I sometimes take a deviation whilst walking through my local woods in the hope of coming across unexpected sexy happenings, but rarely had any luck, until yesterday. A couple had passed me on the main bridle path on their bikes, then vanished once over the brook. Following my nose, I penetrated the thicker less-frequented part that was usually damp and muddy, but with the hot weather had dried out. Having wandered about for several minutes, and on the verge of returning to the bridle path, I spotted the bikes under a tree. Feeling a little furtive, I crept slowly toward a small clearing behind a thicket, and there were my couple, he still in his shorts, but she naked. I then spotted the digicam he was fiddling with, and spent the next 15 minutes watching as he 'posed' her, each shot getting hotter than before. It was then change-over time; she took the cam, he removed his shorts and pants, and she snapped away. Whilst his cock was'nt that big, his shaven balls were enormous. At this point he went back to the bike to get a bottle of water, spotting me trying to look casual on his way back. Far from calling me names and telling me to ****-off as I had expected, he said 'Ah..you any good with a camera?' Things then moved quickly; I agreed to take shots of them kissing, touching, then actual penetration. My cock was rock-hard, a point they had noticed with some amusement, and they said 'Strip-off, join us!' The girl, a short-haired brunette of about 30, started wanking my solid todger while the guy, older and still with a decent hard-on, snapped away. 'You got a condom?' she asked. 'No.. sorry'...'Pity, I fancy you right up me...oh. go on, then, but don't dare cum inside me!' Within seconds I was in up to my balls, and realised that her feller had already emptied himself, no condom! I suppose I managed a minute before I felt that glorious sensation of nearly-cum: I pulled out my visibly throbbing cock just as four or five spurts of milky juice shot all over her arse cheeks, giving her partner some ideal close-ups. 'Thanks for your help, mate...sorry you won't get to see the pics...' I dressed and left, and I would give a king's ransom to see the results of our combined handiwork......