Back in Time, to save our teacher( assassination classroom fanfic)

Caught?

The day went on with a few more hiccups. They had training with Karasuma-sensei after Koro-sensei's math class, where Karma had mistakenly, performed a move that they hadn't been taught yet. Everyone passed it off as Karma being Karma but if Karasuma-sensei's periodic glances at them were any indicator, Nagisa knew they weren't in the clear. 

After that, their last class was with Irina-sensei. Nagisa's English was not perfect but he knew that it was more advanced than what it had been at that time. He decided to keep his mouth shut the entire time. The plan almost worked however, Irina-sensei must've sensed his unease and decided to call upon him for one of the last questions. 

"Well Nagisa-chan," she said with a smirk," you seem a bit distracted. Why don't you answer this question?" Using the chalk she pointed at the board.

Nagisa turned his gaze to the board. It was a simple from to past from present conjugation.

"I had several long pens, would be the answer, Irina-sensei," Nagisa said politely. 

There was silence in the room for a moment. Then Irina-sensei rushed towards him and pushed his head into her rather voluptuous breasts. Then she peppered kisses all over his head. 

"Aww!" she squealed. "Does that mean the children are finally are warming up to me and are not calling me with that dreadful nickname!" she yelled into his ear. Nagisa winced.

"What do you mean, Bitch-sensei?" asked Karma with an innocent smile, cocking his head to the left. Nagisa mentally thanked him for the save. Irina-sensei continued to whine at Karma and throw her remaining chalk at him, until Koro-sensei came back in to announce hat the class had ended. Nagisa was thankful for the class having ended, then he remembered that Koro-sensei was waiting outside for him. 

He left the class room, gaining a fist bump from Sugino, in a sign of comradery. He stood opposite Koro-sensei. 

Koro-sensei turned to him and with a smile and said," We need Karma as well." 

Nagisa nodded, trying to remain calm. Why Karma? Did they already blow the entire thing?

Karma walked out last, talking Okuda to about some potion he required.

"Karma-kun, can you please come with Nagisa and me to the staff room," said Koro-sensei. 

Karma nodded, said bye to Okuda and followed us to teachers room. 

Koro-sensei made us wait outside, and told us to come in when we he called us. 

As soon as he left, I turned sharply to Karma, hoping just this once he would listen to me and said," Look at Irina-sensei's smaller mirror."