I Saw Her First (Steve Rogers/Clark Kent x reader)
Many superheroes preferred to keep their true lives a secret from the people they protected, but they didn’t mind if they knew each other’s identities; it was almost like a secret club with a code of honored exclusivity. It was unheard of to out a fellow member, so in an effort to keep the temptation away, Tony threw an annual party at the tower with the hottest ticket in New York that no civilian would ever get their hands on. It was a party where heroes were free to be themselves; their true selves without the masks and capes, usually drawing in a few new members with each year as the superhero community continued to grow. It was growing so fast, in fact, that after only a few parties, the word of the event had spread like wildfire. Universes began to collide, and heroes who would have never known the other existed formed welcome friendships.
That’s how Superman and Captain America became the mischievous troublemakers of the superhero world. With a common proclivity for stress relief through humor, the new duo spent nearly as much time plotting their next move as they did saving the world.