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I'm not entirely sure specifically what 'black rule obeah scool stories' are. 'Obeah' is a form of folk magic in some Caribbean cultures. It could be stories related to some sort of rules within a context that involves black magic or obeah in a school setting, but without more context it's hard to say for sure.
There's no way to tell without more information. They could be completely fictional, made up to entertain or to teach a moral lesson. Or they could be based on real events that have been exaggerated over time. Maybe in some Caribbean schools where obeah has a presence in the local culture, there could be some real - life incidents that inspired these stories, but it's just as likely that they are pure fantasy.
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.
One possible fanfiction could be about Naruto characters attending the school in High School DxD. For example, Naruto's positive and determined attitude might clash with the more complex social and power dynamics in the DxD world. He could make new friends or even rivals among the devils, angels, and fallen angels.
One idea could be that Ben Tennyson somehow gets transferred to the world of High School DxD. He has to keep his alien forms a secret while dealing with the devils, angels, and fallen angels in the school. Maybe his Omnitrix could be misinterpreted as some kind of powerful devil device.
One possible fanfiction could be about Naruto characters somehow ending up in the world of High School DxD. Maybe Naruto's skills in combat and his determination would make him a formidable opponent in the battles that often occur in the High School DxD universe. He could form interesting alliances or rivalries with the characters there.