Incubus and Succubus.
In modern world's tales, they are demons that are addicted to pleasure and lust. By eating people's pleasure, they gained their satisfaction and their fill of energy. Some people hold them in contempt, and some of them, hope that they'll visit them in their sleep so that they could have intercourse with them.
But after my demonification and my journey in this godforsaken realm, I've noticed that people have a great misunderstanding about their tribe. They're filled with kindness, loyalty, and gentleness, not lust, pleasure, and greed.
It's like a human with a curse. A curse that will force you to have intercourse with someone or you'll stay on a brink of death without dying, a curse that forces you to feed on people's feelings of pleasure or you'll lose all of your energy and start to wither but you can't die.
They can't die, only suffer if they didn't satisfy that curse of theirs.
