Just Pierce This Membrane

There was still some time before Aragog died, and Jon had something else to do during that time.

So, late that night.

A silent figure walked out of the darkness toward the castle gates. Peeves was waiting there, clinging to Hog as he did on ordinary nights.

"You look like a child right now. You've lived for over a thousand years already—why are you still so clingy?"

"Because he doesn't mind," Peeves said nonchalantly. "Besides, you're not a spirit, so you can't understand this feeling. You have no idea how comfortable it is for me to sit on his shoulder like this. It feels just like sitting on the roof of Hogwarts."

The three of them waited there for a while before Filch finally arrived after his night patrol.

"Sir, what do we need to do tonight?"

"We need to open a gap in Hogwarts' defenses, but that won't be easy. That's why I need you, as Hogwarts' caretaker, to work together with Peeves."

"But my magical ability isn't particularly outstanding, and I don't..."

Jon waved a hand.

"I don't need you to have any particular ability,

"If I truly needed you to do something, I wouldn't have had to come here tonight. I brought you here mainly so you could familiarize yourself with the location of this gap.

"And this gap can be controlled. You'll need to work with Malfoy to open and close it. Professor Snape will notify you when it is time to open it.

"Most importantly, after that most important matter is finished, I may very well no longer be here. So you'll be responsible for repairing this gap.

"These things need to be done in secret, so don't let anyone notice what you're doing. But given the reputation you've built up among the Hogwarts students