Before she could respond to that, an owl swooped down and tapped her beak against the glass of the window, then, when no one opened it for her quickly enough, tapped again with impatient disgust.  Draco gave her an awkward smile before he opened the window and let the bird in.  He wanted to tell her all about the potion.  He wanted to tell her he was trying to do something right, something meaningful. He wanted to explain he hadn't want to apologize until he had more than empty words to offer her.  Instead, he took the letter the owl had tied to its leg and patted the bird on the head.