Hogwarts Vampire Professor

[Non-time travel text, no system] Dumbledore always thought that Voldemort was the biggest threat to the wizarding world, until a vampire who had lived for more than a thousand years came to his door with the title deed to Hogwarts. "A thousand years have passed, and the lease of Hogwarts is up!" Dracula said, "Mr. Principal, you don't want the students to be displaced, right?" "What do you want?" Dumbledore asked solemnly. "Anything interesting." "This is easy to handle. I think the Defense Against the Dark Arts professor position is quite interesting!" … As a result, Hogwarts has an unattended professor. McGonagall: "Albus, I don't think Professor Dracula's teachings are suitable for poor children!" Dumbledore: "I have no choice, no one can fire him." … Draco: "My father is the school director, I will definitely let him expel you!" Lucius slapped Draco on the head, "Mr. Dracula, Draco is childish, you must not expel the school board!" … This is the story of a vampire who has lived too long and is so bored that he can only find fun in the magical world.