We're not helping (Kny x Fem!Demon!reader x Aot)

"We've been kept in the shadows for long enough!"

(Y/n) Kibutsuji and Unika Kibutsuji, the oldest son and daughter of Muzan Kibutsuji. After the ancient war between humans and demons they made peace between the two sides. The Hashiras and others were turned into half demons to live on for others. What would they do once the titans start rise with the demons that got of control?

Your taking the spot of my oc.