your teacher had just announced that there would be a group assignment for class, and everyone went to get a partner. You ended up not having a partner at all, so you went to the teacher

Teacher: “Well, since you don’t have a partner you’ll just have to join-“

SLAM!

The door burst open, a boy with long dark hair and a jacket came in and slumped down at a seat in the back of the class, laying his head on the desk. The teacher yelled at him, but then ushered you to be his partner.