My Dad the Genius, Billionaire, Playboy

This is a My Son the Wizard AU. Petunia discovers her sister's journal revealing Harry's true parentage years earlier than in My Son the Wizard. A much more reckless and irresponsible Tony Stark now has custody of his five-year-old magical son. Will he decide to raise him or will it prove too much responsibility for the playboy?Will he turn into the type of father he always feared?