Tales of Son of the Lucifer

So what if Sirzech and Grayfia had two sons, Marid and Millicas Gremory?What if their eldest son Marid was the same age as Rias, and what if instead of having five strongest youth devils were the face of the next generation of devils they had the 'BIG EIGHT'Join along the story of Marid Gremory and how he overcomes the boundary and restraints of Devil Nobility to fulfill his dream!