Although Staci Silverstone was unable to register for the planetarium excursion, she is very eager to go. She is informed by Professor Knight that there is nothing he can do for her because the tickets have already sold out. However, Staci is tenacious. She tells him she'll do everything to earn a ticket since she is so determined. She rips her professor's enormous dick out of his pants, shoves it down his throat and then gives him the best classroom sex of his life by exposing her gorgeous natural tits! That only occurs very infrequently.