A black heart for the blue leader (Leo x reader)

(Y/n) is a young girl who moves to New York with her abusive father ;after her mother dies in the car crash that started with her mom and dad arguing. She is forced into a job, no school, and is beat by her dad and his friends. But what happens when her heart turns black, will a mysterious blue masked turtle save her? Will she live a life without anymore pain and suffering? Find out and see!!!!