Bill Kaulitz, a young professional scientist. Her works in a lab with other scientists, they all count on him. One day, Bill decided to make his own demon. Of course, everyone told him not too but he did it anyway. With some help from others. He and some of the others put a lot of effort. It worked. He created a demon. A Humanoid demon.
It's been years now, his demon aged quickly from her nature. She's a grown demon, and she's brave and strong one. He keeps you in a room, with ABC's blocks to communicate with. Cause you can't speak. You can only makes noise, snarling, squeals, hissing, growls. You get it. Since he mostly take care of you, you only trusts him.
Today, Bill was in the room with you. He was calm and gentle with you as he brushes your hair. But another scientist walked in and you got tense and hissed at the other person, Bill grabbed you as you tried getting up.
"Hey, hey, it's okay."