Turning My Junior Sister into a Mary Sue In Xianxia Yuri World

Deep within the Shadowmoon Sword Sect, the dusk painted the skies.

In the rugged mountain wilderness, an elderly man with frosted hair carried a young girl on his shoulder, flying on a sword. They stopped midway up a mountain before the entrance to a cave, marked by a stone tablet engraved with the word “Tomb.”

Inside the cave, faintly visible, countless spiritual swords covered in dust or rust were stabbed into the ground, scattered among white bones, painting a desolate scene.

The girl, Yun Xi, bound tightly with a Immortal Binding Chain, glanced around from her perch on Elder Zhuang Yan’s shoulder. Swallowing hard, she blinked nervously and stammered:

“Senior Zhuang, bringing me here really doesn’t help you much, does it? How about letting me go here? I don’t have a flying sword, so by the time I walk back to Xiri Peak, you’ll be done with your business. I won’t tell the other elders. What do you think…?”

Zhuang Yan chuckled softly and asked, “Since you’re already here, don’t you want to see your brother just once?”

Yun Xi felt an ominous chill at the thought of meeting her brother Yun Kunwu and tremblingly replied:

“I’ve heard Brother Yun is dashing and immensely talented, achieving the Nascent Soul Realm at just thirty years old—a true prodigy of the immortals. But, well, we siblings haven’t seen each other in hundreds of years… Can’t I at least go back and freshen up? Make a good impression on Brother Yun?”

“Don’t worry. Kunwu will like you just as you are,” Zhuang Yan replied with a smile. Without hesitation, he stepped into the cave.

Yun Xi’s expression changed instantly. She struggled and shouted, “Ah! You old fart, Zhuang! Let me down! If I get back home, I’ll tell my father, and he’ll smite you with lightning!”

“Third Young Mistress, you’d have to make it back for that to happen, hehe…”

As the sunlight outside the cave receded, tears welled in Yun Xi’s eyes.

“Sob—Junior Sister Pei! Big Sister! Help meee!”

Yun Xi and Zhuang Yan disappeared into the dim cave, her cries for help muffled by the rocky walls.

After walking through the pitch-black cave for a while, the narrow passage suddenly opened into a wide expanse. Zhuang Yan raised his right hand, and several white spiritual lights flew out from his sleeve, illuminating the space ahead.

They stood at the edge of a cliff, beneath which lay a secluded forest, like a hidden world.

Above, the sky was sealed by rock, blocking any sight of the sun, moon, or stars. The forest below was filled with bizarrely shaped trees growing in tangled chaos. A small river flowed from south to north, cutting through the forest. Most striking of all were the countless damaged spiritual swords embedded in the ground.

The swords were arranged in concentric rings. The closer to the center, the higher the quality of the swords and the greater the cultivation of their former masters. However, even the most modest sword here once belonged to a renowned cultivator who had shaken the celestial realm.

This was Yun Xi’s first time in the Thousand Sword Pool. She was awestruck by the breathtaking spiritual swords surrounding her. Staring at any one of them for too long, she felt as if the sword were whispering its life story and the tales of its master to her in some mysterious language.

Each nick, rust mark, and bloodstain on the sword seemed to tell a story.

Although Yun Xi couldn’t fully understand, vivid images formed in her mind.

The swords seemed alive, carrying their own consciousness, their love and hate, joy and sorrow.

“These swords…”

“Oh?” Zhuang Yan glanced at Yun Xi, whose expression had turned dazed, and asked in surprise, “Can the Third Young Mistress hear these swords speaking?”

“What… does that mean?”

“Your cultivation talent may be mediocre, but your bond with swords is extraordinary,” Zhuang Yan commented as he descended the cliff with her, heading toward the forest’s center. “Still, you’re far inferior to my disciple.”

“… …”

They walked a hundred steps past the scattered spiritual swords until Zhuang Yan stopped before a pitch-black sword devoid of any ornamental tassels. He placed Yun Xi on the ground nearby, then took out a blood-red humanoid figure from his storage bag and laid it next to the sword.

“Kunwu, I’ve kept you waiting. Over the past century, I’ve pleaded countless times with Yun Tianchong to restore your body and release you from the Thousand Sword Pool. Unfortunately, he believes that even if you were freed, you’d remain a disaster. No matter what I say, he won’t agree.”

“… …”

“But in this world of immortals, destiny and talent are everything. Your destiny and talent surpass even those old monsters of the Overclear Sect and the Profound Star Sect. The immortal path is long, and every cultivator dreams of reaching its pinnacle. Sadly, I won’t live to see it, but you will…”

Zhuang Yan, as if resolved, reached out to grasp the sword’s hilt.

At this moment, Yun Xi, who had been eating dirt on the ground, hurriedly turned her head and shouted, “Wait!!”

“Does the Third Young Mistress have something to say?”

“Well, Senior Zhuang, your disciple is about to regain his freedom. Shouldn’t this be a more festive occasion? It’s so gloomy here—how about sprucing it up a bit? Hang some red lanterns, set up a banquet. When Brother Yun comes out, he’ll be happier, right?”

