Fics like DxD: Devil Dragon Emperor

At 7 years old, a rogue devil killed his father and forced Issei to awaken his Boosted Gear. That was witnessed by Venelana Gremory, who had come to deal with the devil herself. In the end she took the boy and his mother into her family, and he became her daughter's pawn. Ten years later, Issei had grown to become one of most powerful reincarnated devils, with an evergrowing harem and evergrowing power.

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