{ This is a NAJ! NightKiller oneshot BUT made legally which means NAJ! Killer and NAJ! Nightmare would hold back on dating each other and just wait until Killer graduates college for them to be legal and so that NAJ! Nightmare won't commit a crime and go to jail. Killer would be 18 here but by the time he graduates his last year in college, he'd be already 19 by then. Nightmare is currently 24 and would be 25 by the time Killer is 18 and graduates. Oh, and Fresh isn't an UwU softie boy here because ew. Just a normal and your typical class nerd and the almighty quiet kid who will startle the whole school when they decide to fight back against the bullies (in this case, he'll put PJ in his place).

Also, the electricity and signal isn't back yet from where I live so yeah, I'm writing this with no internet and will publish it when the electricity and signal is back which I estimate is probably gonna be by mid-January (pls wait for me Xiao and Ganyu rerun banners and Lantern Rite rerun event-) due to the many electricity posts and wires that were blown down and the damages that were caused by Typhoon Odette. Stay strong and safe out there, my fellow Filipino victims in the Visayas and Mindanao regions.

We good ? Okay good, enjoy.

- Mel }

♡︎ Ship : NAJ! NightKiller (but it's not illegal) ♡︎

☞︎︎︎ Requested by : No one ☜︎︎︎

ꕥ Genre : ☁️ (developing) Fluff ☁️ꕥ

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If there was one thing Nightmare Joku loved about his job as a teacher, its that he loves teaching history. It's the reason why he's a history teacher at UnderHigh after all. He has a passion about learning the history of great big things, historical events, and where they come from because it makes him curious and he is curious, which is why he has dedicated his whole life to teaching history to others. What he dislikes however, are students who don't pay attention nor participate during his class lectures or during oral participation. "Can anyone here tell me when the great war between the humans and monsters started ?" He asked the class that he was currently teaching history to, a frown forming on his face when he got no response.

"Anyone ?" He was about to shake his skull in disappointment when a single hand shot up in the air. The hand that was being raised belonged to a young skeleton named Killer. Killer Rahafwabas was a 17-year old student who is smart and loves history. He's basically Nightmare's star pupil during history class because he's always participative, energetic in answering questions, always has an answer (sometimes they turn out to be wrong, but most of them are correct), finishes his tests firsts, turns in all his assignments and projects on time, and has the highest scores. He's a straight A student in every subject that other students and his classmates refer to him as a nerd. And since Killer participates and is active the most in history class and being Nightmare's favorite student, he's also referred to as the teacher's pet. But Killer never bothered to acknowledge or let the nicknames get to him. His favorite teacher is Nightmare after all.

A smile quickly replaced the frown on Nightmare's expression when he saw who that hand belonged to. "Ah, yes Killer ?" Nightmare was still a bit disappointed that nobody other than Killer raised their hands and that only Killer was participating most of the time, but at least Killer actually does his best in his class. He never gets tired of hearing Killer shoot his answers at him. A few murmurs could be heard in the back, and you could hear someone mumble "teacher's pet" but Killer paid no mind at all and stood up.

"It's the 16th of September 19XX !" Nightmare nodded, clapping his hands with a small smile. "Correct. Good job Killer, just as I expected from my star student." He praised, making Killer blush, flattered as he giggled softly and sat back down all giddy while some of his classmates just rolled their eyes at him.

"The rest of you should participate more too you know. Killer isn't the only student in this classroom." Nightmare stated, looking over at the entire class. "He's a teacher's pet, of course he'd always participate when it's you who's teaching." Scoffed Paperjam, one of the 'jocks' of the school. "Watch your mouth PJ, your dad won't want to hear of this." Nightmare scolded, turning around to face the chalkboard. PJ clicked his tongue, grumbling before glaring daggers at the back of Killer's skull who didn't even bother to express a reaction and just continued to focus on Nightmare as always.

The eyeless skeleton had an adoration for his history teacher ever since the day Nightmare had started teaching his class which was about a year ago which was why he was always active during history class. Well, that admiration had likely developed into a crush because Killer couldn't stop thinking about Nightmare everyday, daydreaming even during class. The way Nightmare just speaks is enough to get Killer sighing dreamily. But of course, Killer knew that his crush on Nightmare and their relationship wouldn't go further than just a student and teacher. It was illegal for a teacher to date a student, and Killer didn't even know if Nightmare felt the same for him, he doesn't even know if he's into males.

