So there's this HB9 that goes to my school. I've known her for like a year or something and I always say hi to her at school. I saw her at a few parties and ran some game and she found me very interesting/entertaining/funny. At the most recent one, I tried getting her to sit on my lap and it kind of failed. We still talk though. Like the other day I was sitting at a table at Noah's Bagels (where I work) eating a sandwich, and I see her walk in, and I say hi to her. After she pays for her food she slowly walks over to my table, looks at me for like 5 seconds, and then sits down slowly. Then I looked at her for like 5 seconds (I didn't want to talk because I had food in my mouth) and slowly said "what's up". The situation was kind of interesting... we had a casual convo. She was shocked that I worked there.. I'm not sure why. Keep in mind she's in 10th grade and I'm in 12th. But anyways, here's the situation. I want to ask her to prom. I'm sure she would say yes considering she's in 10th grade. But I feel like the way I ask her could possibly decide if we're going 'as friends' or more. I actually don't even have her number though because I never bothered asking for it. Is that a bad thing? I don't think so.. I think the number is pretty insignificant.

I was thinking of just straight up asking her at school. Maybe saying something like "So, I need a prom date and you meet my requirements. How'd you like to go with me?" I talked to my friend's girlfriend, who is friends with this HB9, and she said HB9 appreciates cute things and suggested that I get her flowers and put them on her car or something and then wait by them... that's not really my style. If I were to get her flowers, I'd put them in her locker or something, but I've never even bought flowers for a girl. I feel like asking a chick to prom could require some AFC moves. So here's my question:

How should I ask her?