I was in a state of shock - Sam, Bill's supposedly staid wife, friends of some fifteen years was sat astride me, facing me, a look of pure pleasure on her face and sinking one very hot, wet, cunt onto my very erect penis. She moaned softly as she took me into her, her dress bunched up and covering our 'joint' situation - the sight of her silhouetted against the bright sunlight of the garden, and the realisation that she had no briefs on were what had given me that almost instant erection in the first place. But let me go back a little bit and offer something of the lead-up to my confusing situation.

I have been married for over twenty-five years to my lovely wife Pam. When we married in our mid-twenties I, like a lot of men in my age group had 'played the field.' Not excessively, but still, with the current threat of aids, more than would now be considered either wise or safe. Pam had had lots of boyfriends but was a virgin who had 'saved' herself for her wedding night and me her husband. Well she had saved herself, but we didn't actually make the wedding night - we had ended up in bed one wet, winter Sunday afternoon. Once she had discovered the joy's of sex we had fucked like mink ever since!

We only had one minor problem, I am fairly well built and until after the birth of our first son, Pam being fairly petite, could only take about six to seven of my nine inches, depending how excited she was. Having never known any other man she didn't have anything to compare me with and so was unaware of my size being anything other than normal. I was aware that I was rather larger than average and that quite a few of my girlfriends had been unable to take my length. It's a myth folk's that girls can take a big dick all the way in! A very few can, but even then you have to be very gentle to start with - otherwise it's hurtsville and a terrible turn-off.

Our sex life was/is exciting if somewhat conventional, my joke of going to a wife-swapping party, throwing the keys in the middle but coming away empty handed 'cos no one would give me an MG-B sports car for Pam had worn a little thin over the years.

But back to the present - here I was in the lounge of some very good friends with Sam, short for Samantha, impaling herself on me, taking all of me, bouncing on me, rapidly approaching an explosive and mind blowing orgasm of colossal proportions. Me I was about a nanosecond behind her and with a slightly strangled moan I shot one helluva load deep in her spasming cunt. The feeling as her hot, very tight sheath (they had not had any children) milked me of the last of my semen was incredible - I hadn't come like that in years.

I lay there under Sam for a few seconds gathering my wits and then began to panic. Where were Pam and Bill, they had only gone upstairs so that Bill could show Pam some changes he had made to the bathroom. They were only going to take a few 'moments.' Sam had leapt on me as soon as they were out the door - they must have heard the noise we made, after all we hadn't exactly been quiet - they would be back any second.

Sam lifted herself off my rapidly shriveling penis, briefly adjusted the chiffon fabric dress that had started all of this, leant forward took me in her mouth and cleaned me with a rapid touch of her tongue and lips, then zipped me back into decency. She then leaned forward and kissed me full on the lips. A big wet, slobbery, luscious full on the mouth kiss. For the first time ever I tasted my salty cum, Pam would never have done this. Staid Pam would never eat me to the point of cumming. I often went down on her and ate her to a climax where she came so violently I got earache from her clenched thighs and she screamed at me to stop. It was a bone of some contention that reluctantly all I got was a very little oral ministration, just a kiss and a lick almost - still that was really the only thing I missed out on. Given my length and girth I have never even given anal sex a thought, let alone been tempted to try.

But I digress, back to the now, what the hell was going on, what had led to this.

We had been before, children, Pam and myself to see the finished job Bill had made of their new house. He was one of these sickening characters who could turn his hand to anything, and had just about rebuilt the inside of the old house they had bought for a song. It was superb; I had to admit he really was very good. As DIY is not my forte I didn't begrudge it them at all. In any case they really were a very nice couple in all senses of the term. Sam had grown up a few doors away from us at one time before we moved house. When she and Bill (they had never had eyes for anyone else to my knowledge,) had been walking out they had been only too happy to baby-sit on the odd occasion we had needed it. It gave them somewhere to discreetly make out I guess. So we had watched them grow up, been to their wedding, been to their house, numerous times and now I had just fucked the ass off her.

She kissed me again and said, "Bill and I weren't the only ones who planned this." Then she grabbed me by the hand and almost ran barefoot; she seldom wore shoes indoors, with me through the house. She placed a finger on her lips and we quietly climbed the stairs. As we reached the top we could hear the sounds of obvious lovemaking coming from their bedroom. We reached the door and my feelings were overwhelmed by the sight of Bill and Pam fucking, Pam on top, one of her favourite positions, both uncaring, their eyes unseeing.

As I watched mesmerised, I had never seen another couple fucking in the flesh, as it were, Sam stroked the growing bulge in my crotch - Jesus this was hot. At fifty years old my time to recover could normally be measured in hours not minutes, or almost seconds, but here I was rising to the occasion again. Bill and Pam were naked. Pam was rising almost to the top of Bill's shaft and then plunging down, taking him all - she was leaning forward so that he could suckle her beautiful tit's - she's no Pamela Anderson, but then I didn't care she was, had been, all mine. Bill's penis wasn't as long as mine, but he was about the same size round and Pam - my staid wife was far-gone, far beyond caring.