I Became a S*ave to The Mastermind

I posted a prediction of the next story in the novel and was told not to spoil it. In order to not interfere with the main character’s progress, I lived well in the area that only appeared in the novel’s setting. One day the Mastermind came and told me to become her s*ave. “Our Hera… You need to be a good girl, right…?” Please save me.