DUDE! Please don't delete.
Sirius has been best friends with Bree since their first year. And when he feels as though she means a little more than that, he does all he can to deny it.
That is, until certain events unfold which make denial impossible.
Now, he not only has to worry about getting the girl, but getting the girl to see he is more than an inconsiderate prat, and still worth having as a friend.