Natasha could also be disappointed but determined. She might see this as a setback but use it as motivation to prove herself elsewhere. For example, she could go and work for one of Tony's competitors and become very successful there, just to show Tony what he missed out on. She could also try to improve her skills or image to make herself more appealing in the future.
Another possibility is that Natasha is indifferent. She might not really care that much about the job with Tony. Maybe she had other options in mind all along and was just testing the waters with Tony. So when he doesn't hire her, she simply moves on to her next plan without much of a fuss.
Perhaps it causes a rift in the superhero community. Some might side with Tony's decision, while others might see it as a mistake. This could create tension and different factions within the community, leading to various sub - plots and conflicts.
One possible reason could be that Tony has some pre - existing biases. Maybe he has a set idea of the type of person he wants on his team and Natasha doesn't fit that mold in his mind. For example, if he's looking for someone with a more technical background and Natasha's skills seem more combat - oriented to him at first glance.
It could be that Tony Stark already has a full team with specific skill sets that he believes don't need Natasha's skills at the moment. He might be focused on tech - based heroes or those with superpowers that are more in line with his current projects.
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.
Natasha may come to view Tony as a kindred spirit. If she discovers that he also has a longing for real connection like she does, she'll feel a sense of kinship. His true nature might show that he is not as different from her as she initially thought. They could then develop a closer friendship or even something more, as they realize they share common emotional ground beneath their outward appearances.
Peter could also be a bit annoyed if it's not a good time. For example, if he was really focused on a test or a lesson he was interested in. But still, he'd probably answer because he knows Natasha wouldn't call without a good reason. He might give her a look that says 'this better be important' while trying to listen to what she has to say.
Natasha would likely be cautious at first. She has seen a lot in her life and new powers can be dangerous. But she would also be curious and protective.
Another theme is teamwork. They are both part of the Avengers, so many fanfictions focus on how they work together on missions, whether it's fighting a new villain or rescuing hostages. Their different skills - Tony's technology and Natasha's espionage abilities - make for interesting team - up scenarios.
She might try to manipulate Loki. Natasha is very good at getting into people's heads. She could play on Loki's ego or his own insecurities to gain an advantage. For example, she could pretend to be interested in his plans or offer to help him in some way, all while secretly planning her escape.
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.