I feel like if Supernatural does end, it can only end in death, sadly. I mean, unless something totally impossible happens like God actually lending a hand. But I also really want it to have a happy ending. So here this is, a somewhat happy-sad medium.

Their broken bodies lie side by side, together till the end. They're still fighting, hanging on by a thread. It had been a hell of a fight before. Angelic factions were hard enough to deal with. Throw demons into the mix and they've got another apocalypse on their hands. But somehow, they'd found a way. They always do.

But saving the world comes at a cost and the injuries they'd suffered during the fight can't be healed. Not now, when they finally succeeded in tossing the angels back into the great beyond and shutting the pearly gates. So here they are, lying in the field where they'd taken a last stand and hadn't expected to come out alive. And in a way, they were right.

They pass onto the next world together, their souls floating up and out of their bodies and for the moment, they're spirits, clinging to the world they fought so hard to protect. Letting go is hard, especially when they still have so much to do. There are still demons running amok, still monsters to kill and people to save. But they know better than anyone else how dangerous they can become now.

They don't know where they're going to end up. Heaven and Hell are equally viable choices. But all of their doubt disappears when Castiel appears to them. The big man upstairs who up to this point, they'd thought absent, has restored Castiel's angelic status and he strides towards them, white wings outstretched behind him.

He's the last angel to leave and the older of the two makes a joke about ET. Castiel only rolls his eyes, still so human in some ways now. There's sadness in his blue eyes, because even though he's returning home and escorting the other two there, the latter is something he never wanted. They each take one of the angel's outstretched hands and then they're ascending, faster and faster until the clouds and sky swallows them up.

When they reach the other side, things are no different than they appeared on Earth. After all, they've been here before and they vaguely know how Heaven works. And rather than separating, they stick together, each the other's personal heaven. Without the weight of the world resting solely on their shoulders, they're family again. Of course, it's not as though they ever stopped.

Eventually, they meet other people, travel to other heavens. They see Bobby again. They drink beer with Ash, Ellen, and Jo at the Roadhouse. They visit Kevin and make amends. And finally, after a long, long time, they go home.

Mary and John greet their sons with sad smiles. Their house is still the same as it was before they'd been pulled into the hunting life. Castiel visits them there sometimes, keeping them up to date with the world. Things have calmed down significantly now that the angels have left and any problems caused by demons or monsters are being taken care of by other hunters. And for the first time in years, they can finally rest.