"Why?" Cas asked innocuously. "Angels have been known to mate before, though it is very rare and happened less and less by the time you came to know us. The process would be very different from what humans perceive as such, were the two of us still fully imbued with our powers.
In regard to Dean's second question, he didn't know. "There is a control room, but it is not on either of the decks that we have access to. As for the crew quarters, that would leave determining which of these beings are actually crew. Others seem interested purely for scientific reasons. Which is troubling in and of itself. Seeing as they have no fear of us, that should be a concern."
He shook his head, checking around their next corner out of habit. "I've neither felt the presence of or seen either. Rose is also one I have yet to make contact with."