In part four, the professor had already shown his bondage students; Blake, Natasha and Bridgette, how to tie each other up, tickle and flog. Now, they need to learn how to escape, and if they can escape quickly, class will be over. The girls immediately get to work, pushing their chairs in a position where they can untie each other. One by one the girls get each other out of their handcuffs, then untie themselves. As the girls are all almost fully escaped, the professor announces the next lesson; two girls will team up and tie up the third.