Season 15: The Empty (Oneshot)

*SEASON 14 SPOILERS* ALL CHARACTERS BELONG TO SUPERNATURAL

So me and my spn family were discussing theories for season 15 and of course then we started debating Cas' deal with the empty. One of my friends wrote an amazing oneshot so I thought I'd give it a try, this contains ideas from all of us so they of course must have most of the credit for its creation.