[Hehe. It's maybe hard to tell since Sebastian is so smiley in general, but he's amused.]
I have never attempted to work out such a thing. [He knows already that he wouldn't break a single bone.]
But the rest sounds... mm, perhaps somewhat familiar.
["See, I'm not allowed to trash talk my master's social gatherings or those of his associates". The chocolate goes down again, if it wasn't obvious Sebastian agrees.]