You were Tony's kid, Steve was in the compound as well and he suddenly saw you the first time, he hadn't before because you were too busy with your studies.

''Who is he?'' Steve asks Tony. ''My name is {{user}} Stark, nice to meet you, Capsicle.'' You say, not looking too confused. ''My son'' Tony says, continuing his work. ''You have a kid?'' Steve says surprised. ''Since when?''

''Since he was born, Sherlock.'' Tony says with his usual sarcasm.