I hope this does happen in th show

Awesome story!

Oh...oh wow... this was... SO AMAZING.
And completely plausible. I mean, how else could the twins survive the crazy mysteries of Gravity Falls?

Great job! This sounds like you worked hard on it! Or maybe you just have mad natural talent. ;D

Snaaaaaaaaap yoooooouuuu !
You relize this could make a great multi chapter story
great one shot though I must admit

Wow. This was good. I mean, REALLY GOOD. I'm surprised, considering that it's a bit dark. I have to admit, it made me kind of sad, and also a little creeped out. You did kind of lose me with the "Ghosts Inhabiting Their Bodies" thing, but I got over that eventually. I'm on the fence about whether or not it was a good idea to keep what exactly the twin's heritage was a secret from the reader. On one hand, it keeps it open to possibly fit into canon later on, depending on the eventual plot, which I could see happening. On the other hand, it feels anti-climactic, as the reader probably wants to know. I know I did. I could actually see this as a canon piece, minus the aforementioned issues. Keep up the great work.