It was quite recently, with a female friend and co-worker. She was and is seeing someone, but was apparently looking for something else at the time. It all started in a hotel where we were both staying, with an invitation to drink some wine at her room ( which I refused). A few days later we started sending each other text messages, which became more and more intense. (She had her first orgasm from me when she was masturbating after a seriously sexy exchange.
)
We moved on to e-mails and MSN chats. Then I decided to invite her over for dinner and a movie, while her boyfriend was away for the weekend. We both knew it could (and probably would) end up with us having sex. After letting her in, taking a seat, I couldn't believe it was happening, and couldn't decide what to do next. After a long and awkward silence. she started kissing me and I started kissing back. After a while she sat on my lap, and continued kissing. I went on to exploring her body. Her panties and my pants ended up soaking wet... So we moved on to the bedroom for some serious fucking. A few hours later we finally decided to eat dinner.
After that first time, we did it a few times more. Eventually we decided to stop doing it, or at least stop planning to do it. She liked me, and really (really) liked the sex, but she wasn't ready to leave her boyfriend. But I wouldn't be surprised if it were to happen again. We really have a lot of chemistry together.
And yes, I know it's wrong to have sex with her while she's in a relationship. Sorry, my bad.