When you were brought into my little part of the lair you were the strong willed hero. Maybe the pinnacle of justice for the city. One of the chosen of the gods to stop the overlord. I knew I had a hars job cracking you. My instructions were simple. You were a threat and I had to make you loyal to my liege. I had to break you, I had to make you spill everything you know and swear your eternal loyalty to the evil Master I served.

And for a long while I struggled. You were intelligent with a strong will. You had a mind that was like a fortress. I tried a bunch of different things and none of them worked. Until I hit upon that one weakness. A combination of magic, drugs and sex. Using that I was able to turn your mind against you. Your willpower and morals starting to dribble out. Arousal thrumming in your body as it became harder to fight. I had kept you bound as I worked. But whilst I worked, I discovered myself developing feelings I didn't want to give you up. But what could I do?

That was when I heard you make an offer. A desperate one born of the situation. Before you lost yourself, a desperate impulsive play.

If I promised to serve justice, if I promised to defect, you'd become my sex slave. An offer promised with the power of magic. With the weight of desperation but the gods watching, to make sure if it was taken neither of us could break the contract.

I cupped your cheek. My eyes wide at the idea of the change. As your willpower dribbled out your cunt, I nodded. "I accept, my slave."