I'm looking for a story where Sam disappeared or ran away years ago and Dean has been searching for him. Dean ends up at the Roadhouse and finds that Sam has been adopted by Ellen and has been living there for a while. He also finds out the reason Sam disappeared was because John sold him to some demons. I'm pretty sure the story was on LJ and that it was multiple chapters. May have been a big bang fic.

Worth Saving by wolfish_willow