Nothing

I was driving her home from work when she asked me. She was dozing off, her head resting on the arm rest between us. The thoughts rolled through my head, just like the lights from the street lamps rolled over her resting body, quickly -- illuminating her for a moment. Even though she was fading in and out, she still asked me what was on my mind.

Nothing.

She didn't believe me, so I told her work. I told her it was my money problems, which it was -- but that was a few layers down. That was something I didn't want to think about, because it made me depressed.
I told her it was the people at our work, who were on my mind. It was, but it was only her.
I told her my hobby was on my mind, which it always is, but the catalyst is always on the top of the list.

Nothing.

She's always on my mind, the one person I hope remains a constant. The one person I'd keep at arm's length if it meant jeopardizing the equilibrium we've developed. It was hard, at first, to overstep my boundaries -- but then I realized, the feeling was mutual. Therefore I was freed from the shackles of wanting to impress. I had forgotten that I didn't need to try in the beginning, why should I now?
She was always on my mind, like the faint glow of a light bulb after its been turned off. I wanted to tell her she was on my mind, my most valued friend, the catalyst for so many great achievements I made within myself, but all I could say to her was,

"Nothing."

And so I continued to drive her home.

-Sir Jestro