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.
In the 'Tony Stark Sees the Future fanfiction', perhaps he sees a future with a global catastrophe that is caused by a new form of energy he was about to develop. So he has to either halt the project or find a way to make it safe. He might also see a future where his friends and family are in danger because of his actions. So he starts to reevaluate his decisions and make amends. Maybe he sees a future where Earth is invaded by an alien race that his current defenses can't handle, and he then focuses on improving the planet's security.
It could be a future version of himself that has become corrupted by power. He sees this future self causing chaos and destruction, and has to find a way to stop his own dark path. Maybe it's a result of his technology getting out of control and warping his mind.
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.
Perhaps there's a power struggle over a new technology or a powerful artifact. Tony wants to use it for what he believes is the greater good, but Steve opposes him. Their clash escalates to a point where Tony, in a fit of rage or desperation, kills Steve. Or maybe it's a situation where Steve discovers some dark secret about Tony's business dealings and Tony kills him to keep it quiet.
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 could be them having to keep their marriage a secret from the world. Maybe because of Tony's business rivals or Natasha's undercover work. They would have to navigate their relationship while hiding it from everyone, which could lead to some really tense and exciting moments.
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 discovers a new technology that allows him to have wings. He could use these wings to enhance his superhero capabilities, like flying faster and more stealthily than with his regular Iron Man suit. Maybe he uses the wings to access hard - to - reach places during a rescue mission or to surprise his enemies from above.
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.
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.
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.