Maybe it's a question asked when a character shows up where they weren't expected, perhaps hinting at a mystery or an odd situation within the Christmas narrative. It could be a way to start a conversation or to prompt an explanation.
Well, it could be that the teacher is organizing a fun activity for the kids or reading them a bedtime story. There are so many possibilities depending on the plot of the story.
The teacher being here in the manga might be part of a planned storyline. It could be to introduce a conflict, provide support to the main characters, or to drive the plot forward in an unexpected way.
Well, to determine if we're doing it right here and now in the manga, we need to look at the consistency with the established storylines and the goals of the characters. Sometimes it might seem right, but on closer inspection, there could be hidden issues.