new etiquette rule in class

As the teacher speaks she can notice whole the student's looks going to her pussy and she can notice whole the guys and most of the girls are excited about it.
The class is a short one and when the class is over noone gets up but Ayumi. She wonders why untill she checks the etiquette rules: the hottest girl in class has to give a blowjob to any male present once the class is over
Ayumi is attonished this may be happening, but she's sure of having had to do it every day since she was 18
So, bending next to the nearest mate, she takes off his cock and starts sucking it