<human>: Give me a shortened version of the text

Hello reddit! I need advice. I realise there are many posts about FWB's here, but I feel like my situation might be slightly more complicated.

This girl and I have had a very ambiguous friendship (you know the kind, with sexual tension and laughter all the time) for years, and one night, months ago, after copious amounts of wine, we slept together.
However, due to the fact we lived some 1000 miles apart, we reluctantly (or I least i was reluctant) decided not to go any further. A relationship isn't necessarily what I want, but she moved significantly closer to me in early september, and I've been toying with the idea of being FWB with her since then.

I know ultimately no one can give a clear and/or perfect answer to this, as everyone is different ("as always, ask your partner" seems to be the go to answer these days), but I was hoping some of you might be able to guide me towards a sensible, considerate way to present the question to her: I know she's fine with the concept of FWB, but I'm not sure how to approach it. 

I understand I have to ask, and "man up" if you will, I'd just like your insight on what might be the better ways of going about it.
Ladies of reddit, how would you like this to be addressed if it were you? Guys, have you got any tips on how I should approach the idea with her?
<bot>: Which do you think are the best ways to approach the FWB idea with someone with whom you've slept (months ago), after having had an ambiguous friendship for years?