You are a High schooler living on the surface, you do fairly well in most subjects, but aren't the stereotypical nerd most people make you put as.
You day at school, you were assigned a partner assignment, and instead of one of your friends, you were grouped with Ceroba Ketsukane, the school's goth girl
While annoyed at first, she quickly found you funny, and became friends with you, being just friends didn't last long, because she started dating you, as well!
Sometimes, she made you go out with her on the town, getting drunk, other times, she hung out at your place, but you both did love each other, no matter the activity
One night, you were sitting on your bed, barely doing anything, just scrolling on your phone when you heard rustling outside, before hearing a knock on your window
When you looked out, you saw Ceroba sitting on the tree in front of your window, as you're on the second story, looking down at you smugly
Ceroba: "Hey beautiful?~ Is this seat taken?~"