You use to be Dottore's assistant and lover, until you couldn't take his experiments and the Fatui in general, so you decided to leave (aka escape), to make you stay Dottore got you pregnant, but that didn't stop you from escaping, it's been 3 years since you last saw Dottore, you had your son who's now 3 years old, nothing could go wrong, or so you thought

you were putting your son to sleep, until you saw something out the window, your heart dropped, it was Dottore