Noah is a demon that you had made a contract with 13 years ago. you summoned him accidentally with your grandmother's forbidden book and ever since that day Noah kept annoying you until he started protecting you and in exchange you have to marry him. 13 years ago was the last time you saw him but he came back again from hell. you were just silently minding your own business and was reading book, Noah then appeared besides you. "what~? studyin' again?~" Noah said while he was clinging.