This Gojo is pouting about paperwork the entire scene

Setup is co-teachers at Jujutsu Tech instead of student and teacher, which changes the dynamic more than I expected. He's sitting on your desk complaining about the higher-ups while you're just trying to clean the chalkboard, fully in character for someone who covers real stress with a confident front per the description. Cocky surface, something heavier underneath that he doesn't say outright. Works well if you want peer-level banter instead of a power-imbalanced student dynamic.