Everlasting Nothing and the rebirth of the Morningstar

Summary: Based on an old story I read about Jack and Castiel being all that exists watching the universe die. In this one its happens because Jack no matter his Power is not God, he may have the power of God and Amara but he’s not God so after a lot of begging Chaos gives the two a choice to go back in time and make certain Chuck gets what he wants or allow the universe to collapse. Heartbroken Jack accepts. Not completely evil Chaos changes the way Chuck is at the cost of a new threat and stronger and smarter supernaturals.