A walk in the woods

Round by where we live is an amazing Bluebell wood and during the early season we love to walk through the woods here in our normal nakedness. Early one Saturday we set off in the car (naked as usual) to our favourite walk. We parked up and set off in hiking boots (only) up the path into the woods. Our intention was simple a fuck in the bluebells. We had down this before in this spot and it really was ideal. Normally private (but we didn?t mind being caught out adds to sexual excitement for us both), but on this occasion it seems another couple had the same thought in mind.
As we rounded the corner I could the naked bum of a male bouncing up and down in the bluebells. Either he was having a wank or there was a female under him! Well it certainly was not the former!
He was busily grinding his cock into a young 20ish girl with great tits and (so we found out later) an hairy pussy. They were oblivious to us and so we decided that we would get on with what we have come here for on the other bank of bluebells on the other side of the path.
It transpired later that they knew we were there and wanted us to watch them fuck so that they could watch us! I laid down on the ground and waited for Sandy to lower herself onto my hard cock. I love the way she slides my cock into her pussy, slowly and gently until she is full of hard cock. She then moves up and down the shaft with her pussy and squeezes it tightly into herself. She has great control of her cunt muscles and it really turns me on.
As she was gently fucking me I looked across at our neighbours to see that they too were now in the same position. I noticed that the girl was watching Sandy carefully and matching her thrusts to hers. This was a real turn on and I was getting harder and more ready to fill Sandy with hot cum.
The girls both stopped at the same time, stood up, walked to the opposite partner and without a word of warning started fucking the other man. Now this was so hot I nearly came. Watching Sandy fuck a complete stranger while his girl was grinding her cunt onto my cock was nearly too much for me!
She was petite with solid 36D tits, hairy cunt and an insatiable appetite for cock (so it seemed). She rode me like she had done this many, many times before, trying to make me cum. She came and soaked my cock with her juices. Then without a word the girls swapped over and Sandy was back on top of me in time for us both (both males that is) to come together up our respective partners cunts.
I continued to fuck Sandy in the old doggy position until I had come again and so had she. Our new friends copying our moves until they had both come again too.
This was the first of such encounters and one which we both enjoyed very much. I guess we are lucky but we meet up with these two on regular occasions now and often have a threesome weekend in our garden under the stars.