Magic Practice Requires Nipple Stimulation
That day, Ian wanted to head back into the Labyrinth again, but Arcia put her foot down, forcing him to rest for two days. Still, he wasn't about to just sit around idle. First things first, he needed to get the hang of using the wand.
The two of them decided to try it out in a forest near the city.
"That wand can store the spell formula you want."
The wand was a tool that let you save a spell formula ahead of time, allowing you to cast magic without constructing it from scratch every time.
"But the only formula I know is one—Mana Bolt."
Ian had memorized only Mana Bolt, and even that had taken dozens of repetitions in actual use to stick.
Magic formulas were incredibly intricate. High-circle spells looked like blueprints for some elaborate machine.
"Wanna give it a shot first?"
Arcia held out her hand toward Ian.
"Sure."
Ian carefully placed his hand on hers, then raised the wand with his other hand.
Was it because he could now sense mana? Or maybe because their relationship had grown a little closer? Casting magic felt much smoother now. No nosebleed this time, either.
Whirr.
As the formula completed, one of the three gems embedded in the wand glowed faintly.
"You can use each stored formula three times," Arcia said, holding up three fingers.
"So how do I store it again after that?"
"Just store it the same way you did now."
The wand had a more interesting structure than he'd expected.
"Alright, let's store a different spell next."
"I can't use any other spells, though..."
Ian replied in a shrinking voice.
"It's fine. Big sis will help you. Come here."
Arcia pulled Ian's hand, wrapping her arms around him from behind. The warmth of her soft body against his back eased his mind a little.
"Okay, gather your mana."
Ian followed her lead, channeling mana into the wand.
"Now I'm gonna slowly insert the formula into your body," Arcia whispered softly into his ear. "Just transfer it straight to the wand."
For some reason, it felt like they were drawing even closer, but Ian pushed the thought aside and pulled up his mana.
"Y-yeah..."
His voice trembled slightly.
"Here we go."
With that, Arcia's other hand touched his chest.
"Ngh...!"
A small moan escaped Ian's lips before he could stop it. His body was still hypersensitive from last night.
"Focus."
Arcia began engraving the formula while gently stroking his body. Ian followed her lead, constructing it in the wand.
Slide.
Her fingers, which had been stroking him nonstop, brushed the tip of his nipple.
Twitch.
Ian's body shuddered faintly.
"Hold still."
Her voice rang right next to his ear.
"Hah..."
His breath leaked out softly.
"Your concentration's slipping, huh? Fufu."
Arcia's nail lightly scraped the nipple's tip. That was the finishing blow.
"Ngh...!"
Ian couldn't hold out; his formula crumbled.
"Ah... Arcia..."
He called her name in a pitiful whine.
"It's okay. Let's try again."
Arcia stroked his head as she spoke.
"You're gonna keep touching here?"
Ian pointed at his nipples, now poking prominently through his thin shirt.
Arcia's lips curved into a soft smile, as if she found him adorable.
"That's how you make progress."
Her red eyes looked especially sly today.
"In real combat, you might have to cast under even worse conditions."
She tried to sound serious, but Ian knew exactly how ridiculous that excuse was.
"Come on, again."
As Ian sat there dazed, Arcia urged him on by pushing her mana into his body.
"Ngh!"
The sudden surge made Ian stagger.
"Oh no, stand properly."
Arcia caught his wobbling form from behind, supporting him.
"A-alright."
Under her persistent prodding, Ian had no choice but to move his mana again.
"This time, touch it yourself."
Arcia took his free hand and slowly guided it to his nipple.
"Stimulate the areola with your fingertips like this."
"Ahk...!"
The sensation of his own fingers near the nipple made Ian's body jerk.
"It's fine. I'll handle the other side."
Arcia's finger tapped his other nipple.
"Nngh...!"
The simultaneous sensations from both sides raised goosebumps all over Ian's body.
"Don't stop now. Mirror my movements exactly when I touch you."
"Y-yeah..."
Ian's eyes glazed over dreamily. The formula had collapsed long ago.
"Like this—nail upright."
Scratch.
"Hngh!"
Moans kept spilling from Ian's lips at her touch on his nipple.
"Now, follow big sis's fingers."
"Y-yes..."
"Like this—with your nail... scratch."
"Nnght...!"
Ian mimicked her a beat late.
"Fufu... Good... Now slowly, gently with your fingertips."
Slide. Slide.
In the deserted forest, the faint sound of fingers moving over thin fabric echoed lowly.
"Ha... ha..."
Ian's breathing grew rougher.
"Fufu, all done."
