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Once Upon A December by 7FeetUnder
Fandoms: Spider-Man - All Media Types, Spider-Man (Tom Holland Movies), The Avengers (Marvel Movies), Marvel Cinematic Universe
14 Aug 2026
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Summary
In December 1991, a "car accident" killed Tony's parents, wife, and son. But Bucky never actually killed the baby. When a reward goes out for the missing Pierre Stark, hundreds of fakes flood the interviews.
With his mom working herself to death after their move to New York, Harley decides he's not above scamming the billionaire who left him behind. The plan solidifies when he meets Peter Parker, who looks just like a Stark, and is such an idiot Harley might even convince him he is one.
Peter can’t be Tony’s son: Pierre would be twenty-five, not fifteen. But when Harley’s game of make-believe starts becoming real, Peter can’t help but wonder about the mysterious way Ben and May found him as a baby, on the ten-year anniversary of Pierre’s death.
OR
Peter is Tony’s long-lost son. Peter and Harley think it’s a joke until they realize they’re playing with fire. Peter doesn’t want to rip open Tony’s wounds in case he’s wrong, Harley doesn’t want to lose Peter to the billionaire, Tony is so unreachable that he might as well be in France, and Bucky will stop at nothing to find this missing kid and put him back in Tony’s arms.
OR
If Spider-Man (very loosely) followed the plot of Anastasia.