As the header says I'm looking for a specific fic that I read years ago but I have now lost.

I remember that it was a Mpreg fic. I think it was Dean, but I'm not 100% certain, who was cursed by a fertility goddess (as a thank you I think?) and then he became pregnant. The brothers ended up in a town where the doctor from Croatoan had moved to and she becomes their doctor. I think they settled down in that town and got new identities so that they weren't legally brothers anymore (there was a spell involved?). I'm pretty sure that Sam started work doing something with the local sheriff.

Major plot points that I remember:

Later in that fic or possibly in a sequel Sam and their kid got into a car crash but were virtually unharmed because the Impala is made of strong steel and didn't crumble like a new car would have. Also later in that fic or maybe in the sequel Sam is worried about their kid not walking yet and he is concerned because they are after all brothers and maybe that has genetically affected their kid. But at the doctors office the kid starts walking just before their appointment.