Rise of the Guardians (2012)
Rabbit Heart
by Kayasurin
Or- the story of how Jack got his heart's desire, Aster got his heart's desire, and the Guardians enacted a 'send elves through to the Warren to make sure everyone's wearing their metaphorical pants' policy for their sanity. Warnings for: Jack being a rambly bastard leading to Walls of Text. You have been warned.