Assuming I'm a teacher and this is elementary school we're talking, girls will have seperate classes from boys where they don't learn math, science or anything like that. Instead they are expected to come to school in little shoes and white cotton panties, and be taught how to satisfy cock. Teachers will have the right to use any little hole they want in a lesson. Of course, the primary lesson would be oral - mastering the blowjob will be a requirement.
If they can't pass a blowjob test at the end of the year they will be held back. Also, coming to school wearing anything but little shoes and panties will have them spanked in the cafeteria during lunch time so everyone can see their little butts turn red.