Corrupted by the Malicious Junior Sister

Su Yu, the revered Holy Maiden of Xuan Yu Zong, is imprisoned in the damp, dark dungeon of the Demon Palace. She is bound by silver chains to a stone bed, her sacred robes torn and her body marked by years of captivity. Youli, once her beloved junior sister Qingli from the Clear Sound Pavilion, now the Holy Maiden of the Demon Path, visits her. Youli’s eyes are tinged with demonic crimson, and her demeanor is a mixture of seductive cruelty and deep-seated pain. She reveals that Su Yu missed the trial and execution of Qingli three years ago due to seclusion, leaving Qingli to fall into the demonic path alone. Youli forces Su Yu to drink "Love’s Entanglement," a vicious Gu poison that creates a physiological dependence on the poisoner, threatening to execute Su Yu’s entire sect if she refuses.

As the poison takes effect, Su Yu experiences intense physical torment and psychological erosion. Youli provides temporary relief through "Cold Marrow Dew" but ensures Su Yu remains aware of her degradation. The narrative flashes back to their childhood at Qing Yin Pavilion, where Qingli was a lively, carefree girl who depended entirely on Su Yu. The bond was shattered when Qingli was corrupted by demonic energy while saving Su Yu in the Black Abyss. Su Yu, unaware of the severity of Qingli’s suffering, had searched for her for years, only to find a demoness stained with blood. Youli’s actions are driven by a twisted desire for companionship and revenge; she wants Su Yu to witness the destruction of everything she holds dear, ensuring Su Yu has nowhere to return to but her side.

Youli forces Su Yu to watch through a water mirror as the Demon Path besieges and destroys Xuan Yu Zong. Su Yu witnesses the death of her sect leader, her junior sister, and the burning of her home. This event shatters Su Yu’s faith and identity as the Sheng Nu. Youli uses this trauma to isolate Su Yu further, claiming that the righteous path has abandoned them both and that only they remain for each other. Su Yu’s resistance crumbles as the Gu poison intensifies, creating a physical craving for Youli’s touch. She is forced to beg for relief, leading to intimate encounters that blur the lines between torture and twisted affection.

Despite her physical submission, Su Yu discovers a faint glimmer of her Dao Foundation remains intact within her dantian. Remembering her master’s teachings about guarding one’s true heart, she realizes that outward submission does not mean inner defeat. She resolves to endure Youli’s torment not to break, but to survive and find a way to save Qingli’s soul from the demonic corruption. Su Yu shifts her strategy from resistance to observation, seeking to understand Youli’s weaknesses and the nature of the Gu poison. She accepts the humiliating clothes and the physical dependence, using them as a mask to hide her lingering resolve.

The story moves toward a complex psychological struggle where Su Yu must navigate her hatred for Youli’s actions and her lingering love for the sister she once knew. Youli, despite her cruelty, shows moments of vulnerability and genuine pain, revealing that her goal is not merely destruction but a desperate attempt to keep Su Yu from leaving her. As Su Yu’s cultivation begins to stir beneath the poison’s influence, she prepares to challenge Youli’s control from within, aiming to break the cycle of hatred and find a path to redemption for both of them. The dungeon becomes a battleground of wills, where survival depends on maintaining one’s identity amidst overwhelming darkness.