After a moment he seems to deflate, but it's a bit more than that. Crowley's right, of course, and sometimes it helps to get a reminder of that. Even if death doesn't count like it used to, it's no good to thrust himself at extreme danger.

John reaches to clasp Crowley's hands, takes them from their current task and pulls them around him so he can relax back again.

"Let's switch places. You can be human again and I'll be the demon." Crowley can have the feelings and Blake will wield the power (although, he's left to wonder if that means he'd feel a pull toward the dark side, or if it wouldn't really matter.