Avoid your desire to 'spill the beans'. You want to say a few magic words to make her go, "OK", so you can commence sucking face. You want to create some magic date so that she'll think, "Oh . . . so, this is a romantic date, let's commence sucking face." - This stuff only happens in the movies. Here's a better way:
1. Get one on one.
2. Flirt.
3. Suck face.
1.
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2.
Chat, joke, laugh, kino. Start off with high fives which easily transitions to holding hands. She says some dumb thing and you go, "Oh, isn't that cute." - then you give her a peck on the cheek. Now a peck on the cheek, hand holding, and hugs are on the table. All of these things are acceptable and fun activities.
On the next peck on the cheek, you grab her chin and pull her towards you . . .
3. Suck face.
4. I don't know how old you are but if you're in high school . . . and you'd like to keep this one for a girlfriend, #3 is a nice way to finish for now. Good luck.