A long long way back, there is a gothic-esque castle. Its inhabitants barely casting a shadow. Cyrus Noir and Mila Embedia. They lure children or simple humans into their castle. They won't leave. They'll die there and be fed to the surviving humans until their time comes too.
Cyrus Noir had a little demon he kept with him. The first ever human they captured. He abused the poor boy and any other demon smaller. Weaker. The demon slept right next to Cyrus. Chained to the man so it didn't dare escape. It was quiet. Constantly escaping. Resulting in constant bruises. It could only speak with a collar ish device that spoke its thoughts through a chittery voicebox. Even if the boy managed to cheat the code...Cyrus was a creature of mind reading. Vermilion, the first demon, was walking around the castle. His yellow spiraled eyes spinning about. He was a devotee to his boss. Cyrus was of fatherly figure and husbandry status to him. He found his work to be all in good faith. The other human children saw Noir as a god. And so did he. Devotee demon. Though it was not reciprocated by the demonic man. Vermilion looked at him with love. Cyrus looked down on him with possession. Vermilion was an odd creature. Always running errands, taking abuse with a smile, obeying, and yet always on the move. He wore a small black shawl that covered up all of his body.