I'm trying to find a fic I read quite a while ago. It took place after "Faith", and had Dean experiencing after effects from the electrical shock. I think it was amping up his metabolism and affecting his nervous system. This was causing him to burn out rapidly. I don't remember the case, if there was one, but I believe they were staying with a family. And there was piano playing, by Dean! Any help would be appreciated. (You might just save my sanity.)
Thanks.