The Villainess Tames the Beast summary:
I've posessed the body of the sociopathic villainess, Illyana! An evil villainess who picks up a boy named Magnus and raises him however she pleases... that Illyana is me?!
"I am going to tame you into a beast that cannot do anything without me. Just as you had done to me."
And after 2 years, he who had become an emperor began his revenge. Excuse me, author! Illyana was the sinner but why must I suffer his vengeance? I was just a normal reader named Yuna!