I'm not a Stark
You were a mutant, a S.H.I.E.L.D agent and the founding member of the Avengers. Your powers to control the elements had you on S.H.I.E.L.D.’s from when you were very young, you were eventually brought in at the age of 21, after an incident with the criminal organisation S.P.E.C.T.A.R.E. and an MI6 agent. You were also the illegitimate daughter of Tony Stark, not that he cared. Though you talked to Pepper regularly, she kept it a secret that you were a S.H.I.E.L.D agent.
When you first joined the Avenger initiative you were introduced to Agent Romanoff, and you two hit it off immediately. The two of you were great friends, both of you developed crushes and neither of you knew what to do. Natasha wasn’t sure at all what to do, she was trained to not feel this. But she did. She bottled it up until she was certain you liked her back. She kept note of every subtle glance, touch, until she was certain. You found her much harder to read. You couldn’t tell if she liked you or not, so you decided to let her make any move.
One night the two of you were walking back to your place after you went to see a movie. Natasha noticed the way you looked at her in the street light. She took her chance. She pressed her lips against yours and kissed you gently, she felt relief spread through her as she felt you kiss back. The two of you walked back to your apartment, hand in hand.
3 years later you were still together, living in a little house the two of you had bought, when Pepper called. It was soon after the revelations that Tony was Iron Man, and he actually wanted to try being your father. Which was odd seeing as you were 25 by this stage and an internationally renowned Super Hero. But you went along to lunch with him none the less, and Tony really did try, but you were thankful Pepper was there.
You found out he was dying when you got home. Natasha had just been assigned to go undercover in Stark industries. Which was a kind of relief to you as you had been invited to stay with Tony for a while. Natasha found the glares you gave Tony whenever he flirted with her adorable, she particularly enjoyed it when you snuck into the apartment S.H.I.E.L.D had rented for her to stay in.
It was in the dohnut shop with Fury and Natasha, when everything came to a head. He glared at you the entire time, you played it off, not really paying attention to him. Much to your annoyance Fury gave you and Tony some space. Natasha gave you a supportive look before leaving to waiting for you outside.
“So you knew about Natasha”, he said as looked at you blankly.
You looked at him before taking a breath “Yeah, she’s my girlfriend”.
He took a shaky breath “You chose your girlfriend before your own family”.
You looked at him with shock and anger written on your face. “No I chose the woman I love over the man who only wants to be my father because he is dying and feels guilty”.
Tony stood up angrily, “Now you listen to me (y/n) Stark”.
You laughed, “Oh my God you don’t even know my name, its (y/n) (y/l/n), I never took your name” you said as you turned your back to him and walked towards the door, “I’ve always tried my hardest to not be a Stark” you spat as you walked through the door and drove in silence with Natasha to Tony’s house. There you reluctantly helped him build that element and from there you took down the drones, with Natasha’s help of course.
You tried to leave without saying goodbye. But the two of you were stopped by Pepper of all people, she made you and Natasha promise that you would come over for dinner sometime. You kept that promise.
It was 3 years later, just after the incident with Ultron, when Natasha walked into Tony’s lab.
“What do you want Romanoff, if you want anything built you should just ask (y/n) I’ve been banned from making anything non suit related”, he said not looking up from the computer screen.
Natasha took a seat on the bench behind Tony, “I want to ask you a question” she said, her voice not betraying how nervous she felt.
Tony turned around to look at her, “And that is” he said gesturing for her to carry on.
“I would like you permission for me to ask (y/n) to marry me” She said as her thumb nervously rubbed the ring she had in her pocket.
“It’s about time, sure, go ask her” Tony said as he turned back around to his computer screen. His heart breaking, he had just gotten his little girl back in his life and trusting him, and now she was being taken away. He knew she was with the right person, anyone could tell that, but it wasn’t much comfort.
The proudest day of Tony’s life was when he walked you down the aisle. The second most proud moment was when he heard the phrase “Do you (Y/N) Stark take Natalia Alianova Romanova to be your lawful wedded wife”. He had no idea that you had changed your name to Stark. His third most proud moment was when he saw you sign you name on the marriage certificate as (y/n) Stark-Romanoff.
You were definitely a Stark.