Clint & Duma
Well, it wasn't like Clint hadn't seen wings before -- Archangel (or was it just Angel? Look, Clint didn't really keep up with the X-Men beyond Wolverine) had them, so did ...uh. The Vulture? A few other mutant types too. And Sam. But his weren't real.
But he'd never really just seen any pop up in front of him and he'd never been invited to touch either. So, duh, of course he reached out to brush his hand over some of the larger feathers. "Wow," he said out loud, a bit gobsmacked.