I don't talk about love with my Martial Sister

DISCLAIMER: I do not claim ownership over this story. I only MTLed it with AI and polished it.

Link: https://www.jjwxc.net/onebook.php?novelid=5309619

Official Synopsis:

Shang Can transmigrated into the cultivation world as the chief disciple of an immortal cultivation sect. A teenage genius, full of spirit and pride, her life was smooth sailing, and she had never faced any major hardships. Even her beautiful junior sister, whom everyone said had a cold and distant personality, hard to approach, would only show a gentle smile when she saw Shang Can, obediently and sweetly calling her "senior sister."
Shang Can thought it would always be this way, but fate is unpredictable.
Many years later, her junior sister, dressed in white like a celestial being, stood high in the clouds. Her once-beautiful eyes had lost their light, and her usually calm and composed voice trembled slightly as she spoke, word by word, "Senior sister, either you stay, or I will follow you."
Shang Can, now having turned into a demonic cultivator, averted her gaze, unable to look at her.
Shang Can had once loved hearing Yun Duan call her "senior sister." Every time she heard it, she was willing to give her anything, even plucking the stars from the sky for her.
But now, with time having passed and things having changed, hearing those two words again, the heart-wrenching pain had long faded, leaving only a numb, dull ache.
What her junior sister, whom she had loved so deeply, desired the most was something Shang Can could never give her.