First story! Instead of doing a disclaimer every chapter, I'll just do the one at the beginning. I do not, and most likely never will, own Doctor Who. Constructive criticism welcome. Enjoy!
The TARDIS could feel her Thief's pain. He was alone. So alone. And he wanted nothing more than to be alone. He hated to be alone, but now, he only wished that everything would leave him alone. That's what he told himself. That's what he told everyone, now.
She missed it when he would dash around her console and shout things, and grin madly just before he opened the doors. She missed the strays he would bring home, and their awe at her. Bigger on the inside, indeed.
She was floating around in deep space when she felt it. A few years away, but not far, there was something she had only seen in people that her Thief knew, or knows. The golden light, that warned of the changes. She opened the Time Vortex and hurtled through it. She found the source of the energy, and the beautiful light. She couldn't see it, but she sensed it. She materialized around the source, and felt the light subside and the person—was it person?—land in one of her bedrooms. She had been aiming for the console room, but no matter. This would make her Thief happy, she hoped. Bring back the life, the energy he had so long ago.
Everyone was gone. The pink and yellow human, who became something more. The other human… who had cared for her Thief, even when he didn't know. The fiery one, who became the DoctorDonna. The pretty one, and the orange one. The child of the TARDIS, who was never there for long, but she was almost always there. They were all gone now. They kept her Thief safe from himself. Now he had no one to keep him safe. But he would. A flesh and blood person, who wasn't forced to stay in one shape. The TARDIS would always find a way to protect her Thief. Her precious Doctor.