Look more fanservice. [Cause Ciel smiling is totally fanservice.]
Teehee...in canon, he was trying to join a circus troupe and...the last test they have him was to give them a smile. xD;; And that was it. And so he was called "Smile" for like that entire arc. *Random back story* So...it would be very exciting if he was called something amazingly embarrassing while in the club~ >D