They both have jobs, of course.

She crashes parties in 2180 and digs up the remains in 5168. An archeologist.

He charges around, saving planets and rescuing puppies and causing wars. A cosmic child.

He married her as reality crumbled and the sky burned. And when that was all sorted out, he took her for dinner.

That was life between the two of them.

They would meet, run into each other – sometimes very literally – and then they would do diaries. Which was painful for her and curious for him, until the time lines progressed far enough for the two that the emotions were swapped between the two lovers.

They were very good at not saying things.

You die at the Library - he doesn't tell her.

I am your murderer - she doesn't say back.

"I'm sorry," he tells her, though she doesn't understand why.

"I love you," she says, before he feels the same.

She has a day job, and a night one, too. But her real job is him. Keep him safe. Follow him into danger and shoot when he'd rather argue. Drag him away to save his life. Convince him to run. Her job is not easy, especially when a lot of people are always trying to kill him. But she likes it. It involves him, after all. She has always had a funny feeling that she will die for him. It comes in the job description.

He doesn't have a job, mainly because he hates them. Hates the domesticity of them, the shackles of monotony. He appreciates space and freedom and his little blue box, but not jobs. That's why she is his unofficial occupation. He invites her along when she doesn't invite herself. He makes sure every event in her diary goes as planned and that she doesn't die along the way trying to be heroic.

After all, she must live until the Library, at which time she will die to save him.

She is a curse. He must keep her alive to die at the right moment. He cannot give up or fail to care because time can be rewritten. And because he loves her.

Which sometimes is the worst part of all.

The Doctor and River Song – the archeologist and the Timelord – who together are both infinite and impossible, who still found a way when Time willed differently. Their time together was bowties and blasters, fezzes and eye patches, fixed points and little blue books.

And it ended with a library and a name.