Theres a girl I have a few classes with. She's about 4 years older than me and likes me a lot. She sort of hinted that she wanted me to hang out a few times and I tried to kindly show I wasn't interested just with body language and everything. She invited me to a party and got one of her friends who knew me to give her my screen name and IMed me to remind me. She was a cool girl and one of my friends, and I didn't want to be a dick so I went on over and had a few beers with her and her friends. She was drunk and kept mentioning that I was hot and she wanted to have sex with me, but I tried to politely dismiss it as crazy drunk college kid talk (she talked a lot about sex and stuff anyway). After a while she said "lets go to my room" and said "let's make out" and said she really wanted to go down on me. I thought about it for a second and told her only if she promised that it wouldn't be awkward and she wouldn't get attached, that we would just mess around and have fun. She said I wouldn't have to worry about anything, it wouldn't be awkward and she wouldn't get attached. So we fooled around for a while, and I spent the night. She was REALLY into it and really liked me. The next morning we talked for a little bit, and kind of agreed that we could be friends with benefits and fool around every now and then if no one got attached.
She has been with a lot of guys before, and seems pretty mature and down to earth. What should I do now? Will it be possible for us to keep this stuff up until I find another girl without hurting her feelings? If I should cut it off, what is a good way to do it without hurting her? My main goal here is not to hurt anyone's feelings, I have no problem doing this (while I don't have a girlfriend of course), but only if I'm not going to end up hurting her.
Thanks,
Crispy