The Royal We

Fresh from surviving the coup that took the lives of their parents, Akiridion Royals Aja and Krel Tarron need a place to lay low, and SWORD believes that can be Arcadia, under Ben 10's protection. Ben's pretty sure he can handle it, after taking down Vilgax, but the heirs to the Akiridion throne might draw in their own trouble... (a sequel to Changing of the Guard, multicrossover)