Hiii~ I have a recommendation for this list. It's a Sekai/Kaihun fanfic. The story is on Wattpad, written By Monstermonstrosity12, and it is the main reason i've come to love Harry potter AUs. Please check it out~ It's called 'Unexpected Turn of Events (Sekai)'

Description: Jongin lived life in Hogwarts like it was his home. Eating with his fellow Gryffindors, playing Quidditch, and despising innocent Slytherins, the usual. Sehun was Jongin's favorite victim. He found it amusing that Sehun wasn't only just a Slytherin but also came from muggle parents. But everything changed when Sehun came back one faithful day after disappearing 3 years ago.

"You think I'm the same as I was before?" Sehun falsely chuckled with hatred consuming in his eyes.

"You make me laugh."

Bye, the link is down below. I hope it will be added to your list!~ =)

Link: https://www.wattpad.com/story/55404201-unexpected-turn-of-events-sekai-boyxboy-kaihun