Chapter 249 Interlude: Mashiro’s Experiment (Masturbation & Yuri Edition)*
Edited by: Kanaa-senpai
I, Kagaya Mashiro, am what one might call an information seeker¹. Consequently, academics have never been a burden; they are a delight. The act of learning and uncovering the unknown is intrinsically fascinating. When I share this sentiment, people usually tell me, “Finding studying ‘fun’ is just plain weird.”
It wasn’t a conscious effort, but I’ve always been at the top of my class. I simply studied to sate my intellectual curiosity. My hunger for knowledge knows no bounds. I have been teleported to another world – or more accurately, summoned – and I am desperate to understand the mechanics behind it. It isn’t that I want to return home; I simply need to know.
Recently, My Master, Sasaki Natsumi, issued a command: “Do not climax for anyone but me, and do not get pregnant.” I initially assumed he meant I shouldn’t sleep with other men, but the reality is far more absolute. Apparently, even if I try with someone else, I won’t reach the peak, nor will I conceive. Supposedly, this applies even to self-pleasure – in other words, m**urbation.
I decided to test the validity of this claim. Narumi-san² received the same order, and I’ve heard that she truly cannot find release with anyone but him. I don’t believe she’s lying, but I won’t be satisfied until I’ve confirmed it myself. Besides, there might be a loophole to reaching that peak without him.
”Nn… fu… uu…”
A thick, feverish breath escaped me. My body flushed, and a dull, throbbing ache settled in my lower abdomen. An empty vial sat on the table. It had contained an aphrodisiac of my own making. Its effects: induced fever and heightened sensitivity, with a virility boost for men as a side effect. My constant experimentation with medicine had granted me the Compounding skill³, and this was one of its fruits. For the record, it’s legal. It’s non-addictive and perfectly wholesome – mostly.
Of course, illegal versions do exist, but they can’t be crafted through normal means. They are the products of a certain Unique Skill⁴; they are so addictive and potent that once a person tastes them, even the most frigid prude or pure maiden would spread her legs and beg for more. Unfortunately, the person manufacturing them is currently missing, so they’ve vanished from the market. Any remaining stock is traded at exorbitant prices.
I happen to have some, though.
I bought them before the prices spiked. I had no intention of using them, but I figured I might eventually test them on myself just to document the efficacy.
Regardless, my body was primed. I began the experiment. Still in my chair, I started toying with my breasts. My n**ipss grew hard and erect.
”Nn… hah! Nn…”
Pinching them sent a faint, electric jolt through me. Thanks to the drug, I was feeling everything more intensely than usual. Without it, it would take much longer to reach this state, but I suppose I should expect nothing less from my own brew.
While my left hand teased my breasts, my right hand hiked up my skirt, reaching for my heat. I slid my hand inside my panties and began to work my clitoris.
”Hah! H-ah, ngh… it feels… so good… nn, kfuun…”
Perhaps I overdid the stimulation. My clitoris was stiff, and as I rolled it between my fingers, the sensation was incredible. I could feel my own slickness overflowing from my slit. My skirt was damp, the moisture soaking into the chair beneath me. I traced my middle finger along the seam and pushed it inside. It slid home without a hint of resistance.
Squish, squelch.
”Hi – ah, a, an, aahn! Ha, hiin! Nn, k-kfuun, an, an!”
I lightly scratched the sensitive nub deep inside with my fingernail.
”Kuhiiiiiin!”
The G-spot. My body pulled taut at the single touch. This was my weak point. If I focused here, I should reach the end in no time. I didn’t hesitate. I stimulated the spot over and over.
”Ah, ah! Aa! Aahn! I’m going! I’m going! I’m going, going, going! I’m – wait, what?”
The wave of the climax hit a wall. It didn’t recede; it just stopped right at the brink. My body told me one more touch would do it. I gave myself one more sharp flick.
