A human goes to Equestria on accident and immediately breaks his neck. Twilight has a spell to fix him up but it has unexpected side effects.

Dude becomes chick, slowly turning into pony. If it sounds up your alley check it out.

Once again I've changed me my regarding the fate of this story. It's different enough from my rewrite to continue on in a different direction. So it will be receiving infrequent updates.