So, let me start out by saying that about a month ago I broke up with my girlfriend of a few years only to find myself single, still in college, and with absolutely no game. I'm still trying to get over what you guys refer to as AA, but since finding this subreddit a few weeks ago you guys have definitely helped. So thanks!

So on to the field report:
I was at a good friend's party. (They have parties often so it was a pretty familiar and comfortable environment.) I also generally knew who was going to be there so I kind of "pre-planned" the girls I was gong to go after. There was one girl whom my roommate and I have known for about a year, but only recently starting hanging with her and her friends since I became single. We'll call her Girl A. Now, Girl A has a boyfriend but she's always very flirty. I don't really ever try to hit on her too hard since shes already taken and I don't want to scare her off and lose "access" to her friends. But I'm open to see what happens. So she shows up and brings a few friends which include her boyfriend (dammit, now shes off limits for the night) and a few other girls I've seen / been to parties with before. One of which we'll call Girl B. The third and final girl that I kind of had my "sights" on we'll call Girl C. She is unrelated to A and B but is over at my friend's place very often. I know her fairly well but since she's over all the time I kind of assumed that she's already in that "friend zone". But again, I'm a guy and willing to see where things go.

So the party starts to get pretty crowded, I've got a few beers in me, building up courage, and I'm doing pretty well with Girl B. I'm trying to do some beginner kino, touching her arm, had my hand on her side at one point and I think she responds pretty well, but she's a very energetic girl so it's hard to tell. Then my ex girlfriend shows up and it reaaallly puts a damper on my game. So, my flirtations slow down, ex still gets offended by me even talking to girls, I do damage control and by the time my ex leaves the party, Girl A and B have left to go back to their apartment. Also, the party has generally died down and I'm a little disappointed that I didn't get to work on Girl B any more. So all thats left is a few of my close friends and Girl C. we are all just talking and having a generally drunk/good time. Then at some point for whatever reason Girl C and I are alone and we start making out. I don't want to even contribute this to anything I was working towards since I almost deemed her "off limits" and "as a friend". And we were both pretty drunk. So we kind of quietly leave my friend's place together as to not cause any drama with people seeing us hook-up, and we go back to my place. I was actually really excited since I hadn't been with anyone since my break up and Girl C is actually pretty damn attractive. So we make out on my bed, have some pretty good sex (for a drunken hook-up at least) and when it was over I remember her mentioning that she wants to do this more often, strictly sex, and just so our friends don't know. Well she's drunk so I take it with a grain of salt.

So next morning, we wake up, surprisingly wasn't that awkward at all (I forgot to mention that since I'd been in an exclusive relationship for most of my college life I'd never had a one night stand / drunken hook-up like this before). I asked her if she had a good night / would like to do it again. And she basically says "Well, you know I'm over at so-and-so's place all the time so we'll just see what happens." We start kissing while in bed, and I try some of the "escalation ramp" just in-case she wants morning sex , but I don't push it very far and we stop. So I drive her home.

Now I'm just left wondering how to take the next step. It would be great if what she said when she was drunk was true and that she actually wants to get a sort of FWB thing going, but I'm not exactly sure how to get that started. Also, I feel like I did not really have "control" in initiating the whole event. As in, I didn't really plan it; so does that mean that I was just "played" by this girl? Any comments / advice will be much appreciated.

TLDR: Went to party with a few options for girls I was planning on hitting on. Ended up, almost unintentionally, hooking up with an acquaintance/friend of mine. She hinted, when drunk, about being a FWB. How do I make that happen?