Earth
The Master never did understand the Doctor's fascination with the insignificant planet that most - if not all - of her companions came from.
He watched her sometimes, inconspicuously of course, when she was watching the humans. She got that small smile and would roll her eyes in an almost fond manner when one of them would do something primitive which caused the Master to scoff.
He had asked her once why she loved the unstable rock and the people on it so much, in his usual uncaring voice and wasn't expecting the defensive comeback from her.
"How can I not? They are compassionate, understanding and they have so much potential! You watch them change over the years and they just keep getting better and better and they never stop!" She snaps. She opens her mouth as if to carry on but turns around and carries on with whatever she was trying to do to the TARDIS. The Master watches her back but doesn't reply.
He knows why she loves Earth and the humans on it so much: she wishes she was one of them.
Me Again! Sorry for not updating in a while but I've had school (terrible excuse but it's true!). However, I have uploaded the first chapter of the full story, I'd love some feedback. It was horrible writing Utopia, I can't wait until we have the Master!