Joker's Girl

I'm writing based off Jared Leto Joker basically Katherine is a normal girl who use to work for Arkham there she met Joker who had liking for her immediately he admired and wanted her, she went to work one day and found Joker had escaped on her way home she got kidnapped, her life was about to a twisted turn what did Joker want with her and why was he doing this to her? Will she grow feelings for him or become his new punching bag.