Winter's fire

Starts shortly before the first season. Raenera Targaryen is the daughter of the mad king and Lilliyan who was lesser northern family. Taken in by Jon Arryn during the sack of King landing. She is raised by him by the name of Lady Raena Stone to keep her safe. What will happen when he dies? What happen when she makes a promise to the new Hand to keep his daughter safe? Robb S/OC