DxD: Dangerous Being

What if Sirzechs wasn't married to Grayfia? What if Sirzechs married someone more powerful? What if Rias looked up to this being as a true friend?

Meet Kurama, the most powerful being in every universe, they have the power to change genders, Kurama mostly stays in their male form, they are also married to Sirzechs since they choose to stay with the Gremory Family. Let's see what happens in this story.