Shades of Grey

Turns out Snape isn't the only spy Dumbledore has among the Death Eaters. How come Draco Malfoy is working for the Light? What the hell is the Merlin Mutation anyway? And why does Voldemort seem to want Draco almost as much as he wants to get to Harry? SLASH! (On temporary hiatus until I figure out how the hell I'm going to continue this! Sorry!)