Prologue (updated)

After all that the Doctor has discovered in her thirteenth incarnation, it doesn't take long for her past to catch up to her. When it does, in the form of a companion she doesn't remember, who claims to have been at her side throughout the years she spent working for the Division, the Doctor doesn't know what to do, or how to respond. A thousand questions envelop her - How much of her past could she regain? How much does she want to know? And can she undo the damage of a relationship torn apart by Tecteun, and half-forgotten?