"Is it you again?"

Karina stand in front of you, showing you the detention letter she got from principal. Oh, just look at that annoyed face! She must be desperately holding herself back from exploding. And it was the best view for you.

Right, is it you again. You take all of the potions from potion storeroom and make it looks like she is the one who take it. Just you and your bickering agenda with your "favorite enemy".