One idea could be that it's a magical or scientific accident that causes them to be in this situation. They might struggle with how society views their condition, especially in the superhero world where such a thing is unheard of. They could also have to deal with the physical and emotional changes that come with pregnancy, like mood swings and cravings.
One idea could be that they initially struggle with the news. Tony might be over - the - moon but also worried about the dangers of their job affecting the pregnancy. Ziva could be more reserved, fearing how it will change her life as a once - tough agent. Another plot could involve their team members' reactions. Gibbs might be secretly happy but also strict about safety protocols at work. Abby would be all excited and start knitting baby clothes right away.
One idea could be that they face challenges in their relationship due to the pregnancy. For example, Tony might be overly protective while Ziva wants to maintain her independence. Another could be that they have to deal with work - related issues while preparing for the baby. Maybe their team has to cover for them during important missions.
A great plot could be that Pepper's pregnancy makes Tony re - evaluate his own life and his role as Iron Man. He might start to think about the future more and worry about how his dangerous lifestyle will affect his child. So he decides to take a step back from some of the more dangerous Avengers missions. Meanwhile, Pepper is dealing with her own fears and excitement about becoming a mother, and they support each other through this new chapter of their lives.
One plot idea could be that they discover their 'brotherhood' through some magical or scientific accident. Maybe they have to team up to stop a common enemy, like an ancient, powerful being. They could start off hating each other because of their different personalities (Tony's brashness vs Loki's slyness), but as they face challenges together, they learn to respect and care for each other.
One idea could be the exploration of how Loki and Sigyn prepare for the baby's arrival. Maybe Loki is initially worried about being a good father due to his complex past. Another plot could involve Sigyn having some sort of premonition about the baby's special powers, which adds an element of mystery. Or perhaps there are external forces that try to harm Sigyn during her pregnancy because of the baby's significance in the Asgardian realm.
Well, perhaps the fanfiction could focus on Loki dealing with the pregnancy in a world that is not very accepting of such a situation for him. He could face discrimination or strange looks, and the story could be about him rising above that and finding strength in his new state. He might also have to deal with the mystery of how he became pregnant in the first place, if it's not a normal occurrence in that fictional world.
Another plot could be that Bella Swan has a strange dream about Loki and then discovers she's pregnant. She's confused as she doesn't know how it's possible. Loki, in the meantime, senses a connection to her from afar. He travels to her world to find out more. As they meet, they realize that there's a greater force at work that has brought them together and they must figure out how to deal with the pregnancy and the implications it has for both their worlds.
One idea could be exploring how Yennefer deals with the physical and emotional changes during pregnancy while still being a powerful sorceress. Maybe she has to find a way to protect her unborn child from the many enemies she has made.
One idea could be exploring how she and her partner (like Percy) adjust to the news. They might have to deal with the reactions of their friends and family. Another could be the challenges she faces during the pregnancy, like her still wanting to be involved in heroic adventures but having to be more cautious.
One idea could be exploring how Gwen's friends and family react to the news. Some might be overjoyed while others could be worried. Another plot could involve Gwen dealing with the physical and emotional changes during pregnancy while also trying to maintain her normal life, like her hobbies or job. And a third could be about the father's role, if known, and how their relationship evolves during this time.