[NOT CONTINUED] Once Upon A Blue - A Nagisa Shiota x Reader fanfiction

Nagisa's POV

I watched Y/N as she entered the classroom with Kayano and Kanzaki. Not too long after she entered, Karma approached me by ruffling my hair. "Hey, what have you two been up to last night?" He asked.

"Nothing. She just came by to help me in the house." I quickly looked away as I answered. Karma looked at me as if i'm lying to him. "Aww..come on Nagisa-kun! What have you two been up to?" He smirked.

I rubbed the back of my neck. "Okay, she stayed at my house last night." Karma nodded and puts both of his hand in his pocket.

"And then?"

"And then what?"

"Did you both sleep together? You told me your mother was ill." 

How badly does Akabane wants the details? God damnit. "How much more information do you need to know Karma?" I huffed.

He laughed and points at Y/N, "You see that face? She's been blushing for the last 2 minutes! And would you look at that, she's wearing your uniform." I blushed, not being able to answer anything he asked.

"Look, Nagisa-kun. You're one of the best assassins in the class, and you can't tell a few details about what you did last night?" He bent down, holding my shoulder.

I looked down on the cracked wooden floor. Thinking of the previous assassination attempts I have done. Takaoka, Kayano's tentacles, The Reaper, the assassin who nearly killed mother, Korosensei's grenade, and the one when we were fighting.

He's right. But still, he was invading Y/N's and my privacy. 

I sighed, "Fine, I can't tell you specific details but I'll tell you the main points." He nodded. 

"She stayed at my house last night, I kissed her, we slept together, I borrowed her my uniform, and there. We're official." I shrugged.

Karma's eyes widened and blushed a little. "Y-you did what?" 

"Yeah, I did all that."

"But you didn't do..." He made a gesture with his finger if we did intercourse. You know, hole and index finger.

"No."

Karma let out a relief sigh, he then smirked and whispered something in my ear. "It's bound to happen in the future Nagisa." 

I blushed a darker shade of red and walked away from him.

TIMESKIP - YOUR POV

6th period was math. The subject where a lot of students have no interest in, which I kind of agreed to. I scratched my head, stares at the paper, tries to relax, and even banged my head on the table a few times.

Still no use.

I sighed and laid my head on the table, looking out the window. We only have about 2 months to assassinate Korosensei. Assassination, that's all I could think about. The cresent moon, the play between students and teachers, and assassins and target.

"You need help there, Y/N Shiota?" Karma offered with his self-confident attitude. "Yeah. And newsflash, it's not Shiota. It's L/N." I answered, annoyed by his tease.

Karma looked at me in a straight face then moved his chair right next to me. He leaned a little close to me and with a deep tone he replied, "I'm sure it'll change one day. One. Day. I am shipping you both and there's nothing you could do about it." 

I stared at him in disgust- not because he ships me with Nagisa, But the way he express it, sent chills throughout my whole body. "O...kay...One question though, are you going to help me or what?" I asked. He smiled brightly and starts helping me with the math problem.

"Oh, and Y/N-chan?" He suddenly whispered.

"Hm?" I answered, not looking at him. 

"I know you're dating Nagisa." 

My heart skipped a beat. Nagisa must've told him, how nice. I put on a smug face and slowly turned my head, facing Karma.

"Why yes, I am dating him." I calmly replied. 

"Okay then!" He puts his signature smirk on his face, "Then I guess you wouldn't have a problem if I told you that I knew you guys were making out."

He leaned closer to my ear and whispered,

"I..n..b..e..d." 

I slapped him across his face, hard enough to make him fall out of his chair. Karma's head appearantly hit the table. The sound was pretty loud that everyone was staring at us. Especially Nagisa.

I quickly stood up and hands Korosensei the math worksheet. As I walked back to my seat, Karma glared at me for what I did. "What the hell was that for? Is that how you repay me?"

I smiled brightly and answered, "Why of course! Thank you for helping me, and that's what you get for invading other's privacy." 

Karma smiled and cursed under his breath. Karma has received his own Karma.