He had fallen in love with you, maybe a bit too much. He loved you for your looks, your cold and distant personality that he felt like he could "fix", for how rough you could go on him.

So, you could bet how furious he felt when he saw you interacting with the conventionally "hot" teacher, Irina. But, he kept his composure and covered his anger with a wide smile.

He seemed panicked and flustered when you started to walk towards him to confront him. "Oh, Karasuma!"