Another interesting one is 'Redemption and Friendship'. In this story, Nebula helps Tony deal with his post - Thanos trauma. Tony, in turn, tries to understand Nebula's past and her complex relationship with her sister. Their interactions are filled with emotional depth and mutual respect.
In a fanfiction, perhaps Nebula saves Tony Stark's life during a space battle. Tony, being the brilliant mind he is, then decides to create a new weapon or technology with Nebula's help. They bond over their shared experiences of survival and their determination to protect the universe. Their relationship could grow from mutual respect to a deep friendship as they face various challenges.
In certain fanfictions, Nebula and Tony Stark may form a friendship based on their shared experiences of loss. They both have lost a great deal - Tony his friends and family in the various battles on Earth, and Nebula her own family to Thanos. This common ground could lead to a deep bond where they support each other. For instance, Nebula could help Tony in his technological pursuits related to space exploration, while Tony could assist Nebula in adapting to life among the Avengers or other Earth - based heroes.
One common theme is survival. Given their experiences in space and facing tough situations, many fanfictions focus on how they rely on each other to stay alive.
Well, Nebula herself is likely to be one of the main characters interacting with him. They might have some interesting conversations about the technology they both use or their experiences in space.
Nebula can play the role of a catalyst. Her presence can push Tony to expand his thinking beyond Earth - bound problems. For example, if there's a story about Tony developing new space - friendly technology, Nebula's knowledge of different alien cultures and technology could be the trigger that sets him on that path.
The plot could involve Tony and Nebula going on an adventure to find a powerful energy source that was lost during the events of the Infinity War. Along the way, they encounter various alien species that try to stop them. Tony uses his quick thinking and Nebula her combat skills to fight through. In the end, they find the energy source and use it to power a new device that can protect Earth from future threats.
Another plot could involve the reaction of the other Avengers. They might be initially confused or even a bit worried about Tony's new look and abilities. But as he starts using them to their advantage, they come to accept and even rely on this new version of Tony Stark.
One great tony and nebula fanfiction is 'A New Bond'. It focuses on their relationship after they return to Earth. It shows how they support each other in rebuilding and how their friendship deepens.
I really like 'The Meeting of Iron and Green'. It starts with a rather unexpected encounter between Tony Stark and Gamora. As the story progresses, it delves deep into how they might influence each other's views on life and heroism. It's not just about action but also about the growth of their characters within the story.
I'm not really into that specific type of fanfiction, but you can try looking on fanfiction.net or Archive of Our Own. They have a wide variety of fanfictions and you might be able to find some tony stark mpreg ones there.