Dean's watching Cas so when he turns around and promises his blood, it's this suddenly eerily intense promise. Dean blinks.

"That's one of the creepiest things you've ever said to me, Cas." He lifts his eyebrows. "And you've said a lot of creepy things, so A plus."

Not that he thinks the sentiment is creepy because it's like, supply gathering, only in the saddest possible way because he still hears crazy Cas saying how happy he is to bleed for the Winchesters and it's fucking gutting. Here he is again, offering up his blood to keep them all safe. It's easier for Dean to make fun of it.

"Alright, we lay low. For now," he adds, confident at first but then his expression turns questioning. "It's a small town, right? That can't last forever."