Castiel's favorite thing about coffee was not only the bitter taste, but also how it had a odd way of being flavorful. It burned his tongue, but it was a kind of burn that he actually savored, despite how it would normally be a point of discomfort in others. When Meg began on her coffee, it prompted him to do the same, before looking at her with a hint of interest in his expression.
"How do you like coffee?" Even though they were both quite old and they were aware of that, he wasn't actually aware of how long Meg had been a demon. He assumed it was at least a couple of millennia, although she had a way of referencing popular culture much like Sam and Dean. It was things that went over his head, not catching most of the references, but he knew they were rooted in current or most recent culture, rather than the time she originated from.
He busied himself with the eggs next, not bothered by how they were slightly burnt, although there was a brief moment he seemed to let the burned portions pass over his tongue and there was a small grimace. Nothing worth truly noting, because he had no idea how to prepare eggs on the whole. It was a wonder he managed to work the toaster and make some toast the other day, without the kitchen feeling the brunt of that.
"You're... not holding my hand. And I don't know any Donna Reed." Another reference to something that was lost on him, but it was expected all the same.