With a small noise, the hook holding Gray's cloak came undone, and out popped a
small bird-cage looking object. From the inside of that cage, Add slipped his opinion in
with a smug expression.
"That lady is scary, right? Even though I was properly hidden and everything, it was
the first time I came so close to being found out!"
The eyes and mouth engraved on the box inside worked busily.
It was a bit of a recurring thought, but seeing Add move like that reminded me of the
CG you see in movies. The expression morphing bewilderingly on his face was so
overly detailed it was like it was trying to express a different opinion than Add's itself.
"Touko Aozaki?"
"Yeah, that one. The hell is she, some kind of monster?"
"In that case, the fact you weren't found is actually quite the feat."
Probably because Add's concealment was done entirely without the aid of magecraft.
That might lead one to ask why such a paper-thin defense was set up to keep him
hidden, but both Add and Gray were silent on that front.

The Case Files of Lord El-Melloi II, Volume 2, Chapter 2