The meeting would be a clash of two very different worlds. Harry, with his humble Hogwarts robes, would stand out in Tony's high - tech environment. Tony, on the other hand, in his sleek Iron Man suit, would seem like a strange being to Harry. But as they start to interact, they would find common ground. Harry's sense of justice and his willingness to fight for the good would resonate with Tony. And Tony's intelligence and resourcefulness would be something Harry could admire. They would start to trust each other and collaborate to face the threats that brought them together in the first place.
At the start, Tony could be a bit skeptical of Harry's abilities. But when Harry shows off a spell, like making a Patronus, Tony would be impressed. They would then start to work together. Harry could use his magic to help Tony get into places that are otherwise inaccessible, and Tony could provide Harry with some cool gadgets. For example, Tony could give Harry a device that helps him communicate with the wizarding world more easily. They would learn from each other and form an unlikely friendship.