My vote is definitely going to Grace has Two Daddies.

Last year I voted for the Dean/Cas Civil War genderswap when I don't ever read genderswap or historical fic. This year I've voted for the kidfic in a fandom I'd never read before (at that point, but ah thanks for giving me a new fandom, I guess?), for a show I don't watch.

To be perfectly honest, I'm baffled and kinda worried about the things WIPVEMBER makes me do.