Ciel had a 'stutter-that-he-only-had-around-Sebastian-and-when-Sebastian-was-saying-something-romantic-to-him-on-purpose'. So he learns to keep quiet whenever his butler turns romantic. Which is, to be honest, all the time. Never being able to hear Ciel's voice begins to upset the demon more than he'd like to admit and eventually moves him to action. SebaCiel Three-shot. XD Enjoy!