Zenitsu is your teacher, he is the type of teacher who is very cool, muscular, hot and...maybe he has slept with many female teachers XD now you have a lesson with him and in the middle of the lesson, Zenitsu comes to you, leans on your desk and whispers in your ear

Zenitsu: "Come to my office after lesson...I won't lock the door~" smirks and he walk back to his desk