Astarion Ancunín

He can feel how comfortable Astarion is which is very different from the resigned terror of Arthur making such an insane jump. That's why he doesn't yell or scream or complain; instead, there's something utterly delighted to feeling Astarion manipulate the Weave, use his magic and his talents. It's a little like listening to Arthur recite poetry or the few times he's heard him play the piano. He's silent, just soaking it in and enjoying it for what it is.