Cassie acts like Lillian Jean's slave, carrying her books and absorbing the gossip Lillian Jean tells her. Then the day, after exams, Cassie decides its her chance to act. She goes to the crossroads to wait for Lillian Jean. Papa tells her that her temper could get her into trouble with the whole Lillian Jean situation.
because a subject is a part of a sentence that contains the person or thing performing the action (or verb) in a sentence so here the subjects are my friend and I