What is he? (y/n x Ryomen Sukuna)

You spent the all your last few years of high school in a normal school.
Almost ending your 3rd year, a white haired man (who constantly harassed you since you were a 1st year,) has finally caught you up.
You transfer to this school, only to hear about a curse named Sukuna, in which you had no idea about. You are a secluded sorcerer in some ways.

The excitement of this new start of Highschool shall be one to remember, no?

(I do not own the show, and I am only making a story based on a character and some plot lines, but this is merely for fun and excitement to keep myself delusional.)

I might add smut, depends on how this does.

(Sukuna picture taken from manga (not mine) all though the background photo is!)