How do I let a girl down gently after sleeping with her?

Anonymous
I know this is a really dick question but I don't want to hurt her. So there's this girl I know and she recently became single. I also knew that she liked me but the feeling wasn't mutual.

We were on a night out together with a few friends down the pub. I had a few to drink and things escalated quickly, within the space of like 20 minutes we started making out and went back to hers. When, during the middle of sex, she said she wanted us to date I agreed; partially because I didn't want the sex stop, partially because I was drunk, but also because I didn't want to reject her.

The next morning I left and we continued speaking. She now want's us to date and due to feeling guilty I've agreed to take her out in the near future (nothing actually arranged though). I know that everything I've done has been stupid and selfish, so you don't need to tell me.

I just really need advice on how to let her down without hurting her (and hopefully without coming off as a complete prick). At this point I'm not above lying to save her feelings.
Updates
+1 y
By the way I live with two of her best friends. I've got to think about that too :S
Updates
+1 y
By the way, remember this wasn't just some random encounter. She is my friend and I'd like to keep it that way; that's why I'm hesitant to tell her the blunt truth.
How do I let a girl down gently after sleeping with her?
30 Opinion