Wife of a demon lord

Luna is replaced, after her sister, Maia, refused to marry the demon king from Golgotha. She had heard rumors about this demon Lord, of how he killed all his wives on the ninth day of their marriage. Will Luna be an exception? Or Will the Demon king keep the marriage vows he had made on their marriage? “I Damien,” He began, slowly, Luna opened her eyes and gawked at him. Then he continued, “I give you my word today, that I shall be by your side till eternity, I shall not let any harm come to you as long as I am. I vow to keep alive and safe from all enemies, I vow never to force you to do anything against your wish, and I promise to be with you until eternity,” He said, the hall was silent, Luna was shocked as tears trailed down her face. She refused to believe his words, patiently waiting for her death. But life plays a great trick on her when she realizes she was slowly falling in love with a demon! Slowly, as she begins to envelops her feelings, she discovers a hidden secret about herself...