Samandriel is silent for a long, long moment before he answers, quiet and almost ashamed for even offering, "If you wish it, either or both of you, I can remove all memory of what happened. I don't have the luxury of being able to do that for myself or for Lucifer or Castiel," There is no world in which Dean would consent to that so Samandriel doesn't even bother making the offer to him, "but...if it comes to it, healing at least that psychological damage is in my power to do. Possibly, I could remove myself entirely from your lives and your histories, but no matter that I feel like I should, I know that neither of you would consent to it." And so he won't.