A simple plotline could be that Tony Stark, being the genius he is, discovers a way to enter the wizarding world. He meets Harry Potter and they exchange knowledge. Tony shows Harry some of his high - tech gadgets like the Iron Man suit, and Harry shows Tony some basic spells. They then team up to fight a new threat that emerges in the wizarding world that requires both magic and technology to defeat.
Another plotline could involve a spell gone wrong by Harry Potter that transports him to Stark's world. He has no idea how to get back and Tony Stark takes him in. They start to work together. Harry helps Stark with some of his personal problems using his wisdom gained from his own experiences in the wizarding world. In return, Stark tries to find a way to send Harry back home using his technology. Along the way, they form an unlikely friendship.
One possible plotline could be that a powerful magical spell in the Harry Potter universe somehow crosses over and affects Tony Stark, causing the mpreg situation. Then, the story could revolve around Tony trying to figure out what happened and how to reverse it, with Harry Potter characters helping or hindering him. Another plotline might be that a new form of technology in Tony Stark's world has an unexpected side effect when combined with the magic of Harry Potter's world, leading to the mpreg. And the characters have to find a way to deal with the social and magical/technological implications.
A possible plotline is that Harry grows up in a world where magic and technology co - exist. He uses his combined heritage to solve mysteries that neither wizards nor superheroes could alone. For instance, he might use his knowledge of magic to fix a malfunctioning Stark tech device that has been enchanted. Or he could use Stark - made gadgets to enhance his magic in battles against dark wizards. His relationships with characters like Hermione and Thor would also be central to the story, as they help him understand his two sides.
One possible plotline could be that through some magical - technological mishap, Tony Stark ends up in the Harry Potter universe and somehow becomes pregnant. Maybe he has to deal with the magical world's reaction to this very un - magical situation while also trying to find a way back to his own world. Another could be that a spell or some new technology allows for a cross - universe connection that results in the mpreg situation, and then it's about how the two characters from different worlds navigate this new reality together.
One possible plotline could be a crossover in an alternate universe where Harry Potter's father, James Potter, and Tony Stark meet. Maybe they are brought together by some magical - technological mishap. Stark could be intrigued by the magic that James wields and they end up working together to solve a problem that threatens both the wizarding world and the world of technology.
Well, one way they could be related in fanfiction is through a multiverse concept. Maybe there's a rip in the fabric of different fictional universes and Harry Potter and Tony Stark end up in the same world. Harry could use his magic to help Tony with some tech - magic infused technology perhaps. It's a wild idea but that's the beauty of fanfiction.
One possible plotline could be that Tony Stark uses his genius to find an alternative way to defeat Thanos without sacrificing himself. Maybe he discovers a new element or technology during the final battle that turns the tide. Another plotline could involve time travel having unforeseen consequences that bring Tony back to life in a different timeline, and he has to find his way back to his original one.
One possible plotline could be that Tony Stark sees a future where his technology is misused and he has to find a way to prevent it. For example, he might see his Iron Man suits being used for evil purposes by a powerful villain. Another could be that he sees a future without him, and realizes the importance of training a successor, like Peter Parker, more seriously. Or he could see a future where the Avengers are disbanded due to internal conflicts, and he tries to mend the relationships in the present to avoid that future.
A plotline could involve Tony Stark joining Hydra to spy on them for the Avengers. He pretends to be on their side, but secretly feeds information back to his old team. Along the way, he has to be careful not to get caught and also has to deal with Hydra members who start to suspect him. This would create a lot of suspense and action in the fanfiction. Also, there could be a plot where Tony tries to change Hydra's ideology from within, using his charm and intelligence, but it turns out to be a much harder task than he thought.
One plotline could be that Hermione decides to start a new trend at Hogwarts by introducing muggle - style bikinis. She wants to break the traditional wizarding clothing norms and faces some resistance from the more conservative students and teachers at first, but eventually, it becomes a popular new style among the younger students.
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.