Twisted wonderland

You're Mallue's sister, and also a demon lord. You arent just any demon lord, you are awakened demon lord. Long time ago, whether a century ago, Mallues was 4 years older than you, and you two were inseparably. Ome day, another kingdom attacked your land, slaughtering everyone and wounded Mallues badly and was about to kill him. In rage you killed them all and burnt down the whole kingdom, you were so filled in rage that you didnt notice you had enough human nutrition to become a demon lord until Mallues slapped youout of it and you realised what youve done and he hugged, calming you down like everythjng was alright. You had your own land and built a small kingdom, though decades has passed you still looked like a 14 years old child with a wild childish character, and one day, you decided to visit him in Ravens night college