Of course he'll have to explain this to Lucifer. What else was there to expect?
Well. Seeing as all Sebastian's feeling right now is rational, justified disapproval of this entire situation, and he's not the least bit upset, it's just as well that he does explain. It will make things easier later on.]
Sir, if I may, I will be frank with you,
[he says flatly, turning around to face Lucifer.]
But first a question, if you will: what exactly were you thinking - if you were at all - letting me go earlier?