Fics like The Stark Siblings

"Excuse me?" Tony questioned, dumbfounded, as he stared at his mother, wondering if he had heard wrong. "I'm pregnant tony." Maria repeated softly. "You're going to be a big brother." She smiled at him as she spoke and tony thought his mind might explode. Pregnant?! A big brother?! This was insane, he was not ready to be a brother! Surely this was some kind of prank. He tried to dismiss the fact that pranks were very much not his parents' type of thing. or I started watching Iron Man: Armored Adventures and it led to this. What if instead of the typical father-son relationship, Tony and Peter were siblings? They have an 18-year age gap and tony is still in college when peter is born.

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