There is one, "Offers Earned, Wisdom Gained" by Jeckisalynn. It was part of the Spring 2014 exercise at Keira Marcos' "Rough Trade" site, and last I checked still a WIP. Jeckisalynn has both an LJ and an AO3 account, which are unfortunately still empty ... and as Keira doesn't allow questions about where authors archive their stories and has cleaned up her site for the current challenge, I have no idea where to find the fic, sorry.

However, if you're interested in what WAS posted, PM me and I'll send you the chapters I managed to save. It's an interesting setup, and I'd REALLY like to see it completed eventually.