It was, perhaps, not polite to just appear in someone else's home however human manners weren't exactly something Duma was well versed in. And knocking would have been silly anyway. What was he going to do? Answer the 'who's there'? He couldn't. So he had popped in and was delicately placing a toy skunk on a table with an elegantly written name card. He did not know if Castiel lived with the Winchesters but knew it would only be a matter of time before he popped around again.
Then he turned to watch Dean as he puttered around the kitchen. A dinner invitation had been the last thing he'd been expecting but Duma at least knew it was impolite to turn down such an offer. Did he drink? The question threw him for a moment and he searched his pockets for the phone he'd been given. "Whatever is fine - except for the beer, thank you," said the mechanical voice of his text-to-speech. He hoped Dean would be patient with him and the little machine. "What are you cooking?"