Another puzzle piece clicks into place inside of him at the sound of her voice, and like a trained dog, he answers right on cue.

"Master?" The word leaves his lips before he can stop it, seemingly natural in that moment, but almost immediately Jekyll comes back to his senses. "I mean—um, please forgive me, I don't know why I said that."

He's flustered enough that it hasn't quite sunk in that she already knew his name before he could introduce himself.