The Man and His Box

When Mirabelle stepped into a mysterious blue box with a strange man she just met, she didn't know what to expect. She most definitely didn't expect the box to be a time-travelling spaceship, and the man to be a two-hearted alien. And after he asks if she wants to travel with him, she doesn't know what to say. She decides to go on one trip, and if she doesn't like it she can return to her ordinary life back home. But with each day the trip grows her feelings for the man do as well, and soon she isn't sure if she wants to go back.
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Note: The story takes place in the Doctor's timeline after 'The Snowmen' and before 'The Bells of Saint John'