It's My Turn on Master's Cock
Yoo Jua remembered how Rienna had desperately tried to get close to her while Han Jin-seong was away. At first, she'd been at a loss, hesitating and fumbling, but then she'd recall the mission Han Jin-seong had personally assigned her and approach with a resolute expression. Yoo Jua, who'd listened attentively to her stories—nodding along out of sheer terror that showing any dislike might get her sliced up—vaguely thought that maybe this elf wasn't as bad as she'd imagined.
Emboldened by Yoo Jua's genuine focus, her attentive listening, and enthusiastic responses, Rienna got excited and spilled her tales with glee. Among them were stories of human-elf wars that made Yoo Jua wonder, Is this for real...? But she didn't pay it much mind. It had nothing to do with her! The distrust and back-and-forth over truths piled up between humans and elves felt stale by now. Even those self-proclaimed eminent historians bickered endlessly about elf-related history, split right down the middle. Humans started it? No, the elves threw the first punch. Watching that mess, she'd learned it was best to just tune it out.
It was a precious chance to hear the truth of history straight from an elf's mouth—something everyone was dying to know—but with her house burned to ash alongside 32 years of debt, Yoo Jua's heart ached too much for that shit to matter. What do I care about some truth that'll make scholars clutch their necks? She'd think dismissively.
Anyway, realizing this elf wasn't so bad after all, Yoo Jua chatted amiably with her, trash-talking Han Jin-seong with gusto. Sure, there weren't many other topics to share with a stranger like an elf, but damn, she just wanted to vent about him too.
“......Don’t you think so?! Sis. This guy's a total fucking bastard, right?!”
“Ahaha… Master does have that side to him.”
As Yoo Jua ranted like she was filing a formal complaint about Han Jin-seong's outrageous villainy and violent tendencies, Rienna smiled benevolently, nodding in full understanding. After all, Rienna had been abruptly kidnapped by him and had her asshole broken in first thing— she could empathize with Yoo Jua's feelings a hundredfold.
Sis and little sis... By age, Rienna the elf was overwhelmingly older, so Yoo Jua naturally started calling her "sis." For Rienna, it evoked thoughts of her little sister back in Elvenheim—not a bad feeling at all.
As their backbiting girls' talk dragged on, Rienna glanced at Yoo Jua, thinking of their master who still hadn't returned after half a day. They'd run out of things to say, settling into an awkward, bored silence. That's when Rienna's eyes landed on the trashy maid outfit Yoo Jua was wearing.
Rienna could handle it fine with her magic and elven constitution, but to her eyes, little sis Jua was a total normie with zero connection to this rugged life. And surviving in this hideout wearing just that? It looked freezing. No heating, and temperatures plummeted exponentially at night.
“Jua little sis, let's go buy some clothes.”
“Huh?”
Yoo Jua, who had snuck into the city center with Rienna—both hooded up—and returned, felt grateful toward her. Sure, part of it was fear at this monster's stamina: carrying her and sprinting two hours' walk each way in just one hour round trip. But she hadn't expected such consideration, doubling her感动.
Ah! Even if the sky falls, there's always a hole to crawl out of. Yoo Jua was thrilled to find someone (an elf!) she could rely on in a place like this, her fondness growing by the minute.
But!
“Now it's my turn, so get off. Hurry up.”
That was that, and this was this. No matter what, she couldn't forgive hogging their cock all to herself. Staring at sis's belly, bloated like she'd gotten pregnant from one creampie, Yoo Jua asserted herself more fiercely than usual.
Back when she didn't know Rienna's personality and they weren't close, she'd cowered. But not now. Realizing she could push back a bit, Yoo Jua turned into a room-corner warlord and shoved sis's ass away with both hands—still clamped on master's cock.
“W-Wait, Jua little sis…! Kyaaak?!”
Sluuuuurp—♥ Pop—♥
“Hiiikyaat—♥♥?!”
Pushed by Yoo Jua, Rienna's pussy forcibly released the cock. Her inner walls clung desperately, but it popped free with a clear squelch, sending her into another orgasm as she buried her face in Han Jin-seong's shoulder.
“J-Jua little sis… you… ♥”
Rienna tried to scold her through orgasmic gasps. Her gaping pussy started dribbling out the packed cum—
“Hya!”
Squiiiish—
“Haaang… ♥♥!!”
