Tony Stark has a daughter, unbeknownst to him. He and Pepper get a letter saying that she would like to meet him. Of course, Tony's unsure. But when he's taken hostage, she takes over. Will they forge a father/daughter relationship? And how does he feel about her being eyed by the star-spangled capcicle himself?
Starts briefly before Iron Man, then goes through Avengers. Steve/OFC a little later on.