Villain Origin Story

A poor village girl enters her villain era with the help of the resident evil tyrant...
Everyone has their limit. Joslen just hit hers.
Life has never been easy for a poor, uneducated village girl, especially one with a crooked back that has some villagers muttering she's been cursed at birth. But when things in Joslen's life go from bad to progressively worse, it fills her with intense frustration. How does she fight back against an arranged marriage and a lifetime of misery if no one will even listen to her? What's a nice girl supposed to do?
A brush with the handsome but dangerous Scourge King, the conqueror of her land, teaches her something important. It's time to stop being nice and start being ruthless. And the perfect person to show her how to be bad? The Grim Lord himself, Vilos Saumien.
But the maniacal half-demon overlord has a few stipulations. If Joslen wants to be his apprentice, she needs to play by his rules. She must agree to obey his unhinged commands, keep him entertained...oh, and let him seduce her. It's clear Vilos loves the thrill of the chase, and giving in will mean her downfall. Now Joslen has to figure out how to navigate the poisonous court, learn enough magic to thwart her enemies, and keep Vilos wanting more.
Let the games begin!