Just as I rounded a large rock on the stony foreshore, the overweight man in his fifties was rolling off his wife, squeezing the last of his cum onto her opened thighs. The rest of his delivery was slowly running down the side of her fat belly. She spotted me looking at them, and I had expected the usual 'push-off' response, but to my amazement she said 'Come here, Luv-he's left me short again.' I have to admit that in walking along the rough deserted foreshore towards the naturist beach nearby, I had been gently working my cock, and at the time she spotted me it was a respectable half-mast with foreskin right back. 'Go on, mate-just make sure you pull out before you come, she does'nt like it in her.' This advice from the husband suggested that this was not an uncommon scenario. Long experience has taught me never to decline a shag, so I lay beside her starting the usual tit-stroking and fanny-carressing formalities, but she just grabbed my hardening cock and literally pulled it into the forest of grey-brown hair concealing her cunt. Her aim was perfect: Straight in, the moist lips of her labia closed over my hard helmet, and adjusting my position I was able to achieve full penetration within a few strokes. She grabbed the cheeks of my bum and pulled and pushed me into her rythym. 'Oh, that's good...yes, I like that..' her excitement mounted to the point of frenzy which brought on my own climax much quicker than I had wanted. She sensed my situation, and pushed me out of her vagina just as the first of several jets of milky white spunk shot from my glistening cock all over her large floppy breasts and down over her tum. she then started to wank me furiously until there was nothing left. Phew! Moving off her now-sweaty body, I realised we had an audience - a young guy was stood watching us, encouraged by the smiling husband. I also noticed he had a small but rigid cock already dribbling a lot of pre-cum. 'Come here, Darlin'-cpome to Mummy!" She reached out and pulled the lad towards her, sitting up and taking his tool in her mouth. That was probably her mistake, as he came after only a few seconds, his spunk squirting over her hair and face. We both made our excuses and left, but to this day I regret not having stayed to try and satisfy the insatiable slut of a Sussex beach....and perhaps I should have spent a little time with the other guy, who's cock still had'nt deflated as we went our ways. I could have had a lot more fun with that arse...