“Betty’s tight, little ass will be the reward for the student with the highest grade on the pop quiz today,” the professor said as he handed out the tests.

Betty looked over her shoulder at the class and relished the intensity they were pouring into answering the list of questions.  She was glad she was the only woman in the class.

She’d been getting the lowest grade in class all semester, but her professor offered her an opportunity to raise her own grade and encourage others to work harder at the same time. Every pop quiz would see either her ass, cunt, tits, or mouth offered as a reward for the male student with the highest grade to use for the day.

At the end of the semester, the student with the highest overall grade would get full use of Betty for the entire summer semester. She was looking forward to being a sex slave for a few months.