•The Assassin's Teacher• ((Saiki K. x Assassination Classroom Crossover))

Shiro

With Saiki (Limited)

The creature then lunged forward dangerously to the ground.

The once-human creature soon hit the ground and tried to hit Koro-Sensei, but failed as the yellow and more loved tentacled organism dodged the attack from his past student, who was driven to kill his teacher. Koro-Sensei even let out a scared and worried yelp as he nearly dodged the attack, sending him flying back.

But with the sudden pressure on the ground, the students who didn't weigh much all together went flying through the air, Saiki went flying back too, and now the students began to yell in fright of their own life being blasted in front of their very eyes. A few screamed for help from Saiki or Koro-Sensei, a few even began to ask for a heavenly being to help them out in this time of crisis.

Koro-Sensei nor Saiki could do much, as Koro-Sensei blocked the attacks coming from the larger and more powerful teacher, and Saiki had a harder time standing up, but his vital (one of his main priorities) was perfectly intact, and safe for the drinking, from either people who could drink it.

But now, the students were laying or falling towards the ground, from the boom that the mass creature created in the short moment, Shiro seemed to find this horrid event like some sort of city parade that he was taking place at, like his creature that he mutated to not be a human anymore, was some sort of balloon ride.

"That, dear children, was called a sonic boom," he began to explain the creature once again, to the point where if Saiki had the ability to kill him, he would have, "His tentacles have an initial velocity of Mach 20." he paused for a pregnant and dramatic moment of silence. "However...their top speed can get up to Mach 40," he said spine-chillingly, as he saw Koro-Sensei now was having a hard time controlling the creature he once tormented.

"How...How can that even be remotely possible?" Okajima asked, but they all knew that humans with great power, loved to torment the weak for their own personal gain to society, from wealth and riches to connections and fame.

"Haha," Shiro laughed through the booming fight that was breaking out, "In short, his basic performance level is doubled than what your dear teacher Koro-Sensei has The tentacles amplify 2.0's ungodly kinetic vision and intuition." he began to inform his students, "He is readily adaptable to a supersonic world."

Shiro watched the fight calmly, "Unlike some people," he looked at his ex-sister-in-law and the less-talkative student with laughable ease, "He took to his tentacles with ease. He shares that in common with version 1.0."

Shiro hen went quiet, as the students and Saiki turned towards Koro-Sensei, who was getting beaten up by Reaper the second, "Koro-Sensei," Nagisa screamed helplessly, as they saw a spiritless Koro-Sensei get tossed and thrown around like a ragdoll with no human to be played with.

"The most significant difference though is that his tentacles," they began to hear pleads and groans from Koro-Sensei that worried them, "Quite unlike yours and those of the Octopus, were designed for sustained use. He requires upkeep, rendering him effectively disposable."

Saiki was surprised, how a human would rather give a painful death to their target, rather than a swift and clear death, that would both be easier and faster to get the job done, and with a less likely chance that the target that they were given would escape.

"In exchange for being given three months to live," Saiki looked at horror towards the teacher, Saiki wasn't wearing his glasses anymore (Which why would he need to, as well as wearing his clips, they were just unnecessary now) but he wished he still has his powers so he could take off his glasses and solidify the most horrid human on the planet then and there.

"He can tap continuously into unthinkable reservoirs of powers and strength." he paused as his face than faked excitement and awe, "Oh, and did I mention, that his expiration date does not come included with an explosion?" he said excitedly, which began to piss Saiki off with his fake, or clearly insane attitude.

He laughed loudly and in drama, as he heard Koro-Sensei grunt and yell, "The Efficient, deadly, sustainable, and safe!"

Kaede spoke up, as she was close to tears like the rest of them were, "Why do you always feel the need to have to do this?" her ex-in-law looked towards her, "Why do you always have to hurt people, and feel happy about it? You should do your own dirty work for once!" she yelled, but Shiro only smiled savagely towards her.

"You think I'm not willing to?" he asked, as he looked towards the crowd of haters he had, laying eyes on Saiki who was trying his best to stay up with one crutch and shaky ground, he brought out a viral of light and clear blue to his neck. Then shot it in through his system.

Saiki stepped back and tried to cover a few of his students if this crazed man were to attack at the moment, Kaede and Maehara who were in front of the rest of the group had gasped loudly as they saw what he was doing.

"Do you think I'm not prepared to meet with my own demise?" he asked once the needle's liquid was all done and into the circulation in his neck, as his skin turned into a dark purple with his veins as clear as day (during the night) "Come now," he said dangerously "That's very naive of you to think..."

"What did he just do?" Sugaya asked from his distance away from the main event, though he knew what Shiro was doing, he didn't want to believe it, Okuda spoke a soft but worried, 'Oh no'

"I am beyond giving a damn whether I live or die," Shiro said as he looks off his white robe, and was wearing all black underneath, he looked up to the yelling Koro-Sensei while his body turned into unnatural positions.

"Everything I cared for was stolen from me years ago," Saiki heard the crazed Shiro say as he tried moving his students back, but with no avail, as their feet stayed planted to the ground, "I am merely a collection of muscle fibers, joints, nerves; fertile ground for tentacle implantation," he told the group of students, and looked at them like a snake stalking its prey, "--No, an empty temple where God-like powers thrive! Know this, guinea pig!" he shouted out to Koro-Senseias a bright purple light flashed and Koro-Sensei gasped.

"Your death will haunt these children for the rest of their earthly existence!" the bright purple light came from Shiro's missing eye that was covered.

Koro-Sensei screamed in confusion, as the students whimpered in fright.

"Listen to me, class." Koro-Sensei said, "There's something I neglected to mention in my earlier lesson." he said like this was the right time to start taking classes of all moments.

"A clever assassin may avoid confrontation for a while, but sooner or later the fight will come. And when it does, if the target whats to die or not, every last ounce of strength will be put to the test." The Reaper 2.0 pulled back from the fight, as Koro-Sensei was on the ground, gasping as he talked.

"In my case, that would be now!" his smile grew but his eyes look dead.

Saiki looked at Koro-Sensei and wished that the yellow creature they called a teacher lived to see another day.