Notice: This is a gathering of Oneshots about Castiel and Dean. They do not depend on eachother and is meant to be read individually.
Dean opened his eyes and found himself on his back; blue sky with white, fluffy clouds was all he could see. A sun gleam caught his eyes and blinded him for a short moment; just long enough for him to allow himself to feel, noticing for the first time the ground beneath him - soft grass and sun-warm earth - and a peaceful, soothing presence all around him. Then a sudden realization made him recoil. He knew the feeling of this place; no matter what scenic environment this place would assume Dean had been here often enough to recognize the general feeling.
Heaven.
And he was utterly alone this time. No not alone. He realized with a sudden certainty that the little spark he had first assumed to be a gleam of sun had a very familiar feel to it.
And suddenly he knew what had disturbed his peace, as his soul recognized the tiny shard of Castiel's Grace.
He didn't know what he had been expecting, if he had assumed that Castiel would be standing here in Jimmy's form, waiting for him to finally enter heaven, this time for good.
But Castiel wasn't here. Not all of him, at least.
As the memory of Castiel flooded him and reminded him of moments he though he had lost, he wondered how long he had already been here. It seemed that the soothing peace in heaven was slowly erasing all the darkness, all the fear and doubt and shame and guilt. And although it felt amazing, Dean had a hard time recognizing himself with out those feelings.
Slowly Dean began to understand that it would just be a matter of time before he would no longer remember being alive, before these peaceful memories would be all he knew and remembered. Dean knew he only had so long to find Sam, to find every last atom of Castiel.
And just then he knew that he would spent every moment of that time looking for every single atom of the Angel, every last spark of his Grace. And then not even death would keep them apart, they would cling to each other and be joined so tight.
And so the last piece of consciousness that had been Dean Winchester joined the sparkling shard of Castiel's Grace and set out and his last quest under the brilliant stars, determined to find the atoms of the Angel who, had he been a human with a human soul, would have been Dean's soul mate.
Because Dean knew that soul mates rightfully belonged in the same heaven.