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'Cause I can't help thinking,
And I don't look down.
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His mind was going again. All the times he 'would have' and 'could have'. More importantly, the times when he 'would never have', simply because everything had been wrong. Most things were wrong, he realised. The things he could draw up on a list would make it far too long. He was an alien, to her. She was an alien, to him. He was a Time Lord. She was a Human. All right, so probably one of the closest thing to a Time Lords was a human, but it was just the tip of the iceberg. She had family, friends, a life. He was just himself, alone, a wanderer. There was a world, a galaxy, of differences between them. But suddenly, right now, it didn't matter. Right now, it didn't matter that he had seen more in the entire universe than she had ever imagined. It didn't matter that they were worlds apart, that they should never have found each other, that they were 'incompatible' in more ways than just one. Because she was here, with him, and wouldn't choose anywhere else in the universe. And neither would he. What did that make it, then? Was this the universe telling him, 'Oh, by the way, I'm about to send you someone who actually makes your life worth living but you'll never be able to do anything about it because I'm just that cruel'? Certainly seemed like it. But why him? And why now? This sort of thing didn't happen to him: had never happened to him. It was all a tangle of misunderstood mistakes, he was sure, and one day she would wake up and realise it.
"Doctor? You alright?"
Her worried, soft voice broke through his thoughts and shattered them into a million pieces.
"Yeah," he assured, looking up and grinning to her, his troubles falling away. "Never better."