”Haguuun! Why? It feels so good, I’m right there, but I can’t go! I’m c**ming – no, I can’t! I can’t! Ah, haun! Aahn!”
It was useless. No matter what I did, I couldn’t cross the finish line. I was suspended in a state of permanent edging, unable to progress. The pleasure was there, but this was pure, slow torture. I stood up and began to grind my crotch against the armrest of the chair.
”Kuha, an! Even this isn’t working!? Ah, no, my hips won’t stop! An, an!”
Contrary to my will, my body began to grind on its own. I wanted to c**m but couldn’t, and the pleasure was so intense I couldn’t stop.
”I want to go, I want to go! I want to, but I can’t! It feels too good to stop! Aahn! Kuun! Hahiin! I… I still have more to test! Haa, haa, ahyun…”
I managed to force myself to stop and stumbled over to the bed. I had confirmed that normal m**urbation wouldn’t work, even using the furniture. I’ve never cursed my own lewdness as much as I did in that moment.
I stripped off my clothes. It was too late to save them, but I didn’t want to soil anything else. I pulled a rod-shaped object from my Item Box⁵. It was a replica of a male organ – a ddo. Furthermore, it was identical in girth, length, and shape to My Master’s. I had made a mold with his permission to craft it.
I inserted the ddo. Because I was already so slick, it slid in easily.
”If I use this… something the exact same size… surely I can… nhaahn! An!”
Fantasizing about s*x with My Master, I began to thrust the ddo violently.
Wet, rhythmic friction.
”Mas…ter… My Master, more, deeper! Ah, an! Incredible! With this, I’m going to – I’m not!? Even with this!? An! My hands won’t stop! An-an-an!”
Even that failed. I pulled out another and inserted it into my anus, which had been opened to him before.
”Ohiiiiin! Both of them… being violated by My Master at the same time! This is – this is amazing! Master! My Master! It’s good! I’m c**ming! It feels too gooo – I can’t go! Even this is no good!? But I can’t stooop! An! Ahin! Ohi! Hahii!”
No matter how I struggled, I could not reach a climax. Not through m**urbation, not through the furniture, and not through the replica of My Master’s p**is. The pleasure remained constant, and the frustrated desire to reach the peak only intensified. I couldn’t stop.
At this rate, I wouldn’t be able to think. And I had one final thing I wanted to test. I couldn’t afford to lose myself to pleasure just yet. Keeping the ddo inside me, I threw on nothing but my cloak and left the room.
* * *
I knocked on the door of my target. Based on the schedule, she wouldn’t be with My Master today; it should have been Himezaki-san’s turn.
”Coming~”
A voice called out as the door opened. She was shorter than me, with absurdly large breasts. Despite being the same s*x, I found her incredibly cute, yet her clothing was always unnecessarily erotic. It was Narumi-san.
”Oh, Mashiro-san? What’s wrong? …Wait, your face is bright red! Are you okay? Do you have a fever?” Narumi asked, her eyes wide with worry.
I certainly had a fever, but it wasn’t a cold.
”I’m fine. I haven’t caught a cold. I just have some business with you… or rather, I need your cooperation,” I said.
”Oh? I don’t mind helping, but… what do I need to do?” Narumi asked.
”Yes, thank you. Could you let me in first?” I replied.
Narumi-san agreed and invited me inside. I had imagined her room would be a cute, warm-colored space – basically, a pink room – but it was surprisingly plain. However, the sheer number of erotic outfits was staggering. There was the maid uniform she was wearing now, which left her back completely bare, see-through babydolls, and things that were barely more than strings. Judging by this, her actual underwear was likely quite substantial as well (I would later find out during “girl talk” sessions that she owned low-rise striped panties and open-crotch lingerie).
Narumi-san was far too different from how she was before the summoning – mainly in the “erotic” department. But that only made it easier to ask her.
”So, what did you need?” Narumi asked.
”Fufu, this,” I said, leaning in.
