Percy had been relaxing in his favourite armchair with a book about his favourite fictional character, Samuel Lanctot, a wizard who spied for goblins during the rebellion of 1612. His reading was interruped by a knocking at the door, which perplexed him. Usually he was interrupted by someone arriving by floo or apparating. The few knockers had been Muggle neighbours requesting a cup of sugar or change for the bus.
He marked his place and grabbed a satin, navy blue robe to cover his favourite pyjamas, tying the sash as he approached the door.
He reached for the doorknob, not even thinking to check who it was beforehand as his wards had not been set off, as they were supposed to in the proximity of those intending ill-will. He stood there, slack-jawed, as he realized just who stood there on the other side of the door.