Background: i'm a senior from Ohio. Our school has this tradition of signing yearbooks. This girl, who i thought was out of my league (like wtf?), just put down her cell #on my page and wrote that i should call/text whenever i want. It's so random. I was completely caught off surprise.
Anyways, we have a formal ball next week and one of my close friends is taking her. But it's a weird three-way "date" between him, her, and one of her friends. I don't think she even likes him, that's why she drags her friend along.
Anyway, is this a big IOI or just like a friend giving another friend her number before the summer? In what manner should i initiate the contact? She's so fine.
Another question, I called this one HB gorgeous. And now, every time she sees me she calls me gorgeous as well.

IOI or just playing around. How do i escalate? I think i can get her number easy but where do i go from there?
FYI, please keep in mind this and next weeks are exam weeks. Also, which girl should i go for? I'm not really looking for a lay, just some kissing and a few bases would be more than enough. Specific advice would be greatly appreciated.
By the way, a little info on me. I'm 6'3, basketball player. Very smart, going to an Ivy next year. Voice is a little light. Depending on my nerve/mood, i can be really entertaining or really really dry.