He was devastated, heartbroken, and felt hopeless when he found out that Nightmare was dating Ms. Muffet, the school counselor (idk what this bitch's role is in NAJ or I must've forgotten), about a year ago, but his hope was restored when he found out that Nightmare had broke up with her when he found out that he was cheating on him by finding her kissing some unknown guy at his own home. Nightmare ignored her entire existence even at school after their break up. Even after that, Muffet still kept trying to apologize to him and asking for them to get back together again even until now, but Nightmare made it clear that he's never getting back with her. But still, Killer could only be hopeful even if it's useless to hope for a chance to be with Nightmare. It's his last year of college this year, and he's graduating soon which means he doesn't have much time left.

The school bell rang loudly out the hallway corridors, signaling the end of today's classes. Nightmare sighed, turning back around to face his class. "I think that's all the time we have for today. Remember to do your homework and answer pages 189-191 on your history book." Everyone except Killer groaned. Nightmare just rolled his eye lights at them. "Class dismissed. Goodbye everyone, I'll see you all totomorrow. The students began gathering their things and packing up their backpacks, standing up and began leaving and chattering with each other. Killer packed up as well but he didn't leave just yet since he promised to help Nightmare check some papers from their history quiz earlier that day.

Soon, everyone else had left, leaving Killer alone with Nightmare in the classroom. Killer felt his soul thump out of his ribcage as he made his way up front towards Nightmare's desk. Nightmare was already aware that Killer stayed behind to help him check the quiz papers so he already grabbed a chair and dragged it beside his for Killer to sit on. "I still wonder why you'd rather stay behind and help me with a few papers other than going home or hanging out with friends." He chuckled, looking at Killer who took a seat beside him.

Killer smiled shyly, fumbling with his fingers a little. "I just like helping you, that's all. It's pretty fun checking papers and assignments." He answered to which Nightmare just smiled, giving him a pat on the skull. "You surely are a different kind of breed Kills. The smart kind." Killer blushed again, his soul beating fast at the compliment and nickname.

'Oh stars, he's such a nice and kind person !'

"E-Ehe, (Venti ?) t-thank you very much Mr. Nightmare !" The flustered skeleton managed to say while trying to calm down his soul's rapid beating. Nightmare chuckled again, sliding over a small pile of papers in front of Killer on the desk and a red pen. "Well then, let's get started now, shall we ? I don't want you going home in the dark. The streets are ten times dangerous during nighttime." Nightmare said, uncapping his own red pen, ready for checking. Killer nodded, uncapping the pen that was given to him with a hum of agreement. "Mhm !"

And for the next 30 minutes, the teacher and student duo were busy checking Killer's classmates' quiz papers, talking with each other while they did so, asking how each other's day was and how their life was going, the normal talks whenever Killer would help Nightmare with stuff. Some jokes and puns were thrown here and there, resulting into laughs and giggles (the giggles mostly came from Killer).

"A job well done on today's quiz Killer." Nightmare said with a bright smile, showing Killer his quiz paper that had all his answers checked and a perfect 50/50 score circled on the top right. Killer giggled happily. "I just do my best, that's all." He said, becoming shy again. While Nightmare was halfway done checking the last quiz paper, a knock could be heard on his door.

"Oh Nighty, are you still in there ?" Nightmare's expression became grim at that female, high-pitched voice. "What do you want Muffet ?" He asked coldly. By the mention of her name, Killer paused in arranging the pile of checked papers in his hand to look at the door.

'Oh, it's her... Why can't she just leave Mr. Nightmare alone ? The nerve she has to continue talking to him as if she didn't cheat on him at all.' He thought bitterly, but stayed silent to listen to how the conversation would play out. "Oh come on, don't be like that, I just want to ask if you'd want to hang out with me at the park. Like we used to do before you know ?" Muffet huffed from the other side while Nightmare just scoffed under his breath. "No, I'm busy. And I don't want to have anything to do with you. You can go by yourself."

"Ugh, fine." Muffet just gave up, annoyed and could be heard stomping away, her heels making an annoying and heavy tap-tap sound against the tiled hallway floor. While she stomped away, Killer heard Nightmare mutter "cheater" under his breath. "Are you alright Mr. Nightmare ?" Killer asked, his expression shifting to show concern for the older who just sighed heavily. "I'm sorry you had to hear this Killer, you shouldn't be involved in these kind of conversations." He said apologetically to which Killer just gave him a reassuring smile.

