[Very icky. In Sebastian's case it's more... well, in that other life he used to be human. He supposes it makes sense that he'd experience more human-like emotions. Whatever he felt in that life has nothing to do with who he truly is - it's not so different from the other times this world has forced alien, human feelings on him. It's never a pleasant experience - goodness knows he's learning, first-hand, how much of a hassle being human must be - but in hindsight it's... curious? A learning experience, certainly.
He does take offense at having control of his own mind taken away, though. At being stripped of his powers, at being rendered too weak to properly protect Ciel. Now that is worth burying oneself in work over.
Sebastian enters the office, tray in hand.]
Your afternoon tea, young master. Today I am serving Darjeeling's autumnal flush with a Manchester tart. [...Pfft.] Or am I perhaps interrupting your work flow?