She would likely become angry. Natasha is a strong character, and being betrayed would stir up her fury. She might start planning her revenge, using her skills and intelligence to get back at Percy. Maybe she'll try to expose his true motives to others in their world or group.
The relationship can develop through their shared anticipation of the baby. Steve can become more in tune with Natasha's emotions, and they can have deeper conversations about their future as a family. For example, they might talk about how they'll raise the child, whether they want a traditional or more unconventional upbringing.
To develop kid Natasha, you could focus on her backstory. Maybe she was an orphan and had to learn to fend for herself at a young age. This would make her resourceful and street - smart.
One aspect of Natasha x Wanda fanfiction could be the exploration of their unique relationship dynamics. In many fanfictions, their different personalities - Natasha's stoicism and Wanda's more emotional nature - are contrasted and combined in interesting ways. This can lead to stories full of tension and mutual understanding.
I really like 'natasha and wanda fanfiction' like 'Sisters in Arms'. In this story, Natasha and Wanda are paired up to take on a powerful enemy. Along the way, they share their past traumas and become closer, and it has some really interesting action scenes.
I'm not sure there are many official crossovers like this. However, one could imagine Naruto's ninja skills being quite a shock to the people of Wakanda. He might be intrigued by their advanced technology, while Natasha could find Naruto's chakra abilities very different from the superpowers she's used to in the Marvel universe. Maybe Naruto would learn from Wakanda's warriors and Natasha could learn some of Naruto's stealth techniques.
No. Fanfiction that involves sexual content is not appropriate as it goes against the ethical and moral standards. Such content objectifies the characters and is not in line with the positive and respectful portrayal that should be associated with fictional characters.
Fanfiction.net is also a good place to look. It has a large collection of fanfictions. Navigate to the Marvel section and then start looking for stories with the specific tags or keywords related to Steve, Natasha, and Bucky. However, the search function there might not be as advanced as AO3, so you might need to do a bit more digging.
In many of these fanfictions, Natasha's character is explored through her vulnerability when she's sick. For example, in some stories, we see her usual tough exterior crack, revealing her fear and dependence on her team mates, which is a side of her we don't often see in the movies.
She becomes more nurturing. In most of these fanfictions, Natasha, who is usually seen as a tough spy and fighter, softens up. For example, she starts to cook for Peter, something she might not have done before.