Celine worried about Rumi's development decides to allow her to indulge in some of her demon trait/ needs with some conditions and limits.
She looked more demonic when she was a child, horns, fur, fangs, claw and tail. She learned to hide but she was allowed to slip in her demon form a few times in the week as represing everything takes a toll on her.
Growling if she is stressed or angry? Purring when she is happy or to soothe herself? It passed as a weird vocal warming.
Nesting? Just wanting to be comfy.
Possessiveness and territorialness? well she is an only child.
Play fight? is just training. Rarely, very rarely Celine will allow her to show her fangs and claws sometimes her tail and horns. Depends on how well Celine's mental health is that day (so almost never)
Hunting to provide?, she grew up in a farm/ secluded island. Celine teaches her how to hunt with weapons and not claws, she also teaches her how to prepare the meat.
Eating dishes with raw or almost raw meat? Famous people are weird like that. Celine investigates and learns to prepare recipes, later teaching Rumi how to do it.
Bloodlust towards her enemies? Celine smiles because that is a perfectly normal hunter and idol behavior, she is like "here have my sword" and proceeds to massacre the fools that dare to cross them.
When Mira and Zoey arrived, Rumi developed others needs and behavior, very specific and very familiar. Celine just sighs because of course her niece daughter would fall in love with her teammates, just her luck.
She needs to know where they're. An ambush could happen!
She waits for them to eat first before even picking her chopsticks. Zoey sometimes forgets that the eldest eats first and Mira doesn't care abot rules she is hungry.
She needs to smell her scent on them. Sharing clothes to helps to improve their bond
She needs to have them in her nest. Sleepover is another wonderful way to bond.
Buying anything Zoey wants?. Can't you say no to that face? That's what she thought.
Giving Mira precious or cool rocks she finds? Mira already collects it, sue her for helping.
Growing their favorite flowers? Well some touch of nature in their room is good for their mental health.
Keeping her hand in their back or waist when they hangout? She is the leader just keeping a eye on them.
Rumi's weird behavior was just one of the many things Zoey and Mira got used to.
Post movie she is more daring and forward with her behavior, touching skin to skin so she can effectively scent them, using their clothes etc.
Rumi knows that her behavior is courting, but she can't stop. ZoeMira don't mind it most of the time and they don't understand what she actually means.
Until Jinu, reformed demon twink and new addition to Rumi pack, trying to redeem decides that as the closest demon kin that Rumi has is his duty to give them a stern talk because how dare they to ignore rumi courting.
Zoey and Mira: what the hell are you talking about??
Jinu: her numerous attempts at courting you? You two just brush her away with a dry thank you! No wonder the poor thing is so anxious!
Zoey: what? Courting? US?
Jinu: Because she didn't sold her soul, Rumi enters under the category of Born demon or native demon, like you hunters already know.
Jinu: So her attitude is more feral, I admit she has blended them well.
* Proceed to explain Rumi peculiar behavior*
Zoey going through her notebook titled "Rumi and her ruminess".
Mira is reviewing years of knowing Rumi.
Jinu: obviously her way of showing interest is different from humans and demons that sold their souls.
*Proceed to explain every single thing Rumi has done for them and to them*
Zoey and Mira are rebooting.
Rumi is exposed a second time by Jinu and this time she will kill him