I'm looking for one fic written waaaay back, where

Sam thinks Dean is dead and Dean thinks Sam is dead, that takes place a couple of decades in the future. Sam is referred to as "Frank," short for "Frankenstein," since no one knows his real name. I think he's taken over the Roadhouse at this point. He's a big fan of this one popular author's books (which are basically how-to manuals on how to kill monsters, in novel form), and through an interesting turn of events, learns that the writer is Dean, who isn't dead after all. There's a reunion, hug-hug, etc. Dean has a daughter, I think. I'm pretty sure it was gen, since that's all I read.

I read this on FFN a couple of years ago, and I'd like to read it again, if y'all can find it!

Please and thank you!