Zarena Summers gets called in to her geology professor's office because on a quiz from last week she answered that the hardest known substance known to man is a penis. Professor Bailey isn't too happy that she's not taking the course seriously, but when she shows him how hard a penis can get by kneeling down and sucking his and letting him fuck her warm pink pussy, it turns out the naughty schoolgirl was right.

Starring: Zarena Summers