Dean's Pov:
We have just been told by chuck/god that john has a daughter. So that means we have a sister we never knew about.
Way to go dad!
We found out she lives in new mexico. So we decided to go pay her a visit.

"(Y/n) (L/n) according to her facebook page. Works at a bar/restaurant called Hard Rock café?" Sam says.

"Seriously?" I questioned.

"It's says it clearly in black letters."

"I don't know Sammy maybe god's got the wrong Winchester family."

"Dean. It's god." Sam reasoned.

We drove to the café and when we got there music was blasting.

"You sure this isn't a club Sam?" I asked.

"I am pretty sure."

We went inside the music was 10x louder.

"Welcome to Hard Rock Café how may i help you?"
The host asked.

"Looking for (Y/n) (L/n)." Sam says.

She pointed to a girl:
(Your outfit)

on stage she looked nothing like dad.
But she was playing an electric guitar signed by bon jovi she was the lead singer as well. She was singing Carry On My Wayward Son By: Kansas

"This has to be a joke." I chuckle.

"How?"

"She has no resemblance of a Winchester whatsoever and she can sing Sam who in our family can sing like that?!"

"Um me." A feminine voice said behind me.

When i turned around and there she was.

"(Y/n) (L/n) i'm-" i start.

"Pretty boy and Jolly green giant aka my brothers Sam and Dean Winchester."

I stood completely shocked.

"Yea you got your sources but your sources are my alliances. Nothing gets past me. Look if Dad sent you to talk about getting me into the family business then you can tell him to shove that idea far up his ass because i'm not doing it k? Good talk. Move along." She said leaving.

"She's got your smart mouth that's for sure." Sam said.

"And taste in music."

"(Y/n) wait!" Sam chased after her and of course i had to follow.

"What do you want from me?" She asked.

"Dad died a couple of years ago." Sam said.

"Well i'm very sorry to hear that."  She replied with little to no emotion.

"That was your father too!" I said.

"Yea but i didn't even know the old man ok he only came to visit when he felt like it.So if he sent you here to check on me as some final wish you can leave because I'm not oblivious,  i can cover my ass and i don't want or need protecting. This is my ground nobody disrespects me here ok? Now with all due respect get out of my life and never come back." She turned around and walked away.

"I got this." Sam said walking towards her. They talked and i watched as her face went from pissed and annoyed,  to sypathetic and a bit guilty. Sam said something and she agreed?
Sam came back.

"So?" I asked

"She agreed to meet us at a nearby diner tomorrow."

The next day...

Your pov:

I ran into the diner and sit at the table. "Sorry i went on a jog and lost track of time." I apologized

"It's ok." Sam said.

Dorthy my normal server comes over. She's also like the only person i could call family here since both of my parents are dead. She's like my mom.

"Hey hun." She said.

"Hey Dorthy."  I say smiling.

"Who are these two hunks?" She joked.

"My brothers,"I said and she looked at me shocked. " Yea, we'll talk."

"Well what can i get you boys?"

Dean got a burger and Sam got a grilled chicken salad.

"The norm for you girly?" Dorthy asked.

"I'm on a diet again so give me my health nut choices." I joke

"You had the mandarin chicken salad last time.. So rather greek salad or chicken Caesar wrap."

"Which one is more low carb and low cal?"

"The wrap."

"Then i'll go for it."

"Is this all together?"

"Depends on how this conversation  goes." I say.

"Alright i'll be back."

"So let's cut the small talk and get to the nitty gritty. If dad didn't send you and you had no idea I existed. Why are you here?"

"We could really use an extra set of hands here. These hunts aren't getting an easier-" Sam said.

"So you want me to start hunting?"  I scoffed. "Unbelievable,  I told you i'm not gonna start hunting i'm happy being the latest prodigy of University of New Mexico School of Law graduated top of my class. I am currently looking at 10 different law firms that want me. I love my life! I get up everyday go on my normal Jog then come to the diner for  breakfast and then-"

"(Y/n)!" I turned around to see my boyfriend Donny who i went to college with me.

"Hey babe!" I say he comes over and gives me a kiss.

"Who are these guys?" He asked.

"My brothers..."

"Brothers?" He asked.

"Yea....brothers,  so as i was saying i have a life here one that i'm happy with so you guys don't have to worry about checking on me. I'm fine here and i'm not leaving."

Dorthy came out of the kitchen balancing two trays.

"So um they are..." Donny started.

"Oh right these are my brothers Sam and Dean Winchester."

"Winchester?" Donny questioned.

"Yes,  Winchester." I say.

He suddenly got a malicious smirk on his face and his eyes went black.
"I chose my victim wisely then." He said.

"Not really." I say.

I took my hidden angel blade out and plunged it through his heart.

"I told you Donny..Nothing gets passed me."

Suddenly other Demons stood up from their tables and came at me Dorthy and the rest of the workers took out their blades as well and started kill them off.
Soon every last one of them were dead.

Sam and Dean stood intrigued.

"I always knew Donny was too good to be human." I say wiping the sweat off my forehead.

"What just happened?" Dean said.

"Let me introduce you to my family." I say.
"Dorthy is like momma bear of the group. Paul the guy who gave you information on me is our researcher/Tech center he also keeps tabs on who comes who goes. Basically everyone in this restaurant is a hunter. Well except the customers." I say.

"So you were a hunter this whole time."

"I had to hunt down my mom's killer one way or another sooo yea. Which i finally got him i knew Donny always seemed too nice."

"What about the whole 'tell dad to kiss my ass i'm never going hunting.' Thing."  Dean said.

"Donny always had someone watching me and i knew if i attacked i'd never get to him so i had to put on an act i guess my acting classes did come in handy."

"(Y/n) we got everything from here." Dorthy told me.

"Thank you Dorthy i don't know how i could've done it without you." I say hugging her.

"I knew you were gonna be my toughest little student." She said smiling.

"Student?" Sam question.

"Dorthy taught me how to fight, So if you guys ever get possessed don't worry your size or height is no threat to me at all." I say smiling innocently.

"So are you saying-" Sam started.

"Yea,  i'm coming just needed to handle a bit of business here first. So let's go."

We drove to my shared house with my housemate who was thankfully gone. If she had seen Sam and Dean let's just say........you would have seen desperation at it's finest.
I got what little belongings i had and we drove to the bunker. The minute Dean turned on the radio and Cheyenne Autumn by Kansas played that it was destiny that they found me and that we had an awesome future ahead of us

"Y'know i had my doubts about you being a Winchester." Dean said.

"And what about now?"

"You're definitely a Winchester."