It's NTR for all practical purposes. Don't need to know the details, but girl getting off on getting her blood sucked by vampires while all kinds of plot armor keep the protagonist from saving his perfect woman is NTR.
But....AllenAllenAllen333.....isn't legendary history that fits the plot and makes for so many good quotes not better than actual history?
After all, I've read many actual historians whose histories neglect actual recorded events in favor of "legendary" explanations....😎