To cut a long story short...

My best friend's neighbour invited me out, and my bestie said i could sleep at her's when we arrived home and to call her. {She had work most of the night.}

We got dropped off home at 2am both still very drunk and i was going on about Nintendo Wii and he was like I have one let's play it! He had tried to kiss me twice while we were out that night, and i drunkenly told him that I was very attracted to him but my friend had told me not to kiss him because he's a sleaze.

We were pretty drunk at his house and we ended up having sex, then I went and slept at my best friend's house.

I feel really horrible about it, and I don't know how to tell her cause I'm scared she will get angry.

He has suggested that we continue seeing each other in this way, and I am not looking for a boyfriend at the moment
and he isn't looking for a girlfriend but it was a really fun night and I enjoy talking to him as well.

So I am sort of interested in continuing it but wouldn't be able to do it without my friend's permission.

But how do I ask such a question? And what if she says no... And do I mention the drunken night :-/

She's my closest friend and I don't want to lose her ever.