Elizabeth and Rosemary swap places.

Rosemary and i decided to swap places when we went to a
party to celebrate our last day at school.
We promised to keep our identities hidden for as long
as we could,knowing someone would realise sooner or later.
We stood naked in front of a mirror and we looked exactly
the same apart from our bits and pieces.
Rosemary had small breasts and slightly rounder hips but
otherwise we looked alike.
The bet was,the one who let the secret out had to do all
work round the house for a week,a real deterrent.
We spent a long time getting ready and when we arrived at the
party everyone accepted us as we looked,brother and sister.
My best friend,Robbie, had always liked Rosemary but his admiration
was not reciprocated and likewise Rosemarys best friend Ana,had
always liked me but i wasnt too taken with the idea.
Needless to say Robbie and Ana came across to us soon after we
arrived and were completely unaware of our identity switch.
The music was loud and the lights were low so it was easy to disguise
our voices.
We had a few drinks and Robbie chatted to me gradually getting more
amourous with his comments.He was completely taken in by my appearance
and i was loving playing the young lady,shy and reserved.
I really thought he would twig but as we had more to drink he suggested
that we go outside for a smoke .
What if he tried something,my mind raced,i would have to tell him and
lose the bet.
I spotted Rosemary deep in conversation with Ana.I walked across feeling
very sexy in my dress and heels.I could feel the eyes on me and i loved it.
As i walked over i wondered how many guys wanted me at that moment.
I could feel my panties tightening .
They were both quite drunk and i had to move them towards the door into the
garden where Robbie waited expectantly.
I had always admired Robbies body,i had seen him naked many times at school.
He was smaller than me but excelled at sport and was very fit.
Whereas i was very musical and artistic .I had never considered
him sexually but as the drink and weed took hold i really rather fancied him.
The girls started dancing, hanging on to each other moving to the music oblivious
to our presence.
We sat on the grass watching the girls getting more and more amorous.
It was obvious to Robbie who i was now but not a word was said.
They were nuzzling each others necks and then kissing very passionately.
I couldnt believe Rosemary was actually having sex with her best friend before
my very eyes.
I was mesmerized ,they lay together in a soixante neuf position licking
hungrily at each other.
As i stood up I felt Robbie pressing himself into my bottom and licking my neck.
His hand moved down my stomach and as he lifted my dress he rested his hand
on my inner thigh.
I am a great believer in fate and as i heard the first bars of my current
favorite song ,brothers In Arms by Dire Straits,i knew there
was no going back.
I dropped down on all fours and offered myself to Robbie.
He entered me slowly taking my hardness in his hand.