One interesting betrayal story could be about a character who pretends to be a friend but secretly works against the main protagonist's goals in the High School DxD world on Wattpad. Maybe they steal important information or try to undermine their relationships with others.
One that stands out is a story where a character who is thought to be a weakling in the High School DxD setting on Wattpad turns out to be the one betraying the powerful group. This character has been secretly gathering information and building their own power base all along. They betray the group not for evil reasons, but because they believe the group's actions are leading them down a wrong path.
One possibility is that Naruto's powers are misconstrued in the High School DxD universe. His ability to use chakra and his ninja skills might be seen as something abnormal and scary. So, his new 'friends' in the DxD world could betray him out of fear or jealousy. They might think he's going to disrupt the balance between the different factions in their world, like the devils, angels, and fallen angels.
Well, 'After' is quite popular too. It tells the story of a girl who has a complex relationship with a guy in high school. There are love triangles, family issues, and the whole high school social scene is well - depicted, which makes it very relatable for many readers.
There are various mind control stories in High School DxD. One aspect could be the power dynamics among the characters. For example, some devils might use their powers to influence others' minds in battles or for strategic purposes. It adds an interesting layer to the complex relationships in the series.
One of my favorite mind control stories in High School DxD is when Issei has to face an enemy who tries to mind control his friends. It shows his determination to protect them.
In a Naruto and High School DxD fanfiction, there could be a scenario where the protagonists of both stories meet in a neutral dimension. Issei from High School DxD might be intrigued by Naruto's ninja skills and determination. Naruto, in turn, could be curious about Issei's Sacred Gear. They could start training together, sharing their knowledge and skills, and ultimately have to face a common enemy that threatens both their worlds.