Bah. :)
"Mister Malfoy. - I hope I'm not keeping you up," he said, without a hint of any real concern, and without looking up from the book on his desk. He finished the paragraph he had begun; he didn't particularly care for the idea of letting the boy knows this was for his own good. He pushed himself out of his chair after a few moments, drawing his wand. "I won't waste very much of your time, anyhow. I don't expect you'll accomplish much in the space of our visit. ... Then again, Mr. Potter managed it at thirteen, so I suppose we ought to introduce it to the first year curriculum."