"It's alright Mr. Nightmare. I know I shouldn't have any business, but I'm sorry Ms. Muffet keeps bothering you and your life after uh..." Nightmare just shook his skull. "No, no, it's alright. Muffet has been suspicious from the start so I should've known she'd cheat sooner or later. But it's alright, I've already gotten over her and our break-up a long time ago and have moved on." He assured, adjusting his beret.

Killer nodded on understanding. "I understand. I hope she stops bothering you soon." Nightmare nodded. "I hope so too. Now let me finish this last paper and I'll drive you to your house." It wasn't the first time that Nightmare had suggested to drive Killer home. And whenever he does, Killer would always let him, not wanting to miss an opportunity to be with him longer. "Okay Mr. Nightmare." Killer said as he placed the neat pile of papers on the desk while Nightmare continued checking the last quiz paper.

Killer could hear him grumble about PJ getting the lowest score which was an 8/50. It wasn't really much of a surprise since PJ barely even tried in his academic subjects. The only subject that he puts effort on is P.E., and no it isn't because his father, Mr. Error, is the teacher/coach, it's because he gets to show his strength and well- annihilate people during dodgeball or basketball (to which Error disapproves and gives him a minus point each time he hurts someone both unintentionally and intentionally, usually intentionally). PJ never really listened to anyone at all, which was again, not much of a surprise. No one except his dad, Mr. Ink, who was the Art teacher of the school (he's scary when he's in a bad mood so don't fuck with him if you don't want to find yourself having a paintbrush shoved up your ass. Even Error is scared of him sometimes), and surprisingly and unexpectedly, Fresh.

Fresh is a good friend and classmate of Killer's. He was a nerd too, but more shy and quiet. He was known as the smart, yet quiet kid. He didn't talk much to others, only to his close friends like Killer. Which is why when Fresh stood up for himself when PJ tried to bully him one day and Fresh punched a locker beside PJ that left a huge dent in it, it shocked and appalled literally everyone who witnessed or heard of it. Even PJ himself was too stunned to speak as he just watched Fresh take a deep breath before walking away like nothing happened at all. After that incident, PJ found Fresh interesting, finding him certainly a lot more different than the other 'nerds' of the school. And somehow, they were suddenly known to be dating about a month ago. (Yes I ship PaperFresh, both outside and in NAJ, fight me.)

But enough about PJ and Fresh, let's get back to Nightmare and Killer. After finishing their work, Nightmare packed his things and walked with Killer out of the classroom, Nightmare locking the doors with a key from his key ring before they walked down along the hallway corridor and exited the school. The school campus only had a few students left, who were either waiting for someone to pick them up, studying under the trees, or waiting for their friends.

Nightmare lead Killer towards the school's parking lot where his car was parked in one of the parking slots. He grabbed his car keys from his vest pocket and pushed the red button on the center, the car letting out a high-pitched 'beep' sound twice before a click was heard, allowing Nightmare to open the doors, being a gentleman and opening the door to the passenger's seat for Killer. Killer let out a giggle before thanking him and getting inside, sitting down on his seat and putting and fastening his seatbelt on while Nightmare got on the driver's seat and fastened his own seatbelt before putting the car key in it's keyhole and turned the car's engine on with a low rumble.

"Are we set to go ?" He asked, turning to look at Killer beside him who nodded at him, hugging his backpack that was sat on his lap. With Killer's affirmation, Nightmare gripped on the wheel and began backing the car out of the parking area and then drove out of the school. Killer looked back and saw the school getting smaller as they drove farther and farther away from it until it was no longer in sight, watching the houses and buildings that they passed by through the tinted (from the outside that you can't see the inside) windows. While Killer was distracted with his sightseeing, Nightmare would glance at him a few times, a small smile on his face as he did so.

After a 15-minute drive, they finally arrived at Killer's house. It was just a small and neat looking house, and since Killer lived by himself with his bunnies, it was the perfect home for him. Nightmare stopped the car in front of the house's walkway path. "Thank you for driving me home once again Mr. Nightmare." Killer said with a beaming smile, grabbing his backpack's straps and draping them over his shoulders and letting his backpack rest against his back.

