It has happened despite the efforts of the Avengers. Half of life was extinguished from the universe within a few seconds. People lost friends, families and everything else. Even the Avengers lost their teammates, their friends, their families. When King T'challa turned into dust along with his sister Shuri, Wakanda fell apart. There was no more SHIELD when Nick Fury was turned into dust. Many more heroes died because of Thanos: Bucky, Sam, Wanda, Vision and many more.

She sighed as she slumped down on the ground with her back against the wall. She called the no. again, probably for the 15th time but there was still no answer which confirmed her fear. Her best friend was most probably gone along with his family. Tears built in her eyes as she thought about her friend cum brother: Clint. She is still alive because of him because it was him who gave her the chance to redeem herself herself when no else would. But now he is gone. She let the tears fall, because she couldn't hold them any longer. She even called Fury and received no answer, same as Clint. She assumed he was gone too, the man who gave her a chance just like Clint. She closed her eyes and cried. She cried. The Black Widow cried. She felt alone and helpless.

No. She was not really. He is still here. Alive and well. As long he is here there is always hope. He and her are friends and teammates. But a few years ago she thought maybe there was something more between them. She knew there is no chance that she will ever get something as good as a peaceful life but she still hoped for it and then all her hopes shattered. Despite all, she knew what she felt for him. It was love, which she had never felt before. That man had managed to melt the cold, dead heart of the Black Widow without even trying. At that moment she felt a comfortable hand on her shoulder. She looked up to see a concerned face looking at her.

"Nat, are you okay?" Her friend asked.

"I am alright, Bruce." She said and started to get up.

"Wait, I will leave and let you get some alone time." Bruce proposed.

Her face hardened. "We will have time to grieve later." She said standing up.

"Nat…."

"Where is Cap?" She asked, changing the subject.

Bruce sighed. "He is just there, outside. Sitting on a rock and staring towards the sky. Thor is with him too and the Racoon."

Natasha walked past him without giving him any chance to speak. She has no time to deal with personal problems now. She found Steve outside exactly as Bruce told, sitting on a large rock and staring into nothing.

"Steve…." She said and lightly squeezed his shoulder.

He didn't say anything. His head was bowed down in defeat.

"Steve…" She called again.

"They died right in front of my eyes. I could do nothing. Bucky, Sam, Wanda….. All are gone." Her murmured.

Her heart clenched at the sound of his voice being so broken. It was so unlike him. He always was being positive, being stubborn, making the impossible, possible. But not anymore. He looked exhausted and defeated. She couldn't blame him either. That man has sacrificed everything he loved to save the world. For years of knowing Steve Rogers, Natasha knows one thing about him very well: Steve Rogers will always put himself at last, even if it is going to kill him. That man is damn selfless that sometimes she wanted to yell at his face and tell him to be a little selfish. But she doubted that even with her scolding, he will change and honestly she didn't want him to either. Because that is who Steve Rogers is and that makes him the best man she has ever known including Clint. She knew how he pushed Bruce towards her. Honestly it didn't surprise her because she knew why he did it although the two of them never talked about it. He didn't even know that she knew about his involvement. She really didn't mind because she really thought that was sweet of him. If this was anyone else she would've probably decked him.

"Steve it wasn't your fault." She said truthfully.

"Yes, it was. Maybe not directly. If I wasn't against the Accords the Avengers would've remain united and maybe we could've stopped Thanos before he could lay his hands on the stones. Neither them, nor the half of the universe would've been dead by now." He spat, angry at himself.

"You can't know that. Even if the Avengers were united we couldn't have possibly stopped Thanos. He already had all the stones in his possession except the mind stone. Even the Hulk is afraid of him." She tried to calm him, comfort him.

"I am not afraid of him." Steve said.

"I know." She knelt down and cupped his face with her hands. "Hey, look at me." He did. Blue eyes met greens. "I know you. You will find a way to bring them back and undid what Thanos did. You always do."

He tried to give her a small smile but failed miserably. She saw that her words were doing no good. Still she had one more way to persuade him, to help him, to comfort him, to give him his confidence back. She felt bad for pushing him but the world needed Captain America now, more than ever. The rest of the Avengers to lead them, most importantly she needed him by her side.

"Steve will you do something for me?" She asked.

"Anything, Nat. You are my best friend." He said.

"I want you to be Captain America for one more time. The world needs you. The team needs you. I need you to be there." She pleaded.

He waited a few seconds before answering her, "I don't know whether the world or the team needs me. But for you, I will be there." He said honestly.

Natasha knew that Steve Rogers never lies and his answers caused a rise of flutter in her stomach.

"Thank you, Steve." She said, with a small smile.

"No, thank you, Nat." He said.

"For?" This time she smirked.

"For being there with me. For standing up beside me. For helping me." He said with a genuine smile. His face showed how grateful he was to her. "I was so lost without you."

