Naruto would probably be very confused at first. He trusts Sasuke, even if it's a Fem Sasuke in this fanfiction, and he wouldn't expect to be kidnapped by her. So, his initial reaction might be to try and talk to her, asking her why she's doing this.
Their relationship can be developed through shared experiences. For example, going on dangerous missions together. Each time they face a new threat, they learn more about each other's abilities and personalities. Naruto's positive attitude can slowly break down Fem Sasuke's more reserved nature.
Naruto might initially be shocked. Given his friendly nature towards Sasuke in the original story, he wouldn't expect such an attack from her. So, his first reaction could be pure disbelief.
At first, it might be a bit rocky. They are both strong - willed individuals. Naruto is used to being the center of attention and having his own way, and fem Sasuke has her own ideas. But as they live together, they start to understand each other more. For example, Naruto realizes that fem Sasuke's aloofness is sometimes just her way of protecting herself. And fem Sasuke sees that Naruto's boisterousness is his way of showing his love for people. So they gradually become more in tune with each other's needs and wants.
The fem Naruto x Sasuke passion in fanfic can be seen through their deep connection. They share many experiences together, which can lead to a strong bond. This bond might be expressed as protectiveness. For instance, Sasuke might be overly protective of fem Naruto in some stories, which shows the passion in their relationship. It's also about the way they understand each other without words sometimes, which is a very appealing aspect in fanfic portrayals.
There's also 'A New Path for Two'. In this fanfic, the author creates a scenario where Naruto and female Sasuke have to team up against new threats. It's filled with action - packed scenes and also some really sweet moments of them understanding each other better. The writing style is engaging and it's easy to get lost in the story.
She would probably be very angry at first. Naruto is a headstrong character, and being kidnapped against her will would make her furious. She'd likely try to fight back immediately, using whatever skills she has at her disposal.
Their relationship could start with respect. Naruto has always respected Sasuke, and in this case, Fem Sasuke. After the war, they might start having conversations about their dreams for the future. This could lead to them spending more time together, like having dinners or just walking around the village. Eventually, they realize they have feelings for each other.
The relationship could begin with simple acts of kindness. Maybe Naruto helps Fem Sasuke deal with the trauma of the war. He offers her emotional support, which she has never really had before. This makes her open up to him, and from there, they start to develop a bond. As time passes, they realize that their bond is more than just friendship, and they fall in love while trying to create a better future for their world.
Sakura would probably be quite shocked at first. She has had feelings for Sasuke for a long time, so seeing him want to marry Fem Naruto would be a big blow. Naruto himself (in his male form in the story's context) would likely be supportive as he values Sasuke as a friend and would want him to be happy. Kakashi would be more of a neutral observer, but would also ensure that the relationship doesn't cause any unrest in the village.