Theo had satisfied himself that Greg was there and then looked around to make sure he was still in Greg's head.
It all seemed okay, so he curled back up on the bed, his head ducked down towards his chest with his arms up over it protectively, as though he was waiting for something to come tumbling down.
He didn't fall back to sleep but started singing something softly, more spells that he couldn't cast; he felt like half a person without his wand sometimes.