How to Stop Fighting Cousins pt.1(Steve Rogers x reader x Tony Stark)

                                    

                                          
                  
                          
To say that you and your cousin fought was an understatement. You two argued to the point that the rest of the team would find any excuse to leave when you and Tony were in the same room together. You were his opposite in nearly every way and as a result, the two of you butted heads more often than not. Most of the fighting was caused by Tony's infamous ego and his insistence that he knew better than you. Needless to say, the team was fed up with the constant bickering and were trying to find a way to put an end to it. 
                          
                "We could lock them in a room together until they stop," Sam suggested folding his arms over his chest. Steve immediately vetoed that idea. "My wife is claustrophobic. I'm not putting her through that." You were in the gym and Tony was out of the tower with Pepper for the day. "Let's put them in a Get-Along-Shirt. It's what I do with my kids," Clint said. Loki, who had been silent until that point, scoffed. "Truly, your intellect is a thing to behold. Will this plan not simply cause them to quarrel more?" They all turned to face him. "You got a better idea?" Loki's stoic expression changed into a devilish grin. 
                          
*Time skip to the next morning*
                          
                You woke up to a girlish scream echoing throughout the tower. You bolted up in bed. It took you a moment to realize that you weren't in your room. "What in the world?" you asked yourself and turned to look at Steve, only it wasn't Steve in the bed next to you. It was Pepper. You were in Tony's room, in Tony's bed. Another scream brought you from your thoughts and woke Pepper. You threw the covers back and made for the door, passing a mirror on the way. You caught a glimpse of your reflection and stopped dead. The face looking back at you wasn't your face. 
                          
                "TONY!!!" you screamed at the top of your lungs with his voice. You ran into the kitchen and found Steve sitting at the counter, blushing furiously. Across the kitchen you saw Tony in your body. His eyes were wide and he kept opening and closing his mouth resembling a fish. "What did you do?!" you asked him or rather screamed at him. He said nothing, just kept opening and closing his mouth. The rest of the team sat around, chuckling. You ran your hand over your face, cringing at the feeling of Tony's facial hair. It made you very glad that Steve was clean-shaven. "I do not believe that this is Brother Stark's doing, Lady Y/N," Thor commented. 
                          
                You turned back to Tony who finally managed to speak. "I've seen things that can't be unseen," he started softly. You noticed your husband's blush deepen as you recalled the events from the previous night. You felt your own cheeks heat up as Tony cried, "I woke up next to a naked Spangles! I will never be able to get that out of my head!" The rest of the team couldn't control their laughter at that. "If Tony didn't do this, who-" you cut yourself off when the likely culprit entered the room. "LOKI!" The God of Mischief smirked.
                          
                "You did this, Reindeer Games?" It was odd seeing yourself talk. "I did. I hoped it would end the endless squabbling between the two of you." You could see the heat rising in your body. "Hey, Tony. Calm down before you hurt yourself." Your powers of elemental control were dangerous when your emotions went wild. "Fix it, Loki. Change us back," Tony threatened. Loki's smirk fell. "I am afraid that I cannot. I seemed to have miscalculated and I cannot undo the spell. You will simply have to wait until it wears off." Keeping your temper in check, you asked, "And how long will that be?" Loki shrugged. 
                          
                "Tony, how do you work the suit? I'm gonna blast him!" You were angry, but Tony now had your powers. Sam and Natasha took both your arms and led you away from Loki. All Steve had to do was pick Tony up. "Look, you two brought this on yourselves," Natasha said, "And you're just going to have to deal with it." You sighed and once again, Tony was silent for a moment. Then he went to the bathroom. "Steve, honey. You okay?" He had yet to say a word. He nodded and then turned from you. "Tried to kiss me this morning and Tony freaked, huh?" 
                          
                Before he could answer, Tony let out yet another earth shattering scream. "Now what?" You thought for a moment then felt your lips curl upwards into a smile. "What's the smile for, Y/N?" You did a mental countdown in your head and Tony emerged from the bathroom looking petrified. "What's wrong, dear cousin?" you asked sweetly knowing exactly what it was. "Seriously, Y/N! Why today? Of all days why did you have to start today?" You let out a laugh. "It's not like I can control it Tony, but you're going to have to deal with it. Oh, and by the way good luck with the cramps."
                          
                As if on cue, Tony suddenly doubled over. " Why do I feel like there are a thousand knives stabbing me all at once?!" You rolled your eyes. "Don't be such a drama queen. Go get a heating pad." Tony was about to answer when multiple phones started chiming. Text messages from Fury. A new mission in two days. You exchanged a glance with your cousin. How the hell were you supposed to go on a mission in each others' bodies?