Pairings: Tony/Pepper, Tony/Natasha, Steve/Bucky, Bruce/Betty
Bucky was having a birthday party for Steve. He decided to invite all the Avengers and thier immediate family. That would mean that Tony would bring Pepper and Natasha would be alone. She was used to that, as well as being undercover. She was a natural at it, so no hard feelings that Pepper was Tony's date to Steve's birthday party. She was his wife after all, but she wished she was his date instead. In the end she was still fucking Tony on the side and she was more than fine with it.
Tony held the door to Steve and Bucky's house for his wife. He kind of hoped that Natasha was already there, so that he could try and sneak out to talk to her while Pepper was helping Bruce's girlfriend Betty in the kitchen. He would make the accuse to his wife that he needed to talk to Natasha about upgrades for her suit. He only wanted to see her because she had a mission and he didn't see her for awhile. Tony stept inside after Pepper and saw that Natasha was indeed there.
He smiled when he saw her, Tony thought she looked beautiful in anything she wore. Today she was wearing a knee high length maroon dress, which Tony had to curse at himself in his mind when he laid eyes on her. He knew he had Pepper, but he could never stop wanting to have Natasha. Pepper pulled his hand to the group that was standing around. Natasha, Clint, and Bruce were standing around when Tony and Pepper showed up. "Hey guys, we came to crash the party. Where's the birthday boy?" Tony asked as he got Natasha's attention
"He's in the kitchen with Bucky, and Betty." Natasha answered looking into Tony's eyes.
Tony nods "Do they need any help, Natasha?" Pepper asked as she put her purse on the floor by the tan couch that was in the living room
"You can go and see, if you want to. I don't do kitchens, I would only be in the way." Natasha lied, she was a great cook and Clint knew it. He gave her a weird look before Pepper stept out of the room. Natasha just shrugged it off like nothing, she just wanting to hang out with her boyfriend while his wife was in the other room.
Clint looked at Natasha "What the hell was that?" he asked
"I didn't want to be caught up in the kitchen, that's all."
"Wow, that's the first."
Nat looked at Tony and Bruce "Would you guys go say hi to Steve and Bucky for a minute please?" she asked the other two men
Tony had a really confused look on his face and so did Bruce. "Yeah, we can do that." Bruce said as he turned around to leave.
Tony looked at the two assassins "Don't forget Romanoff, I need to talk to you about the suit upgrades before the night is done." Tony stated
"Yeah, we will. After I talk to Clint about something real fast." she said with gentleness
Tony nods "Come and get me when you're done your conversation." he turned to go to the kitchen
After the two men left she turned to Clint "Okay, there's something I need to tell you. Before everyone else finds out or if they ever do. Keep it down and a secret, which I know you can do both really good." she whispered
"Are you pregnant or something?" He asked whispering wanting to really know if she's okay
She smiled "What? No... I can't remember, because of what happened at the Red Room. Anyway I'm having an affair with Tony, don't you dare say anything." She whispered
His jaw dropped "Seriously, Stark? What do you see in him?" Clint asked still whispering
"He's not the asshole I once thought he was. I swear don't say anything unless if you want Laura on your case about it."
"I won't." the archer put his arms up in defense
Natasha smiled "Good. Now I'm going to go ask my boyfriend about the upgrades about my suit." She patted her friends shoulder
"Yeah, you do that Nat." Clint stated watching her walk towards the kitchen
Tony and Bruce were having a conversation about something to do with science. She smiled as she walked in, Pepper was busy with Betty. Natasha looked back at Tony. "Hey, Tony. Can I talk to you about the upgrade on my suit?" Natasha asking as she lied and Tony knew what card his girlfriend was playing.
Tony faced her and smiled softly "Sure, you just say the time and I'll be there." Tony lightly flirted with her but Pepper didn't care
"Is right now okay, somewhere private so that our team wouldn't get jealous about all my upgrades." she smirked
"Right now sounds perfect agent Romanoff." he only called her that when he was either flirting with her or when they were on a mission together.
Natasha nods before walking out of the kitchen waiting for her boyfriend to follow. Tony did follow her right away. "Where should we talk?" she asked
"Somewhere no one would see us." he winks softly as his eyes went to her gorgeous breasts.
"Is the garage okay?" Natasha asked, he nods softly at her. He followed her to the garage knowing that they don't use it all the time. It was the one spot in Bucky and Steve's house where they wouldn't be bothered.
