[You say "accept" like he'd ever turn down being given a kitten. He is, by the way, gently petting said kitten while they speak, so chances are he does indeed accept it. After, say, half a minute of just that, Sebastian seems to have recovered enough to look mildly thoughtful instead of just blissfully happy, and he tilts his head as he looks at Lucifer again.]
Why, sir?
[...Yes, he did just ask that, and admittedly Sebastian isn't at his smartest around cats. But this is a different "why".]