AN: Hello! This just got to me while I was reading Gakuen Alice Manga. The manga got me tearing up and well, I just wanted to share the feeling. Killing. This might appear vague but I hope you'll figure out what Castiel had done. :) I don't wanna spoil it for you. This is my take on the ending of the show. After everything's okay and hopefully, God will be back then.
The End
It was almost fitting that he had done it in Spring. A new beginning. He had a feeling that somewhere, Fate was mocking him—he did intend to kill her before. Perhaps she never got over that.
Dean had been angry when he realized what he was about to do. And quite frankly, Castiel was almost glad that he will never witness once more that kind of wrath from the Winchester. It was their reward, for everything that has happened. God was willing to give them a chance at happiness, at life. And Castiel understood that, he really did. He only wanted the best for the Winchesters. What he still didn't understand though was the clenching in his chest. The occasional breath-constrictions he would have called it—if he were still in a human vessel that is. But even in his true form, it followed him. Almost like an ache…an abyss he couldn't fathom. Quite like the human saying "I can't quite put my finger on it."
Unlike Dean, Sam seemed to understand. But he was looking at Castiel in an odd way… like he understood but still didn't understand. Humans can be very complex. It was taxing for him to figure out their emotions.
He had to make Dean unconscious to do it. The usual finger-tap on the forehead. Why wouldn't the hunter just let him? It was God's gift to them. Didn't Dean want to be happy?
And why was he secretly pleased that the hunter was fighting it?
He was finished with his final task on earth. Now, the world will continue on turning, without a trace of the apocalypse, of the leviathans, of the angels and demons. Dean and Sam Winchester will be blissfully oblivious of what had happened.
And Castiel… Castiel will live on.
Fin.
Tell me what you think? I hope you were able to distinguish the Destiel subtext here. If you were able to, you'd probably be pulling your hair right now. Hahaha =)