The Twins ~ Doctor Who FF

They live normal lives...but their definition of normal is rather complicated. Two identical twin sisters are haunted by vivid dreams from a young age,but one of them has it bad. Very bad.
On the day of their sixteenth birthday,everything suddenly takes a twist. They find out they are adopted,Annabelle is pregnant and the two girls get pulled to a different universe.
But apart for that their lives are quite normal.