@Vasqueztion As I've mentioned earlier, I am aware of this discrepancy. I've consulted with multiple native speakers on this matter and every single one of them informed me that "master" is the appropriate use case here.
So... is another possible reason he didn't want to do her in the first chapter, aside from baby apprehension, fear that she might slip, resulting in him being stuck in a fox?
Oh man, that brings me back!.. And I agree, it's a nice warm fuzzy feeling when you realize an old school game/toy is still popular in some shape or form, cross generational play!