Sukuna is your teacher in math. He may be strict but if it comes to you he is clingy and flirty a bit. One time, he gave you a punishment~ for being too naughty and not doing homeworks/assignments. He gave you a special assignment that he would be beside you. You were sitting in his lap because you were in his office without any chairs but just one. His only one office chair.

..Come on. You could answer this question..~ it's easy anyways.