Once they got to the small garage, Tony opened the door for his girlfriend, for her to go first. Tony shut it behind him and wrapped his arms around her slim waist. "When should we come out with the affair?" Tony asked his girlfriend
Nat looked into his brown eyes "Whenever you're comfortable love." she cupped his face, he leans into her touch.
"How about when Pepper comes home from the SI conference that's going to be in Miami?" he suggested "I'm sick of being in this fake marriage... I want to be with someone who I actually want to spend my time with. You're that person for me, we knew eachother for a few years and we've been dating for a few months. I really really love you Natasha, and I don't think I'll ever stop. I hope you didn't think we were down here to talk about upgrades." he looked away not really sure what the spy would do.
"I don't think I'll ever stop either, I've fallen deeply for you Tony. I just have this attraction towards you, I know a lot of different women do as well. I'm different from them, I actually know you for you and I would never hurt you on purpose."
Tony leans into kiss her passionatly as he dry humps against her front. They both moan together in unison. "I wish you could fuck me and get away with it." Nat whispered against his lips as they continued kissing.
Tony pulled away from the kiss "Me too but I can't because of the dress. I promise, next time we'll fuck okay. We'll be at the mansion, besides we have to go back before they end up looking for us."
"You always make it worth the wait love, you're great at that. We should get back to the party soon, but first I want some more kisses. I missed your lips Tony." Tony leaned down to kiss her a few more times
After they pulled away, Tony looked at his girlfriend lovingly. "I missed you too, my darling. We should go back to the party...even though I want to stay here with you right now."
They leave the garage and went back to the kitchen together. Of course Tony wanted to tell them that his marriage was fake right then... He and Natasha never talked about it. Then he stopped her from walking into the kitchen. "Nat, maybe we should just come out with it... Steve will forgive us."
"He won't forgive you but he would forgive me... Yeah if you want, but what about Pepper?" she asked
"Let her do whatever because I can't help the way that my heart feels." she nods and walks into the kitchen, he followed shortly.
Pepper smiles at her husband "Where were you?" she asked being courious
"Do you want the truth, or not really?" he said before he could stop himself. Natasha and Clint shook their heads
Pepper looked at him worried "Yes I want the truth, Tony what happened?" she asked reaching for him but he didn't let her touch him, she frowned a little bit from his actions
"Uh, Natasha and I are having an affair, I can't physically be with you anymore. I'm sorry, this is like the worst timing." Tony blurted out, Clint, Bruce, Steve, and Betty shook their heads at the billionaire.
Pepper gasps looking at her husband and she didn't tell him yet that she was pregnant but now was not the place for it. She wouldn't have to tell him if she never saw him again. "Fuck you Tony! I thought you were done being a playboy... I'll be planning to move my stuff out along with getting the divorce papers." she looks at Nat "You think you're going to be all happy and in love now with him, he'll probably do the same to you." Pepper spat out towards Natasha
"I can take care of myself, thank you very much." Nat explained to her
Pepper walked over to Tony slapping him hard before slipping off her ring to hand to Tony. He rubbed his cheek with one hand "You keep it till the press conference announcing the divorce. Take it off infront of the reporters. Christine Everhart would love that."
"Fuck you Stark," she walked away from the couple to go apologize to Cap. "I'm sorry if I ruined your party, but I can't stay here right now. I'm going to go to one of my friends house for a few nights." Pepper apologized to them before leaving.
"Really? You decided to have an affair with Nat?" Bucky asked looking at the couple
"My marriage with Pepper was arranged by Howard. I never wanted to marry her, she only wanted me for the money and my father knew that. I told him before that I didn't want to be with her. Natasha isn't the first one that I had an affair on when I was with Pepper, but I wasn't really serious about any of them until Natasha came along." Natasha walked over to Tony, slipping her arms around his waist
"Do you think you did the right thing?" Cap asked him
"I belive I did, I'm a lot happier with Natasha." Tony kissed her head softly
"That's all you can do... well should we get back to the party?" Bucky asked his husband
"I belive we can, let's enjoy the party." Steve smiled
For the remainder of the party Tony and Natasha were smiling at each other a lot because they both arrived at the party as non dates and now they're each other's date. Tony was happy that he didn't have to hid his relationship with Natasha from the team at least. He could finally hold her and kiss her whenever he wanted to.