Dear Cas,
I've started writing this with no idea of what I'm going to say. It just seemed right. I'm leaving in a few minutes. I know you're against this but, Cas, it is right. I hope you find this letter. I'll leave it somewhere obvious.
I know that you know, Cas, but I don't think I ever said it out loud, and now... Well, now I'll never get to. So if I can't say it, I will write it down. I love you, Cas. I like the way that looks written down. I love you, Cas. I love you. I love you. Anyway, in case I never come back, there it is.
One more thing before I leave, I am so sorry. I'm so sorry I broke that promise. You know which one I mean. Sam will keep my promise. (I promise). I've left him a letter too. With yours.
In case you never get your mojo back, live a good life Cas. You are good as a human. Don't lose yourself. Find a wife or a husband or someone who will make you happy and start a family. Or be a hunter. Just don't give up. Be you.
Okay. I'm going now. This is getting cheesy and I'm going to think about not going.
And for the last time, probably ever, I love you.
I'll see you again, one day.
Yours eternally,
Dean.
Hey Sammy,
I don't know if you read Cas' letter or not but in case you didn't, I made him a promise in it. I told him you would help him get his angel-ness back. Please do that for me. I think you would anyway but I'm just making sure.
You already know everything I could write here and I know exactly what you would say to me "Dean you're being stupid" or "You don't need to sacrifice yourself". I do though Sam and I hope you'll forgive me. Knowing you, you won't.
You and Cas will be up soon so it's time for me to go.
Bye Sam, I'll miss you brother.
Dean.
P.S. Don't blame yourself for this.
Dean,
Like you did, I have begun my letter with nothing to say. It felt right to write back to you, even if you will never read it. I loved you too. I LOVED YOU TOO.
You didn't need to do this, Dean, you really didn't. We could have worked this out.
Oh, Dean. I'm so sorry. My words cannot tell, not even in part, of the debt that is owed by me. I gave everything for you Dean. Everything. But I never once imagined that you would do the same for me. How could I know? How could I possibly understand when you kept yourself so… locked away.
I know of only one way I can see you… But I'm afraid, Dean. I'm so afraid. I love you. I guess it's because I love you that it is the only way. It seems… almost ironic that it would end this way… after you gave me life, taught me how to live. I love you, I love you, I love you.
I'll see you soon.
Yours, forever and always,
Cas.
Sam,
This wasn't your fault and I'm sorry.
Goodbye.
Faithfully,
Castiel.