A popular fanfiction is 'Issei and Rias: United Front'. It portrays them as a powerful duo against their enemies. The author does an amazing job of writing their interactions, making it seem very natural. The story also has some great plot twists that keep readers engaged. You can find these fanfictions on various fanfiction websites. Just search for 'Highschool DxD Issei x Rias fanfiction' and you'll get a whole list to choose from.
There's a fanfiction where Naruto has godlike powers and teams up with Rias in Highschool DxD. It shows how Naruto's power and his different mindset from the DxD characters can create some really cool and unexpected storylines. For example, his way of handling the devils and other supernatural beings is quite different, which makes for an exciting read.
In 'godlike naruto x rias highschool dxd fanfiction', an exciting plot point is often Naruto's journey to adapt to the new world of Highschool DxD while still maintaining his own identity and powers. His godlike status might attract various factions, both friendly and hostile. Rias might be drawn to him because of his power and his pure heart. The fanfictions may also explore how Naruto uses his sage mode or other advanced techniques in the context of the DxD world, and how that impacts the existing power structure and politics within the devil and other supernatural groups.
He might react with hostility. Dark Naruto has a certain edge to him, and if he sees Rias as a threat or someone he doesn't like, he'll likely oppose her. He could use his combat skills to challenge her directly.
There's a fanfic called 'Rias and Issei: A New Adventure'. In this one, they go on a journey together that tests their relationship. The author does a wonderful job of portraying their feelings for each other and the challenges they face as a couple in the world of Highschool DxD.
Another common theme is the exploration of the different arcs from the series but with a focus on Issei and Rias. This could include their adventures in the Underworld, dealing with rival devil groups, or facing new threats together. Fanfictions may expand on these storylines while highlighting their relationship.
One great fanfiction in this category is 'A New Bond'. It delves into the relationship between an original character and Rias in a really interesting way. The story develops their connection gradually, starting from a chance encounter and evolving into a deep emotional bond. The author does a wonderful job of fitting the OC into the Highschool DxD universe, making it feel like they were always meant to be there.
The appeal lies in the potential for new and unique storylines. Since the OC is a creation of the author, it can bring fresh perspectives to the Highschool DxD world. For example, the OC could have abilities or a personality that no existing character has, which can lead to interesting interactions with Rias.
In fanfiction, such a betrayal could occur due to power struggles. Maybe Rias sees Naruto as a threat to her position in the Highschool DxD world. She might fear his growing power and influence, which could overshadow her own. So, in order to maintain her status, she betrays him.
One great fanfiction idea could be that Issei discovers a new power within himself that is directly linked to Rias's heritage. Maybe he can tap into an ancient magic that only works in harmony with Rias's own powers. As they train together to master this new ability, their relationship deepens beyond just the typical master - servant bond in the Highschool DxD world.