Season 3. Episode 3.
Bad Day At A Black Rock.
"Sierra, you were there! I thought you'd back me up on this!" Sam exclaimed, turning his body slightly in the Impala to look at her in the backseat.
Sierra scoffed, unfolding her arms and leaning forward, "I don't trust her one bit, Sam. I might be a hypocrite, but she's a full-blooded Demon, Sam! She knows too much about us both already."
Dean was driving down the quiet, dark road with his hand angrily gripping the steering wheel, "The second either of you find out this Ruby chick was a Demon you go for the holy water! You don't chat."
"I did! Sierra said there was no point." Sam shot back, gesturing to her in the back again. Dean shot her a glance.
"Why the hell would you say that?" Dean questioned with his brows furiously furrowed.
"Because I wanted to know what her agenda was. As soon as she came up to us in that restaurant I knew something was off." Sierra explained in the same annoyed tone, "Demons don't just fancy a chat every now and again. They want something. I would know."
"No one was chatting, Sierra." Sam shook his head.
Dean frowned at his brother, "Oh yeah? Then why didn't you send her ass back to Hell?"
"Because-" Sam began, looking at Sierra for help, but she wasn't in the mood to give any to him right now, "Because she said she might be able to help us out!"
"How?" Dean asked with fake sarcasm, not believing it. Sam paused, looking away. "No really, Sam, how? How could she possibly help us?"
"She told me she could help you, ok!?" Sam snapped, Dean didn't reply since he didn't get what he meant. "Help you out of the Crossroads Deal."
"That's exactly why I don't trust her!" Sierra raised her voice, then chuckling exasperatedly. "I used to work with them fuckers, I know more than her, but you won't listen to me!"
Dean looked at Sam incredulously, "What is wrong with you, huh? She's lying, you gotta know that, don't you? Sierra's said time and time again that there's no way. Ruby knows what your weakness is - it's me." Sam was still silent, pausing. "What else did she say?"
Sam still didn't say anything, then he muttered, "Nothing." Dean gave him an unconvinced look, causing his brother to roll his head back in frustration, "Nothing, ok?! Look I'm not an idiot Dean, I'm not talking about trusting her, I'm talking about using her."
"Why do I feel deja vu?" Sierra snickered, tilting her head at the younger brother accusingly.
Sam sighed, looking back at her, "Sierra, you were different. At least I actually had visions to show me you could be trusted, and now here we are." Sierra looked at him dumbfoundedly, before her face twisted again and she began to rant.
"Yeah, exactly, here we are! You're talking about using a Demon, who somehow knows a crap ton about your family and about my new abilities before I even knew it would happen! Oh, now she wants to help Dean somehow, which is impossible, and also help me with my abilities? Es mierda!"
"She said she can help you with that fire stuff?" Dean quipped, looking at Sierra through the rearview mirror. Sierra just nodded with a sharp hum. "Does she even know how to do that?!"

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HELLHOUND - Supernatural
RandomIN WHICH, an infamous 'demonic pitbull' shifter changes her ways for the better and continues to grip onto the final strings of her humanity, unlike other demons that want her dead. And somehow, ends up in the arms of a certain hunter, who overtime...