[Oh gee wiz, Pearl, Ciel's pretty much the opposite of a gossip. He promises to keep the information for his own nefarious purposes if she breaks down and shares. Either way, he can tell by this point that he won't get anything else out of Pearl. Definitely a wash.
Ciel does smile at Pearl though, this one small and a bit more genuine, at the comment about staying out of trouble.]
You sound just like my travel companion. I'll be careful. [Except, Sebastian is more on the 'don't get caught with trouble' camp than the 'stay out of trouble' camp.]