I've always enjoyed having discrete sexual encounters with strangers, but I had an experience the other day that topped them all! I use a dating service to meet men called Adult Friend Finder. It's usually pretty good at hooking me up with guys who want a no-strings attached sexual affair. The other day I met this guy at his apartment for a little touchy feely. He was cute and we hit it off right away. Before I knew it I was sucking his cock and then bouncing up and down on him weeping in pleasure as he fucked my tight little pussy good with his big hard cock. I closed my eyes to help intensify the orgasm I had building inside of me and when I opened them I almost had a heart attack. There was this young woman staring at me with a look of total shock on her face. I didn't know what to say, as I still had his cock inside of me. She moved closer and looked me in the eyes and somehow I think she got turned on. She whispered 'mind if I join you?' and when the guy I was fucking saw her he almost lost his erection he got so scared. But she joined in and we began what became one of the most erotic threesomes I have ever had. He fucked both of us several times before blowing his load and after we had all cum she looked him in the eyes and told him he had 2 hours to pack his bags and get out. Then she looked at me and thanked me for showing her what an asshole she was really living with. I told her I had no idea he had a girlfriend and wouldn't have done him if I had known (which of course was a lie) - but she smiled and asked me how we met. I told her about the Internet dating service and she thanked me for being so honest. I left feeling kinda bad that I was a home wrecker, but I saw that girl put up an ad on the dating service the next week so I don't think she was any angel. I hope she enjoys meeting new men as much as I do.