Ellie glanced around at the sound of another entrance, and blinked in surprise as a Hellhound disguised (very well disguised, she amended) as a small flop-eared dog accompanied a disreputable-looking man with a very unusual aura into the room. Neither seemed inclined to disrupt Aziraphale's reading, and the man had a look about him of someone who preferred to remain unnoticed, a sentiment she understood very well.

So when he shot her a covert look (hmm, pretty eyes, she noted in passing) and immediately dropped his gaze again, she smiled slightly but let him get away with it, turning her attention back to the story without comment. She could investigate later. For the moment, she kept the peculiar pair in her peripheral awareness the same way she was Hermes, content to live and let live as long as nobody tried anything funny.