At the time of training for Crystal and Tobi, Koba showed them how they should hide their bond so as to avoid unnecessary attention from potential threats,
This would help them in their journey in Tokishiki, having to meet any enemies that might slow them down is not a good thing, especially for Tobi, Crystal doesn't have much time left and the brothers are closer to getting a hold of Koba and if they were to catch him and fight him, if they win, that would spell disaster.
"Wake up children, "
Koba walks in the air to meet where Tobi and Crystal were fast asleep, "In my domain, you dare sleep?"
Tobi slowly opens his eyes to shut it immediately because of how bright Koba was, "Are you the sun? why are you so bright?" Tobi said as he was rubbing his eyes, he sat on floor on his instep,he turns to Crystal who was still fast asleep, he gently rubs her head as if nudging her to wake up,
"Sis, sis, it's time to wake up"
"Give me five more minutes..." Crystal said as she turns her back against Tobi and Koba,
"Sister... but we have to train..." Tobi said in a soft voice as he became incredibly worried, a worried expression appeared on his face,
"... train alone..." Crystal stops listening and adjust her side sleeping position to be comfortable on the transparent glass cube floor,
"Sis..."
"Leave her alone, when she's ready she'll come train with you"
Koba and Tobi walk away from Crystal and head to the other side of the cube where they start the lesson,
To hide the scent of an Ackerman many methods can be done, some use potions like the psychopathic brothers, others use blood oats with their masters, some use fire as a way to hide their scent by tattooing over their original mark and lastly the use of fire crystals were used.
"To hide your scent I'm going to put a fire crystal inside of you" Koba opened up his palm and there was a small crystal no bigger than a pinky finger floating and rotating clockwise and anticlockwise, it had a very pointed tip at the opposite directions, glowing in three different shades of orange, at the core of the crystal the it glowed bright yellow,
"Woah... pretty..." Tobi said as he looked closely at the crystal, drawn to the beauty of the crystal Tobi draws near until the image of the crystal reflected perfectly on his green iris, Tobi slowly reaches out to touch it the tip of the crystal and touches it "Ouch! it's pretty but nasty... just like sis..." Tobi said to himself as he rubbed his index finger against his thumb in pain,
"So, where are you going to put it?" Tobi looked up at Koba, "Anywhere, but it's up to you to chose where you want to put it"
"Wait, how are you going to put in me? cause that thing is sharp" Tobi said as he touched the crystal's pointy edge again this time it poked him and a small amount of blood drip from hand and slides down the curve of the fiery crystal and touches the floor
"Don't put dirt in my domain young boy, just tell me where you want the crystal to be don't worry about how I'm going to put it in you" Koba said with two fingers pressed against his temple almost in annoyance.
"Uhmm... l don't know? put it anywhere" Tobi said with an innocent look on his face, he looks back at Crystal who was still sound asleep and then whispers to Koba with one palm covering the corners of his mouth,
"I'm going to wake her up"
"Boy focus on the training"
"...you know what?"
"What is it this time?" Koba refrains himself from yelling and politely asks,
"I want sis to decide where the crystal goes, she's my caretaker after all"
"fine, go wake her up"
Tobi walks over to Crystal, her blonde hair was all over her face making it hard for Tobi to see that she was glaring at him,
"Sis-"
Bam! Crystal stood up immediately and hit Tobi forehead against hers causing him to fall in shock, she rose up and stood tall over him and when Tobi could regain his consciousness he places his palm on his fore head to realize there was blood flowing down on his face,
Before he had the chance to cry or yell Crystal pointed her finger at him yelled at him.
"How many times have I told you to not wake me up?!!! Uhn Answer me! Don't wake me up when I don't want to be awake!"
"sis..."
"Don't *sis...* Me!" Crystal said with a disgusted voice, "Gosh, the only thing I regret about bringing you with me is the fact that you're to clingy, grow up Tobi, I'm not going to be with you forever you know"
There was a moment of pause between the two siblings as the last sentence echoed through the domain, Crystal notices the words that wanted to come out of Tobi's mouth but he held himself back,
He let out a small sigh and smiled at her, with the purest chuckle she had ever heard come out from him, "...pfft... hahaha"
"Huh? it's not funny!" Crystal lifted an eyebrow at Tobi's laughter, but Tobi countinued to laugh
"Sister, I'm going to spend the time I have with you to the fullest,"
" I'm never going to miss a second of living with you, even when you fall in love or get married or even when I fall in love and get married, I'm never going to miss a chance of spending my time with you"
"What..."
