Highschool DxD: Fanfic about Sirzechs and Rias

Another idea for the fanfic could be a prequel of sorts. It could show their childhood and how their bond was formed. Maybe there were early challenges they had to face together, like dealing with the expectations of their noble devil families. This could also delve into their training as young devils and how they influenced each other's growth and personalities.

One possible fanfic could be about their relationship as siblings in the context of the Highschool DxD universe. Maybe it could explore how Sirzechs' actions and decisions affect Rias. For example, his leadership in the Underworld might have an impact on Rias' development as a devil and her role in the school's Occult Research Club. It could also show how they support each other during difficult times, like when facing threats from other devil factions or powerful enemies.

A fanfic could focus on a particular adventure where Sirzechs and Rias team up. They might have to solve a mystery in the Underworld that has the potential to disrupt the balance between the three factions (devils, angels, and fallen angels). This would give the author a chance to show their individual powers and how they work together. Rias' intelligence and Sirzechs' strength could be combined to overcome various obstacles.