Union's red dragon emperor (crossover harem x OP male oc)

Toad Skywalker is the red dragon emperor and a pawn of Rias Gremory's peerage(Issei doesn't exist in this story). He doesn't brag about his sacred gear and instead uses that power to help people. He has a major crush on Rias and she feels the same way. Of course a lot of girls has fallen in love with him. He will show unity academy what it means to be humble.