“… …”

Zhuang Yan shot her a disdainful look, then gripped the sword hilt and infused it with spiritual energy.

Streams of azure light flowed from his aged body like streams of water, converging on the sword.

The previously tranquil forest erupted into a tempest. Black baleful energy spread, and the ancient swords embedded in the ground began to tremble and clatter in apparent fear.

Countless sword cries echoed within the mountain.

Clang, clang, clang—

The fierce wind that suddenly whipped up made Yun Xi’s lips peel back, exposing her gums, and even flipped her eyelids outward. She screamed with all her might, but her voice was completely drowned out by the cacophony of sword cries.

Zhuang Yan, who had appeared rather energetic moments ago, aged decades within an instant. His skin crumpled like dried paper. Owing to the boy who had thrown a Water Spirit Pearl into the alchemy furnace earlier, the Demonic pill had not been completed. Zhuang Yan had no choice but to sacrifice his lifespan and Nascent Soul to fill the gaps in the Demonic pill.

“Disciple! Follow my Nascent Soul!”

Amidst the raging winds, the soaring killing intent was guided by Zhuang Yan’s Nascent Soul toward a blood-colored clay figure placed to the side earlier.

The clay figure’s surface began to grow flesh, and in no time, it transformed into a golden-haired youth with alabaster skin, standing bare-chested.

Yun Kunwu slowly opened his eyes, revealing emotionless scarlet pupils. He spat a mist of blood from his mouth before turning to glance coldly at Yun Xi behind him. His gaze brimming with murderous intent caused Yun Xi to hold her breath in terror, even stopping herself from swallowing her saliva.

But then, those scarlet eyes softened, filled with tenderness, as he gently called out:

“Master, you’ve made a grave mistake. Father will never agree to you releasing me.”

Zhuang Yan hesitated, taken aback for a moment. He asked:

“Kunwu, take a look at this girl… Do you believe this is your sister?”

Yun Kunwu raised his eyes slightly, his expression showing faint surprise, though it was hard to discern the reason. He immediately stepped forward, his fingers flicking lightly to untie Yun Xi’s restraints.

“Master, if she is my sister, she’s a descendant of the Shadowmoon Sword Sect. Why would you treat her like this?”

Yun Xi froze, surprised that Yun Kunwu would speak up for her. Yun Yiyi had previously told her that Yun Kunwu had been sealed in the Thousand Sword Pool as punishment for a grave crime, yet now he seemed… unexpectedly decent?

Zhuang Yan was also taken aback. He asked:

“Kunwu?”

“When I was young and foolish, I committed a great wrong and was personally imprisoned here by my father to reflect on my mistakes,” Yun Kunwu sighed softly, his tone pensive. “Now that I’m released, it is not my intention. Master, you should go back and present yourself for punishment to my father.”

“…”

Having said this, Yun Kunwu turned to Yun Xi and extended his hand to help her up:

“Sister, you’ve suffered greatly because of me. As your elder brother, I deeply apologize.”

Faced with such sincere remorse, Yun Xi hesitated for a long time before she slowly reached out to take his hand. She stood up weakly and mumbled,

“Thank you?”

“You’re welcome,” Yun Kunwu replied with a smile. He then turned and walked to the pitch-black spiritual sword before them, saying:

“Sister, could you drip two drops of your blood onto this sword hilt?”

“Why? What are you trying to do?”

“This sword carries Father’s blood-sealed prohibition. Without your blood to activate it, my soul cannot return to the sword. As your brother, I hope you can help seal me back into the sword. Would you?”

Yun Xi shrank her neck timidly, looking at her elder brother’s smiling face. For some reason, it reminded her of Junior Sister Pei’s senior brother—particularly in physique and demeanor—making her uneasy.

After a pause, she countered:

“And if I refuse?”

Yun Kunwu was silent for a moment before he smiled:

“Sister, there’s no need to be so tense. Let me prove to you that I am not what you imagine.”

With that, he turned to Zhuang Yan and closed his eyes slightly.

Zhuang Yan frowned in confusion, but in the next instant, despite Yun Kunwu’s body and arms remaining motionless, a flash of black sword light severed Zhuang Yan’s left arm.

Thud—

The arm fell to the ground, splattering blood everywhere.

“Hiss—!” Zhuang Yan gritted his teeth, stepping back and clutching his shoulder, looking at Yun Kunwu in disbelief:

“Kunwu?!”

Yun Kunwu’s eyes showed no trace of sympathy:

“Master, you’ve violated sect rules. Naturally, you must face punishment. As a descendant of the Yun family, it is my duty to act against any threat to the Shadowmoon Sword Sect.”

He then turned back to Yun Xi, his gaze softening again:

“Sister, just two drops of blood are enough to send me back into the sword. Or… do you wish to defy Father’s will and release me now?”

Zhuang Yan knelt on one knee, clutching his bleeding shoulder and gritting his teeth as he said:

“Kunwu, the Sect Master is currently in seclusion, preparing to break through to the Void Return Realm. The Shadowmoon Sword Sect is now under the control of Elder Tian Xing. You don’t have to be so cautious.”

