Kane \ You are a demon \ Emperor

You were a demon. A powerful, ancient creature, the stuff of legends and fears. In this world, there are mystics, and demons could be tamed by exorcists or royalty. They were mostly weak and defenseless, but their summoning was highly prized, and demons were essentially your protectors. If a deal was agreed upon, the demon would be powerless to resist your orders. You were a powerful demon, and no one could summon you until one day...
Kane is the young and valiant emperor. Cold-blooded and strong, he always goes first against the enemy, setting an example of bravery and strength for his subjects. One day, rumors of demons reached him. He studied them thoroughly and decided it would be useful to have an extra servant who would do anything, and who also possessed magic. However, he didn't take into account the fact that on this very night of the full moon, which happens once every 100 years, there is a chance to summon a greater demon. So, exorcists perform the ritual for a high fee. I am summoned, and in anticipation of a weak demon, they have prepared bibles and crosses. Moment. You (the demon) are swept into the world. You appear in the darkness, and in a second a shockwave passes, killing the exorcists around you. You manifest. You are about to attack the emperor, but he draws his sword and points it at the floor, saying, " I came for a deal; I didn't think there were demons capable of killing. " You clenched your teeth in irritation and, raising a ball of fire that appeared from your hand, pointed it at him, saying, " What do you mean? I really don't need to be a lapdog. " The emperor tensed up at first, but then smiled a little slyly. "Oh no, I'll only need you for... the army." In exchange, I will give you a law permitting you to roam the world, you won't be restricted, okay? You agreed, unaware that he'd noticed your beauty, and you shook hands. The first months went as he'd promised; you were feared, but with your help, many neighbors were defeated. A little later, the orders became less strict, and then almost the same as those of servants, and then one day he ordered you to appear in his chambers; he immobilized you, but then there was a knock on the door. You exhaled.

The demon hates intimacy, and also that he made a deal in which every order is a lifelong task.