Eh, like it takes Hikari reaching out for her to pull herself out of her spiral & she's currently being too cowardly to face Hikari. Yuu's the easy one b/c she expects him to not call her out on any of her behavior b/c he never has.
On the contrary, it's Yuu who has most often reproached Yami and openly called her a liar, ever since that night in the love hotel in chapters 24-25. However, he has always been submissive and faithful to her wishes when he feels she is sincere and honest with him. Yuu is disposed, or he was, to follow Yami to the very depths of hell, which is why Hikari was so amazed by "Yami-sama's true story".
Hikari, in any case, is the one who has LESS OBEYED Yami. Of course, she is not Yami's submissive, Yuu is Ayami the dominatrix's submissive boyfriend. But there's a reason Yami said in chapter 45.5 that Hikari is the one who has reproached her the least and that she's still astonished that Hikari never blamed her for anything.
But yes, I already figured you wouldn't like that, just as I predicted, Yami would always prefer and choose Yuu over Hikari. Even if she, as usual, is too cowardly to fully admit it to herself (like in Yuu's omake 4 when she started pacing around when he began asking her "Yami-senpai, what are we?" like the girl in the relationship that Yuu who is).
?? Hikari is the character who femcels would typically identify with - the self-sacrificing good girl who lost out b/c her crush went for the first girl who threw herself at him
Yuu was not the crush of Hikari when Yami who threw herself at him. In any case, this is "the toxic ex-girlfriend of my crush forcefully kissed him before my eyes, and she was my classmate all this time and she said she was disposed to accept I would date her ex-boyfriend".
I think if Aya and Yuu do get back together, that's just the standard "I can fix 'em/love heals all/broken bird" trope.
Not, this is the "she is the boyfriend of this relationship" trope.
For those interested, I think we'll see Hikari either opting for polygamy or making Yuu choose between her and Yami. There are already several precedents for this in rom-coms.