Theo gave Greg a questioning look as he said his name and then made a face at the very idea that he'd throw up on his bed... and not be able to clean it up afterwards; that's what Scourgify was for.
"Mmm." he said in response to Greg's decision, not expecting it to be upheld and not even batting an eye at the hand on his leg, passing the bottle over.
It took him a second or two for him to catch up with the conversation his roomies were having. "What's the point?" he asked, purely curious. He wasn't getting surly yet, this wasn't that Russian Firewater stuff after all.