"What are you doing in my house, Potter?" "You're mom"

Draco: "WHAT?!?"

Harry with most shitiest grin on his face: "Your mother, that's what I'm doing here."

Draco's face goes from pale to purple: "Wait till my father hears about this!"

"I already did, son" Lucius said from the corner, sitting in a chair with a class of wine.