Day 15 - A fanfic
Wow, what a question. The Supernatural Fandom really is an embarrassment of riches and it is impossible to choose one fanfic out of the vast sea of great writing that we are lucky enough to be a part of.
In the end, I have decided to plump for not one fanfic, but a series of fanfics, and so my rec is for Ash-Carpenter's fabulous 'Anti-Kink' series.
As its name suggests, it's kinky, naughty, and downright hilarious; the Wincest version of Murphy's law where everything that could go wrong does go wrong.
It comes highly recommended!