Pretty much what I expected.

"Good day to you class, I am back again," my heart was hammering wildly "I have come to supervise and assist this study group any way that I can." There was some cheerful hollering and applause all through the room. I knew they weren't clapping at my aid they were happy seeing me practically naked again. I blushed and walked towards the whiteboard that was left here since my last visit; keeping my hands around the waist of my towel. I could tell by the equations already written on it that my students were actually using it to study. I felt a brief moment of pride for them before they started talking, "Now if you would just turn your attention to the board..."

"The board ain't what got my attention." One of the girls who was checking out my ass spoke.

"Tell me about it. How am I supposed to concentrate on anything but that sweet ass?"

"Forget about that ass, since when did he shave down there? Not that I'm complaining."

"Still it was nice of him to come teach us in the buff. Now if he could just drop that towel..."

"This must be our reward for getting our grades up."

"Dude! Had I known the teacher would get naked for a higher class average I would have been studying months ago!"

Trying to ignore their jibes, I cleaned off the board with one hand while holding my towel with the other. I crossed my legs for additional concealment as I stood next to the board to give a lecture. As I wrote a variety of variables and numbers on the board some of the girls snickered at my state of undress while secretly taking pictures with their phones. "You had better be using that phone as a calculator otherwise I am going to be quite cross!" I shouted.

"Crossed? Like your legs right now?" My student, Tia was her name, chuckled.

"Seriously Prof. we know what you're packing down there, give it some air so we can admire it some more." Another girl in my class, Estelle, shot me a wink

"A-Absolutely not! I will not permit any more distractions during the lesson!" My face was burning hot as I clutched my groin. As if that would make me feel less exposed.

"How about if we answer the next question correctly you give us a little flash?" Another student, Doris, suggested.

"Honestly class, do all of you enjoy seeing me naked that much?"

My question was followed by a unilateral 'YES' all around. "It's the best you ever looked Prof!" Estelle commented.

I frowned but I agreed to their terms thinking I could conjure up equations so advanced that my slacker students couldn't possibly answer them. "Very well, but in exchange, for every question you get wrong you have to come back here for another hour of study group understood?" Everyone nodded happily.

I wrote down an appropriately college level equation to solve on the board. With my legs still uncrossed now I called up a volunteer to come answer it the difficult problem. The first up was...