You’re basically a daughter to Tony. He and the avengers found you in a hydra base when you were 11 and (They didn’t want to but Nick wanted them to) the avengers trained you to join their ranks, they wanted a normal life for you, but you never liked normal anyways. Tony loved you as if you were his own child. Three months ago you went on what should’ve been a simple mission on your own. Suddenly your comms went dark, after three weeks they declared you MIA after sending fleets of helicopters looking for you, after two months. They declared you presumed dead. All the avengers mourned horribly, but no one worse than Tony. He just shut down. The sarcastic playboy of the team was gone. He became a shell of himself, threw himself into Ironman and work alone. Lost weight, stopped sleeping, stopped eating, it didn’t matter how much Steve or Peter begged, nothing seemed worth trying to stay alive for. It scared all of the avengers because they did really care about Tony and knew how much he loved you, and they were scared they were watching him die too.