What I Did on My Christmas Holidays by Sally Sparrow (short story)

Summary
Sally Sparrow is a child who is contacted by the Doctor after he gets stuck at her mum's party after the TARDIS burps. The Doctor then precedes to write messages under Sally's wallpaper in her room and he sends her a video containing messages to Sally form Sally's mum's party.

Characters

 * Ninth Doctor
 * Sally Sparrow

Continuity

 * Despite this story was later remade for television, it is still quite easy to place it as happening within the established "canon" without it taking place in an alternate universe. It likely takes place before the Ninth Doctor meets Rose Tyler, as he is without companion. However, in Rose, the Doctor appears not to have noticed his large ears before, placing Rose very soon after his regeneration. The best placement is just after Rose declines to travel in the TARDIS, and before the Doctor returns and mentions it travels in time and space.