Disclaimer: I do not own Doctor Who or Harry Potter. Enjoy!

Ever since Petunia Evans' sister Lily had gone off to Hogwarts, she'd wished for something interesting to happen to her. Nothing ever seemed to. She was the boring, normal sister who never did anything strange of unexpected. Just a Muggle, that's all she'd ever been. She decided that if Lily was the one who had magic, she could have science. If her younger sister had words, then Petunia had numbers. At night, Petunia would stare at the stars for hours. People believed that she would become a scientist one day. Her parents were not impressed. All she wanted was for something extraordinary and amazing to happen.

This was how her entire adolescence went. She was the unremarkable, plain Evans sister, but she did not know that soon she would become so much more. When Petunia was 19, she met a man who was more wonderful and impossible than she could ever have hoped for.

Petunia had not quite achieved what she wanted yet. She was working in a shop while she tried to get enough money to go to a good university, where she could actually become a scientist. She was all alone, as her parents had both died a few months ago. She lived in the house she'd always lived in. She hadn't seen her sister in quite some time. It wasn't a very happy existence.

One night, however, was different. She was on her way home from work and decided to go to a small teashop for a coffee. It would break the tedium a bit, and that would be nice. On the walk there, she saw something a bit odd. It was a police telephone box. She had seen them before, when she was very small, of course, but they'd all been taken down a few years ago. Also, she walked this way nearly every day, and it had not been there yesterday. She shook her head and kept walking. When she got to the diner she wanted to go to, she saw that there were literally no lights on in there at all.

'Figures,' she muttered to herself.

There seemed to be no people anywhere near the building, so it surprised her a lot when a man came running out from behind it at top speed. He was a very odd looking man, indeed. He wore a blue shirt with a red bowtie and matching braces under a tweed jacket with skinny trousers and lace up boots. When he ran past her, he grabbed her hand and pulled her after him.

'Who are you?!' Petunia yelled as they ran.

'The Doctor,' he answered. 'Who are you?'

'Petunia Evans, and what in God's name in going on? Also, Doctor who?' she said as they slowed down.

'Just the Doctor,' he said with a smile. He had led her to the police box she'd seen on her way there and was sticking a small silver key in the door. 'As for what's going on, I wouldn't recommend going into that teashop unless you want to be dined on. And I don't think you want that. Well, you could, I guess, but you probably don't.'

He had the door open now.

'What do you mean, be dined on?' she asked.

'That diner was infested with Vashta Nerada. Biggest infestation I've ever seen on Earth. I've put a perception filter over there so no one goes there. Should be safe,' he said. 'Vashta Nerada are shadows that eat people. Bit like piranhas,' he added, catching her blank look.

'But what's a perception filter?'

'Oh. It's just a thing to keep people from noticing stuff. It's sort of like when you fancy someone and they don't even know you exist. Actually, it's nothing like that, but if it helps… Come on.'

He pulled her into the police box and her jaw dropped about ninety feet. It was huge in there.

'No way,' Petunia said, looking out the door at the rather tiny box that was the outside, and then back at the vast room inside. 'It can't be. That's impossible. It's bigger on the inside!'

She didn't notice the Doctor mouthing the words along with her with a giant grin on his face.

'It's called the TARDIS. Stands for Time And Relative Dimension In Space. She's my spaceship,' he said proudly, straightening his bowtie.

'Spaceship? You mean you're an alien?' Petunia asked, dumbfounded.

'Yes, I am.'

'You don't look like an alien,' she said.

'How do you know? Have you met them before?'

'No.'

'Would you like to meet more?' asked the Doctor with a twinkle in his eye.

'There are more aliens out there?' Petunia whispered in awe.

'Of course there's more, Petunia. Billions more. So I'll ask you again: do you want to meet more? Cause if you come with me, you will.'

'Come with you?' she said.

'Yes, in the TARDIS.'

'But I've got work.'

'Did I mention this is a time machine? We could leave now and have you back five minutes ago.'

Petunia thought for a moment. Wasn't this exactly the sort of thing she had wanted? This was the sort of extraordinary thing she dreamed of happening. She'd be mad to say no. She'd be even madder to say yes. So, of course, her reaction was:

'Yes. I'll come with you.'

The Doctor smirked a bit.

'I knew you'd say that. As soon as I saw you I knew you'd come.'

She smiled. He was right, of course. The answer would always have been yes.

'So what's with the bowtie?' asked Petunia good naturedly.

'Bowties are cool,' the Doctor replied.

'Sure they are.'

The Doctor chose to ignore her.

'So, Petunia Evans, where to? We've got all of time and space. Any event in history. Any planet in any galaxy, ever. First stop, here; next stop, everywhere! Just, don't say Cardiff.'

'I don't know. The future?'

'The future?' he repeated. 'Sure. This is 1978, right? Yeah, I know just the place.'

'Well,' said the Doctor. 'Hold on tight, then! GERONIMO!'

With a wheezing groaning sound, the glass thing at the middle of the control console thingy began to pulse up and down. They were thrown back and forth, and Petunia Evans was happy for the first time in a terribly long while.

A/N: I hope you liked this. I thought that Petunia deserved a better story than she got. She was essentially a good person, and I think she'd be a good companion as well. This is, of couse AU. I will get chapter two up soon. I just have to write it first. Bye bye Ponds! And real people, too. :)