One possible plot twist could be that Sasuke initially rejects the idea of having a baby. He might be worried about his own goals and how a family would interfere. However, as time passes, he realizes his love for Fem Naruto and the baby and decides to embrace his new role.
Another plot twist could be related to the baby itself. What if the baby has some sort of special power or ability? It could be something that neither Naruto nor Sasuke expected. This could change the entire dynamic of the story, as they now have to not only protect the baby but also figure out how to deal with its unique powers.
Perhaps there could be a plot twist where an enemy discovers Fem Naruto's pregnancy and tries to use it against them. This could lead to a dangerous situation where Sasuke has to protect her at all costs, and they might have to go into hiding. The story could then focus on their struggle to keep the baby safe while still dealing with their personal issues.
One possible plot twist could be that the pregnancy is a result of some sort of experimental jutsu gone wrong. Maybe they were trying to develop a new power - related jutsu and it had unforeseen side effects on their bodies, leading to the pregnancy. This would add an element of mystery and danger to the story.
It could be that Fem Sasuke is under some sort of mind - control when she kidnaps Naruto. A powerful enemy, like Orochimaru or a new villain, might have used a jutsu to make her do this. As the story progresses, Naruto would then have to find a way to break the mind - control on Fem Sasuke while also dealing with the situation of being kidnapped.
A plot twist might be that there are forces trying to harm the baby because they fear its potential power. This could lead to Katara and Aang going on a dangerous journey to protect their unborn child. They might encounter new allies and enemies along the way, and it would test their relationship as they face these challenges together.
A great plot twist could be that the pregnancy is not as straightforward as it seems. There could be some sort of magic or curse involved that changes the nature of the baby as it develops. For example, the baby could start to show signs of being a different species than expected. Also, what if there are other characters who want to claim the baby as their own for power or some other ulterior motive? This could lead to a lot of conflict and drama in the fanfiction.
Sakura might be initially shocked and a bit jealous, but as a friend, she would probably come around and support them. She has grown as a character and would understand the importance of their relationship.
One possible plot twist could be that there is some sort of magic or jutsu involved that endangers the pregnancy. For example, a dark magic user might target Mirajane because of her unique powers and the fact that she is pregnant, seeing the unborn child as a potential threat in the future. Another twist could be that Naruto discovers a new form of chakra that can only be accessed through the combined efforts of him and Mirajane during her pregnancy, which then becomes crucial for saving their world from a great evil.
One idea could be that they have to face the challenges of being pregnant in a world full of shinobi battles. Maybe they have to hide their pregnancies from enemies who might see it as a weakness. Another could be that they support each other through the physical and emotional changes, and their friendship grows even deeper during this time.
One possible plot development could be the challenges they face as a couple. Sasuke, with his past and his often-solemn nature, might struggle with the idea of being a father. He could be worried about passing on his troubled history or not being able to protect his family. Sakura, on the other hand, would be determined to make their family work. She might use her medical skills to ensure a healthy pregnancy. And there could be external threats as well, like enemies from Sasuke's past coming after them because of the new addition to the family.
In the fanfiction, Tsunade might rescue baby Naruto from a dangerous experiment that was being carried out on him. As she rescues him, she realizes that Naruto has an extraordinary ability to resist the negative effects of the experiment. This leads her to believe that Naruto is destined for something great and she devotes herself to protecting him at all costs.
One possible plot twist could be that the kidnapper is actually related to Naruto in some way. Maybe a long - lost relative who has some sort of vendetta against the Hidden Leaf Village and thinks taking Naruto will give them leverage. Another could be that the kidnapper is being controlled by a greater evil force that wants to use Naruto's special powers for their own dark purposes. For example, they might want to extract the Nine - Tailed Fox's chakra from Naruto while he's still a baby and vulnerable.