They're both talkers, is maybe a fairer assessment, as Daniel opens his mouth for any number of replies:

You fascinate me too, the feeling's mutual.

My mouth is always at work.

He silences them all by doing exactly what he's told, some part of him grateful for the instruction posed as permission, or the permission posed as instruction. His open mouth sinks down, taking as much as he can without having to test if he redeveloped a gag reflex or not.