No Regrets, Yet So Many

Entry for Quidditch League Fanfiction Competition Season 2, Round 6 - "Sirius, This will probably be without a shadow of a doubt the strangest letter you've ever received, and if you are indeed reading this many years from now then I'm sure you'll remember exactly why I'm writing this." Sirius Black writes a letter to his future self from Azkaban, listing his hopes and regrets.