The hand holding his slid toward his crotch.
"I'll take care of down here. Keep playing with your nipples."
"Y-yes..."
Arcia slipped her hand into the bulge in Ian's pants.
Squelch.
He could feel precum leaking from his glans tip.
"Fufut."
Squelch! Squelch!
Arcia smiled lewdly as she moved her hand slowly.
"Ngh... ngh..."
Stroke, stroke.
She didn't stop the hand on his nipple either. Ian followed suit, touching his own.
"Fufu, how's it feel? Good...?"
"N... heh..."
Ian's tongue, utterly slack, couldn't even form proper words.
Arcia's hand sped up. Ian's body convulsed harder in response.
"Ngh... Ah... Arcia..."
Ian desperately called her name, at his limit.
"No. Hold out longer."
"Ah... I can't... No more... Ngh!"
In the end, Ian's body shook violently.
Splurt! Splurt!
The tension he'd been fighting shattered in an instant, draining from his whole body. The front of his pants soaked through with his semen.
After days of built-up fatigue and stimulation, his body was already on the razor's edge of sensitivity.
"Ngh... Nng..."
Ragged breaths kept escaping. Ian couldn't even hold himself up, his shoulders trembling as he panted.
His legs gave out completely, and he slumped to the ground.
"Ian, looks like you can't handle it."
Arcia muttered lowly, grabbing his shoulders and laying him flat on the ground.
"Ah... Wait..."
Ian's eyes quivered faintly.
"Not... here..."
They were deep in the forest near the city—a secluded spot, sure, but anyone could wander by at any moment.
The thought made his breath quicken. He glanced around nervously, tension flooding his body.
"What're you saying now?"
Arcia whispered with a hint of laughter in her voice.
"Stay still."
That short command sank into him unnaturally deep—like soothing words that also pinned him in place, refusing escape.
Arcia roughly stripped away his clothes.
"Arcia... Please... Let's go home..."
"It's fine. No one's coming."
She cooed softly, but her words somehow stirred more anxiety than comfort.
Ian's unease wouldn't settle.
"Please... I'll do it ten times... Just not here..."
His pleading voice was already half-sobbing.
But Arcia didn't stop. She plunged in deeper without hesitation, leaving no room for him to flee.
Ian bit his lip. The sight only spurred her on.
"You're too cute, my sweet Ian."
Arcia inserted him agonizingly slowly, from glans to root, like she was devouring him.
Squeeze.
Her pussy clamped down on his cock, as if determined not to let go.
"Sorry, Ian. Big sis can't hold back anymore."
Slam!
Arcia rocked her hips hard. The sudden rush of sensation made Ian's body quake.
No matter how he tried to endure or tense up, it was futile.
"Eut...!"
A short breath burst out. He hurriedly swallowed the sound, but it was too late.
"Be quiet."
Her voice brushed his ear—low and soft, yet impossible to defy.
"Hngh!"
Ian frantically clamped his hands over his mouth. But he couldn't fully muffle his ragged breaths.
The forest was too quiet. That only amplified his fear.
The thought that someone might hear wouldn't leave his mind. His heart raced faster, his body reacting more acutely.
Then—
Rustle.
A small sound from the bushes beyond.
Both of them froze instantly. Ian's eyes widened in shock.
"S-someone's... there..."
He barely breathed the words in a trembling whisper.
A moment of silence. Arcia slowly lifted her head, scanning around. Wind rustled the leaves between trees, but no sign of life.
"It's fine."
She whispered low.
"No one's here."
"Don't—"
As Ian tried to speak, Arcia's hand covered his mouth first.
"Shh."
His breath scattered hot against her palm. His pupils quivered.
"Quiet."
It soothed even as it held him immobile.
Without giving him a moment's reprieve, Arcia thrust forward again.
"Mmph...!"
Only faint, trembling breaths leaked past her fingers.
Ian instinctively grabbed her wrist, but no strength went into it. Each tremor sent his disrupted breaths spilling under her palm, the forest's silence sharpening them into clarity.
Arcia gazed down at him, slowly curving her lips.
"See?"
She brought her lips close to his ear.
"Don't lose focus, Ian. Concentrate."
Ian couldn't respond. Couldn't even try. Amid the haze clouding his mind, her voice cut through with unnatural clarity.
"Remember this."
Her words sank in slow and deep.
"From now on, when you practice magic..."
His body shuddered faintly.
"You have to do it while touching your nipples."
Her voice was quiet and clear, like engraving the rule into the depths of his mind.
***************
A short distance away, in the bushes. Two blue eyes gleamed quietly through the darkness.