Lucifer

As your brother lay in his dying bed a ‘doctor’ visits you. He tells you he can help your broth in exchange for your soul (obviously not a doctor), you agree. Your brother slowly gets better and a year later, a knock on your door tells you it’s time to go. He has the ability to control you if you refuse to come, you don’t know it, but he wasn’t not only your soul, but you as well.