I approached Narumi-san, leaned down to her eye level, and kissed her. Her eyes went wide in shock. A wet, stifled sound escaped as our lips met.
”Nn!? Nnnnnn!?” Narumi let out a muffled cry. “P-pah! Wait, Mashiro-san, what are you doing all of a sud – nnnnn!?”
She struggled to push me away, but I ignored her, pulling her close and deepening the kiss. I slid my tongue inside, entwining it with hers. I thought she would resist more, but she began to lick back as if in response.
Deep, messy sounds of a wet kiss.
”You say ‘stop,’ but you aren’t exactly resisting,” I whispered.
”That’s… just a reflex… nn… hafuu…” Narumi breathed.
Narumi-san was completely melted by the kiss. I pushed her down onto the bed. Her pained eyes and flushed face were so endearing they made even another woman’s heart flutter.
”Haa, haa… Mashiro-san, was this your business with me?” Narumi asked weakly.
”Yes. To be precise, I want to see if I can climax through lesbian s*x – specifically between two girls who have both sworn servitude to My Master. I need you for the experiment,” I explained.
”I… I can’t do that…” Narumi-san shook her head.
She continued to refuse. In that case, I had no choice. I would use my secret weapon: the ultra-potent aphrodisiac. It was dangerous, but I had to see what would happen. I pulled out the small vial, drank half, and then, holding the rest in my mouth, I leaned down to feed it to Narumi-san through a kiss.
”Nnn!? Nn, gulp… nn, ah, aaah… what did you make me drink? Ah, hah, it’s hot, my body is so hot… I… I feel strange…” Narumi cried out.
The effects were instantaneous. Narumi-san’s breath turned ragged as she lolled her tongue out with hungry eyes. Her gaze was wet; you could tell at a glance she was in Heat⁶. And for that matter, so was I.
”Haa… this… is unreal… it’s on a whole ‘nother level from normal aphrodisiacs… haa, so hot… I want it… Narumi-saaan…”
My tongue is starting to trip over itself. I see—no wonder this stuff is illegal. The potency is too high. But that actually works in my favor. I cast off the cloak I’d been wearing, stripping down until I’m practically naked, save for my socks and shoes.
”Mashiro-hyan… you came here… wearin’ that?” Narumi-san slurred. “You’re such a per-bert…”
”Per-bert? Pervert? Yeah… I’m a total per-bert,” I replied. “Ufufu… Narumi-shan… you are too, aren’t youuu?”
I won’t let her say otherwise. Not when she owns so many clothes like that. I pull Narumi-san’s maid uniform aside at the cleavage, baring her breasts. They’re big. So big and lewd. Actually, I can’t think about anything except lewd things anymore. My reason is completely gone.
”Big boobies… even though you’re so tin-ny…”
”Don’t call me tin-ny!” Narumi-san snapped, pouting.
A sulking Narumi-san is just too cute. I pin her down, and we lose ourselves in kisses and embrace. Just rubbing our n**ipss together feels incredible.
”Hyaun! Ah, nooo! It feels too goooood!” Narumi-san cried out. “Even though we’re both gi-rls… anh! Hyaun!”
”Me too… it feels so goooood! A-aan!” I moaned in response.
A jolt like electricity surges through me just from our n**ipss grazing. My sensitivity has spiked way beyond what I imagined.
”Anh… Mashiro-shan… that thing… stickin’ out…”
”It’s a ddo… the same size as My Master’s… ufufu,” I whispered. “Since we’re here, I’ll give you a little taste…”
I slowly draw the ddo out from where it was nested in my v**ina and guide it toward Narumi-san’s rear.
”Hahii! It’s bi-ig! It’s the same shape as Master’s!” Narumi-san wailed. “Anh! My butt… it feels so good! My hips… my hips won’t stop!”
I slide the ddo into Narumi-san’s anus. I had my suspicions, but clearly, this place has been well-traversed. In fact, she’s probably used to doing this daily, given how her hips are already rhythmic and bucking.
