Azure Moon: Cerulean Tears

Ancient conspiraces and enemies, clashing ideology and allegiances, and the burning embers of a war long stoked by shadows was not the world they knew, but it was the world they had been drawn into, and forced to live in against their will. They stood shoulder to shoulder with the future king of Faerghus now, and would see it through to the end... The total end. (AM, B!Sibling AU)