Okay, I don't know if this is your type of thing but I read this really bizarre mpreg story at ff.net and couldn't stop reading it. I usually avoid mpreg but this at least made it seem somewhat plausible.

Anyway, it's called Gone with the World (http://www.fanfiction.net/s/4516385/1/Gone_With_the_World)

Be prepared, it's waaaay out there. Even the names are different. It might not be for you but thought I'd rec it anyways because it pulled me in.