He watches the exchange between Irene and 'Amanda' with a subtle sort of curiosity. There's something a little bit more to that smile, which isn't something Charles is used to seeing in same sex interactions.

Once he takes his coffee with a quick 'thank you' to the waitress, he addresses what Irene said. "It seems to be. Unfortunately I've recently become very tired with staying content. Twelve years in academia will do that." And he gives a little smile at the joke before taking a sip.