The Sparrow and the Crow

[AU] Monster. Vanitas is a monster—at least that's what everyone says. That's what they've always said. He is a dark entity destined to leave a string of chaos and destruction in his wake and nothing can change that. He is what he is. Xion knows that, but that didn't keep her from loving him. He's a monster, and monsters aren't capable of loving someone in return, right?