I took that scene as more evidence of Serena Joy being much more traditional and fundamentalist, even extreme, in her beliefs. The both come in the room all hot and bothered and he's ready to go but she says "shall we pray" or something like that and he's like, uh, sure, yeah. Of course, he knows all the lines, but…

Serena Joy made sure to word it so that is sounded like oranges were so commonly abundant that she might not even know whether or not they had any in the house. Of course they'd probably made certain to stock up with things to make it look like everything was bountiful, but it's like in old movies when the lady…