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Esther's class differed wildly over Corona's, as Sir Kimbra preferred to teach in a more practical way over just talking over theories and the like. And Esther welcomed that very much. Unlike Corona, she couldn't stand learning just raw theoretical stuff. Too boring for her.

The class today was about the so-called Sterling Engine, an engine that worked by utilizing the difference between temperatures. Sir Kimbra didn't spend much time talking about how it worked on paper. Most of the class was instead spent on him bringing out all the fancy forms of Sterling engines that he possessed in his repository and demonstrating them in the class. He even invited the students to go to the front and take a close look at them.

Esther, naturally, took that opportunity right away.

Putting down her cup of coffee, she nearly ran towards Sir Kimbra's table where all the devices were displayed. She started from the device that could run just by her body temperature. Just by her putting her hand on the device, the turbine inside would move.

"Oh wow, this is amazing!" she exclaimed with glimmering eyes. "Now I want to incorporate this engine thing into Castle as well!"

Her brain immediately went into overdrive, imagining all the upgrade possibilities she could do to it. She bent forward, examining the device really, really closely as it worked.

"Hmm, so this goes there, and that goes here..." she mumbled, lost in her own world.

Entirely ignorant of the fact that she was exposing her panties to the rest of the class, as her one piece dress had risen up by her bending over like that.

In retrospect, she probably should not have worn such a criminally short dress in the first place, especially with how absent-minded she could get whenever something caught her interest. It was an old dress, well worn for years of her being in the academy. At first it was mid-thigh long, short yet still at a reasonable length. But now, after shrinking little by little from multiple laundries and her getting taller as well, it only barely covered her undergarments, matching its length with the outer jacket she wore. Any kind of bending over would no doubt reveal her unmentionables to the world. And she certainly had to be more careful of any kind of breeze or even when she walked up the many academy stairs.

Or she could just wear one of those spandex shorts some girls liked to wear under their skirts and save herself the trouble.

[s]But where's the fun in that?[/s] Wouldn't work. She believed it would clash terribly with her style and she would just look odd wearing them.

And a lot of male students in the academy were certainly thankful for that belief, including the ones that participated in the very same class she was in right now.

Unfortunately for them, the girls of the class were already ready, and they quickly blocked the view with their bodies, giving a couple of deathly glares towards the boys that were staring too obviously towards the oblivious girl.

Indeed, this had happened so many times that the other girls had to be the one to protect Esther's chastity. They had told her over and over about how she should be more careful with how she moved, but Esther just kept doing it over and over again.

One of them came to Esther and whispered, "Esther, you might want to straighten up. Your panties... they're showing, you know."

"A-ah!"

Esther, brought back to the real world by her whisper, quickly did as she was told. She stood up straight with her hands pulling down the back of her short dress. Her face was red as a tomato.

"T-thank you for that, Mylina," she whispered back with an ashamed smile.

Two more times a similar exposing incident happened in the class, and every time one of her girl friends would block the view and warn her right away. Esther might feel embarrassed for a short while but she quickly forgot everything once she returned back to her own little mechanical world. Such was her character. It might not work well if we talked about her being a girl who wanted to keep her undergarments from not showing, but with her being a student, she was the best of the class. She just had a knack in both understanding a complex device just by looking at how it worked and a knack in the actual mechanical construction itself.

When the class was over, she already decided on what the next upgrade for her Castle would be.