AUTHOR'S NOTE:

This story is dedicated to kmgproductionz and princessjames21. I don't know how often I will update it, but I will try to update at least once a week, mainly because each week passing means I get to know more about Erin and how Erin operates—how she thinks and reacts. Still, she made the most sense in the role I've assigned her because of her past we know nothing about yet, haha. Also yes, there is a Martinski endgame in this story, and a Sophia/Jensen pairing. Teen Wolf meets Supernatural meets Chicago PD.

WARNINGS: Language, Dark Themes, Crime, Blood, Sexual Situations
ENJOY!

xxxx

"Lydia, what if you're just overreacting?" Stiles Stilinski asked her slowly.

Lydia Martin shook her head and stared at the piece of paper in her hands, trying to comprehend what it was that she was looking at. All she had wanted was an 'A' on this project and now her entire life had changed in the blink of an eye. For some reason it made sense, but all this time she had just thought she was the daughter of any other two people who just happened to get divorced, but that wasn't the case at all it seemed.

"Overreacting?" Lydia asked him sharply. "Stiles, I'm adopted. I'm adopted and it took my parents this long just to tell me that. How could I possibly be overreacting?!"

Stiles looked at her. "Gee, I wonder why."

"Don't be snippy with me!" Lydia told him, opening up her laptop as he sat next to her on the end of her bed.

"I'm not the one who is being snippy right now!" The young man snapped at her.

Lydia looked at him. "You are being snippy now…"

Stiles made a face like he was losing patience, but Lydia smiling at him made the feeling pass after a moment. She knew that she was overreacting, but it still hadn't sunk in quite yet that she was actually adopted and that the birth certificate in her hand held the names of her birth parents. Even though this had started out as a school project about their family trees, Lydia was pulling up 'Google' and typing in the name of her father, just in case: Dean Winchester. Immediately a whole slew of articles popped up and her eyes widened.

"He's a criminal!" Lydia exclaimed, Stiles looking over her shoulder now. "May I overreact now?!"

Frowning Stiles took a deep breath. "It could be worse…"

"Worse than having a mass murderer as a father?!" Lydia asked him rather alarmed. "I don't think so!"

"You never know…maybe he didn't do it," Stiles said with a shrug. "People around here have been framed with less information…to…go…on…"

He'd been trying to reassure her, but Lydia pulled up a YouTube video that had been uploaded from some poor victim's phone of Dean and Sam Winchester massacring a whole diner. She sighed loudly and quickly exited the tab, looking at Stiles. He was at a loss of what to say and so he just looked right back at her, keeping the eye contact and saying the first thing that came to him.

"At least we know you got the handsome genes from him," Stiles told her.

Lydia furrowed her brows at him and then looked back at the Google search bar. "I'm going to type in my mother's name but I swear to God, if she's just as terrible a person…"

"Everything's going to be fine, Lydia," Stiles said as he reached out to rub her shoulders.

"Yeah, if you say so," Lydia replied sarcastically.

Still, Lydia looked at the birth certificate and saw the name that was written on the line of her biological mother: Erin Lindsay. When the search popped up, Lydia felt like her heart wasn't racing as much, seeing that her mother was actually a detective on the Chicago police force. It made her happy that at least one of her biological parents seemed respectable, but she seemed like such a polar opposite from her father. How did they even work together? Still, she wouldn't be Lydia Martin if she wasn't pro-active.

"She's hot," Stiles said with a smirk, Lydia reaching over to pinch him. "OW!"

"You're not being helpful," she replied with a shrug, as she looked up contact numbers.

"Lydia…what are you doing?" Stiles asked her slowly, recognizing that look in her eyes.

Lydia looked at him. "I have calls to make—I'm going to track her down."

xx

Dean Winchester thought that the name 'Beacon Hills' was ridiculous, but there were too many animal attacks around the full moon there and it was his and his younger brother, Sam's, job to look into it. They were hunters, saving people from the supernatural and while it seemed like they were sociopaths—and perhaps it could be argued that they were—they were just saving people and hunting things: the family business.

Well, except that Lydia didn't do any such thing.

Still, in Dean's defense, he didn't even know that he had a daughter and so when he got to Beacon Hills and he checked into the motel, he didn't think anything was out of the ordinary. Instead, when Dean got to the diner in town and Lydia dropped her cup of coffee on the floor, he just thought it was a normal, random happenstance. At the same time, when he saw her keep looking at him, his whole body stiffened and he wondered if these people knew: if they'd seen that footage of the imposter Winchester brothers shooting up places.

"You can't keep staring at him, Lydia," Stiles told her as he sat down next to her and handed her a fresh cup of coffee. "He's getting nervous."

Lydia looked at him. "I know that we tend to let murderers live—Peter Hale is a prime example of that—but I just…this can't be a coincidence!"

"You should talk to him," Stiles said, sighing when she glared at him. "Oh my God, Lydia, I will go with you. Stop acting like I'm pushing you into danger against your will."

"What am I supposed to say to him exactly?!" Lydia asked him.

