"Cas, do you mind buying me some pie? It's been a while since I ate decent apple pie." Dean said, leaning back on his chair to look at Cas behind him. He was looking through books in the Doctor's bookcase.
They were in one of the Doctor's rooms. It had a comfy rug in the middle and gold walls. In the right wall was a painting of a man with curly hair and in a coat that looked like a bunch of different materials of cloth sewed together. He was with a girl who hugged him and leaned back with one leg raised. She had the same extremely curly hair and she was in a polka dot dress. Chairs faced the front wall which was a gigantic mirror with the view of the universe floating by. The left wall was a full bookcase and behind the chairs was a fireplace spouting green fire that doesn't go out and doesn't cause much mess and smoke.
"Would you be able to find America from here?" Dean asked Cas who started counting money in his trench coat. "Of course" and with the swish of his wings, he was gone.
He appeared behind a convenience store and was about to enter when he felt a hand grab his trench coat from behind. He immediately took out his knife and twisted to face his attacker and stabbed. The attacker wore a robe that covered his whole body and a hood that hid his face. The knife went straight through in him but he didn't even wince. Cas pulled the knife out and there wasn't a single drop of blood.
Cas looked at his attacker horridly. He could feel the face under the hood smile and a deep voice said "Don't worry fallen one. I won't kill you unless you keep your nose out of the mission. They sent me and now I'm going to send your friends a little message."
After a few minutes of roaming the tardis halls, he finally found the doctor who was in the control room, examining the purple popsicle.
"Hello, Doctor." Sherlock greeted blandly as he walked beside him.
"Hello Sherlock, Charlotte, I don't know which you prefer."
Sherlock stood there for a few minutes before saying "Don't you ever leave this room?"
"She doesn't like being alone, you know."
"She?"
"the tardis!"
"oh"
"Yeah, sometimes it's just me and her." The Doctor smiled up at the tardis fondly before continuing his work. There was another silence until the Doctor said.
"Amazing, look at these chemical compounds. I've been examining the think you have in taken." The Doctor whispered mostly to himself "They have the power to completely bend a person's will once you drink but it has an extra element- iodine- which transfers the effects so that it won't change your will, it will change your gender."
"Salt changed me into a girl?" Sherlock asked.
"Afraid so. So this is a major clue though. Something big is coming and it wants to make followers. Controlling a person is by force. Changing their will makes them think they're doing what's right."
Just then, Dean burst into the room, panic stricken and sweaty probably from running in the tardis.
"Castiel." He puffed "Something is wrong with Cas."