It's a Secret to Everybody

Peter gets to spend all summer living in Avengers Tower with Tony. When the Rogue Avengers get pardoned and come back to live at the Tower too, they're confused as to who Peter is. However, once they see how Tony acts around Peter, that confusion goes away, as they know for certain who Peter must be - Tony's secret son.

Tony and Peter decide to make the most of the situation, and play along. They hope they can keep up the act all summer. But they soon learn that they barely have to act at all.