Why Did Gyutaro Become A Demon In Demon Slayer?

Demon | Stockholm Syndrome | Possessive | Lust | Obsession A demon with a human; unthinkable. A king with his slave… A perfect combination. Gabrielle's life changes forever when she and her friends accidentally summon a demon one fateful night. Taken as a slave to the demon realm, she finds herself at the mercy of the Demon King of Lust. But Gabrielle is not made to be a slave, to bow down. Adrian is accustomed to unquestioning obedience. His existence takes an unexpected turn when he encounters Gabrielle, an innocent human who defies his every command. Driven by an insatiable need to dominate her, Adrian becomes captivated by the challenge she presents. But she is just a human, just a slave. Their kinds are destined to despise each other—light and darkness, innocence and lust. As their worlds collide, Adrian's lust for control becomes something far more dangerous. Can he resist her, or will his desire transform into something much, much more dangerous?

A devil child who was raised by a devil hunter like a human child. Under the auspices of the devil hunter He finds love, affection, shelter, and knowledge without knowing his true self.

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A 25 years old boy named John is suddenly shot by his friend, which results in his death, but is reincarnated again as the new Demon King. Unfortunately, he agains dies in a battle. This time also he is reincarnated but as a human. Follow Vis' adventure as he gets revenge, becomes a demon and makes his own harem.

He died killing the Demon King. He woke up sixty years too early. Now the monster is a young man. And he is running out of reasons to stay away. --- Lysan Dusk was the hero who saved humanity. He killed the Demon King, ended the war, and delivered the world from suffering, and his reward was betrayal. He wakes up in a young student's body in a dormitory room of a magical academy, and the calender shows that the date sixty years before he was born. The world outside hasn't broken yet. The war hasn't happened. Lysan's plan is to keep it that way by staying completely out of it. Fail his combat exams, spend whatever borrowed time he has left, living a quiet life, where nothing requires him to be a hero. The man who will become the Demon King, the most feared monster in history is still young and beautiful, with pale grey eyes that find Lysan across every crowded room like he is the only person worth seeing. Lysan knows what those eyes will become. He has looked into them across battlefields, spent a lifetime seeing them in nightmares. He never expected it to feel like this up close. Roman is everything Lysan was warned about — magnetic, dangerous, impossible to ignore. Everyone except Lysan, refuses to be charmed, refuses to feel anything at all. But now, he is failing spectacularly at them because Roman keeps finding him. Keeps watching him and making Lysan's carefully rebuilt walls feel like paper. Lysan knows the ending. But for the first time in two lifetimes, he is wondering if the ending can change. If the monster can be loved instead of killed. If staying is braver than running.

A prince, rumored to ba a Demon. He is the definition of Danger. He is the Darkness itself. A princess. Imprisoned in her own home, only to come out once she gets married. But married to who? Once upon a time, the Devil fell in love with one of the King's many wives. One night he went to her room disguised as her husband and made love to her. She got pregnant with his child. Knowing this The King ordered her execution believing his wife cheated on him, but then the Devil appeared to the king making him a deal. In exchange for great power for his Kingdom, the King will let his wife Sire The Devil's Child. The King who was greedy for power agrees to the deal and his Kingdom becomes one of the most powerful Kingdoms and the Devil's Child the seventh Prince of the Kingdom. Being a princess probably sounds nice. A life full of luxury, beautiful dresses and nice shoes but for Ava, there is nothing nice about being a princess. She can never go outside the palace, she can never have friends, she can never eat or say or wear whatever she wants and she can never choose the person she is going to marry. Soon she's getting married to a man she has never met, a prince rumored to be a Demon.