[Again: were the circumstances different, he would enjoy this - the challenge in and of itself; that Ciel throws those challenging words right back in Sebastian's face... And really, the excitement he feels isn't entirely non-thrilling, born from anger and possessiveness though it is (when it comes to anything that makes him want to get even, the line between anger and pleasure is somewhat blurred for Sebastian).]
Quite, young master. [Proving he's a servant of Phantomhive calibre? That he can do blindfolded with both hands tied. However...]
Will you leave it to me to determine how best to do that?