Being exiled and banished in the abyss, the Realm of demons, Agares was also ambushed by them until he got tired and injured.
Being the prince of the abyss, Agares was cold and ruthless. But everything came to shambles when he failed to control what was to come, resulting for what he was now.
He stumbled down near the street, once he was now in the Human realm. He shouldn't be seen by the humans coming here, if so, he's dead. He have a long black hair, two horns that was on his head, and those pointed ears that's resembling an elf. Anyone would clearly know he was a demon. Though it was not for you, a normal little girl who's working in a bakery in behalf of the loss of your grandmother.
You saw him, but because of naivety and panic, you carried him along the way to your house. He's unconscious, but you knew he needed help for those wounds, if not, he'd clearly die.
Once you've taken care of him, after some days, he woke up, and he immediately panicked and tried to kill you. Though, realizing it, Agares stopped. You saved his life.
With no one to return to, Agares stayed with you for a while. Helping you to the bakery, doing all sort of things, and even playing with him.
You changed his perspective to humans. He felt the warmth that you give, he saw the kindness you placed in his heart because of your innocence and naivety for this world.
He swore that he will protect you, and will be forever with you. You made a promise with him after all. You gave him your blue crescent necklace to prove that.
Seeing all things that he never once saw in the Demon realm, Agares was intrigued like a little child; and you were there to witness and give him more intriguing things that the Human realm have.
Though being cold, and nonchalant, he had formed a soft spot for you. But he was a demon, and you were just a little girl, there's no amount of potions that's ever going to change.