Draco laughed, cheered by the brief presence of the Patronus. "Father wouldn't dare be offended by a war hero. Grandfather and great grandfather would. Great great grandfather would be dreadfully disappointed in all three of them and remind them that they knew perfectly well that his mother was adopted by the Prewitt family. And that his grandfather paid the Malfoy family to adopt him because they had no heirs and a lot of debts."

He shrugged as he finished getting dressed. "That was the origin of Mudblood as an insult. Someone who didn't even have the worth to convince a wizarding family to adopt them or someone like Delores Umbridge who ran their family so far down that someone without connections or money wouldn't even want to be adopted by them. Either way. It's how we used to prevent inbreeding until the 'Industrial Revolution'. Which reminds me. I must try and get Binns fired or exorcised."

He held out his arm to her. "Are you ready?"