A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire.
A serious take on the HiE self-insert genre. This is the story of a by all accounts normal human being, caught up in events beyond his control. Forced to deal with the possibility of being stuck in a world that's strange in more ways than one.
Celestia likes her routine. Tax reforms, grants, laws and construction projects are all a princess needs to be content. It's just her luck that for Pinkie Pie, "content" is not nearly enough.