I'm About to Die, Can't I Buff My Junior Sister's Strength?

[A prodigy senior brother + a relentlessly hardworking junior sister + invincible + satisfying story] I, Shen Nian, am the chief of the ninth mountain of the Heavenly Sword Sect, and I come from the ancient Shen family. I am a prodigy with terrifying strength. I should have been invincible and dominated all ages, but the system says that my fate is over and I will die at the hands of the demon race in three days. Who can accept this? There’s no other way then. I can only give my junior sisters hundreds of millions of power points so they can fight with all their might. Xiao Qing’er, who had just begun her training, fell into deep thought as her senior brother issued the task of slaying a Golden Core stage demon... ”Senior brother, I’m only at the fourth level of Qi Condensation!” Second Junior Sister, born with supreme talent: ”It’s not that Senior Brother has high standards, it’s just that I’m too weak. This supreme bone can’t grow on its own!” Junior Sister Undying Sword Body: ”Senior Brother said that not having a high enough cultivation level doesn’t mean you can’t comprehend it. I will definitely become a Sword Immortal in three months!” After that day, the style of the story changed drastically, and the demon race was stunned. ”I’m a Golden Core cultivator, how dare you, a mere Qi Condensation cultivator, do this?” ”Help! The Supreme Bone can’t grow slowly, you insist on forcing it to the death?” ”This one is even more impressive, capable of taking a sword and finishing it off...” Years later, the Heavenly Demon Realm attacked. A figure in white descended from the stars, and his junior sisters behind him, seeing the Demon Emperors, were not intimidated at all and drew their swords to fight! ”Senior brother! Let me do it!” The human army was completely stunned by this scene. ”No, your senior brothers are already invincible, do you still need to fight so hard?” In reality, the junior sisters of Destiny all had unspeakable grievances. ”It’s not that we wanted to, it’s just that the intensity of what our senior brother was doing was just too high. We had to risk our lives!”