Pagan Gods (http://archiveofourown.org/works/238353?view_full_work=true)
It's part of a wider verse but this is the only fic I've read of it and it all makes total sense. It's a crossover with SG-1. The Persephone stuff is quite far in to the story - it's a 'Sam breaks Dean's deal' AU. It's Persephone!Dean and Demeter!Sam. Hope you like!

Edited 2014-06-19 12:07 am (UTC)

Sounds interesting. Thx