The Twins' Laboratory (Ilien & Idrien Ksakru) (4)
The wet, obscene sounds of flesh slapping against flesh filled the room. Puuk…!! Puuk…! Puuk…!
“Kuh…! Kuh…! Kuh…!”
Even though the young Marei was thrusting into her with brutal force, it was nothing like the strangely gentle way he usually pierced her. This was raw, savage, and completely different. Idrien twisted and writhed on the bed in shock and overwhelming sensation, her body jerking upward as if trying to leap away. But with his cock skewering her like a spit, she could only flop up and down helplessly, making wet, meaningless thuds each time she collapsed back onto the mattress.
“I-Idrien?”
“Don’t worry, Marei. Elves don’t break that easily. I’ll teach you plenty today. Whether you’re with Labella or with me, just fuck us hard. Master.”
Master.Master.
Every time Idrien called the boy—who was far smaller than her—by that title, a strange thrill surged through her. The joy that welled up in her chest made her want to chase after him, calling him Master all the time. But her proud dignity wouldn’t allow it. Still, this push-and-pull wasn’t bad. After all, she was the first. Maintaining their relationship so it wouldn’t grow stale felt like a decent strategy. Of course, she suspected she would eventually end up on all fours like her sister, desperately crying out “Master, Master,” but even that could be something to look forward to when the time came.
“Alright, let’s properly train this bitch~.”
Idrien, pressed tightly against Marei’s back, grabbed Ilien’s hips as if she had dreamed of this moment for a very long time and lifted her up without hesitation.
Tzueuk…!
The massive cock buried deep inside didn’t even have time to adjust to the sudden change in position. It remained rock-hard, exactly where it was. The outline of the enormous penis was clearly visible bulging against Ilien’s lower belly.
“Khh… Here it comes… Here comes the cock… It’s heeeere…!”
Following her training, Ilien instinctively cried out, squeezing her eyes shut as she panted from the violent pleasure.
“Huu… Ngh… Khh…!”
Instead of the usual gentle squeeze, the rough repositioning caused the fleshy walls to belatedly clamp down, twisting and wringing his cock with savage hunger. Yet from the depths of her core, those same rippling folds clung tightly, offering a pleasure so intense it felt like his penis might melt and become one with her.
“Now, say it quickly. Thank me for giving you this dirty cock, you filthy sow!”
Watching her sister get fucked with only her lower body lifted, Idrien spoke harshly, as if she herself were the one brutally violating her own older sister.
“Haa… Uuu… Th-thank you… for giving me your cock… Khh… Uuung…!”
“Hehe, is she squeezing you tight, Marei? Hmm? Is big sister’s pussy gripping you hard?”
Jjiguk, jjiguk, jjiguk, jjiguk. Tak, tak, tak, tak.
Idrien gripped Ilien’s pelvis however she pleased, shaking it back and forth while thrusting her own hips from behind the young boy she controlled. The sensation of fucking her own sister made clear juices begin to trickle steadily from Idrien’s slit.
“What about her body temperature? Is it warm inside?”
“Hng… Yesss… Ilien’s pussy is so warm… Ngh… Uuht… It’s all thick and sticky with her juices… I love how it squirms and wriggles…”
Jjiguk, tak. Jjiguk, tak. Jjiguk, tak. Jjiguk.
Idrien’s soft body pushed forward from behind with the cock, while Ilien’s delicious hole was yanked forward from the front. Marei simply had to stay still and enjoy the supreme pleasure the twin sisters were serving him.
“Haa… Aang… It’s so rough… Hng… M-Masterrr… Uuht… Uaang… Ngh… Huuuht… Kk… Kihi… Huuuuaaaang…!”
As Ilien thrashed and shook her entire body, her massive breasts—large enough to be called enormous milk tanks—bounced wildly up and down, slapping together with loud tak-tak-tak sounds.
“You’re so, so beautiful, sister. Really. Cry louder for me. I’ll stuff you even harder.”
The thought of being fucked by her Master’s cock, combined with the fantasy of ravaging her sister herself, made Idrien yank her sister’s body even more violently while pushing the boy forward.
Jjiguk-taak! Jjiguk-taak! Jjiguk-taak! Jjiguk-taaa! Jjiguk-taak!
“Kk… Kk… Huuuht… Ngh…!!”
The enormous penis slammed all the way to the entrance of her womb, followed by the relentless impacts from behind. Ilien clenched her teeth, desperately trying to endure the overwhelming surge of sensation—whether it was pain or pleasure, she could no longer tell.
“Don’t hold back, sister. Cry like a proper sow while you’re getting pounded, okay?”
