Theo knew he'd have had his ass kicked by his father for embarassing himself like that; he should have been controlled enough to not pull his wand on Greg once he'd grasped the situation, but he supposed that all this hanging around school without hexes strung up to jump out and surprise him had blunted his skills somewhat.
"Don't worry about it, I shouldn't have let my guard down." he said easily, sitting back down on the bed and retrieving his book, dogearing the page before he closed it. He watched Greg strip in front of him but nothing about what he might have been thinking showed on his face. "Been out?" he asked.