They are absolutely perfect for each other; they share one brain cell.
But for real I really hope they stay together. She seems really nice, even if she's a bit out there.
Now that people mention potential future kids I wonder if half yokai differ in any way from regular ones in their universe, since that wasn't really explained in the Tanuki arc but going off O-yome san manga with their half kitsune son is mostly human with him looking more vulpine during...