It seems that Mai is treating my non soulbound character like they have bound themselves to Kerros in the Patslut (belly) scene because they refer to the character as "Yer Eminence" which, if memory serves, is only if the character becomes Kitsune. I only knew "Yer Eminence" was a thing because of other testing and hadn't seen it in my normal playthrough (which isn't bound) until I came across this scene. I saved and bound myself just to check and the scene is identical. This is all on the Steam version.