Aiden's forehead wrinkles just a touch in a hint of a wince at the undignified name of the chimera.
"Well, we are glad that you, and, er, 'Monobrow' are with us. We will need to track down your mortal origins to properly cover your tracks, as it were. It would not do for you to grow up without proper documentation, as we really must enroll you in school and ensure proper transcripts, and such. One mustn't ignore the mortal end of things, it is half of our being, after all."
That said, he dismisses Noirin with an actual pat on the head. Friendly like, but as one might a favored horse or hound.