I really liked the whole story, especially how Al's progress/illness fluctuated along with the progress/recession of Harry and Draco's relationship.
But the one thing I'm left wondering about is Rose. She never seemed to get any mention (like what house is she in?) and when she is mentioned it is when Harry makes the comment (though it could be sarcastic) that maybe she deserved being the victim of a prank. Is she the family's black sheep or something?
Sorry, I didn't mean that to come out sounding all judgmental or anything, it was just this one little thing that stuck with me.
Like I said, the rest of the story - the plot, characters, solutions, teamwork - was quite enjoyable. Thank you!