Perhaps Naruto is enslaved in a way that limits his chakra use. He then has to rely on his physical combat skills and strategic thinking, which are also highly developed. This could lead to some interesting battles within the Rias Peerage as some members might underestimate him. And in the end, he could break free from the enslavement by finding a loophole in the magic or power that binds him.
One possible plot development could be Naruto initially fighting against the enslavement. He might use his ninja skills and chakra to resist the control of Rias Peerage. However, as the story progresses, he could start to understand their motives and form an unlikely alliance. For example, they might be trying to protect a greater good that Naruto didn't initially see.
In this fanfiction scenario, Naruto's unique abilities like his shadow clones and rasengan would be interesting to see in the context of being kidnapped by Rias Peerage. Maybe the Peerage kidnapped him because they saw his power and wanted to use it for their own purposes. Naruto might resist and start training in secret to get stronger and break free. He could also form an alliance with other characters who oppose Rias Peerage in their world.
Naruto may be forced to fight in battles or do tasks that he doesn't want to do. His skills and powers could be misused by Rias for her own purposes. Also, his relationships with his friends in his own world might be affected as he is enslaved in another world. He may not be able to return to his home or communicate with his friends, which could cause a lot of emotional distress for him.
One interesting plot development could be Naruto's unique fighting style integrating with the peerage's combat strategies. His shadow clone jutsu, for example, could be used in new and creative ways during battles against other supernatural groups. It might also lead to some comical moments as Naruto tries to adjust to the more formal and sometimes strict rules within Rias' peerage.
Naruto would likely be very angry at first. He is a free - spirited person who values his freedom greatly. So being enslaved would go against everything he stands for. He'd probably try to break free immediately, using his brute strength and any ninja techniques he can muster.
It could also be due to a power struggle. Naruto is extremely powerful and independent. If Rias or other members of the peerage try to control or limit his power in some way, he would not tolerate it. His power is a part of who he is, and he's used to using it freely to protect others. So this could lead to his departure from the peerage.
In a Naruto - Rias' peerage fanfiction, the story might focus on how Naruto's chakra system interacts with the devil's power. For example, his ability to sense chakra could be enhanced or changed when combined with devilish senses. Also, his relationship with the members of the peerage would be interesting. He could form strong bonds with some, like Kiba in Naruto's world, he might get along well with the werewolf in Rias' peerage.
The plot could also explore how Naruto's identity as Nagato's son affects the Akatsuki. Maybe some members of the Akatsuki would try to recruit him or use him for their own purposes. On the other hand, Naruto might try to reform the Akatsuki from within. His connection to Nagato could also lead to a different resolution of the conflict between the ninja villages. Instead of just uniting the villages as in the original story, he could aim to create a more global peace based on Nagato's broader view of the world, which was not just limited to the ninja villages.
Naruto in Rias' peerage would be quite a sight. His orange jumpsuit would stand out among the devils. He might use his shadow clones to do multiple tasks within the peerage, like scouting or helping with household chores. His positive attitude would also have an impact on the often - serious devils in the peerage.
In a fanfiction with godlike Naruto in Rias' peerage, Naruto would likely be a dominant force. His godlike status might mean he has even more enhanced versions of his usual powers. He could potentially teach the other members of the peerage some of his ninja ways, like stealth and quick movement. And in battles, he could turn the tide easily with his overwhelming strength.
One possible plot development could be that his friends, like Sakura and Sasuke, come to take care of him. Sakura uses her medical skills to try and bring down his fever. Another could be Naruto having fever-induced dreams about his past, like his lonely days as a child. Maybe he even hallucinates about his parents. It could also lead to a situation where the village is in danger, but Naruto is too sick to help at first, creating a sense of tension and urgency among the other characters.