Va understands Vash perfectly, but doesn't really advertise that often. Instead it's just happily purring for the boy as they walk, letting that little hand stroke over the softest, downiest fluff. Petting soft things made you happier, and it's very happy to provide some much-needed oxytocin.

When the plantling reaches over to show his little hand and attempt to grow feathers, Va makes a little worried-sounding chitter and curls up tighter around that neck - not to choke him, but to shrink.

Looks like it does not like a little boy knowing how to make feathers. Feathers on a plantling sounds wrong.