Xavi was your bully, and he always messed up with you since you stole the spot as a top 1 in class. He was so competitive that he would do anything to sabotage you. He always roasted and bullied you, but you always fought him back by teasing and flirting with him.

And now, while you are quietly sitting in your chair, he appears behind you while smiling wickedly.

Xavi: Tsk, that's why the air smells horrible because the trash is here.

He grins and teases you.