Nagisa stepped into the classroom and froze.
"What... What's going on here?"

In front of the teacher's desk, Nakamura, Okuda and Fuwa were sitting around a certain red haired person who was laying there unconcious.
Terasaka, Itona, Kayano, Kanzaki and Sugino were watching them from the back of the room, mostly with a terrified expression.

"Oi... What on earth has happened to Karma-kun?" Nagisa asked worriedly.
"I-it was my fault!" screamed Okuda. "I asked him to get me the microscope from the closet..."
"... And this guy was playing with his toy tank..." continued Terasaka, pointing at Itona.
Who confessed next:
"...the battery of the controller must have run out..."
"...so it didn't stop and hit Karma's ankle and he fell down." finished Nakamura and added with a serious expression: "Well, his condition looks quite bad."

Nagisa looked terrified.
"T-then why aren't you doing anything? Where's Koro-sensei?"
Terasaka shrugged his shoulder.
"Probably flying somewhere over the Pacific ocean."
"And Karasuma-sensei or Bitch-sensei?"
"Probably out somewhere."

Nagisa freaked out.
"How can you be so calm when he might... Argh, I don't even know how it happened, someone do something already!"

The others looked at each other.
"Nah, he might need CPR, but we can't really perform mouth-to-mouth ventillation..." said Nakamura with an embarrassed face.

Okuda didn't want to butt in, still she couldn't help but do so, almost screaming:
"A-actually, chest compression is more effective...! B-but first you need to make sure his breathing has stopped...!"

Nagisa looked at the others. Seeing Nakamura's encouraging look (after she had sent a cutting glance towards the braided haired girl), he nervously leaned over Karma's face, ears near the boy's mouth to feel the air coming out, eyes looking at the chest to see it rise and fall, three fingers on the carotis artery to feel the pulse. Exactly as he could remember from first-aid course.

It was only a moment, but perfectly enough for Karma to open his eyes and pull Nagisa down.
This sudden interaction made the blue haired boy so shocked that he didn't move an inch.

"Ah, Karma-kun, you're alright!" And then something crossed his mind. "Or could it be that you actually tricked me?"

The others exchanged panicked looks and it was all Nagisa needed to realize the situation.
He wanted to leave the all-too-well breathing Karma, but the boy was keeping him in a tight embrace.
"Let me go! It's not funny at all!"

"That's right, it's not funny." said Itona. "Even though my acting was perfect."
"What, you couldn't even split out a whole sentence!" yelled Terasaka.

Rio crossed her arms.
"I'm disappointed, Karma."
"So am I." joined Fuwa. "This kind of situation always ends with a passionate kiss!"
"Or at least with a successful mouth-to-mouth ventillation!"

Nagisa snapped, pushing himself up a bit.
"Really? Then here you are and leave me alone!"

He took a deep breath, quickly opened Karma's mouth (who actually let him), and annoyedly leaned down to do something like blowing air in.
As if Karma would let him.
He pushed his lips to Nagisa's so hard that the air left through the blue haired boy's nose instead.
The ventillation attempt turned into a sort of heated kiss as Karma forced Nagisa's mouth to open. Then he added his tounge, trying to make his prey respond.

Everyone in the room was looking the well covert make-out scene with widened eyes.
Then Okuda almost fainted, Nakamura started taking photos, Fuwa began fantasising about a forbidden love story, Terasaka and Itona quickly turned away, Kayano screamed, Sugino covered Kanzaki's eyes with one hand and then his own with the other.

Soon Nagisa processed the situation and decided to win this battle.
As he was trying to find the right angle to attack, he was unconciously moving his hips up and down a bit, brushing Karma's groin with his own.
If they had been alone, Karma would've moaned, but under these circumstances he only let out a sigh.

When they parted, he whispered:
"That's not fair, Nagisa-kun, you're making me want to keep you all to myself."
He tightened his grip on Nagisa's pretty waist in order to stay in that position.
Despite the blue haired boy's escaping attempt as he was pushing himself up as much as he could, Karma leaned for another kiss.

That was the moment a yellow-black flash landed in the classroom.

Koro-sensei, along with everyone, stood frozen for half a second (which is rather long considering his Mach-20 speed) and before he could say anything, Karma quickly came to the rescue.
"Heey sensei~ Nakamura asked Nagisa-kun to teach her resuscitation and I helped him."
"Y-yeah, because... I remembered Nagisa was good at it." joined Nakamura immediately.

A circle appeared on Koro sensei's face.
"Teaching your fellow students, that's magnificient!" Then an 'x' followed. "But Karma-kun, Nagisa-kun, get up from the floor, you might catch a cold."
And he went to the back of the classroom.
"Ah, Kayano-san, I got the limited edition pudding you asked for!"

Nagisa lifted his head.
Noticing it, Kayano got embarrassed and started creating excuses.
"N-Nagisa, I didn't take part in it, I j-just mentioned how much I wanted that pudding and they told Koro sensei!" Realizing she might have overcomplicated it, she put her hands on her mouth. "Or could it be that you weren't thinking anything like that and I messed it up...?"
She couldn't escape the glances of Nakamura and Fuwa.

Nagisa suddenly stood up with an angry face, and it caused Karma to sit up to hide the evidence of their previous make-out scene.

"So you really were making fun of me and had sent Koro sensei away deliberately, right?" Nagisa clenched his fists. "I hope you all enjoyed it, because now..."
Everyone was looking at him.
"Now what?"
Nagisa went silent.
"Well..."

Karma used the situation to quickly stand up, covering himself with his arms.

"... Anyway, it was evil and I'm leaving...!" finished Nagisa and ran out of the classroom.

Everyone stared at the red haired boy with a kind of suspicious look.
"What, you suggested it, I just offered my help!" He said, pointing at Nakamura.
"But I didn't suggest anything like kissing him till he can't breathe!"

Fuwa prevented the further argument by stepping forward with trembling fists and a fired up expression:
"Geez, what are you waiting for, you fucked-up Romeo, go after him already!"

Karma actually did as he had been told.