I can't remember the details of this but I remember being intrigued. The story is based around a teenager (I can't remember what name he goes by) who is caught doing something bad, like maybe stealing Dean's tractor? Dean at this point is middle-aged and grumpy and I think has a bad leg or some kind of similar affliction, and he lives on a farm or a big plot of land or maybe just an old house. The teenager is sent to do housework/yardwork for Dean for the summer to make up for whatever he did. Yadda yadda, stuff happens, and it turns out the teen is Cas who lost his memory from falling or something, and he doesn't remember who he is until he gets his grace back out of a lake. Or something. Obviously my memory is wonderful. I can't remember if Dean knew it was Cas all along or not. It does end up being a kind of Dean/Cas fic, although Cas never looks like Jimmy Novak again, interestingly enough. I don't remember Sam being around so it may have been a post-Season 5, Sam-is-stuck-in-hell fic. It was just really different altogether and I'm mad I didn't save it. I hope someone can help me out! Thank you!

EDIT: found! By Some Unseen Light by melo.