"I don't know, but you better think fast," Stiles told her, Lydia looking in the direction that Stiles was motioning in. "He's leaving…"

Lydia sighed and while she wanted to run in the other direction, almost getting killed by strangulation by a Darach recently, had her feeling more brave. After all, she didn't really believe in coincidences. So, she got up and hurried after him, Dean showing up out of what felt like nowhere and then Lydia screamed, but Stiles was quick to cover her mouth as Dean covered her ears. Whatever that scream was, it didn't sound entirely human but it certainly wasn't a werewolf scream…what the Hell?

"Easy, Lydia," Stiles said, removing his hand as she looked like she was going to calm down. "What is your problem, dude?"

Dean looked between them. "What do you mean what is my problem? You two have had your eyes on me since I walked in. Creepy much?"

"Oh my God that's where you get it from," Stiles told Lydia, groaning when she elbowed him in the stomach.

"What?" Dean asked after a pause, trying to understand what Stiles had just said.

Lydia cleared her throat. "Turns out I'm your daughter."

"Whoa, whoa, whoa!" Dean told her shaking his head, caught off guard. "You can't be…"

"The name on the birth certificate says 'Dean Winchester' and I memorized your face off of the Google search," Lydia informed him, both her and Dean looking each other over awkwardly. "The Internet seems to think you're a killer."

Dean nodded slowly. "Yeah, well…and who pray tell is your mother, Kid?"

"Detective Erin Lindsay," Stiles piped in, stopping Lydia's pinch from happening as he anticipated it this time.

Even though Dean had thought about telling Lydia that her mother had probably just written down the first guy she could think of, his eyes widened at the name that rolled off of Stiles' tongue. Erin Lindsay. She was a detective now and Dean couldn't believe it, but at the same time he wasn't about to write off Lydia being their daughter. They'd spent a week together basically doing nothing but eating and messing around and sleeping together and it was quite possible that when he took off to hunt that ghost with his father, that he'd left her knocked up.

"Well…son of a bitch," Dean said, running his hand down his face. "Okay, look, I know you don't think that you can trust me, but come with me. I think we both need to talk this through. Is your mother with you?"

Lydia shook her head, annoyed that she felt some pain in her heart admitting it. "She gave me up for adoption. I only found out two days ago."

"Wow, okay," Dean told her, reaching out his hand to her. "Let's go talk—Stringbean can come too."

xx

Erin Lindsay sighed loudly as she made it into her place that evening, removing her red leather jacket and tossing it on her couch for now. Then she set to taking off her shoes and opening up her fridge for a beer, popping off the top and sitting on the couch to turn on the television. She wanted to see what the news had to say about the events that day, and then her phone went off and she figured that she should answer it: it was just Hank Voight. He was checking in on her after finding that gruesome body and so she texted him back and then turned to look at the door when she heard the knock.

Getting up, Erin looked through the peephole and raised her eyebrows, before everything started to really sink in with Lydia, Stiles and Dean standing there on the other side of the door. The girl looked no more than 16, the boy either, and the man was familiar, making her heart skip several beats because this couldn't be happening to her. She had thought that she had left her entire past behind and here it was at her doorstep and she knew the first thing that she should do was call the cops.

Dean was a fugitive…but she was the cops.

Besides, the strawberry blonde with him was something that she hadn't been expecting and she took a deep breath as she put her hand on the door knob. Could she even do this? She was the kind of woman to face her problems head on, but for a moment she was actually scared and at a loss for words. Lydia would want words, right? She would want to have some kind of—no, what was she doing? There was no reason to think that Dean was here and that teenager was her daughter…this could be a…no…Erin didn't believe in coincidences.

"We know you're in there," Lydia said suddenly as Dean went to knock again, Dean pausing and looking at her.

Dean chuckled. "And pray tell how do you know that?"

"Her shadow under the door," Lydia replied with a sigh. "I am beginning to believe that my intelligence came from her."

No, Lydia was definitely their daughter.

Even with that fear gripping her, Erin took a deep breath and she opened up the door, looking at the three people outside. They were staring at her, Dean feeling his heart palpitate as he looked over the attractive woman, nodding because she was definitely his Erin. Lydia was gripped with a sudden fear too, looking into the face of her biological mother as Stiles whistled, Lydia elbowing him once again.

"That happens a lot," Dean commented, Erin nodding even though her eyes were only on Lydia.

Lydia opened her mouth but Erin beat her to it. "You're my daughter."

"Yeah…my name is Lydia," Lydia said with a nod. "You had a kid with a criminal."

"I am wondering whether or not I should arrest him," Erin agreed, looking at Dean and then looking at Stiles. "Besides, I know you're name…I picked it out. This kid?"

"Stiles," Stiles said as he held his hand out to shake Erin's, Erin gripping it tightly.

Erin nodded and then motioned inside. "Come on in…though…you…"

"He can explain," Lydia said quickly, not wanting a fight to happen. "We all just deserve some answers…"

Note: Alright, this is just the beginning and I hope that you guys stick around and cut me a little slack because Erin Lindsay is a work in progress when it comes to writing her as only one episode of her show has aired. Feedback is always appreciated!