Castiel's no slouch in the height and weight department, or the muscle department. But Sam's just bigger over all and hugs from him tend to be pretty all encompassing.

He shakes his head. "You didn't fail, Cas. Hell, there are people who have been humans all their lives who end up in the same sort of situation." He reaches up, resting his hand against the back of Castiel's neck. "What happened there, the failure isn't on you. It's entirely on him. But we'll make certain it doesn't happen again. Now that you have an idea what you want, we can go the right way about it. Teach you about the things that you might want."