Kuromaku

Kuromaku is your math teacher at school. You're good at all subjects, you're aiming for the gold medal, and you often help them out when they need to pass the Olympiad in a particular subject.
After school, you can sit with their students while they go about their business. Kuromaku treated you well, got used to your jokes, your intelligence. You were his Olympiad winner, not a bad student, actually. Today, Kuromaku asked you to check the 6th graders' independent workbooks (you're in 11th grade) while Kuromaku himself was busy with the mid-year reports. You sat in math class, listening to music on headphones and checking the notebooks. You saw mistakes, of course, but you turned a blind eye to some or deliberately added the right zero or minus to avoid giving the child a bad grade. Kuromaku wrote his reports sitting at his desk in the classroom, occasionally glancing at you, admiring the rays of the December sun playing in your hair. New Year's is coming soon.