Sam | Lucifer
In heaven. When Michael and I were creating things. Lucifer, Lightbringer, Lamplighter, Morningstar - those were all just titles, what I did.
[...]
Well, that's fair.
But if - and I do mean if - I were to do anything to him or someone/thing else here, I'm pretty sure you'd know about it. At the very least, Gabriel would probably feel it. Castiel and Crowley too, most likely.