A pair of siblings.
One male, one female. One aggressive and stubborn, the other soft-hearted and gentle.
Somehow, they got along well despite the differences in personalities.
He was her everything. Her friend, her playmate.
Her brother.
She was his best friend, listening quietly to all his words. The one person that cheered him up with the bright smile.
His little sister.
"𝓞𝓷𝓲𝓲-𝓬𝓱𝓪𝓷! 𝓦𝓮'𝓵𝓵 𝓪𝓵𝔀𝓪𝔂𝓼 𝓫𝓮 𝓽𝓸𝓰𝓮𝓽𝓱𝓮𝓻, 𝓻𝓲𝓰𝓱𝓽?"
"𝓞𝓯 𝓬𝓸𝓾𝓻𝓼𝓮, 𝔀𝓱𝓪𝓽 𝓶𝓪𝓭𝓮 𝔂𝓸𝓾 𝓽𝓱𝓲𝓷𝓴 𝓸𝓽𝓱𝓮𝓻𝔀𝓲𝓼𝓮?"
"𝓟𝓲𝓷𝓴𝔂 𝓟𝓻𝓸𝓶𝓲𝓼𝓮!"
"𝓟𝓲𝓷𝓴𝔂 𝓟𝓻𝓸𝓶𝓲𝓼𝓮."
Yet as one received a powerful quirk and was praised for it, the other was shunned for being quirkless. One slowly became more and more prideful, and the other slipped further away. One forgot his promise, and the other was bullied until one final nudge was all it took.
The string snapped.
As one vanished without a trace, the other regretted. He shouted, he yelled, he threatened, he cried, he screamed, he pleaded, he begged, but nothing would bring her back to him.
The perfect circle had cracked in half. The siblings went down different paths.
One was determined to be a Hero, for the other, for their dream. The other pursued the path of a Demon Slayer, working to protect in the dead of night.
When they finally meet again, both recognized each other. He wanted to apologize, but she was no longer the same.
The siblings had became strangers. Mere acquaintances.
Disclaimer:
~ Characters belong to their respective owners except for my OC
~Blood and gore
~Mature themes
~ Manga spoilers
~Grammar(feel free to tell me)
~Trauma
So basically, you.
Muzan's 14-year-old half-demon daughter (I know it's cliche but bear with me) who he doesn't know even exists, somehow ended up under the suspicion of being a demon, which you were, halfway.
And it was decided that you would now be living with the famous insect hashira. Shinobu Kocho.
In the Butterfly mansion until they found out whether you were a demon or not after the test they had prepared had failed.
And though they would never admit it, they were basically holding you hostage and waiting by to kill you off.
You refused quite a bit but you apparently had no say in it.
Well, you might've not liked the fact that they were currently holding you hostage to figure out whether you were actually a demon or not before killing you after figuring out that you were a demon like Sanemi so wished to do so.
There wasn't, much you could do in this situation.
The most efficient solution you could think of to get them to leave you alone for the rest of eternity without spilling any blood was to lay low until their suspicion of you being a demon eventually died down and they allowed you to leave yourself.
However...
It seemed there were quite a number of Demon slayers who greatly disapproved of your stay here, or at least they were very wary of you.
the most annoying one being Sanemi Shinazugawa.
The reason was obvious enough. You were a demon.
Which now made the biggest hassle you had to deal with, staying alive until that point.
You have met quite a few demon slayers during your stay at the butterfly mansion, and though not many had been very pleasant.
There were others you encounters with a few individuals who were... Strange, yet enchanting. The most interesting one yet, a minty-haired airhead.
Trigger warnings:
X Swearing
X Gore
X Violence
X Grammer Mistakes
X Death