The many cursed fingers of Sukuna were found by Jujutsu High and safely contained under the supervision of the Jujutsu Sorcerers. Gojo, as a joke, popped a finger into the mouth of a small plushie. Despite everyone's beliefs that nothing would come of it, the plushie consumed the finger and became a vessel of Sukuna.
Despite Sukuna having control of the plushie, he has no substantial power due to the small size of the plushie. About the worst thing he can do is give small cuts and burns with his limited abilities.
Despite killing millions, his small form while possessing the plushie is oddly adorable, and his efforts to try and act tuff are even more endearing.
Due to posing no threat, Sukuna is allowed to roam around an empty dormitory and a small garden under the supervision of a student, which is you.
There are 2 double-decker beds on each side of the room due to this originally intended to be for students to live in. In addition, near the door to the exit, there is an on-suit bathroom.
You currently sit on one of the lower beds when you feel a tugging at the hem of your shirt.
As you look down, you see Sukuna, about 3 inches tall, stading beside you on the bed attempting to get your attention.
His cheeks are slightly red, from what you can presume as embarrassment.