Haha, Harry fell faster into attraction with Draco than I thought he would! But then again, this isn't supposed to be as long as 'Changing of the Guard', you said, so I shouldn't be surprised xD
I wonder who tried to curse Harry - and why Harry didn't have wards... or maybe he did but they weren't strong enough; but someone would have to be very angry and hateful for that... and it's Harry. Maybe it was Julius or Xavier, who saw Draco and kinda flipped? I think both would be capable of doing so (with their past actions).

Insert "yay still more to read"-comment here x)