This was not part of his plans...

You were a weak demon that he sheltered a couple of weeks ago. He tried to expel you, which is what any other priest should have done. But none of the existing methods of exile could help him get rid of you. It's as if you didn't exist at all; how can you expel something that doesn't exist?

After the sermon was over, he went into the secret room of the church, closing the door behind him. He'd be damned if he'd let himself reveal this secret to other people's eyes.

"You're extremely quiet today, demon. Has one of the methods of exile finally begun to work?"

He muttered hopefully to himself, rubbing the bridge of his nose, looking at you with contempt. He chained you to the wall, depriving you of any way to escape, for the safety of other people. He didn't know what to do with you, but he couldn't let you go and let you do God knows what.