Could be set on any of Dean's numerous 'last-night-on-earth's after he's met Cas. Disclaimer: I don't own any of these beautiful boys!

Simply another last night on earth. You've had so many of them that it's hardly even worth keeping track any more. And you think that, by now, you should be used to them. Or at least used to them enough not to have the same worries, doubts, fears. But, apparently, you're not. The worries still nag at you, the doubts plague you, and the fears haunt you. And they're always the same. They're always for Sam. The worry that he won't cope without you. The doubt that he'll be able to cope without you. The fear of what lengths he'll go to when he can't cope without you.

This time, though, it's slightly different. Of course, you still have the same worries, doubts, fears, but this time, you're more concerned as to whether he'll survive at all. You're going on a suicide mission, see, and none of you are expected to make it out alive. Except Sammy. Because Sammy's what the devil wants. What Satan needs. What Lucifer would do anything to get his hands on. So, of course you're concerned as to whether he'll be killed, but you're more concerned as to what will happen to him if he's not.

And there are new, different fears this time. Ones you're not sure you understand, for a person you can't comprehend. Well, not a person, really. An angel. Castiel. You have the same worries, doubts, fears for him as you do for your Sam, but there are new, different ones too. The worry that, when you die (the inevitability of the situation renders 'if' a null word) he will cope fine without you. The doubt that, when you die, he won't be able to cope without you – he's much too strong for that. And, most of all, the fear that, when you die, he'll will move on, as easy as breathing. That he will move on to another lost, righteous soul, that he will guide, protect, love another as he did you. That he will forget about you.

And that is your greatest fear as the dawn breaks on yet another last night on earth. That you will be forgotten. And your last rational thought before the bloodlust creeps over you is that, as altruistic as you appear to be, you are, essentially, a selfish creature.

Thoughts?
xx