Castiel nodded and obediently toed out of his slightly-too-big shoes, nudging them to line up evenly on his side of the bed. "I watch the skunks, or the bats. I watch over you and Sam, sometimes," he said. He had to get up again to get the coat off. "Mostly I just walk. The streets are... quieter at night. Emptier." He did not look at Dean as he folded the overcoat neatly, setting it down on top of his shoes to take up as little space as possible. That done, he paused, shifting his weight around.
Dean had offered, he reminded himself. If he was intruding... well, Dean had never been shy about telling Cas when he was too much into his space. Still, even Castiel himself could tell how stiff and awkward he was as he climbed onto the bed and slid partway under the covers. He was unaccustomed to actually laying down, much less climbing into a bed.
He might have to do so more often, though; it was warm and soft and the whole bed smelled like Dean and clean laundry. He might not require sleep, let alone the trappings to make it more restful, but it was pleasant regardless. It made it easier to finally relax a little. Cas shimmied his way into the blankets, nestling in on his side so he could still watch Dean. He couldn't help smiling across at the hunter. "This is very comfortable, Dean," he said, "and don't worry, I won't need to 'hog' the blanket." He twisted an arm up out of the blanket to make the air quotes one-handed before burrowing back into the warmth.