Omg! Become horny watching a stranger fuck!

The other day I left my partner alone with a prospective tenant when I went to view a flat. When I came back, I caught the two of them having sex! I was totally shocked and wanted to barge straight in, but as I stood there looking at them, I suddenly got really horny! It totally excited me to secretly and silently watch the fuck and I found it exciting to be the voyeur! As they couldn't see me, I took my trousers off and fingered my wet pussy, imagining I was getting so horny myself. I got wetter and wetter until I had a violent orgasm! It was a really amazing experience! Oh yes, and I got the cream too! Peeping tom, how?