Seeeee, the thing is *geeky moment* mpreg is sort of vaguely possible ish. I mean, not actually gonna happen in our world unassisted, but it's not totally bonkers to me (yes, I have spent hours with a textbook thinking about it). Yes, some AU where anatomy and physiology is altered a little is simplest, but it's never struck me as so very cracky which I think gave me a good head start *g*