She teaches the lesson, as Liam commands.

Ralli reached her sword... but, before she could pick it up, Liam kicked it away from her, sending it clattering across the arena. As she tried to crawl for it again, her unlikely oppressor planted the heel of his boot on her ass, stopping her in place.

"I'm having a hard time figuring this one out, Teach. What are we supposed to learn from this...?" he asked, his green eyes half-opened now to leer down at her broad backside as he ground his boot against it.

"Gh... Agh..." Ralli groaned, her face burning with shame as she grit her teeth tightly. "On the battlefield... You must carry a second weapon... Alternatively... Be prepared to fight unarmed. Never show your back-"

"Your what?" Liam asked, cupping a hand to his ear as though he was hard of hearing.

"Your... ass... Never show your... big, fat, disgraceful ass to the enemy..." Ralli growled, burying her face against the dirt to avoid showing it.

"Unless...?" Liam continued, giving his sword a few practice swings that looked more appropriate for a sporting range than a battlefield.

"Unless... you want it to get spanked...!" she finished, finding herself wiggling her hips improbably and helplessly at her tormentor.

"Yes... just like this!" the young man shouted with excitement as he swung his sword more like a club to belt it across Ralli's behind. It seemed... more pliant than he expected. He couldn't figure out why. "What, when I order her to drop her defenses, she stops clenching her butt? You're just too weird, teacher of mine..."

"You... struck me..." the sergeant spoke from the ground, sounding miserable. "What do you want now...?"

"I think we should continue the lesson, Teach!" Liam laughed, using his foot to kick her skirt up so that her undefended cloth undershorts were exposed, along with her dark thighs, dripping with sweat. Giggling, the young man drew his practice sword back with a grin like a devil...