"Souffle girl..."
The Doctor wandered aimlessly in circles around the TARDIS controls, occasionally pushing buttons or pulling rigs. The flashing screens saying
"Landing!"
"Flying!"
"Warning!"
"Overload!"
"Planet Collision!"
Were not occupying the vacancy of his clever mind. The only thing that was, was:
Clara.
Oswin.
Oswald.
He had never met a woman with the same intelligence level as himself. She was cunning, beautiful, smart. It puzzled him.
"She could be... River!" He spoke to himself, aloud. It seemed his conscience was his only company these days. After Amy and Rory left. But he refused to remind himself of the tragic event, and instead just focused on Clara.
"She could be a Doctordonna. Or even just a plain Donna"
It took the Doctor quite a while to realize he had symptoms of a syndrome. A syndrome that affects many, many people in the world. Quite close to the entire population.
His stomach felt queasy, but not sick queasy. His tongue swelled up. He felt lightheaded. He felt anxious around her.
And even though he pretended to not like it when she kissed him, he loved it.
It lit up his world, like fireflies in a night sky.
His thoughts were interrupted with a shake of the TARDIS.
"Yes, honey I know." He told her.
"I know what's wrong with me"
He looked down at the ground and decided to face his permanent fate. He didn't get another turn to debate.
"I'm... in love."