Old Family New Powers

Percy was just having one of those days, the kind when nothing seems to go your way when he comes across a guy who he thinks is a perfect target for pickpocketing. He ends up having more money than he ever could have dreamed of finding.

Tony Stark was coming out of a restaurant after catching up with an old friend when he receives a text on his phone from Pepper telling him that Furry has called a meeting and that he better not be late. Completely absorbed in his phone, he doesn't notice a boy take something out of his pocket and make off with his wallet.
Flash forward to Persassy meeting the Egotistical Billionaire and things get interesting.

Arthur (Percy Jackson) is the biological child of Steve Rogers and Peggy Carter. After Arthur was born Peggy and Steve took care of him for a few months, then Steve crashed into the ocean and froze. Although Peggy loved Arthur, she couldn't take care of him any longer and it was hard for her to have him as a constant reminder of who she had lost. Arthur was supposed to be given to a married and retired SHIELD employee to raise him, but because he inherited Steves Super Soldier Serum he was taken by Daniel Whitehall, who was pretending to be a SHIELD employee.

Hestia had taken a liking to Peggy's family and decided to watch over Arthur when he was born. When she found out Whitehall's true character she informed Poseidon and he took care of him and kept him frozen in time as an infant. Poseidon was looking for the right time to give Arthur to a "normal" family, so when Sally gave birth to Percy Jackson, Poseidon merged Arthur with Percy and they became Percy Jackson Son of Poseidon and Steve Rogers and Blessed by Hestia.

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Disclaimer for the entire book.
I do not own any of the Marvel or Percy Jackson characters, those belong to Marvel and Rick Riordan respectfully. The plot and other original characters are entirely my own.