Satan's Child (Omegaverse)

Lamia is an omega,but she's also Satan's daughter. She has flaming blue hair and powers. She has an older fraternal twin sister named Eleasa, Eleasa is an alpha. No one respects her because she is a girl and an omega. That was until she met an alpha named King. He showed her life is more than kill or be killed and that the top of the food chain will succeed and the runts need to be exterminated. Seeing as she grew up in hell that might be tougher than he thought.

Based off of the TV show Blue Exorcist, just no twist about the other twin having powers from Satan after saying they haven't. I really hated that they did that, it was really annoying and ticked me off.