One possible plot could be that Tony and Natasha reunite in heaven. They might look back on their time on Earth, the battles they fought together. They could share their regrets, like Natasha might regret not being able to do more for the world before her sacrifice, and Tony might regret some of the decisions he made during the various conflicts. They then start to explore heaven together, meeting old friends who also passed away and reminiscing about their shared memories.
In this fanfiction, perhaps Tony and Natasha find that heaven has given them new powers or abilities. They use these to protect the souls in heaven from some kind of threat. Maybe there's a dark force trying to disrupt the peace in heaven. They form a team with other deceased Avengers and use their combined skills and the new powers they've been granted to fight off this threat and ensure the safety of heaven.
Maybe an old enemy from their time on Earth who somehow managed to get into heaven. This enemy could hold a grudge against both of them and wants to take revenge. They might use their knowledge of Tony and Natasha's past weaknesses to try and defeat them in heaven, where the rules are different from Earth.
One possible plot twist could be Natasha taking on Tony's role as the tech - savvy billionaire. She might use her combat skills and spy training in a new way to handle Stark Industries. For example, she could turn the company's focus more towards creating defensive technologies for the world's most vulnerable areas. Another twist could be Tony in Natasha's role. He'd have to rely more on his wits and physical abilities rather than his high - tech gadgets. He might struggle at first but then find new ways to outsmart his enemies using his intelligence in a more hands - on way.
Well, it could be that Natasha learns about Tony's true nature in terms of his self - sacrifice. Tony often acts like a self - centered billionaire, but in reality, he is willing to put everything on the line for the greater good. Natasha might come to see this when they are in a tough situation together, like facing a powerful enemy where Tony's first thought is about saving the world rather than his own interests.
One possible reason could be that Tony has some pre - existing biases. Maybe he has a set idea of the type of person he wants on his team and Natasha doesn't fit that mold in his mind. For example, if he's looking for someone with a more technical background and Natasha's skills seem more combat - oriented to him at first glance.
Well, one possible plot could be that they discover they are siblings in a dramatic moment during a big battle. Then they have to figure out how to work together as family while still dealing with the threats against the world.
It could be a new villain that we haven't seen in the original Marvel universe. This villain might be able to manipulate Natasha's emotions and loyalty, making her betray Tony. For example, a powerful sorcerer who uses dark magic to control her.
Another theme is teamwork. They are both part of the Avengers, so many fanfictions focus on how they work together on missions, whether it's fighting a new villain or rescuing hostages. Their different skills - Tony's technology and Natasha's espionage abilities - make for interesting team - up scenarios.
One possible plot point could be Natasha's stealthy approach to the Siberian location where Tony is in trouble. Maybe she has to evade guards or overcome various obstacles to reach him in time.
One common theme is the blending of their two very different personalities. Tony is often portrayed as more flamboyant and tech - savvy, while Natasha is more reserved and stealthy. Their marriage forces them to find common ground and understand each other better.
One common theme is the fear of the unknown. Since they are both superheroes, they're not used to dealing with normal life events like pregnancy. Another theme is the support they give each other. For example, Tony might use his resources to ensure Natasha has the best medical care during pregnancy.