His last sentence caused her eyes to widen and a gasp escape her lips. He had totally taken her by surprise and there's only a handful who can do that to her. But she quickly hid her surprise by her trademark smirk, "Any time old man."

Bruce watched the whole exchange between Steve and Natasha. He didn't interfere but he watched how she was able to persuade Steve easily. He had actually listened to her. He knew there is nothing between the two of them, but he couldn't help but feel jealous about their closeness, how well connected they are. When Natasha started to flirt with he was totally taken by surprise, but Steve had pushed her to take a chance with her. Bruce knew that despite her past, she is a good woman. He had to thought about it because there was still Betty, the woman he loved. Before he could make up his mind between Betty and Natasha, Ultron happened. Then the fear inside him won the battle and he fled. He was too coward to take a chance. But as he stayed off planet, he realized that he had really missed her presence. Her trademark smile, her red hair, red lips, her eyes. He and Thor were coming back to Earth along with other survivors of Asgard but Thanos had interrupted them. Thanos had killed Thor's brother Loki and his friend Heimdall immediately but Bruce had managed to escape. He told Dr. Strange and tony everything. When he asked about the other Avengers he came to know that the Avengers are separated because of a stupid Accord. Despite that Bruce requested Tony to contact Steve because the Avengers needed their leader. Even with his warning Thanos had won. Thanos wiped away half of the life from the face of the universe with a mere snap of his fingers. He wondered if anything happened between her and Steve when he was gone. He shook his head to clear the negative thoughts away because he knew that she and Steve are just good friends, like her and Clint.

At that moment surprising everyone, including Thor, a woman landed on the ground carrying a spaceship on her shoulder.. She was wearing a tight uniform with a Star sign in the middle of her chest.

"Where's Fury?" The strange woman asked after putting the ship down effortlessly on the ground.

"He is gone." Natasha answered, cautiously.

The door opened and out came Tony, stumbling on his feet. A woman with blue coloured skin was practically carrying him outside. Rhodey immediately went to his friend and took him from the blue skinned woman.

Few survivors of Wakanda arrived and carried Tony inside on a stretcher. Bruce followed Rhodey inside. Steve and the others wanted to go too, but they needed to talk with this woman who saved Tony's life.

"What happened?" The woman asked.

"Thanos happened." Natasha said..

"Thanos?"

"Who are you?" Thor asked, interrupting her.

The woman looked straight at Thor, not being least intimidated by Thor's large form. "Carol Danvers. You can call me, Captain Marvel."

Rhodey was back as they didn't let him inside to see Tony.

"Where were you all this time, when Thanos was kicking our ass?" Rhodey asked.

She looked at Rhodey with an annoyed expression on her face.

"There are a lot of planets beside yours and I was needed there." She then turned towards Natasha. "What did Thanos do?"

"He wiped away everyone with the help of the infinity stones." She answered truthfully.

"He has the stones?" Carol's eyes were widen in shock.

"Yes."

"What are you planning to do?" Carol asked, looking at them.

"We are trying to find Thanos." Steve said.

"You are?" Carol asked, clearly impressed by seeing the determination on the man's face.

"Steve Rogers." He said.

Carol's eyes widened. "Steve Rogers…. As in Captain America?!"

"Yes."

"Nice to meet you, Captain." Carol said shaking his hands with a small smile.

"Likewise, Captain." Steve replied.

Natasha didn't like the way Carol smiled at Steve because she knew what that smile meant. For years she had studied to read people's emotions by seeing the smallest of expressions on their faces and she could tell by the smile and of course for the excess amount of time Carol held Steve's hand in hers, Natasha could tell that this woman was attracted to Steve. And she didn't like it one bit.

"We do not know where Thanos is." Thor said.

"I know where he is." The blue skinned woman said.

"Then what are we waiting for?" Carol asked.

"What makes you so sure that we will win?" Rhodey asked.

"Because you didn't have me around last time." Carol said with a smirk.

"So what should we do?" Rhodey asked.

"We find Thanos. Get the stones and bring everyone back." Steve said, his blue eyes burning with anger.

"Just like that?" Rhodey.

"Yes, just like that." Natasha said.

"I like this one." Carol said bluntly, looking at Steve.

Even with his beard everyone could see the blush on Steve's face which he tried to hide with a straight emotionless face.

"Let's get this son of a bitch." Steve said in his Captain America voice and Natasha knew then that Captain America is back.

Note: After watching endgame, my heart broke. Natasha deserved so much more than what she got in the movie. I understand why she did it but still I felt like she shouldn't have died. So, I had to write my version of Endgame here, in fanfiction, on what could've been.

Anyways, this is my first attempt on writing a story on the Avengers and I will try my best. Won't drag the story too long. (Forgive my grammatical mistakes if there is any, not good in writing).

Don't forget to review, please.