In college I was on a junior year abroad in Europe, and the city I was studying in had an annual festival in its Medeival “old city” (complete with cathedral). The festival was relatively tame, consisting mostly of going out drinking.
Well I had been walking around the old city alone, not being much of a drinker myself, and was getting ready to head back to my dorm. I was walking past an alley and saw a man whose back was to me, who was moving in a weird way. Once I looked closer, it looked like he was making out with a woman against the back wall of the alley, although I couldn’t see much of her. I don’t know what posessed me, but I walked slowly and quietly into the alley. It soon became clear that he wasn’t making out with a woman as much as *fucking* a woman, standing up, in an alley! It also became clear that the 2 of them were drunk out of their minds and didn’t know the world existed, let alone notice me.
I was so turned on by the idea of watching people fucking that I abandoned all sense and walked right up to them, but they still didn’t notice me. I could hear him grunting as he was pumping into her. Then, I don’t know what posessed me, but I reached my hand in the direction of her pussy to feel it. What I instead felt was his cock pumping in and out. I guess it was because I couldn’t see what I was doing, and I was not in my right mind, and it all hapenned fast, but somehow my finger ended up *in* her pussy, while his cock was still pumping! I remember it like it was yesterday, even though it was many years ago. It was my right index finger, his cock was rubbing the back of it, and the front if it was touching her pussy wall, which felt extremely wet.At this point I regained my senses and felt some normal fear finally. I pulled my finger out and ran away. I glanced over my shoulder and saw he was still fucking her exactly the same (I guess the alcohol was slowing down his cuming) as if they hadn’t noticed my finger invasion at all.
Once I got a chance to think about it, I came up with the theory that even if they felt my finger, each one probably assumed that the other one was putting their finger in there. Once I ran for a few minutes and could see they weren’t running after me, I looked at my finger under a street light, and the front was covered with something that looked like semen, but a little more on the clear side. I’m not sure if it was just her secretions or if there was some male cum too. Definitely one of the hottest things I’ve done.