Tobi stands up in front of Crystal, his curls had gotten longer, the blood on his face had dried up and his eyes turned bright green almost lemon in colour, "I love you sister," "that's why, I love my sister so much seeing her angry makes me happy, I feel like a child again"
Crystal stunned by his reaction could only express a weird smile on her face, Koba looked at the two with agitation holding his anger in,
"Just tell me where to put the crystal you brats!"
"crystal? what crystal?" Crystal asked
Tobi then explained to her what the crystal is and why Koba wants to put it inside of them before the start their journey in Tokishiki.
"Isn't that going to hurt, I mean it looks very sharp" Crystal said and Tobi nodded in agreement showing her his index finger,
"Just tell me where to put it "
Crystal looked at Tobi and place her fingers against her chin, she examines him from top to bottom and then she opens her eyes wide open and points a finger in the air as if to have a good idea.
"His back! that's where his tattoo is!" Crystal grabs Tobi in suprise and puts him on the ground with his arms held down by her,
"Sister! W... Wh...what are you doing?! stop my arms are hurting! Sister! you're going to break my arms!" Tobi yelled as he tried to squirm and wiggled on the floor in pain, Koba came over to the two clicked his fingers then the fire crystal appeared again, floating and rotating around with radiance and beauty.
"Pull his shirt"
"Okay!"
"Wait!"
Crystal and Koba paused and looked at Tobi in frustration,
"...Is it painful?..."
"..."
"Yes"
Tobi tried to get out of Crystal but she was too strong, Koba placed the crystal above Tobi's back there it floated and rotated, Koba waved his hand over the crystal causing it to stop rotating around and float still, his hands were right about the crystal as he tapped the tip of the crystal and just like clock work the crystal stabbed the spine of Tobi right at the curved part of his spine.
"Ahhhh! sister! it hurts! it hurts! it hurts!"
Tobi let out a scream for help.
"Hold it in Tobi it'll be over soon!" Crystal yelled back at him, she looked at Koba with a worried expression and to ask if he was going to be done
"...Yeah this might take a while..."
"How long?!!"
"sixty seconds..."
"Sixty?!!!"
"His bond with you is too strong, if you want a permanent coverage of your scent the crystal needs to break that bond and absorb it"
Tobi hearing all of this screamed even louder trying to get up but unable to, he called Crystal so many times to let him go, tried hitting his head against something but nothing worked, the pain from the absorption of the bond was too great for him to endure,
After a minute of the excruciating pain Tobi passes out and the crystal finally absorbed the bond and stuck itself in Tobi's skin almost as if there was no skin covering the crystal, then the color of the crystal began to change from different shades of orange to green a dark green color.
"It changed color..." Crystal whispers to herself.
"Your brother is very special... make sure to treat him right" Koba said as he laid his hands to reduce the pain in Tobi's back"Special?... what do you mean?"
"Only divines change the color of my crystals, his color is really dark a sign of a very powerful divine, another god must have put something in him"
"there are other gods apart from you?"
"yes, and it seems your brother has caught one of their eyes, make sure to take good care of him before he's taken away"
"Taken away?"
"child... don't worry about it, now where do you want me to put this crystal?" Koba said as he made another fire crystal appear on his palm,
"on my shoulder where my mark is..."
Crystal rolls up her white sleeves and Koba releases the crystal towards Crystal's arm, there with one wave he does the same and the crystal punctures Crystal's arm and immediately absorbs her bond,
"that hurt for a bit tho..."
"Yeah it's because you're the strongest Ackerman alive "
...
After an hour, Tobi finally wakes up and sees Crystal and Koba discussing, "Aren't they supposed to be training?" He said to himself and walked over to the two,
"oh, you're awake? well it's time to train then" Koba clasped his hands and then his entire domain changed it's shape to form a combat room.
"Woah" Tobi was mesmerized by the beautiful landscape of the room,
"We're going to training here?" Crystal asks almost in disbelief
"Yes, for the Next Two Weeks you are going to be training here"