Crowley let his fingers run over the button son the console as he watched the alien lounge around. After getting used to the anti-gravity button, he had decided to keep an eye on him. He did, after all, possess two hearts. And that could come in extremely handy, Crowley thought as he eyed the Doctor, black eyes blinking with a child like wonder.
"How do you think this works, eh?" the alien asked, a thick Scottish accent ringing in Crowley's ears.
"I know as much as you do about this," Crowley answered, letting his fingers circle the outline of the buttons and levers. His nails left deep gauges in the wood, sawdust floating to the ground at his feet. The spring ket chugging happily, unaware that its owner was no longer.
"Just think!" the possessed Doctor cried, "i tho thing travels, just think how much of history we could change!" Crowley raised an eyebrow in question.
"Are you saying this is a time travel machine?" Crowley inquired. The alien nodded, running a hand through the wondrous brown locks that decorated his scalp. Crowley pursed his lips. There was no such technology anywhere in Heaven or Hell. Time travel, eh? he thought, chuckling darkly, if i had a machine like this…
If he had technology like this, he could take over any part of the world he pleased.
Or possibly any person. Eyeing the demonic Doctor, he began whistling a little tune- "London Bridge", considering they were probably somewhere above England, judging by the machine's calculations.
"So, what now, sir?" the alien's Scottish accent sounded child-like, amazed with what the world had to offer. Little does he know, Crowley thought, his world is about to shut down. Crowley smirked.
"Now," Crowley said, pondering the question, "well, now you die." A look of confusion flashed in the sensitive brown eyes as Crowley reached into the inside pocket of his coat, his fat fingers prodding the fabric until he felt it: the smooth metal, cool against his skin. Withdrawing it, it glinted against the artificial lights in the TARDIS, menacing as it was surrounded with a yellow glow.
"B-b-but sir, w-we had a deal….!" the alien pleaded as Crowley rushed at him, blade poised above his head. Tip aiming for the heart, he drove it deep into the alien's flesh. The Doctor threw his head back, gasping, jaw hanging as if he were a puppet. He felt the warmth drip slowly down his chest, making a dark stain in the fabric of his clothes.
"That should do it," Crowley said to himself, yanking the blade ferociously from the body as it collapsed at his feet, a soft white light flickering from the open mouth and eye his eyes wander, Crowley stared for a minute at the other dead body- that blond chick's boyfriend, no doubt, he remembered, sighing heavily. Shaking his head, he was about to pick up the Doctor's body when he jumped back in surprise.
Instead of lying on the ground, it was now sitting up, panting heavily, a hand on its chest, clutching the shirt it wore.
"What are you?!" Crowley exclaimed, a mix of bewilderment and slight fear, "I just stabbed you to death a second ago!" Shaking his head, the possessed Doctor held a hand up in weak defense, begging, "Please… I-I don't know what it is, sir…. we've never possessed an a-alien before… remember….?" Rolling his eyes, Crowley bent down and grabbed its arm, nails digging into the skin.
"If I kill you you stay dead, dammit!" Crowley shouted, the demon nodding in fear.
"Yes sir! Very well, sir!" he agreed stupidly, sweat beading on its pallid face as Crowley raised the knife once more. Crimson splashed his face, decorating his black suit and the floor as he drove the blade home a second time. Pulling it out, he let the body slide to the floor, blood running like a river on the side of the console. As it fell with a muffled thud, Crowley pocketed the blade once more, ignoring the fresh coat of red.
"What's dead should stay dead," he muttered, ambling away from it, letting his nails click and clack against the metal of the gears as the TARDIS continued on its journey, completely unaware that it was witness to double homicide, bathed in the evidence.