Summary: Harry had a twin sister, Willa Potter, who was abandoned by the Dursleys in front of a certain blue police box because they thought two Potter children would be too much hassle. Willa was raised by the Doctor with help from Rose, Martha, Donna, Jack, Mickey, and Amy (not all at once though).

Characters/pairings: 11th Doctor, Amy, Harry, Hermione, Ron, etc… mentions of Doctor/Rose, obvious Doctor/Amy, eventual Harry/Hermione and Willa/Ron

Disclaimer: I don't own anything other than books, a TV, an over-active imagination and a dog.

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Lying just outside the TARDIS door was a tiny little one-year old baby girl with dark red hair and big brown eyes. She was bawling her eyes out.

It wasn't until the Doctor opened the door of his time machine that he realised she was there.

"Oh!" he said, surprised by the frightened child sitting in front of him. "How did you get here then?" She calmed down a bit after being picked up. It was then that the Doctor noticed the letter taped to the pink blanket wrapped around her.

He took the baby indoors, changed her, fed her and burped her before getting her to sleep, all without Amy realising (she was asleep). It was then that he opened the letter. It was printed out, so he wouldn't be able to trace it easily, and whoever had left her there clearly didn't want her.

To whomsoever it concerns,

If you are reading this you have obviously found our niece, Willa Potter. We really don't want her, since we already have two children to look after. We don't care what happens to her.

Yours sincerely,

Mr. and Mrs. Anonymous.

The doctor was shocked by this. How could anyone not want to look after such a sweet little baby? He knew he shouldn't, but the Doctor couldn't help but get attached to little Willa. The only thing was, how could he possibly juggle saving the world every other day and looking after a baby.

The Doctor looked up as Willa stirred a little in her sleep, perhaps having a bad dream.

And then a supremely bright idea struck him.

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Okay, I know it was short, but it was just supposed to be a prologue. There will be more soon, I promise. TTFN, Ta-Ta For Now, Nessie, xoxox