“…”

Hearing this, Yun Kunwu paused briefly, and the gentle smile on his face vanished instantly. He said coldly:

“Master, why didn’t you say so earlier? You’ve wasted my time with this insignificant girl for no reason.”

“Kunwu, how would I know what you’re thinking if you don’t ask?”

“After being my master for so many years, you can’t even read my intentions? You’re quite the failure as a teacher, hahaha…” Yun Kunwu laughed darkly, his twisted expression revealing mockery as he turned toward Yun Xi.

Looking at Yun Xi’s increasingly pale face, his smile grew wider:

“Sister, just forget everything I said earlier. Now that Father is in seclusion, the situation has… changed.”

Hearing this, Yun Xi gasped, her eyes darting toward the black spiritual sword between Yun Kunwu and Zhuang Yan.

Earlier, Yun Kunwu’s hesitation was clearly due to fear of her father. That meant his claim that her blood could seal him back into the sword was likely true.

Realizing this, Yun Xi immediately dashed forward, biting her wrist and letting her blood splash onto the black sword’s hilt.

Seeing this, Yun Kunwu hurriedly reached out to stop her:

“Wait!!”

But blood cannot be blocked by mere hands. As soon as the drops landed on the sword hilt, a surge of dark energy erupted from the sword’s body and rushed toward Yun Kunwu.

Instinctively, Yun Kunwu tried to evade, but the energy caught him, and he let out a pained scream:

“Ahhhhhh!!”

Zhuang Yan stepped forward to help, but the dark energy repelled him as soon as he extended his hand.

Seeing Yun Kunwu writhing in agony, Yun Xi wiped her nose and licked her wounded wrist before laughing:

“Haha—serves you right, idiot! Back into the sword for another few centuries!”

But just as Yun Xi’s triumphant words left her mouth, Yun Kunwu’s screams turned into laughter:

“Ahhh—hahahahaha~”

“???”

Yun Xi was stunned. “What?!”

Beside her, Zhuang Yan’s bewildered expression turned into a knowing smirk:

“Disciple, I brought her here precisely to use her Yun Family bloodline to remove the prohibition on your sword. Why go through such theatrics?”

“Oh, it’s a hobby, Master. After all, your left hand was useless anyway. Cutting it off was no big deal. Hehe…”

As he spoke, Yun Kunwu, now engulfed in black, malevolent energy, turned to Yun Xi. Watching her expression shift from triumph to despair, his smile only deepened.

Yun Xi began backing away, but after a few steps, she felt something poke her from behind. Turning her head, she saw a silver-white spiritual sword. Without thinking, she grabbed the hilt and pulled it out with force.

She had expected the sword to be difficult to draw, but to her surprise, it came free easily. However, her excessive effort caused her to fall backward onto the ground.

Zhuang Yan, clutching his left shoulder, was visibly startled upon seeing this. He stepped forward to deal with Yun Xi, but Yun Kunwu raised a hand to stop him:

“Oh? This is quite unexpected.”

Realizing she might have pulled out a treasure, Yun Xi’s confidence grew. She stood up with the sword in hand, eyeing the two men warily before…

“Damn it! What kind of freak did Father give birth to?!”

She turned and bolted, leaving Yun Kunwu frozen in place for a moment.

After a brief pause, Yun Kunwu shook his head, picked up his black sword, and with a single step, appeared in front of Yun Xi.

Clang—

A flash of sword light. Yun Xi instinctively raised her newly acquired sword, but the force of Yun Kunwu’s attack sent her flying backward. She crashed into another sword embedded in the ground, coughing up blood.

“Cough… damn it…”

Boom—

Just then, the cavern rumbled. Stones fell from above, and the ground shook like a dragon turning over. Yun Kunwu, about to deliver another strike, paused and looked around in confusion.

“Master, what’s happening now?”

“It must be another one of your sisters, leading the elders of the Shadowmoon Sword Sect to forcibly break the restrictions of this forbidden ground and destroy your spirit.”

“What cultivation level are the current elders?”

“The highest is Elder Tian Xing, at the late Nascent Soul Realm.”

“After all these years, Elder Tian Xing is still at the late Nascent Soul Realm?” Yun Kunwu raised an eyebrow, sneering. “I recall he was at the late Nascent Soul Realm when I was first imprisoned here.”

“Disciple, how could any cultivator in the Four Regions match your talent? A Nascent Soul cultivator at thirty years old—you’re the only one.”

Yun Kunwu chuckled, “Indeed, hehe…” He then turned back to Yun Xi, speaking with mock gentleness:

“Sister, what interesting stories have happened over the past century? Tell your brother—hmm… how are you already unconscious? It was just one strike, and I didn’t even use my full strength. How pathetic…”

Yun Xi lay motionless, eyes tightly shut, cursing inwardly:

—Damn it! What the hell is wrong with your strength?! It hurts like hell…

She also prayed:

—Please don’t notice I’m faking it! Junior Sister Pei! Elder Tian Xing! Someone, come save me! Father, what kind of monster did you give birth to?!