A/N: Hello fanfictioners! This is my third Avengers fanfic and I'm very excited to see what you guys think about it. I won't give much of an intro because I'm too excited! Enjoy!

Disclaimer: I do not own Disney, Marvel, or The Avengers, just Effie and her quirkiness!

I wasn't quite sure who the other two were. Just that Tony Stark had claimed I was his long lost sister. Well, this could get interesting.

Chapter One:

"Stark," Natasha Romanoff said, as she slid a file in front of him.

"I'm kinda busy here," He said not looking up from the Funny papers.

"This is important." She said, hardening her gaze. He looked at the file and back up at the agent.

"Consulting hours are between 8 and 5 every other Thursday. I don't care what SHIELD wants me to look at today. The Avengers are assembled, Pepper and I are finally at a steady point in our relationship, and I just don't care what Fury wants me to look at." He rambled as he flipped the page.

"How about your father?" she asked before storming out.

Tony looked back down at the thick folder and noticed the lack of SHIELD insignia. He sighed as he put down his newspaper and opened the folder.

EUPHEMIA "EFFIE" MARGARET STARK read the name at the top of the document.

"What. The. Hell?" Tony yelled. Reading the information quickly, he found she was born three and a half months after his parents died, March 17th. There was a VHS in the thick folder and he quickly wired together a make shift VCR.

"You didn't think you were the only one Tony?" The sound of his father filled the air. He looked up to see his father in front of the camera.

"Well, I guess I should explain. I know there is a hit out on your mother and I. I won't let her know, but I dropped the idea of having a surrogate mother. Your mother wanted a little girl. The procedure was risky and very pricey, but I was willing. Your mother is too old to have children at this point. Hopefully, this will get to you on the exact date I asked." His father paused.

"I wanted your sister to grow up, living a normal life. After all the enemies I've made, she could be seen as a potential hostage or leverage. I've paid the surrogate mother to keep her, and if it is sometime around March 15th, I need you to go and collect your little sister. She should be in Chicago, or wherever SHIELD has tracked her to. Give her a nice car, buy her new clothes and treat her like a princess. I just wish I could have been there. There was no avoiding death."

"She will named after your mother's great grandmother. And her middle name belongs to a friend of mine. Peggy Carter." Howard said sadly.

"Don't treat her like I treated you. I wanted you to be successful, and get everything out of life. I'm sorry I wasn't there when you needed me. And apologize to Effie for me too. Goodbye son, and take care of her." Howard Stark said. And the film cut out.

"Pepper!" Tony yelled as he ran to the other room.

A Day Later In Chicago

"So, um. How do I do this?" Tony asked nervous as Natasha led them up to an apartment building.

"Well, maybe don't be yourself, for starters." She said as Pepper chuckled lightly at Tony's side.

"Stark, there is a girl in there. A 22 year old girl, who has no idea who her real parents are. Are you going to just stand there like an idiot or introduce yourself?" Agent Romanoff said, knowing the feeling.

"You're right, I mean my Dad wouldn't lie to me." Tony said sarcastically, pushing past Natasha and quickly ascending the floors to the top. Knocking quickly he stepped back to find Natasha and Pepper by his sides.

"Coming!" A feminine voice could be heard from the other side of the door. It swung open a moment later to show a tall, thin brunette, with ocean blue eyes. Her brows furrowed in confusion, causing the bandage on her forehead to wrinkle.

"Miss Thompson?" Tony asked, using her fake name.

"Uh, yeah. Am I in trouble?" She asked, confused as to why three people were looking for her.

"No, quite the opposite. It would be better if we could talk about this in private." Pepper said, gesturing to the hallway.

"Yes, come in." She was wary of the three people that entered her apartment. She checked inconspicuously to see if her Taser was still where she left it.

"That won't be necessary Miss Thompson." The red head said from behind her.

"You understand that I just invited three strangers into my apartment. It would give me a little piece of mind." She said, lowly. The red head nodded, knowing that she wanted security.

"So what is this about?" She asked as they sat on the couch and Tony rubbed his hands together. He took the file that Natasha had given him the day previous, and placed it on the coffee table in front of Effie.

"I don't understand." She said before she opened it up. "Wait, that's my name! Or partly."

"We both were kept in the dark Effie." Tony said, as she started to get angry.

"So what is this? What do you want from me? A kidney?" She said as she put the file down.

"No, we simply want you to understand what we are trying to say, what I am trying to say." Tony said, as she paced.

"Are you my Dad or something?" she asked confused.

"No! That would be weird. You are my sister, Effie Margaret Stark, who I didn't even know about till yesterday."

"So, we only share the same father?" She concluded.

"No. In-vetro fertilization was beginning to come around before you were born and Dad had both his stuff and Mom's stuff put into the woman that gave birth to you. You are a whole Stark. You are my sister." Tony said, finally admitting to himself that he had wanted another sibling.

She could only stare, and wonder.

