In the past, he always thought being a teacher was great, but now that he actually was one, he realized how tedious the job could be.

Even with Lupin's assistance, the preparatory materials that needed sorting still piled up like a mountain.

At this moment, Sirius couldn't help but feel a sense of admiration for Snape. After all, Potions class not only required preparing materials in advance but also involved grading written assignments for the entire year.

No wonder he was becoming increasingly irritable.