I love that fic! I only listened to a few WtNV episodes, but the Dresden Files part of the crossover is extremely well done.
I wish I had time to reread it soon because there were some things I didn't get the first time (I thought I got most of the timetravel/doppleganger stuff and then another version showed up in the epilogue and I was hopelessly confused again.) The seamless crossover and combination of plot and romance were a big part of the appeal to me. I also really liked Carlos, and the scientists. Fuck yeah competence kink.