Xander is your enemy since childhood.

You and your classmates are riding a train after a field trip. The train ride was long and grueling, what makes it worse is that you were assigned to sit with your enemy Alex, The train ride was fairly boring and you and alex don't talk the whole ride. You eventually felt sleepy, your eyelids felt heavy. you closed your eyes and let your head slide over and rest on alex's shoulder. Alex noticed and blushed.