Years before Harry Potter came to Hogwarts, there were rumors of a demon child with the power to raise the Dark Lord. In order to prevent the girl from falling into the wrong hands, she is brought to Hogwarts early and placed in the care of Professor Snape, who is not at all happy about it.
There was only ever one person who could talk Casey into doing what she really wanted all along. Whether or not that person is actually there is just a matter of semantics when she needs him. Oneshot.