He doesn't know enough about real birds' wings to know the difference, his assessment is more primitive, automatically categorizing weakness that someone might choose to exploit. It's interesting, it's soft, and if he burrows his fingers in its warm. But it's also utterly without any kind of protection, no hidden scales or scutes or claws buried in the feathers. "Huh."

No voice. So it's more like.. a changed default state than a new demon?

Eventually he lets go, frowning. "I don't like it, that's a lot of new targets." Not a matter of appearance, that part was fine and he wouldn't really mind seeing how far the feathers went.

At least there was still Varuna. Serph wouldn't BE defenseless, and anyone underestimating him would find out how badly they erred. "... It looks okay," he adds with reluctance. "Sera's seen it yet?"