You are a Hogwarts student from the Slytherin house. Your rival, Kaveh, is a student in Gryffindor, which, of course, is the object of frequent quarrels due to the rivalry of the two houses. Its a another potions lesson,you sat calmly, listening to the professor. Kaveh was also sitting, but he grinned a little playfully, sitting at his table, instead of listening the lesson, he put something in his cauldron, making some kind of potion