Tentacles slowly overtook Nagisa's body. Ritsu, noticing the success of the medical endeavor, let Nagisa go. He fell to the floor, and turned into a ten-foot tentacle monster with a round head. All his clothes shredded and fell off of him. Realizing this, Nagisa became embarrassed and turned pink.
Nakamura and Karma pulled their phones out and started taking pictures.
"Karma, Nakamura, stop it!"
Karma stuck his tongue out. "Make me."
Nagisa sped out of the room at Mach 20 to look for something to wear. He stumbled over his new tentacles a few times, but was mostly unhindered. Nothing will fit me! Except...
Nagisa grabbed Koro Sensei's old robes from the staff room and put them on, then sped back to the classroom.
Okuda was breathing in and out slowly. "All right. That was the most nerve-wracking thing I have done in my life, being captured by the Reaper included."
Takebayashi nodded. "I agree. It took everything I had not to start shaking."
"So Nagisa, you're an octopus now." Terasaka was staring dumbfoundedly.
Nagisa nodded his beach ball of a head.
Okuda began scratching in a notebook. "For some reason, you're blue instead of yellow."
"Maybe it's because my hair was blue?"
Takebayashi shrugged. "Given the fact that tentacle beings can change their skin color, I doubt Nagisa's blueness will have any effect on overall performance."
Okuda nodded. "You're probably right. Now, we need to determine Nagisa's level of ability. We can start by having him attempt things we saw Koro Sensei do, then move to attempting new techniques."
"So, what should I do first?"
Everybody stared at Nagisa.
"Why don't we have you try things in the order we saw Koro Sensei do them?"
Okuda nodded. "That seems wise Karma. So let's make a list of things we saw Koro Sensei do in chronological order."
Takebayashi crossed over to the blackboard and grabbed a piece of chalk.
"Alright, what's the first thing we saw Koro Sensei do?"
Kurahashi raised her hand.
"Well, the first thing we saw him do was change color. He had those green stripes when he introduced himself, remember? Then we saw him regenerate when he demonstrated the anti-sensei BBs."
Takebayashi nodded and wrote on the blackboard.
"The next thing we saw was him flying to Sichuan China for Mapo Tofu. So I guess that would count as flying?"
"Thank you Kataoka. What came next?"
Sugino tossed a baseball up and caught it. "Next he shed his skin to save Nagisa from the bomb Terasaka made him deliver."
Everybody glared at Terasaka.
"Hey, I've grown! I'd never do that now."
Class 3-E continued glaring.
"Can we just move on from the whole suicide bombing thing? I've said I'm sorry."
"Fine. What's next?"
Class E had a solid list of fourteen abilities written down quickly.
"First up we need to test your ability to change color." Okuda whipped out another, larger notebook.
"I'll record results. Nagisa, whenever you're ready."
Nagisa willed himself to change color. His new tentacles went from blue to yellow.
Karma smirked. "You seem to have your color pretty much under control. But can you maintain that control?"
Karma revealed a photo of Nagisa in a red skirt. Nagisa went pink.
"I wonder..." Takebayashi mused.
Okuda finished taking notes with a jab of her pencil. "What is it Takebayashi?"
"Nagisa seems to react to situations similarly to how Koro Sensei did. I have to wonder if it means Nagisa will share his weaknesses?"
Okuda assumed a contemplative expression. "We should test that too. Nagisa, where's the notebook you wrote Koro Sensei's weaknesses in?"
Nagisa's image flickered for a minute. Suddenly, he was holding a notebook.
"You appear to be adjusting to your speed well."
"Not really. It takes up a slew of energy... I'm pretty tired now, and kinda hungry."
Kayano reached into her purse. "Here, I have an energy bar."
Kayano tossed the bar to Nagisa, who caught it with one of his tentacles.
"It's so weird not having opposable thumbs..."
Nagisa tried to unwrap the bar, but his new tentacles weren't built for it.
"I can't open a package anymore..."
Karma pulled out his phone and started filming.
"I suppose this is why Koro Sensei would eat the packaging... Anybody mind helping me out?"
Nagisa handed the bar back to Kayano, who opened it for him.
"Thanks. I suppose I'll have to use scissors from now on..."
Nagisa munched on the bar Kayano had provided as Okuda lectured him.
"Alright, if tentacles feel as weird to you as you claim, you ought to practice moving with them at regular speed. We can't let anybody see you, of course, so you'll have to be either on the mountain or out of sight at all times. Why don't you head outside and get used to you tentacles while Takebayashi and I prep for some tests?"
Nagisa swallowed the last of the bar and nodded. He walked out of the classroom at regular speed, tripping over himself as he did so. Out in the hallway, Nagisa walked as slowly as he could, doing his best to re-learn how to walk.
Nagisa stepped out of the building. He heard movement behind himself. Nagisa turned around to see Kayano and Itona.
"Shall we speak in the shed?" Itona deadpanned.
Nagisa nodded. "Sure, I guess."
Once the group of three reached the shed, Kayano shut the door.
"Are you okay?" Kayano spoke with worry in her voice.
"Yeah, fine."
Itona narrowed his eyes. "We've both had tentacles before. You're either lying or deluded. Which one is it?"
Nagisa shook his head. "I'm really fine. I know you both said having tentacles was excruciatingly painful, but that's not how it feels to me."
Kayano raised an eyebrow. "Alright. But if that changes, talk to us. Hiding the pain won't help."
Nagisa nodded. "You'll be the first to know."
"Also, Nagisa."
"Yes?"
"When the tentacles asked you what you wanted to be, what did you say?"
Nagisa shrugged his non-existent shoulders. "Same thing I said in middle school. I have a target; I won't look away from it now."
"You said teacher?"
Nagisa nodded.
"It appears teacher is the magic answer. Let us know if you need help with anything, ok?"
"Alright. I'm off to get used to my tentacles."
The two ex-tentacle users nodded.
"Don't make the mistakes we did."
Nagisa smiled. "What kind of teacher doesn't learn from those around him?"
With that, Nagisa left. It took about an hour to reach the average human level of coordination with his tentacles. Another hour had him free-running at the level he had previously exhibited.
