I like to booty bumping too. It's easy to play off as an accident if it doesn't go over well.
I don't like the friends first or romance line because it's relationship oriented and I think it's better to add shock value or keep things light and fun. I actually like the "is kissing cheating" line better because you learn how wild she is.
I think you did awesome if you talked for 5 minutes. Most of my sets don't last that long. I either number close, kiss close, get shut down or eject by that time.
You should not have talked that long until your game can flow well. It's best to get them interested then pull a takeaway.
Listen, women love mystery. It drives them crazy. They want to be surprised. Have you ever told a girl you had a surprise for her? She freaks out and keeps asking what it is even though she doesn't want you to tell her, right? Apply this to your takeaway.
When things are going well, early in the set, tell her you're supposed to meet a friend of yours or whatever. Smile and say let's have more fun later. This plants a seed that she had fun. Even if it didn't seem so, after it sinks in and you leave she will believe she had fun more than if you never said that. As you start to turn to walk away, turn your head back to her and say, "You know I had a compliment to give you, but it's kind of off the wall so I'm going to keep it to myself for now." Make sure you have a playful and confident smirk on your face (imagine you are sexy when you say it). She'll beg you to tell her but don't do it. Tell her the old "you don't know each other that well yet" or something.
This does a couple of things. Even if you don't like the girl you never have to go back, but you get the pleasure of leaving on your terms and that power will carry your confidence into the next set.
If you do like her, you have now created an interest and intrigue. If you see her later and she asks you, smile, take her hand in yours, lean in to her ear as if you have to whisper it and say, "I really just wanted to smell you." Then smell her neck and say, "mmmmm..." If she seems disappointed you can always say, okay I did have a compliment but I didn't think you could handle it. If she begs you to tell her, lean back in say...
You'll have to come up with your own material here

No, No, that's the left. We want the good one.