He wants so badly to gently (fiercely) wrap his arms around them. Instead of risking shattering their brittle steel in front of others without permission, he draws up and moves slightly to shield Kaworu's face from any prying eyes. He continues to whisper,

"Back in your world, you were... taught for a specific reason. You're not the first person I've met like that. You don't have to do things the way you've always been told. You can make a better life."

He doesn't look at Paul in assent for fear of speaking his secrets with eyes already trembling like leaves. He closes and opens them, and they return to appearing placid and barren. The words are for him too.

"Don't worry about me. I chose this. I won't let you make the call I'm supposed to. It's not fair. The world isn't fair. Heroes fix that."