Fics like Ciel Phantomhive and the Prisoner of Azkaban

Ciel and Sebastian make a deal with Albus Dumbledore to go to Hogwarts and help them deal with Voldemort, at the cost of Dumbledore's soul. The pair join Harry, Ron, and Hermione in their adventure as they deal with Sirius Black, Dementors, Quidditch, and Draco Malfoy, with a side helping of magic.

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