I can't actually remember how it came about, but all I do remember is that whilst seated at our veranda table, I was wearing nought but a towel around my waist and the white slippers provided by the accommodation. I had moved my chair through 180 degrees so as to catch the sun, which left me basically, legs pointing towards our German neighbours veranda. My new wife had gone for a swim leaving me alone to snooze and soak up the sun. The German guy said something (I don't speak German so I have no idea what), and I squinted my eyes slightly open, enough to watch his fat ass disappear into their beach hut. I noticed then that his wife was glancing in my direction or so it seemed. I took no notice but continued to semi-snooze and soak up all the "expensive" sun that I could. It was only a moment or so later that I became conscious again, and it took me a while to realise that my legs had parted somewhat, and maybe the German woman could see between my legs, as she was still facing me and appeared to be looking straight at me. Her face wasn't easy to see, as I had the sun in my eyes, whereas she was turned with her back to the sun, giving her eyes shade enough to open them and stare at me.
As my eyes accustomed a little, I realised that she was indeed looking right at my towel, maybe trying to see what was between my legs. I'm not sure what came over me, but instead of covering up, I actually opened my legs a little more, ever so slowly, as if by accident or even by not actually realising. At the same time I gently pulled the towel upwards therefore exposing myself even more. The feeling of both being seen, and also the physical sensation of the soft towel rubbing on my cock started to make me semi-hard. I pretended to snooze, or at least be somewhat out of it! All the while I tried my best to see what this woman was doing, or at least to see her watching me, by peering beneath my sunglasses as best I could, without being obvious.
At some time during all of this I decided to try and be a little more daring. I casually put my hand down between my legs as if to give my leg a little scratch, at the same time exposing myself even more to this woman. By now I had a near full on erection, which was pointed downwards and sticking its head nearly out of the towel. I could see the German woman smiling, either to me or to herself. This erotic flirtation went on for a good few minutes, me pretending not to notice her and also pretending not to realise that I had exposed my cock to her, and she, sitting there, eyes half closed taking in all she could.
After some time I realised the she too had started to open her legs also. She had on a towel on her her front, but which covered her whole body, boobs down to her thighs. I noticed however, that the towel had been either pulled down or had slipped, and now I could see her lovely monumental breasts, almost to her nipples, but also, her inner thighs and maybe her dark bush, but given the sun in my eyes I wasn't sure of the last part. By now I had really opened my legs, and I made sure she had a full view of my cock and balls, even though I still had my towel draped in my lap, just in case.