No. She loses control

The girl shifted in her seat. She tapped her fingers, tried glimpsing out of the window, bit into her own arm... she even tried to focus on her classmates staring at her again, or on her near-nakedness itself. It didn't help. There was no way to distract herself from the hellish itching down below. Kiyomi lifted the micro-skirt a little to take a look - it looked almost as bad as it felt! Worse, it looked like something else as well. Her outer lips were red and swollen, her clit too. A bit of moisture was seeping out, she must not have noticed it over the itching. It looked like she was desperately horny! Well, that may have been true, in some sense. Her genitals were indeed aroused. And if she touched herself, no matter her intention, it wouldn't only look like she was masturbating. Her sensitive places would react to the touch, and...

"Kiyomi?" The teacher raised an eyebrow at her. Just then, she noticed how she was audibly groaning, trying to keep herself together. Mr. Green ignored her again, and started lecturing about something, but she couldn't hear a word he said. Despite all the consequences she was aware of, despite the fear that doing this might fail her this ridiculous cheerleader challenge: she could not bear it anymore. Just one scratch...

Her hand flew to her pussy, and as her fingers roughly dug into her outer labia, the effect was, as expected, twofold. The relief of scratching, plus the sensation of stimulating herself like this. Already she could not suppress a small moan. And she was still aware of how humiliating it was! Yet, now that she had started, there was no way to stop herself. She continued rubbing, gradually switching to her equally itchy inner folds, and after she had briefly focused on her clit, the lubrication was picking up fiercly. Her movements were now producing an audible wet sound, and combined with her labored breathing and occasional moan, it wasn't long until everyone picked up on it.

"Kiyomi? Are you... now seriously. You can't just- Kiyomi, listen to me! Stop!"

She just barely took notice of Mr. Green, and only when he grabbed her arm and loudly repeated his command did she manage to give an answer.

"Aaahmm... I'm s-sorryyyy.... aaahh.... it itches..."

"Likely story, you little nymphomaniac. God, this will be such a hassle... there will be committees, and... I better go to the principal right now so we can get started..."

"Wait!" It was Nikki; she had several emergency plans ready, of course. "She's not lying! It might be an allergic reaction. Better get the nurse, quick!"