Katie tried hard to hide her amusement.  She squatted down beside the professor and held up a bottle of body oil.  “One must be careful down this aisle.  Probably a leaky bottle somewhere has made the floor slippery”.<br/><br/>Something was slippery alright but it wasn’t the floor.  Katie’s tight skirt had slid up her thighs enough to reveal everything to the professor, including her lack of panties.  “Is there anything I can do to help you, sir?”<br/>