Requested by MariaPapadopoulou74 and KiraR_, Steve is jealous. 

Steve hadn't been able to think the first time it had happened. 

I mean, how could he think when Natasha Romanoff was slamming her lips onto his and shoving him against the wall with a passion he had never experienced. 

His brain had been completely clouded by the way she whispered his name like a prayer, and when she had dragged him down the hallway to his room, he simply didn't have the self control to stop her. 

Since that night, he wasn't exactly what was going on between the two of them. 

Natasha would appear at his doorway at the most random times with a small smile and he would let her in without a second thought.

Sometimes they had sex, other times they would just sit on his couch and watch movies in each others embrace. 

He knew how he felt. He was in love with her. That was undeniable. 

He just wasn't sure where he stood with her. 

Obviously, he wanted her to feel the same, but he was worried that she was only interested in a physical relationship. 

It was driving him insane, but he didn't have the courage to ask her. 

Every time she knocked on his door, he let her in, not being able to stop himself despite knowing that it wasn't helping his situation. 

The one time he had tried to stop her, it hadn't even worked in the slightest. 

She had come to his apartment at nearly three am, which meant one of two things; she had just had another terrible nightmare and wanted his company, or she wanted sex.

This time in particular, it was both. 

He had opened the door and found her standing on the other side of it with shaky hands and pale skin. A thin layer of sweat laced her forehead and he knew she had just had a nightmare. 

"Come here," He whispered, holding out his arms and closing the door behind her as he embraced her. 

For a moment he let himself imagine she loved him back. 

"I hate them so much Steve," Natasha whispered softly, her hands clutching onto his white t shirt. 

Steve sighed and held her tighter, stroking her back lightly, "I'm sorry. Do you want to talk about it?"

Natasha shook her head, "No."

Steve nodded, "Okay. Do you need anything?"

Natasha pulled away from him for a moment and stared into his eyes for a moment, her pupils dilating as she bit her lips, "Yes. You."

Before Steve could say anything, Natasha was pressing her lips against his and walking backwards towards his bedroom. Her lips eventually left his and she moved to his collarbone. 

Steve's mind was clouded with desire but he tried to find the words to stop this. 

"Nat-" He whispered, "What are you doing?"

Natasha pushed him back onto his bed and crawled over him, "I need to feel that you're still here Steve. Seeing isn't enough right now. Just please, take my mind off it Steve."

Steve looked into her eyes for a moment and couldn't deny her. She still looked so frightened. Whatever that dream had been must have really shaken her....and yet within the frightened look in her eyes there was still something that almost looked like love. 

So he did as she asked, bending down to kiss her softly again. 

That night it was different then normal. They hadn't just had a lusty night full of passion like some of their other nights together, instead, it had been slow and sensual. 

It made Steve love Natasha even more and he figured that if he didn't tell her soon, it would just slip out, and he certainly didn't want that. 

A few weeks later, the Avengers were all being forced to go to one of Tony's parties. 

This one was louder then normal and Steve swore the amount of people tripled every time he came to one of these. 

His eyes scanned the small room and he tried to spot Natasha among the sea of drunk bodies. 

She was the only thing that made this parties tolerable. 

"Steve! You made it!" Tony yelled drunkenly, stumbling over to him. 

Steve greeted him halfheartedly, "Hey Tony."

Tony slung his arm around his shoulder and gestured around the room, "Cap, this is your chance to get laid. Look how many hotties there are! I'm sure you can get at least one of them to bang you." 

Steve shook his head, "I think I'm good Tony. I don't need a one night stand."

Tony shrugged, "Suit yourself."

"Have you seen Nat?" Steve asked before he could walk away. 

Tony pointed to the bar where she was sitting besides Bruce, "Yeah she's been over there seducing Bruce for a while now." 

Steve clenched his jaw and he watched as Natasha smirked at Bruce. His face turned red with anger. 

Was she really trying to seduce Bruce? Was that why she was only at his room some nights? Because she had other lovers?

Steve tried to tell himself that Natasha wouldn't do that. She knew Steve wouldn't have wanted that and if that was the case, she'd have made sure Steve knew. 

But even with that voice in his head telling him that it was stupid to be jealous, he wanted to go over to Bruce and throw him across the room...he could handle it. What's the worst that could come from it?

He continued watching Natasha seemingly flirt with Bruce until he couldn't handle it anymore. 

Steve walked over to the bar and grabbed Natasha's hand not acknowledging Bruce, "I need to talk to you."

Natasha stood up and followed Steve out of the main room until they were isolated in his office, which happened to be closest to the living room. 

"Hey," Natasha said with a smirk once he closed the door and locked it. 

Steve shook his head and sighed, "Nat what the hell are we doing?"

Natasha's eyebrows furrowed, "What do you mean?" 

"I mean what are we doing? We spend almost every night together, we go out all the time, and I don't think I'd know what to do if we weren't talking twenty-four-seven. But then I come here and it looks like you and Bruce have something too," Steve paused and sighed. He didn't want to accuse Natasha of anything, he just wanted to know what they were.

"I just want to know what you want from me," He finished quietly, looking down at his feet. This conversation could potentially mark the end of the best few weeks of his life and he wasn't sure he was ready for her to reject him.

Natasha stared at him for a moment, her eyes searching his, "What do you want to give?" 

Steve looked up at her, "Everything Nat. I want to give you everything I have."

Natasha sucked in a breath of air and she took a step towards him hesitantly, "Why?"

"Because you're my everything Natasha. I couldn't live without you. I love you," He said earnestly, caressing her cheek softly as she gazed into his eyes. 

Natasha looked unsure how to respond and Steve was sure she was about to tell him that she didn't feel the same. 

"I think I love you too Steve," She whispered, "I'm not very good at the whole relationship thing though. So if you want to try it, I'm all game...but I can't promise I won't fuck up at least twice a week." 

Steve laughed, partially out of relief and partially from pure joy, "I don't care. As long as I have you by my side, we can figure it out." 

She smiled and Steve bent down to kiss her again. 

"So you were jealous of Bruce huh?" Natasha asked with a smirk. 

Steve shook his head with a laugh, "Shut up."

Natasha grinned and wrapped her arms around Steve's neck, her eyes full of desire, "Make me." 

He did. 

Hey guys. I hope you enjoyed this update. I had a lot of fun writing it so hopefully you guys enjoyed reading it. 

Like always, please vote and comment your thoughts, I love reading your comments. 

Have a great day and stay healthy guys!