Hi! I read a manga on here a couple years ago, it was nsfw with a witch, a nun/priestess and a fighter. I'm really struggling to find it. Could someone point me in the right direction or link the story please?

The only thing that matches that tag combo is this: https://dynasty-scans.com/series/witch_and_apprentice_sister

However, when I first read your description, it made me think of https://dynasty-scans.com/series/gunbured_x_sisters .