A hypothetical question (to all readers): if you are Ayako, assuming you don't want to corrupt your daughter, would you rather send her away to a boarding school, or not send her away and instead seek therapy together? The former probably risks that Asuka engages in self-destructive behavior and might even completely lose it, the latter risks your own safety and reputation. Or just what would you do in general?
I would seek therapy personally while maintaining a normative familiar relationship with my daughter. This after telling my daughter I don't feel the same way toward her that she feels toward me, regardless of whether or not I did.
As for my feelings on this story, I like it a lot. I'm rooting for a romantic relationship to happen.
In the real world, no matter how well intended and no matter how much both partners might want it, it's the obligation of the parent to not go forward with it, not encourage it, etc. Relationships in and of themselves can do harm and cause trauma, and this sort of relationship makes it all that more likely. You can be a good person and have good intentions while still doing harm.
When there's such a huge difference in power in the relationship, the person with more needs to be responsible and say, "Even tho it could turn out fine, going forward with the relationship would be selfish because of the harm it could do to the other person."
This is why even if you may personally know examples of teacher-student relationships or adult-minor relationships that turned out fine and happy, that doesn't make it okay to be a teacher who dates their student or an adult who dates a minor.
The reason a story like this is okay is because no one real is harmed. We can pretend the trauma won't happen, or that even if it does everything will work out in the end. We can, if the story is well written, rest assured that either we'll have a happy ending in spite of the relationship, or that the sad ending will have emotional value.
Stories like this are also appealing BECAUSE they're fantasies. I'm not attracted to my mom, but I love stories about this sort of relationship. I'm not attracted to my siblings but I love stories about siblings falling in love. People are able to call partners "mommy" or "daddy" specifically because they aren't their actual parents. Etc etc.
That's why I think worrying about the morality of the story is a bit silly. So long as you don't use stories like this or Yuzumori-san as an excuse to justify predatory behavior, there's nothing wrong with these existing.
Of course, worrying about the morality of the story is different from, "This is a sensitive/upsetting topic for me and I either don't like how it handles it or I don't like any stories that deal with this."
tl;dr i talk too much