A/N: I only have two more written after this one. Since I've started a new job and am getting things in order for graduation in three weeks, it may be awhile before I get anything else out. Thank you MerriWyllow for your reviews; I appreciate the time you take to read this lil' compilation of mine. I hope you enjoy this one! (I honestly have no idea where it came from XD)

Takes place after season 4 of The Mentalist, season 6 of Doctor Who, and season 7 of Supernatural but has no spoilers.

What Should and Never Be Done

The TARDIS hummed. Her Doctor sat awfully tense in his seat. His legs crossed over each other at the knees. His arms folded across his chest. His face buried into an open palm. He seemed to just be on the precipice of caving in on himself. The cause for his distress stood just a few feet from him, a hand tentatively resting on the console for support.

No. Not support. Her weight was evenly distributed on her feet as she stood firmly. The hand on the console was an anchor. As hazel eyes glanced briefly at the tubal engine, the TARDIS realized it was a plea directed at her as well.

The TARDIS hummed again.

"We can't go back." The Doctor snapped as if addressing the TARDIS more than his temporary companion.

"I'm not going to change anything."

"Just you being there changes things."

"It's not any different when you go traveling with everyone else."

"No, no, no, no, no!" He swung up from his seat, pacing for the other side of the console. "Never in their own timeline; I never take people into their own timelines. Things get complicated and you lot always manage to mess things up!"

Undeterred, the companion turned her body to continue facing his; all ten fingers now splayed across the console's surface.

"They knew me way before I'd ever met them. I used to think it was because I saved Dean, but it's not. You know it's not."

"I don't know anything of the sort. And neither do you!"

She looked at him across the engine. He was all concentration, his eyes boring holes into the heart of his TARDIS. He appeared so young and so old all that once. She almost felt sorry for putting him in such a predicament, but she knew where her heart lay, what her morality was screaming at her. She had to do this. And she needed him at her side.

"Rule number one," Her voice nearly trembled with emotion. His eyes flicked up to meet hers. "The Doctor always lies."

He held her gaze and didn't speak for a long moment.

"Ah, Grace. This is a very bad idea."