Effie's POV:

So, here is how it goes. I'll explain my side of the story and then we get back to my 'present day'. I was raised in a good home, by a single mother. She would always say I got my looks from my father's side, which now I know, was a blatant half lie.

I'm not your average girl. I'm not a hipster though I wear those glasses, or one of the cool girls that knows everything there is to know about clothes and how to accessorize. I've got a bit of nerd, a bit of girly girl, and whole lot of quirky. I'm just very particular about some things. My music, my movies, my books, my kickboxing, martial arts and my tea habits have all been a part of me for years. I can't pinpoint where I got these quirks, but I just understand that they are me. I mean, they are what make me, me. Growing up with a single mother, no siblings and your cat as your only real companion, got pretty lonely.

I was always that nerdy girl, nose buried in a book, and spewing out random information like Hermione freaking Granger. That is me, essentially. I had two best friends when I started high school. Jake and Robert. They were my heroes whenever someone tried to ridicule me, even though I could kick their ass from there to Timbuktu. Jake was the tall, dark and handsome guy every girl wanted in school, but to me he was the most immature best friend I would ever have. Robert was more down to earth, and reasonable. Once I had read the whole Harry Potter series, I dubbed us the Golden Trio. Lame, I know. But those were the fondest memories I have of them.

Now, I was graduated from College of Non-Existent, earning my big fat load of nothing degree, and working two full-time jobs to keep up with the rent demand of Chicago. I work as a clerk in a bookstore during the day and I work in a bar, serving drinks at night. Not the safest, but most guys tend to leave me alone. I'm not exactly the prettiest thing to look at. Five foot 8, brown hair, blue eyes, and an okay figure.

Back to my present. I'm working almost non-stop, when I'm pulled from both jobs because at the bar, I don't draw in more customers. The bookstore went under because of crappy management, and now I have to find a miracle so I can keep my apartment. If I don't, I'm out on the streets in three days.

Tony freaking Stark shows up at my door, flanked by two gorgeous women, and basically hands me a file. I wasn't quite sure who the other two were. Just that Tony Stark had claimed I was his long lost sister. Well, this could get interesting.

"Now, what do you want me to do with this?" I asked, confused why he would tell me now.

"You had the right to know who your real parents were. Oh, I forgot to introduce myself. I'm Pepper Potts, Tony's girlfriend and the co-CEO of Stark Industries." The strawberry blonde one said.

"Well, its great that you told me but I just don't know what to do with this. I barely know you except for what I see on the news and in tabloids." I said, scratching my head and pinching the bridge of my nose.

"I thought we could start to get to know each other. I want to bring you back to New York. You'll have your own floor in the Tower and you can have all the space you need. I'm not asking you to give up everything." He said, being completely serious.

"Um, I just don't know. I mean my 'mom' still lives outside the city, my friends… I have a whole life here."

"And those final notices of eviction, mean nothing." The red head said from her spot, leaning against my living room wall.

"Now we've come to snooping. Seriously?" I asked the red head incredulously.

"It's my job to know my surroundings." She said, raising an eyebrow.

"Crazy job." I muttered, turning back to Tony and Pepper. "What do you want from me?"

"I want to get to know my sister, and for my sister to know me."

"I know you are Ironman, I know you helped save New York from an alien invasion, and that we are related." I deadpanned.

"Please just give me a chance." He pleaded.

"Is this for you or for our parents?" I asked.

"Both. They would want this, but I know from that file that you've been alone in the world, not knowing who you are, or where you fit in. You've moved from three apartments in the Chicago area in the last two years and had an extensive list of jobs, that all only lasted two months. Managers couldn't understand you, because your IQ is off the charts, and you try to hide that from people. You deserve a place where your skills are valued. I know that you are passionate about science, advanced mathematics, and English. You've mastered five languages not including English, and you only have ever been close to two people in your life. Not including your cat."

"Well now you know everything, so I doubt you'll need me now." I said getting up and making myself a cup of tea.

"Please just think about this Effie." Pepper said, placing a hand on my shoulder.

"I like control okay. I like knowing every possible outcome before I make a decision. It's just something I do." I said turning and putting the kettle on.

"I drink tea when I'm anxious or frustrated, scared or cold. I let my cat steal most of my bed because I know she doesn't have a whole lot of time. The thought of putting her in a plane scares me cause she might have a heart attack." I rambled.

"Effie, just breathe. I can have you and her driven to New York, or on a train to New York. I'll take what I can get." Tony said, smiling.

"I don't know." I said biting my lip and pouring the water into my mug.

"You can trust me. I'm your big brother, and I'm going to do everything in my power to make you happy and safe." He said, putting one hand on either shoulder and gave a gentle squeeze.

"Can I think about it tonight? I just want to sleep on it." I said, taking a drink of tea. He nodded and leaned to give me a hug. I responded slowly, and while it was slightly awkward, it still felt right, and warm. A brother, I had a brother.

A/N: Well that was the first chapter! Let me know if you guys liked it :)