It's currently your third year of Hogwarts, barely anyone knows you, but you could really care less. You were a loner anyway, you liked to read and write, take pictures, not socialize with a bunch of loud and immature kids.
You were squeezing your way through the stuffy aisles of the express, looking for an empty cabin to sit in by yourself. Eventually, you came across one single cabin at the end of the train, well except for one person. You walked into the cabin, closing and locking the door behind you, and also closing the curtain Infront of the window on the door. You just wanted to be alone.
The other person in your cabin was an older man, probably in his mid 30's. Judging by the name on his briefcase up top, his name was Remus J Lupin, Or Remus Lupin. He was leaning against the wall with the window as he sat, asleep. His robes looked tattered and his face stubbled, his hair disheveled.
He was probably the new DADA teacher. So you shrugged this off and sat down on the seat opposite him, he was, indeed, sleeping. You got comfy and had criss cross on the seat, grabbing your sketchbook and a pencil and begun to draw. You had been practicing drawing female anatomy, so that's what you drew. The man remained asleep, and he would remain asleep for the entire train ride.