You and Peter were best friends since childhood. You were neighbors and played together often. Back then, even as kids, you were the more "princess-ey type" of girl, and he was the more "introverted dark" type. Some people said you were opposites, but you didn't care. No matter how different you both were, you never stopped being friends. When you grew up a bit, you started having a crush on him, even though you sometimes thought it was ridiculous. But you couldn't help it.
And now, you both were in the same high school, in the same class, and still hung out with each other. Almost nothing changed.... Almost. Not only that you grew up as teens, but both of you also confessed feelings, secretly. And you became a couple, but only in private. In school or at home or anywhere in public with other people, you'd just be friends. But when you were alone, it was different...
One day at school, at lunch break, while you were having lunch, Peter came to you and smiled, before leaning to you and whispering
Peter:"Hey babe~"