Great work with the translation as always. I feel like this giant fox form is the payoff for the tanuki fight earlier. It serves it's purpose beatifully. 
 Also i think that the fox waifu being a monster that enjoys a challenge and has pride on her powers, probably won't chastise the husbando too much, probably she does feel proud of having him. 
 To think that this started from a man that went to the mountain to kill himself to this. 
 I feel like love can be a super strong force for people to evolve and grow.