Brutus (Demon! Reader x Reverse Harem) {JJK}

Please know my actions are not motivated by envy
I too have a 𝘿𝙀𝙎𝙏𝙄𝙉𝙔
This death will be 𝘼𝙍𝙏
The people will speak of this day from near and afar
This event will be history
And I'll be great too
I don't want what you have
I wanna be 𝙔𝙊𝙐

---
You've been alive for so many years, ever since the Heian Era. You were a human daughter, an older sister, and a wife. Then you were a demon of a dead and cursed family, an older sister of the Demon King, and the ex-wife of an adulterous King of Curses. When at your lowest, your brother offered you a position in his hierarchy as the Duchess of Demons; not as powerful as him but demands the same amount of respect and more power than the other demons in existence. But after some time, you thought to yourself... "What am I doing? I'm doing all of this... because I was angry at being cheated on? By someone I thought would love me? This... this isn't right." After that epiphany, you turned over a new leaf and teamed up with the Demon Slayers only a few months before the final battle.
A century later, it's now 2018/the Reiwa Era, the friends you made back then have already passed away, you are the only thing of what remains of the Demon Slayer history. You have made peace with yourself and have moved on, made new friends to call family, new foods, new styles of life, and so much more. You even moved on from your old feelings of that pathetic excuse of a husband and glad you have nothing left of him. That is, until something happens.