One possible fanfiction could be about Rias and Sona teaming up for a school event. They might put aside their usual competitiveness and work together to organize a devil - related festival at the school. They could combine their unique skills and powers to create an amazing event that not only impresses the other students but also strengthens their bond as friends.
Well, it depends on what you consider 'good'. There are many different takes on the highschool dxd rias femdom concept in fanfiction. Some might focus more on the power dynamics, while others could be more about the relationship development. Try exploring different fanfic communities and asking for recommendations.
A fanfiction could show how Rias and Sona first became friends. Maybe it was during a difficult time at school when they both had to face some sort of discrimination from other devils because of their different leadership styles. They found comfort in each other and decided to support one another from that moment on.
One possible idea for this fanfiction could be Naruto being transported to the world of High School DxD. He might end up attending the same school as Rias. Given Naruto's strong sense of justice and his combat skills, he could quickly become involved in the supernatural battles and power struggles in that world. He might also form an interesting relationship with Rias, perhaps starting as friends and gradually developing into something more as they face various challenges together.
Themes like love and friendship are quite common. Their relationship can be seen as a blend of both. There's also the theme of self - discovery. Issei, for example, discovers more about his powers and his place in the supernatural world. Rias also has her own journey of self - realization. Additionally, the theme of protecting what they cherish, like their friends and the world they live in, is often explored in these fanfictions.
A Rias and Issei wedding fanfiction could be full of grandeur. There would be various characters from the Highschool DxD universe in attendance. The wedding might take place in a magnificent location, perhaps a grand cathedral-like place in the Underworld. Rias would look stunning in a traditional yet unique wedding dress, and Issei would be in a sharp suit. Their friends would give heartwarming speeches, and there would be a sense of celebration not just for the couple but for the unity of different factions in the story.
The main thing is the new relationships. When an OC is paired with Rias, it creates fresh dynamics. We can see different sides of Rias's character through her interactions with an unknown element like the OC.
Naruto would likely become very distrustful. After being betrayed by Rias, he would find it hard to trust anyone else in the Highschool DxD world. This could isolate him and make his journey much more difficult as he would be on his own without allies.
In some fanfiction scenarios, Rias might be involved in a political intrigue within the 'Highschool DxD' world that Issei doesn't understand or approve of. Her actions during these events, such as making alliances with characters Issei distrusts, could lead to his dislike. Also, if she were to accidentally expose Issei to danger due to her own miscalculations in these political games, that would surely sour their relationship.