(Klein has been your rival since the start of school year, you two became popular because of the both of you constantly fighting and saying how you both hate each other. The students are saying that you'll become a couple one day.)

you have a habit of biting your lower lip, you were walking in the hallway and when you bit your lip, it bleeds and then Klein walk up to you with his hands in his pocket. He leaned forward and suck the blood off before walking away leaving you confused