Excite herself silently.

"Ms. Ralli..." Harley stifled a gasp, allowing herself to consider her teacher as she sometimes did in the limited moments of private she could steal in the barracks. "She can't expect she can just stand there, a mere foot or so away with that beautiful body of hers... a-and not get me at least a little excited. For Ms. Ralli's own good... I might use her to get myself... just a little excited..."

Flushing furiously as she found herself less hesitant to begin this dangerous idea than she expected, Harley kept one hand clapped over her mouth to avoid making any noise, while using the other to explore her body. It wasn't terribly comfortable to do it over her tunic and leggings, and it wasn't easy to do it quietly on the creaky wood floor... but she managed, as someone with a lot of experience making this happen in a barracks full of sleeping male knight trainees late, late at night. "Ms. Ralli doesn't even have to know... she can just keep standing there... giving quizzes in that rich, interesting voice of hers... speaking with those full, naturally beautiful lips... with those strong hands on her sexy, sexy hips... k-keep honorably, innocently showing that fantastic butt of yours, Ms. Ralli...!"

As Harley became further and further self-motivated in her study, she picked up speed in rubbing herself. Fortunately, even if anyone heard anything, it didn't seem to be a noise they could identify.

For Ralli, however... Even as she tried to focus on sensing her class outside the curtain, it was no use. The darkness of the tent meant nothing to a sightless creature like her, so Harley was essentially in broad daylight. Furthermore, Harley might as well be pleasuring herself with a jackhammer for how sharply Ralli's enhanced senses could pick up what she was doing while there was no other noise to distract from it. "My trainee... Harley Dustaine... is definitely masturbating behind me right now. Is she truly that preposterously horny, that she cannot wait until a less dangerous situation? Unless... she is stimulated by the danger of the situation. It may also be that she is stimulated by the thought of me... Wait. Human eyesight eventually adjusts to darkness. Could she be seeing me, and... masturbating... to...?"

The sergeant was embarrassed at herself, finding herself a bit heated at the thought. "I am being uncharitable. Harley is a diligent student. Also, it is quite egotistical and presumptuous of me to assume I am the target of her fantasy... The right thing to do is ignore her and put it out of my mind. After all... I am sure she cannot see me."