to me.

Unexpectedly, my cock lurched at this adorable sight, but fortunately for me, I was wearing a baggy pair of boxers that hid my erection from her gaze.

"Please rub it better," she whined, thrusting her belly towards me.

I gently rubbed her stomach, and for the first time actually enjoyed the feel of her soft flesh on my hand.

"Lower," she said, pushing my hand down towards the top of her panties.

I suddenly came to my senses.

What on earth was I doing?

There was I, stood without my trousers, my hand almost in the top of her panties.

What would my wife or Sara say if they came in and caught us?

Although it was perfectly innocent, it didn't look it, particularly as I was sporting a big boner, a fact that an adult wouldn't miss.

"No, you'd better tell your mum, so she can give you some medicine or something," I said, realizing that it sounded a lame excuse.

Liz huffed, tossed her head, then turned and left the room as quickly as she had entered it.

I suppose that I should have realized that Liz was getting more sexual towards me, by the way she always ground her gorgeous little bubble butt on my crotch every time she sat on my lap.

I suppose that I should have realized, by the number of times she 'accidentally' put her hand on my cock whenever she pushed herself off my lap.

I suppose I was too naive, still regarding her as the little girl she had always been, although looking back on those events, I now realize that her attitude to me was totally different to the way Amber was with me.

Both were very loving towards me but, whilst Amber showed the true unconditional love that exists between father and daughter, Liz was far, far more overtly sexual.

I think I started to realize that Liz had a crush on me, the day that Jackie took Amber to the orthodontist for her regular check up.

I was in the house on my own, working on the computer, knowing that I had a couple of hours without interruption.

That is, until the doorbell rang.

I opened the door to find Liz stood there wearing an adorable short mini skirt, and a loose fitting top.

"Hi Uncle Pete" she said, pushing past me into the room.

This was what she always did when she visited, so I thought nothing more of it.

I started to get a bit suspicious when she added, "I've come over to play with Amber." ......(cont)