The Girl Who Could Never Leave (Doctor Who fanfic.)

Ariella is a time lord/lady. She has known the Doctor since they were little on Gallifrey, now they are the only ones left. after 600 years of nothing in her life, Ariella finds her self stuck with the Doctor on the planet Midnight, she has no choice but to tell him who she is. now follow her life and discoveries of who she truly is with the ninth tenth and eleventh Doctors as The Girl Who Could Never Leave.