Been thinking about my harem au today. Gonna call it Incorrigible Scribbles. It's such a fun little idea that's kinda grown, but probably isn't going anywhere either, writing wise. I'll rant about it though XD
Y/N is the type of femme fatale mistress whom revels in their villainy. They love being the antagonist, and loves having the vampire brothers wrapped around their little finger. Think Hot N Cold, Cold As Ice, Exs and Ohs, Everybody Wants to Rule the World, I'm the Bad Guy as good song descriptors for their personality. Though they're also really adaptable when it comes to playing with the heroes of their stories, they can be both flamboyant and secretive/coy.
Each of the boys' relationship with Y/N is unique in some regards. They are all undoubtedly intrigued/head over heels for their mistress, but each has varying levels. The biggest simps are Sun, the Blood Moon twins (Mesminax and Penatax), and Lunar, Sun and Bloody boys being the least chill about Y/N. Eclipse is the type to act like he despises the position him and his family are in, but he's truly infatuated with Y/N. Moon is the shy, introverted cinnamon roll in this, easily flustered by Y/N's advances, which they find adorable.
Solar is the most distant of the group (for good reason, future lore wise). Remmos (Ruin) is usually Y/N's closest plotting confidant, aside from Eclipse, but the latter tends to be more snippy. Klycis (Kill Code) is very much the proud big brother personality, and main protector, within the group.
The premise is that Y/N is a being called a Storyteller, one of a couple handful that make up a council of sorts that maintain the multiverse. They come to be with each of their unique type of universes, where the story must go on or it will literally wither and die, and they are tasked with writing out said stories. They all run theirs how they see fit, but there are certain, very strict rules they must abide by. Getting attached to those in their tales is heavily frowned upon, except for where it is required for their stories to keep going. That is how Y/N can be so casual about the vampire clan, because they can cycle through each brother in different eras as they see fit (ie. when Y/N decides on violence, Blood twins are top dog, building up espionage during peaceful times, Eclipse prides himself on his manipulative cunning). Of course, mistress Y/N also cares the least about the council and just loves having fun as the villain, which does not exactly put them in the rest of the Storytellers' favor.
So yeah. Throughout the many, many years Y/N keeps their universe going, even before they rescued the boys, they've chosen a hero and gone through various different cycles and archetypes. Loves to switch things up every time to avoid becoming bored, and very much enjoys having the vampires at their beck and call to help them along.
That isn't to say things would keep going like that literally forever. Y/N would like to believe it would, but someone among the Storytellers has other plans for the multiverse :)