What if Sally and Tony met in High School and stuck together as the youngest in school, as Tony was 10 and Sally was 12.
Sally had Perseus Anthony Jackson, his middle name in honor of Anthony Stark, his godfather, who had disappeared 8 months before Percy was born. It had been 10 months, and then, Sally opens the door to a knock and who was standing in the doorway? Godfather Stark.
Percy is now 19, having visited Tony over the school time, makibg sure that no one noticed at the persistence of Tony so that he 'wouldn't get hurt or kidnapped' by Tony's enemies. What would the Avengers think if they saw a boy, crying, running at Tony? How would they react if they found out that Tony had a godson?