(Aged up for UDG I guess)
An Au where (whichever class) goes to an actually normal highschool with no crazy bears wanting them to murder their friends.
1) Prom night
2)(A) is an exchange student or just a new kid and (B) has to show them around
3)(A) and (B) are partners for a project.
4) field trip to, somewhere
5) (A) and (B) are forced to join a school play
6) (A) and (B) meet in the nurses office/ detention and talk
7) (A) gets into a fight with (C) and (B) has to be the one to break it up
8) (A) and (B) are both in the nurses office for (reasons)
9) (A) and (B) are both in the school at like 2 am to finish some sort of class work and run into each other
And many more options just say what you want to do in the comments