When Charlie Dean showed up at Sybil's dorm room and interrupted her workout, he found her eager to try some more intense workouts. When they start having sex, things aren't nearly as interesting as they were in the next room, where the studious Stacy Cruz is spending a quiet and rigid evening reading. However, when Stacy hears what is happening in the house next door, she decides to masturbate. But when she starts touching herself, Sybil gets fucked so hard from behind that she penetrates the adjacent wall — with her face right touching Stacy's pussy. Intrigued, Sybil takes over while continuing the sex, things get wilder when Charlie catches up.