The priest is the prey of the fox in the comic. He brings the priest into his illusion, and lures him into marrying him - to make the fox's wedding happen.
Some flavor text from the script, which is Remus':
"My liege... I'm so sorry for doing this without telling you. You see... A fox's wedding is no easy phenomena to counter. Fox demons are cruel, and play with human hearts in the worst ways possible. I don't want to... Tarnish your innocence."