Jim tended to smile a lot about things that excited him, and around people who made him feel comfortable and at ease. Caduceus just happened to have this mood about him that made the captain relax, and even unaware that he was doing it right now, it was likely that he was going to be doing a lot of smiling around him.

"Ah. Yeah, that— makes more sense," he laughed, fingers running through his hair as they both started to make their way back to the city together. "I thought you meant you needed to go there to get coins for some reason. Sorry. But anyway— let's try the tea they've got and you can tell me if what you can usually find is better than that."