They exceed expectations

With that, I turned to face the board again to write up the next problem. This gave the class a perfect view of my ass.

"Omg his butt is so cute, look how it shakes as he writes on the board."

"Awww he must be embarrassed, his cheeks are blushing"

"He's facing the board, how can you see his cheeks.....Ohhh I get it now."

Hearing the girls talk about me in this made was both thrilling and daunting, but I had to focus. I needed to come up with challenging problems for the students to solve. Otherwise, this whole ordeal would be for nothing. I worked up something which included some of the material we covered recently in class. I stepped back and allowed Gina to take over.

Gina took her time, I could see her struggle with some aspects of the question. She paused and took a step to review her working out so far and even from where I stood I could see a clear mistake in her answer. For a moment I felt a glimmer of hope. Perhaps I'd be able to put my towel back on sooner than I thought. Unfortunately, or perhaps fortunately, Gina realised her mistake and fixed it up. I couldn't help but feel a little proud of her improvement.

She stepped away from the board and I could tell before she announced that she was finished that her answer was correct. "Well done Gina, that was a tricky one. I thought I had you for a moment but good job taking a moment to review your work and look at it from a different perspective."

"Yes! Ok Professor, you know what that means!" Gina gleefully came up to me. She handed her phone to one of her friends who took a photo (or multiple photos) as Gina put her hand between my pecs. Using her pointer finger, she traced a line straight down, gently caressing my taut stomach and eventually landing her fingers right above my shaft. Her five seconds was definitely up, but quickly Gina took hold of my penis and gave it a gentle tug. She then ran back to her spot giggling.

"look, he's definitely chubbed up a bit since we started." I heard one of the girls whisper, and I couldn't deny that my penis was now fuller than it was when I came in.

"Alright class, who's next?" Almost every hand shot straight up. And from there a pattern was set - one of my students would come up, answer a question, then take a photo whilst they felt me up. Amazingly, every single one of them answered correctly.

Though they each answered correctly, they all had very different styles when it came to the photo or touching my body. Some girls, like Ingrid, were bold - they made sexy poses for the photo, freely grabbed my shaft, or flicked my nipples, or spanked my butt. Others were clearly shyer about the whole situation. They wanted to take part but felt a bit self conscious (which i felt was ironic given i was the naked one). These girls would just stand next to me with their hands around my shoulders, or just touch my biceps.

When it was Scarlet's turn, she had me turn around so my back was facing the camera and had me look over my shoulder. She grabbed my cheeks and pulled them apart; "Ingrid make sure you zoom right in." Then, before I knew what was happening, I felt Scarlet's finger lightly trace my hole and then push in gently. My dick was harder than it had been all day. And then, as quickly as it started it was over. Scarlet pulled out and was back in her seat. I turned around and my erection was now throbbing as I went back to the board to write up the next question.

"alright class, who hasn't hard a turn yet?"