So I read an MPreg months ago that I really loved, and now I can't find it again.

I don't remember all of the details, but here is what I remember:

* There was no Wincest, I'm pretty sure
* Sam was pregnant and close to term (8-9 months?)
* The baby was not human, but a merbaby (I can't remember how he got pregnant with it though)
* He went into labor and Dean tried to coach him through it, and a merman (possibly a king or Poseidon?) showed up to assist
* Sam's pelvis was too narrow to deliver the baby on his own, which was why they needed the merman's help
* In the end Sam gets to keep the baby instead of returning it to the ocean

If anyone knows what this fic is, please let me know. I've been searching fruitlessly for months!