Chapter 411 Sister-in-law After a Long Time ③*
Edited by: Kanaa-senpai
”Ugh, ahhh…! My… my rear, it’s…!”
This was the second round with Flearis, my younger stepsister. I had just inserted the “Anal-Rummaging Grub (Provisional)”¹ into her, and her hips were already bucking in rhythmic spasms as the device began to squirm deep inside her.
”How does the second intensity level feel? It should be moving much more aggressively than the first,” Kento said.
”Hiee…! Ah! Is… is this really okay? My ass… you’re going to ruin me! I won’t be able to use it for anything else!” Flearis cried out.
The device was an anal-focused version of our shop’s new “Wriggle Ddo-Buddy,”² and it lived up to its name by digging relentlessly into her. Even though she should have been used to having foreign objects-and things squirming inside her-thanks to the “Slime-kun Who Dwells in a Woman’s Arse,”³ she seemed overwhelmed by a mix of confusion and mounting heat.
”This is an experiment to find that out,” Kento replied. “I’ve already run tests in the other track, so you’ll be fine. Besides, if anything goes wrong, I’ll make sure to treat you myself. Just relax.”
”I can’t relax! Ah, no, stop! It’s… it’s hitting my womb!”
Flearis was clearly being stimulated from the back. She clung to me with desperate strength, grinding my own “Ddo-Buddy” against her cervix. From the front and back, her womb was being prodded, crushed, and hollowed out.
”Aaaaaahhhhh…!”
She let out a weak, animalistic cry, the sound of a female utterly lost to her own arousal. Hearing that long, keening wail right in my ear sent a shiver of excitement through me, but I forced myself to endure just a little longer.
”Next, let’s try out the ‘Nip-Clit Licker,’”⁴ Kento muttered.
”What… what is that?” Flearis asked breathlessly.
”It’s a miniature version of the ‘Wriggle Ddo-Buddy.’ Basically, I took the motor unit-what I call the ‘Moving Mechanism’-and shrank it down to simulate the motion of a tongue. It’s easier to show you than explain,” Kento said.
I pulled the device from the bedside table. It featured three small, tongue-shaped protrusions set inside a cup. I pressed the switch, and they began to churn and swirl.
”Is… is that it?”
”Yeah. Like this…”
I pressed the device against her. Within the cup, the three tongues began to knead and roll her n**ips from every possible angle. It was one of my better inventions, though Flearis looked conflicted as it worked her over.
”It… it feels like an insect is on me!” she squealed.
”Well, you can’t deny it feels good,” I countered.
”I… I suppose…!”
As we spoke, the “Anal-Rummaging Grub” gave a particularly violent squirm, making her writhe in my arms. This version was still a prototype; I wanted to find a way to fix it in place, but different bodies needed different cups. For now, a harness or strap seemed like the easiest fix. I really needed some rubber to develop a proper suction mechanism.
”Ah, wait! Please… can’t you turn it down just a little?” Flearis pleaded.
”No way. You have to experience this alongside the ‘Licker,’” Kento said firmly.
I poured a bit of lubricant into the cup and pressed it firmly against her other breast.
”Ah! No! My n**ips… it’s going to come off! You’re going to break me!”
”You’ll be fine. Nipples are sturdier than you think,” I said, pinching the opposite side to drive the point home.
A violent spray erupted from her as she reached another peak. She wasn’t even trying to pull away anymore; her hands were locked behind my neck, pulling me closer even as she claimed to be falling apart. She was surrendering completely.
”Let’s get the second ‘Licker’ on you,” I said.
”You’re… you’re so mean to me…” Flearis whispered, her face flushed deep crimson, her eyes hazy with lust.
I set the first device down just long enough to prep the second. Her n**ipss were engorged, slick with nectar and trembling from the cold air.
”Ready?”
”You’re a bully… a tease… I hate you,” she whimpered, though the way her internal muscles were clenching around me told a very different story.
I pressed both devices home at once.
”Hyaaa! Ah! Ahhh!”
She tried to arch her back to escape the sensation, but her own arms held her trapped against me. Our bodies were fused, heat against heat. Between the dual stimulation on her chest, the grub in her rear, and my own length filling her, Flearis was being pushed past her limit.
She was a mess of tears and sweat, her mouth hanging open as she climaxed over and over.
”Say my name,” I commanded, thrusting deeper into the slick heat. “Call me Kento.”
”Ah! Ahhh…!”
”Come on. Say it, Frea.”
”K-Kento… Kento… Sir Kento!”
”Good girl.”
I buried myself deep against her cervix and let go, a long, hot release that filled her completely. Flearis screamed as a final, massive geyser of fluid erupted from her, her body shaking with aftershocks.
I held her limp, trembling form against me, savoring the scent of her sweat and the way she twitched against me.
”Brother… Kento… Brother…?” she murmured softly.
”Call me whatever you like, whenever you like,” I whispered.
She smiled then, a small, predatory thing. She pushed me back onto the bed, pulled the grub from her rear, and didn’t let me go until the sun came up.
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Summary:
Kento tests his latest adult-themed magical inventions on Flearis, his younger stepsister. The session involves multiple experimental items, leading to intense physical reactions and multiple climaxes for Flearis. The encounter concludes with an emotional shift as Kento demands she call him by his name, transitioning their bond beyond familial roles.
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Trivia:
- The ‘Anal-Rummaging Grub’ is still in a provisional/testing phase.
- Flearis is already accustomed to magical internal creatures from a previous item involving a slime.
- Kento is actively thinking about engineering problems like suction and material constraints (rubber) even during s*x.
- Flearis’s initial resistance or ‘hating’ Kento is localized ironic flirtation (tatemae).
- Kento’s name ‘Kento’ is a major point of intimacy compared to ‘Onii-san’
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Character Insight:
Flearis shows a high level of physical endurance and a psychological shift from viewing Kento solely as ‘Big Brother’ to a personal partner. Kento demonstrates his dual nature as a caring partner and a detached researcher/engineer.
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Behind the Scenes:
The author uses specific R18 Isekai tropes where magical technology is used to overcome biological ‘limits’ of pleasure.
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TL Notes:
Notes:
• Flearis – A member of the diplomatic envoy and guard. Has pink hair. Lily’s sister or Martin’s younger foster sister. Has pink hair. Member of the covert unit. Displays a cold, almost vengeful pragmatism when reporting her sister’s words to Martin.
• Kento – The owner of the magic tool shop ‘Harvest,’ which discretely sells adult goods. He’s a former overworked, ordinary salaryman from modern Japan who was suddenly transported (isekai’d) to this fantasy world. He has dark hair and an unremarkable appearance, typically wearing a plain, slightly suspicious-looking shop owner’s clothes looks like Kazuma Satou from certain series. He has a minimal amount of magic power, enough to craft his specialty items.
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Edited by Kanaa-senpai.
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