”Aah! No, nooo! It feels good, but I can’t… I can’t reach!” Narumi-san screamed. “Anh! Ahi, an-an-an!”
”Panting Narumi-hyan is so lewd and cute,” I said. “Nfufu… let’s feel good together… and let’s cross the edge together, okay?”
I grind my v**ina against Narumi-san’s. Our clitorises collide; it was already a sensitive spot, but with the aphrodisiac in our systems, the pleasure is off the charts.
”Aan! An-an-an! This is it! It feels so good!” I yelled. “My p**sy is making such squelchy noises! The juices are gushing out… does it feel good? Does Narumi-hyan feel good?”
”Hyan! Anh! Aan! It feels good, but no, I can’t, I can’t get there!” Narumi-san sobbed. “An-an-an! Ahyan!”
Narumi-san’s face is a total mess of tears, drool, and snot. Though I’m sure I’m making much the same face right now.
Squelch-squelch-squelch-squelch!
Slop-slop-slop-slop!
The sound of our genitals mashing together mixes with the wet, lewd splashes of our Love-juice⁷ water-sounds, echoing through the room. It feels good—so good I can’t even remember why I came here. But it feels so amazing it doesn’t even matter.
”A-a-a, I’m going, going-going, going-going-going—I caaan’t!” Narumi-san shrieked. “I can’t, I can’t reach! Why?! Whyyyy?!”
”Aaaaaaaaaah!” I howled. “It fee-wls too goooood… but I can’t cuuuuum! I can’t, I can’t get there! It fee-wls good, but I can’t! It fee-wls good but I can’t cuuuuuuum!”
I remembered. I was experimenting to see if we could reach climax. But…
”It’s good, gooo-goo-good! I can’t c**m but it fee-wls so good, I’m gonna get addicted to this!” I cried out. “Anh, an-an-an! More, make me feel even more, Narumi-hyan, Narumi-hyaaaaaan!”
”An-an-an! Mashiro-hyan, nooo!” Narumi-san begged. “No-no-no, nooo! The good feeling won’t stop! It’s just gonna keep going forever! Aan! I’m not reaching! He-help, help me, Master! Anh! Ahin! An-an! Hahiiin!”
Forgotten experiments aside, we did nothing but continue to gorge ourselves on pure, unadulterated pleasure.
* * *
”Honoka was taking forever so I came to fetch her… what the hell are you two doing?” My Master asked.
”Mashteeer, mashteeer! The good feeling won’t stop and I can’t get there, it fee-wls so goooood!” I blubbered.
”Aaan! Master! He-help, help me!” Narumi-san pleaded. “I wanna cuuum! Let me reach it!”
The next morning, my lesbian tryst with Narumi-san dragged on until My Master arrived. It goes without saying that shortly after, he brought us both to a screaming climax using nothing but a single finger.
* * *
RESULT REPORT
In the end, it was proven that no matter how we struggled, we were incapable of reaching a climax unless it was provided by My Master. However, the orgasm achieved after such a long period of edging was deep and prolonged—to the point of being potentially addictive. In the future, I intend to build up a “reservoir” via m**urbation prior to attending to My Master.
SUPPLEMENT
As punishment, My Master forced me to m**urbate while watching him have s*x with Narumi-san. Furthermore, he refused to let me reach my own climax. I have fallen into the quagmire of non-climax, and while it is becoming a habit… to think I would simply be left ignored like that. Incomprehensible.
—
Summary:
Kagaya Mashiro tests a command from her Master, Sasaki Natsumi, which prevents her from climaxing with anyone else. After failing to find release through m**urbation and ddos, she visits Narumi-san to attempt a ‘yuri’ experiment. To bypass Narumi’s resistance and her own mental block, Mashiro uses a highly potent aphrodisiac.
