What's, in your opinion, thing that must have happened within their own context, but regardless, would be unexpected to see? For me though, since Yuyuko is the manager of the Neitherworld, there should be a scene where Yuyuko, as she is, sitting down on a table and unironically do paperwork and other bureaucratic thing. (glass on optional)
For more, Mokou learning etiquette, and Tenshi being adorable.