But Yoo Jua had already grabbed the ultra-powerful vibe Han Jin-seong had made, shoving it in like a plug with a cute grunt. It sealed straight to her womb entrance, blocking the leak—but the shock triggered yet another wombgasm. Rienna, who'd endured nonstop uterine climaxes till now, finally lost consciousness.
“Huh? Sis?”
Not expecting her to pass out, Yoo Jua panicked briefly, then her eyes curved slyly, half-lidded.
“Hehe… Cocky~ ♥ Now Jua will take care of you…?”
She slyly climbed atop him like Rienna had, settling into cowgirl.

“Haha!”
Han Jin-seong, who'd watched it all, burst into cheerful laughter without scolding them. Females competing over a strong male was natural since ancient times. As long as it didn't turn vicious and stayed this fun, he welcomed it anytime.
Yoo Jua lifted her hips, slipping a hand between to grip the still rock-hard cock proudly erect. By now, it had shifted from Rienna-mode to suit her—reeking of thick, smegma-heavy dick cheese from his Mutation.
“Hngh♥ This dick cheese smell… haaa… ♥!”
Yoo Jua grimaced at the stench yet stared down with a slack, slutty face. The white clumps like melted cheese, the foreskin still half-covering the glans unlike before— the dirtiest, nastiest cock in the world... but the one she loved most.
“Y-You naughty dick cheese scraps… ♥ I'll eat every bit with my pussy… ♥!”
That was the unique cock that had tamed her into a bitch. Shoving something that filthy raw inside might cause hygiene issues... but
Of course, Erotic Tattoo Contract is the best.
The contract anticipated even that, built-in as an all-purpose helper. It managed cleanliness to prevent diseases, keeping everything pristine. Of course, Yoo Jua had no clue... Her eyes were already cock-drunk from unwittingly tea-bagging off her new stepsis Rienna—nothing else mattered.
Her thin silk panties were soaked through with pussy juice long ago. She shoved them aside, revealing her plump, ripe-fruit pussy. Pressing the cockhead to her entrance, she rubbed gently.
“Haaa… ♥ Cocky… ♥”
Precum leaking from the partially peeled glans mixed with her juices, creating a slick glide. Bracing on sis's firm white ass cheeks right in front of her face, Yoo Jua slowly lowered her hips.
Squelch—♥
“I-It’s… coming in… ♥ Cocky… inside me… ♥”
Into her pussy, the foreskin packed with nasty cheese slowly peeled back and sank in. Her smooth walls began devouring the filthy shaft. Sticky clumps mixed with her nectar, splattering disgustingly across every nook— an alien, repulsive sensation.
But to Yoo Jua, it was no longer gross. Knowing her insides were being defiled by his marked her with irresistible taboo thrill and arousal.
“C-Cocky… ♥ Feels good…? Yeah… ♥?”
The hefty cock stretched her pussy to tearing, burrowing relentlessly. Hitting her womb entrance with heavy pressure, she trembled and panted.
Squelch—♥ Slurp—♥
“Cocky’s cheese… mixing inside my pussy… ♥ Ahng… ♥ So dirty… ♥ Filthy but… feels so good… ♥! Hear that squelching…? Cocky… ♥”
Pressing harder on sis's soft ass, she began slow hip rolls. Squelch—♥ Bottoming out deep, then lifting up slow. Her walls clung jealously each withdrawal, squeezing greedily. Lewd sounds of her juices and his cheese filled the room.
Like Rienna, she circled her hips and ass to grind it. Spreading the filth across every pussy wrinkle, using the cock as her pillar. Her tattoo glowed hotter pink; each womb-grind sent electric pleasure surging through her body.
Slurp—♥ Squish—♥ Squelch—♥
“Haaang♥ Ah♥ Ah♥ Ang♥ Womb, my womb…! Cocky’s dirty cheese… touching it… ♥! Hngh—♥ My baby chamber… getting soiled by cock cheese… ♥ Ah♥ So, so good♥”
Yoo Jua sped up. Squelches turned to meaty clap-claps; pussy juice streamed down her pale thighs, soaking the sheets.
“My pussy’s your personal cheese dump now… ♥! Haeng♥ Cocky… ♥ Aaang—♥ So happyyy… ♥!”
Shame and depravity from her slutty words mixed with pure ecstasy, wringing obscene honey from her womb. She shook her hips like a maniac, all to satisfy him.