Your blood is my bond (Villain Deku Au)

A Villain Deku au, where All Might told Izuku that he could never be a hero, and he was right, Izuku never will be a hero. But here's the twist Izuku was born with a quirk and a devastating one at that. His quirk never manifested because he had never tasted blood before, but who blood did he drink? And what is his devastating quirk?