Along with it was the summary and comment: 'Dean is de-aged and finds a lot of things that he had once hid from those around him starting to be revealed. This is a little confusing at first, maybe, and the flow is sometimes a little uneven, but it gets better as it goes on. Dean/Castiel, Sam/Gabriel. With bonus Adam! WIP.'
Unfortunately, it appears that it was deleted - the fanfiction.net link says it doesn't exist. I did, however, manage to track down the author to her tumblr, named 'insanitywithaprettyface'.
Does anyone have a copy of the fic? I'd really appreciate it.