Fics like Magic and Iron

After the war, many thought Rosemary Potter would become an Auror, including herself, but on the first day of training, two months after the war, she quit within ten minutes. Instead, she used her inheritance from the Potters and Blacks and some business lessons from the Goblins to buy and invest in businesses in the Muggle World, Sirius would never have approved of her using the money for anything but something that his family would have hated. Her work gets noticed by the Muggle World, and soon she's famous and that gets Tony Stark interested.

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