Idrien suddenly released Ilien’s hips, grabbed her slender arms instead, and began fucking her older sister even more savagely.
“Khh… Uuht… Ngh… Aang… Aaaang… Ang… Ha, hahit… Hihit… Hit… Hiiiiit…!”
Her breasts, squeezed together by her arms, bounced up and down in shorter, heavier motions, producing an endless stream of wet slapping sounds. Her pure white naked body was already glistening with sweat, shining brilliantly under the sunlight slipping through the window.
“Hahaha. Sister, you really look like a pig. Hehe, I’ll pamper you even more. I’ll rub this cock all over your sloppy pussy…!”
Idrien’s laughter was thick with sticky possessiveness. It was so viscous and obsessive that it sent shivers down the spine of both the pleasure-seeking young boy and Ilien, who was being violated by her own younger sister.
“Khh… Ilien, I think… I’m about to cum… Uung…”
“Hold it. I’ll take care of it slowly. For now, suck on sister’s tits hard. I’ll do the same.”
Marei had been ready to ejaculate immediately, but Idrien’s domineering attitude—pressed fully against him and allowing no objections—made him sigh softly. He slowly brought his mouth to Ilien’s massive breasts.
“Uht… Uht… Ah— Ah—ah—… Uuht… Ngh… My nipples… You’re biting my nipples… Huuaang… If you lick them… Uuht… Ah, you shouldn’t… It feels too good… Huuuht…!”
Tzueup. Tzueup. Haljjak. Tzureureup. Tzueup. Jjalgeun, tzueup. Tzueup. Haljjak.
Under the skillful caresses of both her beloved Master and her younger sister, Ilien began to tremble violently, her smooth lower belly quivering. Through the pressed flesh, she could feel the thin layer of muscle. The heat radiating from their aroused bodies was so high that sticky sweat continuously formed where their skin met and scattered everywhere.
“Okay, okay, Marei. Feeling better now? Then shall we go straight for it?”
Idrien, unable to hold back against her sister’s burning hot body any longer, lifted Marei up on her own and immediately grabbed Ilien’s arms roughly, slamming her hips forward.
“Huuht… Uht… Uht… W-wait…! Just a second… I-Idrien… Uuht… Uung. Haat, haaaat…!”
“How can you say ‘wait’ when you’re crying so cutely like this, sister? I’m going to fuck you all day long. So grit your teeth. Marei, say the same thing.”
Tak. Tak. Tak. Tak. Tak.
The sound of flesh colliding echoed without pause. The brutal rhythm and the frantic hip movements right before climax continued. Marei panted pathetically and repeated exactly what Idrien ordered.
“Uht… Uht… Ilien, I’m going to fuck you all day long. So squeeze me tight… really tight…!”
“Y-yeeess… Huuuht…! Fill my belly… stuff it full, please… Huaaang… Fill my belly… Uuuht…!”
The temperature of Ilien’s body was completely different from when she had spoken earlier. Idrien used Marei even more aggressively, forcing her sister to lie beneath her and make broken kkeok-kkeok sounds. With one eye closed and the other half-lidded, Idrien watched her older sister being shaken relentlessly on the bed by her younger sister’s savage movements.
Her enormous breasts didn’t just bounce—they left afterimages as they shook in the opposite direction of the pistoning, flinging droplets of sweat in every direction. Her lips parted unconsciously, revealing white teeth, while sticky saliva clung between her tongue and teeth, exposing an incredibly lewd, bare face to her younger sister.
“Hahaha, sister, you’re the best. You’re really crying like this? Hmm? You get to see this every day? Faster, faster, move even faster. Okay? Hurry…!”
Jjiguk jjiguk jjigeuk jjiguk jjiguk jjiguk!
Rather than simply enjoying it, Marei began slamming his hips with frantic speed, chanting “faster, faster” without pause. In fact, Idrien’s pace of violently lifting her waist to drive the boy’s cock into her sister’s cunt was slightly slower.
“Uaat… At. At. Ahiiiit… M-Master… Uht… Uuht… If you thrust so deep… Uht… Uht… Huuuht…!”
Idrien shook her hips even harder. Her thick pubic hair naturally brushed against his buttocks, and the sticky nectar flowing down dirtied the boy’s back. But Marei, driven by madness and rushing forward with all his strength, couldn’t even register that luxurious sensation.
“What a spoiled little pussy that keeps begging for cock. Right, Marei? Big sister’s cunt is such a naughty, whining hole, isn’t it?”
At Idrien’s words, Marei nodded instinctively. He simply pounded away on impulse, completely entranced as he fucked the elf teacher whose face was twisted in climax, her arms held captive by her own younger sister. Her huge, almost explosively swollen breasts shook violently, lifting her slender chin before slamming back down with recoil as she gasped.
