Stone tilts his head so his good eye can see Prompto, and quirks a grin-- his face, for all it's black and scaly now, is still mostly human-ish and can make normal expressions. The teeth are kind of sharper now, though. He can't answer aloud with more than an amused rumble, but hopefully the expression and said rumble is a good enough yes.

Now that Prompto has gotten used to things enough to apparently enjoy it, he dips one wing and drops into a quick (and additionally stomach-dropping) turn. Enjoy that, kiddo?