Draco has no-one to hang out with, to play Quidditch with or to annoy- And that's where Potter comes in perfectly.
I do not own any of the Characters; Those at courtesy of J.K. Rowling.
You meet Draco when he picks on Harry, someone you had become friends with, and slowly figure out the bad boy wasn't a boy who had made bad choices.
He was a boy with no choices.
So you stayed.
I do not own the Harry Potter world. Obviously.