What could be the plot of 'Naruto returns to Rias' fanfiction?

Well, one possible plot could be that Naruto, as the son of Rias, discovers his unique heritage and has to deal with the expectations that come with it. He might struggle to balance his ninja skills with the devil - like powers he inherits from Rias. Maybe he uses his Naruto - like determination to bridge the gap between the ninja world and the world of devils.

Perhaps in this fanfiction, Naruto has lost his way in his own world and somehow ends up in Rias' realm. Rias, being kind - hearted, adopts him. Naruto would have to adapt to a whole new set of rules and powers. He might face challenges from other groups who are suspicious of this new addition, but with his ninja spirit, he overcomes them.

One possible plot could be that Naruto, as Rias's brother, brings his ninja skills to the world of High School DxD. He might use his jutsu to protect Rias and her peerage from various threats, like the devils from other factions or rogue exorcists. And along the way, he could also teach some of his ninja techniques to the members of Rias's peerage.

Well, it could start with Naruto somehow ending up in the world of High School DxD. Rias might discover Naruto and see his potential, then make him her familiar. The plot could involve Naruto learning about the devil society and using his ninja skills to protect Rias and her peerage.

One possible plot could be that Naruto and Rias, through some magical or unexpected circumstances, find themselves in a relationship. Their pregnancy could then bring about various challenges. For example, they might face opposition from their respective worlds. Naruto's world of ninjas might not understand his relationship with Rias from a different realm, and vice versa. Their friends and allies would have different reactions, some being supportive while others being skeptical. They would also have to deal with the practical aspects of preparing for a baby, like finding a safe place to live and ensuring the child's future in two very different and complex worlds.

In such a fanfiction, perhaps Naruto is in a new world where Rias, for some reason, completely ignores him. Maybe it could lead to Naruto feeling isolated and having to find his own way in this strange new place. He might start training alone and discover new powers out of his need to prove himself despite Rias's neglect.

The plot could involve Naruto using his knowledge of chakra to diagnose Rias' brother's illness. He might discover that it's not a normal sickness but something related to the supernatural nature of their world. For example, his chakra flow could be disrupted by a dark magic spell.

The devils that oppose Rias' group could be the antagonists. They might see Naruto as an unknown threat and try to eliminate him. Also, there could be some dark magic users who don't want Naruto interfering in their plans in Rias' world.

In this fanfiction, perhaps Naruto's strong sense of protection kicks in. Since he is used to protecting his village, he now focuses on protecting Rias and their unborn child. He might use his ninja skills to ensure their safety while Rias uses her devil powers to support them in other ways, like gathering resources or information. And the story could revolve around their journey of preparing for the new life together.

Well, perhaps the plot could center around Naruto's cousin being sent to Rias' world on a mission of sorts. Maybe there's a disturbance in the balance of power in Rias' realm that has an impact on Naruto's world too. The cousin, with his knowledge of Naruto's adventures, uses some of those learned tactics in the new world. He and Rias could form an unlikely alliance and as they get to know each other better, they start to share their respective cultures and powers, leading to a stronger bond between them and their teams.