[Dean doesn't even register the word fair. It's not fair, because Stiles knows more now than he should, and there's no way to guarantee that knowledge stays where it should be: with Dean. And it might be true that people deserve whatever warning they can get, that maybe they'd listen to it coming from Stiles if not from Dean, and that Dean himself had this same potential to spread the information through the same means.

Promises are great. Promises were currency, once. Promises mean precisely nothing to him anymore, and so he glances up from the glass and does the only thing he knows how to enforce discipline: by making consequences for failure clear.]

You realize that if I hear something I know I didn't put out there, and I can trace it back to you, I'll kill you right? [This is not hyperbole or exaggeration, nor does he put any kind of emphasis on it. It's just what will happen, signed and sealed.] I don't really care if you come back, but it won't be pleasant.

Just making sure you understand where we're at.