Going back in time, Kisuke left Yoruichi and the rest to do his own thing. He went to the center of the training ground where there is a wide clearing.
Kisuke looked around and took out 6 black poles. They are 3 meters tall and 1 inch thick. There are also various inscriptions along its surface which gives it a mysterious feeling.
Kisuke drove the poles to the ground one by one with only 1 meter left on the surface. After he was done, the poles created a hexagonal shape with 3 meters distance from the adjacent poles.
He then went to the center and touched the ground with his palms to release his Reiatsu. Six Reiatsu strands were formed and it traveled through the ground towards the six poles lighting up the inscriptions on it with a blue hue.
From the poles, a line of light ascended 10 meters. Those lines connected to each adjacent line and a thin film of the blue transparent screen on top and in between the lines creating a Hexa-cylindrical barrier.
Kisuke put up this barrier just in case something undesirable happens as it'll stop the shock generated from the inside to the outside surroundings. It was also made so that Yoruichi can power it up with her Reiatsu from the outside essentially trapping him inside the barrier.
"This will do." Kisuke then proceeds to sit cross leg and took out Benihime in her cane form, placing it on his lap.
Closing his eyes, he meditates for 10 minutes to empty his mind before focusing his attention on his energy reserves which are a mixture of his Reiryoku and Mana with Ki on the side not interacting with the two.
Kisuke willed the mixture to stop circulating and pooled it at the center of his body. He inspected it for a while to see anything different from the past but didn't find any changes aside from its volume which increased several folds compared to his childhood. If compared to his Reiryoku in his past life, it's thrice as large, so he can already fully activated the Hougyoku if he wants to, but if compared to Aizen's, it wouldn't even reach half. Although Kisuke will also reach his level eventually as the Hougyoku keeps nourishing his Reiryoku as time goes by in its half-awake state.
Having examined it enough, Kisuke then proceeds to separate it bit by bit. Separating it is like unmixing a mixed paint. So it's almost impossible to do it with an insane amount of control like Kisuke and Yoruichi has. Although they couldn't have mixed it in the first place without that much control to their energy. As he is doing this, Kisuke can feel his physical body weakening with the soul body separating from it.
It took him about three hours to finish the whole process. When he was done, his physical body is just as strong as a Middle-Class Devil, but that is still without using his Ki, although he won't be able to use most of his Shinigami abilities.
He didn't wait for any further and started fusing his Reiryoku and Ki. As he expected, it's a lot easier and less complicated to fuse the two as they are very compatible, though it still needed the same amount of control as before.
Everything is going smoothly. Kisuke even entered a trance state of mind and is automatically completing the task. At this rate, he can completely fuse the two in another three hours, but that didn't happen as he was suddenly pulled to his inner world, although thanks to his trance, his body is still doing the work without his intervention.
Kisuke opened his eyes and immediately saw a familiar Japanese castle. The castle is a flatland castle very similar to Matsumoto Castle in Nagano Prefecture, but instead of the black exterior, it's sporting a blood-red exterior and if it appears in the real world, it would be dub as 'Blood Castle'.
He didn't look at it for long and turned his attention to the surroundings. It still the same, a world with no visible end and in perpetual sunset. The ground is submerged under 3 inches deep crimson water. There are no other features aside from the castle.
Kisuke sighed and spoke out loud, "Benihime-chan, can't you let me do my thing in peace?"
A beautiful voice replied to his query, "This is a good chance. I just can't let it go."
Kisuke turned around and saw a woman with pale white skin, black eyes and hair braided and arranged in loops on her head, wearing a red Kimono with a black sash that compliments her beauty greatly. This is Benihime.
But Kisuke didn't care about her appearance and more interested at what she wants to do, "A chance for what?"
She chuckled and answered his question, "Fufufu. You should already know."
"Want to kill me again?" Kisuke said in an exasperated voice.
"Yep~." And Benihime's smile grew larger. She then took out a sleek, medium-sized sword and slashed it towards Kisuke.
Kisuke parried it with the same sword. They exchange few more sword strikes with sounds of metals clashing so loud that you wouldn't expect it coming from swords striking each other.
On their last clash, both of them fired off a destructive crimson-colored energy blast that created a large explosion sending both of them away from each other. Strangely enough, there was no damage on the ground and the explosion only splashed some amount of crimson water around.
"One of my biggest regrets after unlocking my hollow powers is that you became more unreasonable and radical in your ways." Kisuke adjusted his stance, aiming his blade towards Benihime. Kisuke can't use much of his abilities as although fusing his Reiryoku and Ki doesn't need his full attention, he still needs to dedicate some of it for its completion. As for why he didn't stop the process yet, it's because he would need all of his focus to safely stop or else, his body might just explode and die. But he knew Benihime wouldn't give him a chance to stop.
Kisuke really wished that Benihime won't interfere with the fusing as she didn't do so when the first time he did it.
Kisuke also didn't want to fight her because he can only do so with skills and planning ahead is almost useless as he can't use any items or Kidou. Every time they battle, it's always a close call for him.
"I'll have to thank you for that~. It really feels like I gained freedom." Benihime replied to him happily.