Title: The Companion

Author: Nemainofthewater

Warning: Spoilers for Supernatural season 4 and Doctor Who up to season AU.

Disclaimer: I don't own anything. It belongs to the BBC and the CW network.

Chapter 4

"Amelia, please call the Doctor and arrange for him to meet us her," said Castiel.

"You won't hurt him?" she asked the angel, obviously torn between her loyalty to the Doctor and her love for her husband."

"I will not harm him," the angel replied, soothing the Amelia's fears. She nodded once, took out her mobile phone and walked to a more secluded spot to call the Doctor. Donna started after her, but stopped at the sound of Castiel's voice.

"Donna Noble," he asked, "Why are you here?" Donna looked at the angel, and despite her misgivings, some voice inside of her compelling her to speak truthfully.

"I dunno really. The Doctor's friend I guess. He needs someone to look after him, and he seemed to do a good job of it."

"But why do you travel with him," Castiel pressed.

"I just want to see new planets, help people, save civilisations from the things that would freeze their blood."

"What would you do if I told you that you could help people here on Earth?"

"Me? I'm just a temp. Besides, what could I do? Join Greenpeace?"

"There are other battles to be fought."

"Yeah? Like what?"

"There is an ancient battle, of good versus evil; demons walk this earth, destroying the Lord's work and tempting..."

"Cut the recruitment spiel," Donna snapped "And tell me what you want. Why you're telling me this."

"You said you wanted to help the world. I have but one question for you. What lengths would you go to, to do this?"

Donna started to reply, but she was interrupted by Amelia's return.

Immediately, Castiel turned away from her, and trained his gaze on Amelia instead.

"Let me talk to him now," Amelia said "Please. I did what you wanted. Now let me talk to him."

Castiel inclined his head, and closed his eyes with a serine albeit blank expression.

Suddenly, that changed, and Castiel's, no, Jimmy's eyes snapped open, and he stared at Amelia.

Donna moved away from them, giving them space for an obviously private moment. A few meters away she stopped, sure that she had heard a voice in her head.

"Hello?" she asked rather cautiously, rather glad that no one was around to see her get into a mental conversation with a voice in her head.

"Donna. It is I, Castiel." The voice seemed to come from a spot in front of her, and before her eyes a silhouette of a man appeared. Only, it wasn't a man, for no man could have those wings that sprouted from his back.

"Castiel?"

"Yes."

"Answer this then. Why do you need to steal people's bodies if you have one of your own?"

"There are few people who can bear to see my true form, Donna. Or hear my true voice. And I do not steal people's bodies. I have the consent of all my Vessels."

"So what happens to people who can't see your true form?"

"Their eyes burn." He replied, matter of factly.

"What!"

"If a human gazes upon..."

"Yeah, I got that thanks. So why are you hanging around here talking to me?"

"I believe that you are able to become my Vessel."

Donna snorted. Loudly.

"And why would I want to do that?" she asked.

"Because it would allow my present Vessel and his wife to be together. It would also alow hil to accompany the Doctor again."

There was a silence. Finally, Donna replied:

"I'll think about it."

The Doctor's phone rang; it's ridiculously cheerful ringtone shattering the silence that he, Bobby and Dean were working in.

"Hello?... Amelia. You want me to meet you?... Where?...I'll be there. "

He put down the phone, and flashed a mad smile at the two other men.

"Gentlemen, I know where we need to go."

The wind blew dramatically, making their coats swirl in the wind. Thetwo spectators stood at the side of the road watching as the two men stared at each other.

Amelia was crying as she replayed whatever Jimmy had told her while Donna was deep in thought, as she mulled over Castiel had told her.

The Doctor broke the silence first.

"Get out of my friend. Find another Vessel, just get out of him."

"As I told you before, I am afraid that I cannot do that. It is difficult to find a Vessel as so few men have faith."

"I don't care. Just get out of him!"

Castiel looked at Donna then. "I cannot do that," he repeated, "unless I have another Vessel."

He walked over to Donna, much to the confusion of the other two, and stopped.

"I must have your answer now." He said to her quietly.

"Will you leave the Doctor and Amelia alone?" she asked.

"I give you my word," he replied.

"And I don't want to be asleep in some corner of my mind. I want to be awake, and help."

"Agreed."

"Donna, what are you talking about!" asked the Doctor frantically.

"Yes." Donna said firmly, ignoring him. "Oh, and Doctor," she continued, finally turning towards him, "it's been great."

"Close your eyes," Castiel instructed in a voice that would brook no disobedience.

A bright light flashed and a feeling of warmth flooded over them. When they opened their eyes once again, Jimmy had collapsed on the ground, unconscious.

And Donna was just standing there.

"Donna, why?" whispered the Doctor brokenly, half to himself. He received no answer.

Donna gave one nod to the Doctor and Amelia and then disappeared.

The End

A/N: I think that I'll post an epilogue, and I might write a sequel, but this is definately the end of this story. Thanks to everyone who reviewed or added my story to story Alert or Favorites.