Dean always had Michael living in him, but Michael was sorta dormant/sleeping. Team Free is at Bobby’s when they discover Dean is Michael because either Gabriel or Castiel speak Enochian. Castiel is possessive of Dean and doesn’t want Michael to take him away. There is a huge battle/apocalypse in Las Vegas. It is Castiel/Dean.

Any help is appreciated! I’ve been looking for this fic all day!