Seems like this entire plot would be over pretty quickly if Kase just told Fukami she was moving in with her girlfriend.
Ikr? But what if Fukami will be like "I don't approve of her! Have a race with me and if you lose you two should break up" Lol
I mean, as much as Kase respects the hierarchy like a proper sport student, even if senpai would back Fukami again, this would be the point where she would just tell them all to take a hike. She may have screwed up a few times before, but that doesn't mean Yamada is not the most important to her at the end of the day, and any such demand will see you shut out forever if you don't make a very sincere apology, possibly to Yamada as well.