Naruto DxD: Testament of the Replaced

Naruto and Naruko were in love with their childhood friends Rias and Akeno, but they were smitten with another. Having enough, they moved on to tie up loose ends and seize their own destiny. The twins have become Kings, inheriting their own share of problems; but will fate bring them back together with Rias and Akeno? Naru/Harem, LOTS of multi-Xovers, Cover by Amenoosa