This happened a few years ago. I had just finished watching a steamy movie and was extremely horny, so I went into my bedroom to masturbate. I was so horny that I neglected to close the window and the shade before I got started.
I walked into my room and immediately began to strip and massage my 44D tits. I had lain down on my bed and was alternately rubbing my tits and clit and getting really into what I was doing.
I had begun to moan quite loudly, and I guess I caught the attention of my extremely hot neighbor. He came over to my window to see if everything was all right. From the look on his face, he must have been standing there watching much longer than when I had noticed him.
This was an extreme turn-on and I decided to give him a little show while I was at it. I also noticed that during my show he began to rhythmically move as he was stroking his cock.
This threw me over the edge and I had the most amazing orgasm of my life. I screamed with pleasure and squirted a good amount all over my bed. As my orgasm subsided, I continued to slowly rub my tits. My neighbor began to moan and came all over the garden outside my window.
At that point I was horny again and began to finger myself and rub my clit again to another mind-blowing orgasm. My neighbor just stood there telling me how sexy it was that I was putting on a show for him.
From this day on I always masturbate with m window open no matter how cold it is outside. :)
Let's just say that we got together after this incident and had some great fun bringing each other off over and over again. But that story is for another time. :-D happy masturbating!