Mashiro uses an illegal, potent aphrodisiac on herself and Narumi-san to experiment with pleasure. They engage in intense s*xual activity but find themselves trapped on the edge of climax, unable to cross over. The next morning, their Master arrives and easily brings them to orgasm, proving that only he can grant them release.
—
Trivia:
- Mashiro has a ‘Compounding’ skill from her scientific background.
- The ‘Unique Skill’ aphrodisiacs are rare due to the producer being missing.
- Narumi is described as having a wardrobe entirely composed of erotic gear.
- Himezaki-san is currently the one on ‘duty’ with Natsumi according to the shift.
- Mashiro left her room wearing only a cloak while still having a ddo inserted.
- Mashiro was wearing a cloak over her naked body (except socks/shoes).
- Narumi-san is a regular maid who is used to anal play.
- The aphrodisiac used is specifically noted as being illegal due to its strength.
- A character named Honoka was the catalyst for the Master finding them.
- The Master can trigger their orgasms with just a finger
—
Character Insight:
Mashiro’s intellectual curiosity overrides her sense of shame, as she is willing to experiment on her own body and her allies’ to test the boundaries of her Master’s magic. Narumi displays a submissive ‘conditioned reflex’ to Mashiro’s advances, suggesting the extent of their conditioning.
Mashiro shows a scientific, yet submissive curiosity regarding her own body’s limits. Narumi-san displays a high level of conditioning to their Master’s s*xual preferences.
—
Behind the Scenes:
The author notes that this interlude was delayed past Christmas. The chapter emphasizes ‘clinical’ s*xual experimentation common in ‘isekai’ light novels with ‘cheat’ mechanics.
The author uses a ‘non-climax’ trope (orgasm denial) to emphasize the Master’s absolute s*xual control over the characters.
—
TL Notes:
Notes:
• Mashiro – Rank one student, beautiful but cold and detached, high mana capacity.
• Kagaya – Female student from Earth. Specialized in sorcery and information gathering. Obsessed with knowledge and has mastered the local language through self-study. Yamato Hina’s classmate. A sorcery specialist who uses a staff. Capable of ‘Fire Wall’ and ‘Aqua Spread’. Has purple hair.
• Natsumi – The protagonist. Height 168 to 171 cm, weight 57 to 59 kg. He has a baby face, but he hides his eyes with his bangs. He was bullied by the Sugita gang just because his name sounded like a girl’s name.
• Sasaki – The protagonist, 168–171 cm and 57–59 kg, with a baby face hidden by black bangs. Once bullied and thought dead by the Sugita gang, he now fights as the gladiator Seven. Wielder of Snatch and Time Compression, he’s the hidden source of many curses and a shapeshifter. Dressed in green scale armor with a blood‑red muffler, he wields dual longswords.
• Narumi – Narumi Honoka. A member of the relief team with healing magic. Despite her cute, short, ‘transistor glamour’ appearance, she is cold-hearted and mocks Sasaki. Black hair, black eyes.
• Himezaki – Himezaki Rieslett. A half-Japanese, half-Swedish girl with a youthful appearance. Often mistaken for her mother’s sister. A blonde or brunette girl. Currently wearing a black cloak over a white shirt, accented with a red ribbon tie. A navy-blue, knee-length pleated skirt, black knee-highs, and brown leather shoes.
• Honoka – Petite, cute “transistor‑glamour” girl with high‑level healing magic, built like a tiny bomb of lewdness and huge breasts. Started as a cold‑hearted slave mocking Sasaki, then flipped into full devoted “Goshujin‑sama” maid mode, obsessed with his scent and desperate to bear his child. Used to be Hidaka’s obsession, later violated by Sugita, which left her furious and tightly protective of the protagonist. Bashful smiles, but the second anything touches him she goes nuclear. Usually in a sleazy maid outfit, the anti‑aesthetic to Lotte and Nadja’s clean uniforms.
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Edited by Kanaa-senpai.
Thanks for reading.
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