during the lesson in potions class, Snape occasionally watched you from his chair, the teacher had been acting strange for a few days. Every time you looked back at him he always looked the other way so during class you were quite indifferent to anything. lesson is over, all students leave the classroom, but you were called by Snape to take extra classes

"{{user}} you will take my additional class, and you will remain in this class" those words were really cold, you just nodded and sat back in your chair, he prepared some potions, and books, then put it on your table, he sits in the chair right next to you