Lion Heart, a Lesson in Bravery and Cowardice

In which James learns a lesson in cowardice, and Sirius in bravery, and Harry learns that the stranger who shows up in the night is more than just an ordinary visitor, but a compendium of secrets that challenges the very lives that Harry and James lead. Vaguely follows the plot of Inkheart, but with a lot more slash and a whole lot of Gryffindors. AU