Ernie didn't know what was going on in Theodore's mind right now, but he almsot wished he knew legilimency so he could find out. Though he'd never invade his friend's thoughts like that, not without permission.
For a brief moment, Ernie worried he'd done the wrong thing when Theodore reacted to the touch, but then he moved closer. Ernie sighed in relief. Whatever was going on inside of Theodore, he at least recognized that Ernie was safe, and the significance of that wasn't lost on him. He only hoped he was worthy of it.
"You're welcome," he said softly. He lifted one arm onto the sofa cushion, moving around Theodore but not touching as if making a nest available that his friend could turn to if he so chose. His other hand moved up, taking a chance and brushing back some of Theodore's hair before gently touching his cheek. "I meant what I said. You're safe here. Nobody can hurt you when I'm here, all right? It's a promise."