“Marei, Marei, a little more, more, more quickly. Yes, as fast as you can…!”
“Uuht… I will… Let go of your hands…!”
At her young Master’s command, Idrien instinctively released her grip. The sight that greeted her was like a wild beast that had endured its mating season for far too long and was now exploding all at once. Her older sister’s waist arched like a bow, chest thrust out prominently, head thrown back toward the ceiling in abandon.
“A-amazing… Huaaaat… My pussy… My pussy… My womb… My womb is breaking… breaking apart… Aaaaaaat!!”
Unable to endure the pleasure any longer, Ilien began screaming even louder, tears clinging heavily to her eyes.
“Ahit… Hiiiiiiit. More… Deeeeper… Deeper inside… Hng… Inside my womb too… My pussy too… Please keep fucking meeee… Huuuuaaaaang!!”
Even as he relentlessly stabbed and ground against her cervix and the inside of her vagina, her walls only tightened further instead of loosening, eagerly pleasing her Master.
Tak tak tak tak tak tak!!
Every time he slammed his hips and brutally crushed her womb entrance, her massive breasts shook violently, scattering thick beads of sweat and saliva across the bed. Unable to hold back any longer, Idrien quickly crawled up the bed, shoved her tongue into her panting sister’s mouth, and poured her own saliva inside. She then swallowed her sister’s saliva in turn.
“Hehe, sister, you’re too cute. So lovable. Look at me, sister. Hehe, look at me… Now, tell Master quickly. Who do you belong to? Hmm?”
“Uuht… Idrien… Uung… I-I am… Master’s… exclusive cock sleeve… Hiiit… I am Marei-nim’s exclusive pussy… Aaaang…”
How nice it would have been if her own name had been called instead of Marei’s. Idrien felt her chest tremble with emotion, yet she was still deeply satisfied with the current situation. After all, the boy happily ravaging her sister on top of her was hers too. And if her sister belonged to the boy, then she belonged to Idrien as well.
“Kk… Kk… Ilien… It feels like your womb is sucking me in… Uuht… So good…!”
“Th-thank you… Ilien, Master’s exclusive pussy, is a stupid cunt that only thinks about Master’s cock. Aah, it feels good, too good… Huuuht… Aaaat…!”
The bumpy, ridged texture at the entrance of her womb brushed against the tip of his cock, sweetly urging him to cum. Marei, experiencing this sensation for the first time, couldn’t even breathe properly as he continued to brutally fuck the inside of Ilien’s cunt.
“Aah, auht… Inside… Inside… Your cock is swelling… Huuuht… Master… Kkhung… You’re going to cum, right? Hauuht… You’re about to cum, aren’t you… Huang… Ang, aaaang, ang, ang.”
“Why is it twitching and wriggling inside? Sister. How does it feel? The sensation of your womb being violated? Hmm?”
Watching the endlessly coupled older sister and young boy, Idrien couldn’t hold back anymore. She stroked her own slit while continuously licking and tasting her sister’s lips.
The sight of the identical twin sisters licking each other’s faces while panting pushed Marei over the edge. His climax surged violently. And when her cervix finally softened and welcomed him perfectly—
Puuk.
Ah.
Marei opened his mouth at the long-awaited sensation and, without hesitation, poured his cum straight into the young, talented elf teacher’s womb.
Pyuup… Pyuuput…!
“Uht… Uht… It’s coming… It’s coming out…!”
Only after he had twitched and spurted several times in silence did he belatedly inform Ilien that he was cumming.
“In my belly… Huuuht… Uht… M-Masterrr…”
“I can see it squirming in your belly. So this is what it looks like from the outside…”
Idrien, who had never experienced a proper threesome while fully conscious, calmly observed her sister’s state and swallowed dryly several times. The massive cock bulging against Ilien’s abdomen was visibly throbbing and pulsing.
Tzueuuuk… Tzueuk… Tzueuk…!
“Idrien, I want to cum inside you too…”
“Ahaha. You really are the best, Marei. You just filled sister’s womb and now you want to fill mine too?”
Idrien rubbed her own arms in disbelief, savoring the thrilling shiver for a moment before turning and presenting her ass to the young boy. Beneath her lay Ilien, so it looked as if four holes were lined up in a neat row.
Tzureureuk… Tzp… Tzueuk… Ppup…!
When he pulled his cock out, it came free with a wet ppup sound. Thick globs of semen flew through the air, dirtying Idrien’s back as she waited on all fours like a bitch in heat, ready to be bred.