I'm a compulsive forum browser, but I tend to not say anything unless it gets to me in a really positive or negative way. Some topics I find quite bland so I don't bother, VK was this way until 89 then I had A LOT to say.
Although I always prefered Zeki over Yume, I always told myself that in the end it would be Yuuki who makes the decision based on whatever transpired through Hinos depiction of events. Everything is cool, then at 86 the Zeki swing got going (again) by 88 page before last you were really left with "It's gonna happen" and then Kaname (insert troll face + trollololol music) stops the festivities. Okay, I'm cool with this because in some ways the men will always fight and the woman will be indecisive. I understand she has hurt Zero in multiple ways and I dislike her for it, but thats plot and portrayal, I get on with it.
Then 89 ... I think it was said that VK could have started at 88. Forget the other 87 chapters of story. Yuuki beds Kaname under the pretense of what? Do I love Kaname or Zero more? I obviously need to do something to confirm one way or the other ... Ehh?! Grow a spine woman! Confusion or insecurity aside, this is a primal desire, sex, with which one is connected to the other (lets leave out the whole blood/blood of vampires) where both understand each other. Yuuki doesn't understand jack. Let alone this desire.
I push blame towards Kaname insinuating in a manner that lead to Yuuki making a decision based on actions she has yet to fully understand. I'm forcefully making myself think that 89 was just a troll chapter, not just because of the sex scene, but because of HOW it came to pass. The fact it happened is unmitigatable. The facts of how it happened are not even subject to scrutiny or misinterpretation. To me, it is just downright dumb. I want to say it feels like a scene out of an NTR hentai but I'm sure I'll get blown to bits for even considering it ... you know what stuff it ... here we go.
In the worst form of NTR, the female is pushed into a situation she doesn't want because of circumstances that she feels she is unable to fight. Any woman with a backbone could easily get out of these however the NTR genre leads us to believe the female is incapable of doing so. Oppressed and subjugated she cannot escape.
Lets put this into VK and Yuuki. Her oppression begins when she is turned back into a vampire. She now has the responsibilities of a pureblood and is now the fiancé of Kaname. The feelings that grow from this, under the genre of an NTR are progressive, very similar to how she falls for Kaname from my POV. Her subjugation is brought about when she is forced into situations she cannot control. Presiding over the nightclass because of Kaname, before 89 she was hellbent on killing him/and or turning him human, having to remove herself from Zeros memory because when she dies for Kaname his thirst will only grow and be unsatiated. The theme going on here? It all points back to the originator, Kaname. Now NTR is about stealing the female from an already exsisiting relationship. Plutonic or not, Kanames words are "the feelings he has for you, weren't part of my plan" so a relationship did exsist between Yuuki and Zero, any fandom could see this, I'm not talking about love or any level there of, it still exsisted as a relationship.
So that is my take on it, deep as it is and as far out of the ordinary it is also, the layout of the characters and the way in which the story has unfolded, leads me almost too clearly down this road.