"Nobody cares that you're broken, Cas!" Dean yelled. "So clean up your mess."
There was an inhuman screech and something tackled Dean from behind and slapped him in the face hard.
"How dare you say that to my poor baby!" A female voice screamed. "You didn't even thank him for healing Sam and you just dumped him at a hospital when you didn't need him. You are a horrible friend!"
"Woah, how do you even know about that?" Dean demanded, getting up.
"Maybe I'll tell you later, but right now, you need to apologize to Cas," with that, she strode over to Cas, who had stood up,and placed a hand on his forehead. Instantly, he was healed.
"How did you-" The girl cut him off by pulling him in for a hug.
"Shhhh, my poor poor baby," she said. "It's fine now, it's going to be okay." Sam looked at them with an amused look on his face. The female pulled away all of a sudden and smiled a bright smile at them.
"Oh my chuck!" She squealed. "I've always wanted to meet you guys!"
Dean blinked in surprise at the sudden change in her.
"Who are you?" He asked, pointing a gun at her.
"Oh I'm no one you should worry about. Unless you hurt Cas or baby though. Then I will find you and, quoting from Sam here, I will kill you dead. I'm Cynthia, by the way."
Dean examined her more closely. Cynthia had long black hair and teal eyes. Her face was perfectly sculpted to the point of perfection. This is from KOTLC. This is how Biana looks.

Cynthia looked about the same age as Jo.
"Now apologize to Cas!" She prompted.
"Uh, sorry?" Dean said.
"No, say it like you mean it. You've been nothing but horrible to him lately so you need to apologize! Say it like the time you did after you kicked him out of the bunker."
Dean looked at her questioningly but said his apologies.
"Look, Cas, I'm sorry. I shouldn't have said those things to you, alright? So, I'm sorry."
Cynthia grinned at him.
"So he probably needs his grace back, right? I mean, after everything that's happened, with Metatron and Naomi," Cynthia asked.
"Who?"
"What do you mean? Wait, what's happened so far? I mean, have you guys even been to Purgatory yet?"

"What?" Cas asked sharply.

"Oh Chuck. So you haven't met Benny yet? Naomi hasn't brainwashed Cas yet? Metatron hasn't tricked him yet? He still has his grace? The angels haven't even fallen yet? Oh Chuck, this is not good!"
"The angels will fall?" Sam asked. "Why do you keep on saying 'oh chuck'?"
Cynthia chuckled.
"Don't you know? Chuck is god. And btw, God is bi."
They all stared at her.
"What?" She asked.
"How do you know all this?" Sam asked.
"Well I'm a fangirl. Of course I know."