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So as I am writing Saint and while doing some looking into Kitsune folklore I came across the legend of Tamamo-no-Mae.
Tamamo-no-Mae was a nine tailed fox who seduced an Emperor and made him deathly ill before being found out and driven out of the palace. That is the bare bones of the myth and there is most likely more context to it. It is also believed that Tamamo-no-Mae was also related to two other incidents with royalty in both China and India.
As I was reading about it my brain went, Kitsune!Suguru would do that for fun. Now all I can think about is Suguru just messing with multiple countries for fun before meeting Saint!Reader.