I hope you don't mind a drive-by comment... I was just skimming through the comments and came across this, and I just wanted to say, I hope you do write this fic eventually. I have a biology degree, and I love it when people put so much thought into something like this, so much effort to make it feel real. It drives me nuts whenever I come across a Dean/Cas mpreg where the pregnancy is very human-normal and the end result is a cute little baby with wings. It makes me want to write a fic where the resulting combination of a flesh and blood human and a wavelength of celestial intent is much... messier.

Anyway... sorry for interrupting. Just wanted to say I love your ideas!