The world is ending for humans the only ones that are surviving are the supernatural like vampires werewolves witches etc... But we live in a place no human can get near except for one.
"It's going to be difficult to get away from your uncle's kingdom. I could make it easier for you, I could make you travel faster and further. They couldn't track you down. I have resources, means at my disposal, money and connections. Magic... Nobody could hurt you by my side. Your life will be an adventure"
"As far as I know, sorceresses aren't altruist. What would you want in return?"
"You. I want you in my life and in my bed, willingly and ready to please me. Be nice to me and I'll treat you like a queen"