"It's no problem at all Killer. It's the least I can do since you always help me with a few papers and things. Keep up the good work." Nightmare smiled back at him as Killer got out of the car and waved goodbye to him. "Goodbye Mr. Nightmare ! I'll see you tomorrow again at school !" Nightmare waved back with a nod. "I'll see you too tomorrow Kills." He said just before Killer closed the car door and skipped towards his house door, turning back around for a final wave at his favorite teacher (and crush) before opening the door with his house key and closing it shut once he got inside.

Nightmare chuckled to himself as he watched Killer disappear inside his home before driving away to his own home, eager to see Killer again tomorrow, which he questioned why he felt TOO eager when he saw Killer every school day. Nightmare shrugged it off for now, going back to focusing on driving. 'I really need a cup of coffee right now.' He thought. His twin brother, Dream, the *insert NAJ! Dream's role in the school is here because I'm not familiar with the entirety of the NAJ AU* (heck I can't even search up what his role is at the moment), would be out late tonight because he's going out on a date with Cross, the Martial Arts teacher of the school (at this point, I'm just gonna be making up my own version of NAJ which makes much more sense than the original NAJ AU ; don't even lie, the original was very much problematic and fucked up like its creator along with PJ's Daycare), so that leaves Nightmare alone at their shared house until at the late of night.

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"Fucking hell." Nightmare grumbled, being woken up by moaning noises in the middle of the night, coming from across the hallway end where his room was. From Dream's room. Seems like his and Cross' date became something else. "Damn you Cross, you brotherfucker." Nightmare muttered, using his pillow to cover his skull, the area where his 'ears' would be in an attempt to shut out the moans and the bed creaking noises. It worked, but he could still hear it muffled by the pillow. This wasn't the first time that he woke up to Dream moaning like a slut, in fact, this was the third time already. Nightmare cursed at Dream for being such a loudmouth and at Cross for fucking his brother. Nightmare had murder on his mind right now, thinking of switching Cross' chocolate milk drink for pure cow milk tomorrow during their lunch break.

It took two a whole hour and a half for the moaning to finally cease to a stop which allowed Nightmare to finally pass out into a restless sleep once again. He's gonna confront Dream about this tomorrow and would use it as blackmail in the future because why not ?

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"Are you alright Mr. Nightmare ? You look like you haven't slept much last night." Killer asked, highly concerned for his teacher when he noticed the black bags under his eye sockets when he entered his classroom earlier. "I'm fine Killer, just had to deal with something in the middle of the night last night, that's all."  Nightmare answered drowsily before a yawn escaped his mouth. "You should take a nap, you shouldn't force yourself to stay awake if you don't want to, it's unhealthy for you." Killer suggested, knowing that his teacher tended to act grumpy when he lacked sleep. How does he know about that ? Well, from experience. It happened a few times during history class.

Nightmare would usually stay up late at night to check assignments, projects, or get himself ready for the upcoming lessons which resulted him into becoming a bit drowsy and tired while teaching. And when the class messes or decides to not cooperate with him, it will piss him off, especially when he hasn't had enough coffee. One time, when PJ was talking back to him, Nightmare lost his shit and slammed his fists onto his desk, cracking the wood a little on the smooth surface. No one else decided to mess with him the next time he lacked sleep during class after that.

"Do you want me to get you a cup of coffee from the cafeteria ?" Killer asked, wanting to put Nightmare at peace. "Hn.... That would be nice..." Nightmare muttered, slumping his skull on his arms that rested on his desk. Killer beamed, nodding. "Right away Mr. Nightmare ! I'll be back as soon as I can." He said before quickly walking out of the classroom to get a cup of coffee from the cafeteria since it was currently lunch time at the moment. Soon enough, Killer was walking back to Nightmare's classroom, holding a paper cup of steaming hot coffee in his hand. He was thankful that the line wasn't that long when he went to the cafeteria and it went fast too. "Ah-ow-! Hot-!" Killer quickly switched the coffee cup to his other hand but it had accidentally slipped and spilled on the person that happened to have walked right past him.

"OUCH-! What the hell ?!"

"I-I'm so sorry-! I-It was an accident–" Killer was quick to apologize but when he saw the person who he accidentally spilled the coffee on, he froze on the spot.

{ Cliffhanger because yes.

- Mel }