Castiel would be more than willing to eat a sandwich. There was very little Cas wouldn't do, if Blake asked it of him. And eating was something easy. He leaned in and kissed the man, though, when he said the angel didn't have to eat, he could just sit with him while he ate. That Castiel definitely could do. He was used to that.
"They might be? It's likely a different world than your New York, though. So I'm not sure." He would like to meet more of Blake's friends, though. More than Stella. Though Stella was the most important, obviously.