[He can't help but roll his eyes, though amused despite himself -- he's forever proud of the way how Sebastian would disapprove so much of Ciel's use of the slang. Even if Ciel manages to make it sound like very high class British kid is trying very hard to mimic American movies.]
Wow, thanks. Are you always this free with your praise? [Hello irony, meet sarcasm.] It's a very particular style, okay, you stick to the 19th century aesthetic and I'll stick to looking like I'm not ancient.
[Also. Also please for the love of god.] ... Please never repeat that again, ever, my ears might not recover.
So that's a no. A very loud no. [Also not saying what his actual name is nobody needs to know.]