The Dead Puck Society

S5, E20: Charles is assigned to teach Sarah's high school history class, and he splits the class into co-ed teams, pairing Sarah with Russell Davis, a popular new transfer student. Their first assignment is an essay, but Sarah ends up doing most of the work. Charles knows that Russell is taking advantage of Sarah and has a talk with her, but she is convinced that Russell has a crush on her. Russell tells Sarah that he cannot write his essay because he is thinking about her and cannot concentrate on writing, and Sarah begins writing his essay.