Chapter One: I'm the Doctor.

John has a pocket watch, one that Harry gave him after their father died, saying it was a family heirloom. However, when a certain someone goes to visit him, he remembers things he feels he shouldn't, things he really didn't need to know. Does he continue with his mundane life? Or does he seek out his origins with his guide?
WhoLock crossover with John/Mary, Sherlock/Molly, and more along the way!