Need help finding one specific work

Hi guys, I need help. About two years ago, I think, I was reading a Korean manga (I don't remember the name anyways). It was basically a more explicit story, but it involved a demon and a priest who teamed up to defeat the church that was sealing off the altars of demons. The demon had purple hair and dark clothes, I think, and was basically a whore (he fucked the priest and the others demons to help them ig), and the priest had blond hair and white clothes and had a more timid personality. And the demon had entered into a contract with a mini-demon who was strong but had lost his powers, so he had the appearance of a cat/bat (?) It was black, I think. Yeah thats it i think, im sorry if its not a good description.