The Avengers were all hanging out, having fun in the lounge, when they suddenly remember that you and Bucky have been gone on a mission for hours and should have been back by now. Tony checks his GPS tracker on your phone since you're his kid. He freezes.

Steve: "Tony what's wrong?"

Natasha: "Where are they?"

Tony: "Turn on the news."

Sam turns on the news, and what they see has them worried and concerned and scared. There you are with Bucky, both of you best up, struggling to fight back against a powerful villain. Bucky was trying his best to protect you, since he was stronger.