3. Spanking the Mistress
“How about we try spanking?”
Only then did the two of them look at me. But from their expressions, it was clear they hadn't really been paying attention to what I'd said. Leden alone mulled over my words for a moment before letting out a short burst of laughter.
“What kind of ridiculous idea is that?”
I'd been seriously considering it and come up with a hypothesis, so why this reaction? Did they really think my ideas were worthless? But I couldn't exactly blame them. I was just an ordinary guy summoned from a world without magic, clueless about this one's knowledge or spells. How could I possibly solve their problems? This wasn't them ignoring me—it was just common sense to exclude me.
That made me wonder if I could actually come up with a decent solution. They were limited to imagining within the established rules of magic in this world, but I, utterly ignorant of it all, might draw from freer associations! But Sena dismissed it, and Leden gently scolded me.
I had to convince them. “Think about it. If magic is tied to emotions, then the power of magic is measured by those emotions. To stir emotions, your own mood has to shift first, and that comes from external stimuli.”
This tied straight into conditioning. “You can tweak your condition by eating good food or going shopping to adjust your emotions, but deliberate methods include pain, too.”
I mimed a switch cracking down. “Getting hit puts you in a bad mood, right?”
Suddenly, a memory flashed in my mind. My club junior. Even after her ass turned bright red, she loved it, juices dripping down her thighs. My words caught in my throat.
“W-well, some people might like it. But if we try spanking, wouldn't you get a feel for it?”
“But basing magic power on violence feels too crude...”
“No.”
Sena's eyes sparkled as she lifted her head. I'd never seen her show emotion like that.
“It's a hypothesis worth testing. And it's simple to experiment with.”
So we decided to run a quick test on the spot. First, the essential tool for any magic researcher: the magic measurement device. Two crystal-handled grips connected to a long glass cylinder, filled with liquid inside which floated a disc. Precise measurements were etched on the glass exterior.
Sena gripped both handles and poured all her magic into it. The liquid bubbled furiously, pushing the disc up. It rose just past the two-thirds mark on the cylinder.
Leden quickly noted the reading. “As expected of Lady Sena. Even pro magicians couldn't dream of these numbers.”
From what I knew, Sena's skills already far surpassed any pro. Some students even pegged her as the next academy director.
“Hoo... I've been stuck at this level for years. I hope this experiment yields something meaningful.”
Leden looked worried at Sena's enthusiasm and lowered his voice cautiously. “My lady, wouldn't it be better if I did it? Seeing you get hit...”
“I'll do it. Leden, you're a doll—not a proper magician. It has to be me, a real magician, to meet the conditions.”
“My lady...”
“Now, hold out your hand.”
I grabbed a rod meant for wand-making and used it as a switch. Sena extended her hand, but I hesitated at first. It wasn't fear of the pain. In this isekai world, there was no concept of “punishment.” If it existed, it was legal “penance,” not violence. Resorting to force meant torture—and I couldn't do that to her.
Sena fidgeted before offering her hand back. “Spread your palm. I'm going to hit your hand.”
“Ah, like that.”
She flipped her hand over, palm up. But she tensed it so white-knuckled, I knew it'd hit bone for sure.
“Uh... loosen up a bit.”
“Not like this?”
Finally, she got into the standard school-palm-whacking pose.
“It'll hurt, but bear with it.”
“Don't hold back. Hit me as hard as you want.”
Damn, that sounded hot! But I wasn't going full swing—I snapped my wrist with moderate force.
Crack.
“Ah!”
Rookies. She flinched at the last second, and it caught her fingers. She yanked her hand back, clutching it, staring at me with wide, reproachful eyes I'd never seen before.
Embarrassed, I chewed my lip before deciding to switch spots. “Let's try somewhere with more padding. Calf, thigh, butt, forearm—what do you say?”
“I'm against anywhere that shows skin. Summers mean thin, revealing clothes—no marks allowed.”
That left only one option. Ass.
I swallowed dryly, eyeing Sena. She closed her eyes briefly, pondering in silence.
“The butt's perfect for punishment and stays hidden in summer. I've spanked plenty before coming here, so I'm confident.”
“H-how can you say that!”
Of course Leden freaked. “Lady Sena, heir to a great magical house! A grown virgin letting a man spank her ass?!”
“Then the calf...”
“Enough, Leden.”
Sena silenced him, her resolved eyes saying she could endure any shame or pain for this. “Magicians bear the fate of reaching the Realm of Magic. This is nothing.”
“If that's your will, my lady, I have no choice but to accept.”
Leden stood, bowing to her. “But as your magic doll, born of your blessing and having cared for you since childhood, watching is hard. May I wait outside?”
“Do that.”
Finally, Leden gripped my shoulder firmly—not a warning, but a silent plea for meaningful results. Now the messy lab held just me and Sena.
“So, how should I position myself?”
As a punishment newbie, she sought my advice. I taught her the classic: hands on the desk, leaning forward to present her ass.
“Lower my back more? Raise my butt higher?”
“Like this?”
“Hm. Your back's not very flexible. Do you work out?”
“...Grand says the same thing.”
After some tweaks, her pose was perfect. I brought the switch near her ass.
Whoa, is this really happening?
I'd spanked my junior's ass plenty, but never dreamed I'd do it here for a different reason. And to my mistress, Sena Michele! The cold, mysterious woman's ass, so unfit for punishment!
Thwack!
I swung once, but it didn't feel right. Two more, and I got it.
“This skirt... it's got some kind of enchantment for a thin fabric?”
“Right. Our uniforms have physical resistance enchantments.”
“Th-then... you'll have to take it off?”
“No choice.”
Undressing in the academy dorms—not the dorm, the academy itself. Hot. Sena unbuttoned and slid off her skirt, instantly in panties. She glanced at the fishnet ones before asking,
“Panties too?”
“Uh... y-yeah, take 'em off.”
She stripped them without hesitation. Top still uniformed, bottom fully bare. Quite the sight. More embarrassed by the exposure in school than showing me her lower half, her cheeks flushed faintly.
“Never thought I'd end up like this at the academy.”
“Let's finish quick. Present your ass.”
“Present your ass” sounded oddly erotic. She resumed her pose. Bare ass versus skirted was night and day. Time to leave my mark on that pretty butt.
Maybe because it was release after three months of holding back? My body heated up, excitement building more than usual.
“Here we go.”
“Yeah.”
I pressed the switch to her ass. The cold wood made it twitch. That little quiver was oddly cute. The ice witch unflinching at surprises, now prepping for a spanking. The gap moe? Sena started looking different.
“Sena, you sure about this?”
“I'm braced for the pain.”
“No, not that. Your servant spanking your ass. As heir to a noble house, is it okay?”
“It's for magic research. If I can't handle this, how will I reach the Realm of Magic?”
Our eyes met as she shot me a look. Hers burned like a knight heading into battle over a mere spanking. Why this kind of courage for something like this?
“And... it's you, so I can take it.”
“Me?”
“Could Grand or Leden really do it properly? Can't ask another male student, either.”
“R-right.”
“I trust you, that's why. Now stop embarrassing me more and spank me.”
Time for some self-reflection. Harboring dirty thoughts about a woman like this? Fine, I'll do it with respect.
Smack! “Hyah!”