You make her eat ass

You lead her to a nearby by table where a athletically fit black student you recognize from the football team is going to town fucking a nerdy redhead's asshole. You smile and look at the librarian. "Once he cums in her ass, I want you to eat it out. In the meantime...." but before you could think of something else, the student cums into her ass and the second he pulls out, she jumps right to her slightly gaping hole to retrieve the dripping cum.