I've just got back to my office and had to write this down whilst it was still fresh in the memory. I'd been working near my house this morning so decided to grab a sandwich at home and sit out in the sun for a while, so I shot home, put my shorts on and relaxed in the glorious sunshine. I thought I saw my neighbour's curtains twitch but just presumed it was the wind. Nothing had happened since my performance for her and her friend a couple of months ago and I was pretty certain that I had scared them off by suggesting we might take things a bit further. Thinking about this made me feel a bit horny and I could feel my knob springing into life when my back gate opened and in walked the 2 ladies. They looked fabulous, both in summer frocks with my neighbour looking trim and fit and her friend's dress showing off her truly magnificent tits. "We saw you in your garden and thought we'd come and join you" they said, "but we think that you're a bit overdressed". Before I could say anything, her friend just said "take the shorts off". It wasn't exactly a command but she clearly expected me to comply, so who was I to argue? The shorts came down, after a bit of a struggle, given that my knob was in full up periscope mode. "Finish your sandwich" she said, which led to the surreal situation of me sitting bollock naked, with a stonking erection, chatting to my 2 immaculately dressed 70 year olds. They explained that they were both widows but that, whilst their husbands were alive, they'd done everything together as a foursome - and it seems that quite literally meant everything. That explained their girl on girl action I'd witnessed several weeks earlier. They also made it abundantly clear that I didn't figure in the equation, other than to provide some light relief and enable them to enjoy a naked male ejaculating without any added complications - they seemed entirely happy with whatever they got up to between themselves. I suggested that it was only fair that, as I was completely naked they could at least take their dresses off, to which they agreed and then surprised me by removing their bras as well - "but no further they said". I didn't need any more, the sight of those magnificent tits with huge erect nipples was just too much for me and I stood up right in front of them, cock in hand, and started to slowly masturbate. I was determined to drag this out as long as I could, but it wasn't made any easier when they each started to play with their own and then each other's nipples. This wasn't good, I could feel the spunk rising so stopped what I was doing and just concentrated on watching them. Once they realised what was happening they just started kissing and fondling each other, hands all over their tits and down their knickers as I just watched open mouthed. They were gradually getting more and more excited and her friend just turned to me and ordered me to spunk all over them. Being a gentleman, who was I to argue? By this time I was stood over them as they just concentrated on bringing about their own orgasms. My hand was going faster and faster as I yanked the foreskin back and forth, gradually building to what I knew would be a huge and messy orgasm. Somehow they beat me to it, both crying out as they went over the top and the noises they made were enough to finish me off. I fired spurt after spurt all over them so it hung from their hair and tits and ran down their faces, it was just so horny that I didn't want it to end. Gradually we all calmed down and regained our composure. There was no embarrassment, we just sat there grinning at each other as they tried, fairly unsuccessfully, to clean themselves up. For a man in his 50s I had fired a hell of a lot of spunk over them. Eventually they decided it was time to go and just pulled their dresses over their heads and picked up their bras. "Time for a shower" they said as they let themselves out and my cock twitched at the thought of what they would shortly be getting up to in the shower. I was astonished to realise that the whole episode hadn't lasted much more than 30 minutes from the moment they arrived as I headed inside myself to clean up and go back to the office. It was one hell of a lunch break and I just hope it's repeated a few more times during the course of the summer!