Disclaimer: Nothing of Supernatural belongs to me. If it did, Dean would be kept pretty busy!
A/N: A "what if" speculation, not yet AU as the series is still ongoing. Please let me know what you think.
Catalyst
"A year. It's been a year."---Meg, "Devil's Trap."
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The beams from a passing car glinted momentarily off of blond hair but failed to illuminate the face of the woman seated in the front passenger seat. The driver, a middle-aged man, lay back against the seat, head extended backward partially over the top of the headrest . Passing motorists, sparing a quick glance. Would have assumed him drunk or asleep.
Closer inspection, however, would have revealed the blood that coated his throat and still dripped sluggishly down his chest, though he had long since joined his ancestors. A portion of the blood that had initially gushed forth from his severed carotid now resided in the pewter chalice held by his former passenger. The flagon's sides were incised with arcane symbols and the head of a snarling dragon.
She had been stirring the blood with one finger as she murmured an incantation, removing the digit when the blood took on a life of its own and to swirl without any visible assistance. She slowly licked the blood off her finger and waited, as small multiple lights formed in the moving blood and elongated to spikes.
"Why?"
Why what, daughter?
"Why let him go?"
It is not yet time. There are other things that must come to pass and powers to be awakened. Do not fear, he will return with his brother. You wish to destroy him this much? He is but one of the enemy; this will be but my first move to take them all.
"I could have taken both of them."
To what end, daughter? That has not been your purpose. Not yet. I know this part you have played and this host have not been pleasing for you, but it has been necessary. There were always streaks of darkness in him, but not enough. Before I am done, it will be absolute. Your will be important in spurring the darkness in him. Do you understand?
"Yes."
Your time there will be ending as soon as he returns. It shall be used as a catalyst to send him further to the edge. Like his father. My enemy, yet he stands with one foot in the Shadow. Only the brother is a wild card. He remains untainted by his father's obsession and drive for revenge. He may, indeed, have to be removed from the board. We shall see. When you see them next, it will be time for the next step. Be ready.
"Yes. Yes, Father."
The lights faded and the blood in the cup stilled. She spilled it out onto the floor of the vehicle; it was no longer needed. She stepped out of the van without a backward glance at the driver. The demon within despised both this weak host and the son of her father's enemy. Hell, she didn't have to know his brother to despise him as well; he was a Winchester and that was enough.
Sam Winchester had promised to be back by tomorrow evening. Her time here was coming to an end and she would move on without this paltry host, whose destruction would accomplish her father's goal of pushing Sam Winchester further along the path to his fall.
Jessica Moore—or rather, the demon in control—smiled with satisfaction.
She hoped that this time Father had picked out a more worthy vessel for her to possess.
And she knew that, when she met the Winchesters again in her new form, they would not walk away unscathed.
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A/N: Yes, I know: the "flagon with the dragon". Sorry!