"I absolutely have to keep this secret for Brother Tenshu!"
Knowing how serious the matter was, Uchiha Yukino made up her mind that she could never reveal it to anyone.
Inside the Genjutsu space, Uchiha Tenshu had no idea what Uchiha Yukino was thinking and simply continued teaching her how to cultivate her spiritual power.
With the Sharingan's transmission and guidance, Uchiha Yukino quickly mastered the method, as though she had practiced it hundreds or thousands of times. She began to wield her own spiritual energy as naturally as her limbs. Yet as she activated that spiritual energy, it was like a frail body trying to bear a thousand-pound weight. Her pale face immediately tightened with strain.
"Now!"
Uchiha Tenshu clenched a Gelel Stone fragment in his left hand while his right rapidly formed one-handed seals. He used his self-created Energy Extraction Technique, and a spherical mass of Chakra instantly formed. Under the powerful effect of that Chakra sphere, the life energy within the Gelel Stone was swiftly wrapped up and extracted as if by magic. From the outside, it looked as though a blue ball of Chakra was continuously filled with green life energy, like a brilliant gemstone.
"And next comes the crucial moment—injecting and sealing the life force! This part isn't difficult."
Uchiha Tenshu moved with practiced ease, as though he had rehearsed it hundreds or thousands of times. He directly injected the life energy into Uchiha Yukino's body like a gentle stream, then firmly sealed it away.
The reason for that was naturally that Uchiha Tenshu had simulated this process hundreds, if not thousands, of times within the Genjutsu space.
As everything came to an end.
Uchiha Yukino continuously sensed her spiritual power in her mind. It seemed she could already control it to a preliminary degree.