Birds chirped as pupils peaked out from under a turrent of white hair. They stared deathly at the wooden desk, lightly groaning as Sans dragged himself up from his nap.

He was in the teachers facility room, in his assigned desk besides Aizawa's. Or, as he called him on a few occasions, Eraser top. The reason behind Sans' awakening wasn't natural, no, as a ruler had been lightly smacked against the back of his head.

"The students will be coming in ten minutes," Aizawa said, laying a brown paper bag next to Sans' head. "And my wife made you lunch."

"Heh," Sans muttered, sitting up in his chair and lightly rubbing his eyes. "Thanks."

It's been eight months since he ended up in this world, and quite a lot had happened. Not much significant, if he were to judge. Sans didn't really fight any villains or get involved in much so far. Aizawa took Sans back to his house to meet his wife (lovely woman, loves to cook, so safe to say Sans was totally willing to stay for the food) while he was registered as a new person. Sans font, with the quirk known as the Skeleton quirk, which gave him the abilities of a skeleton. Aizawa said it'd be best for Sans to pretend his other magic didn't exist in public, to keep it hidden from villains, which Sans was totally down for.

After Sans was set up, he just learned about this world. About the schools, quirks, expectations, things like that. He wasn't great at it, but Sans had his own little house, a decent understanding of the world, and was officially Aizawa's assistant teacher, so that was pretty cool.

Well, that last part wasn't fully true. He was assistant teacher to the class of 1-A in the school. Class 1-B, the only other class in the hero's program, wouldn't have an assistant teacher. Bad for them, Sans' puns were awesome.

Sans was frankly really glad he was being put in with teenagers instead of children. Sure, Sans was good with kids, but he was a more upfront and real kinda guy. And he was better with dealing with angsty teenagers and their drama. No one knew this, but Paps went through one hell of a rebellion phase. Even drew black lines around his eye sockets and wore leather coats. He always made sure to bring that up to make Papyrus' face go blushing real fast. Good times.

The annoying part about his new life was certainly the stupid fights that broke out on streets. All. The. Time. He was patient, but teleporting in public always caused a panic, forcing him to backtrack and find a less populated spot to shortcut away in. Aizawa once got startled so hard he screamed like a little girl. Sans was never going to let him live that down.

The worst was the separation of good and evil. Sans' karma abilities didn't exactly like that. He was always a middle guy, never picking sides, always staying in the background until he had to step in. Being a hero sounded awful. That's why he was glad just to be some assistant teacher to make sure the kids wouldn't get themselves killed. That meant he could nap all day and enjoy constant fights, like a movie. Sounded pretty nice. No need to say who was good or evil, but just to sit in the background like he always did.

"She also wanted to ask if you were coming to dinner tonight," Aizawa said, bored eyes sweeping across Sans' desk.

Sans and Aizawa had an interesting relationship. Since they were kinda stuck together for three months before Sans got a place to stay, they ended up becoming friends. Aizawa wasn't as lazy as Sans, but he could come close, so they bonded other that, along with their deep care for family. Then there was Aizawa's wife, who ruled. She was awesome! Both she and Aizawa liked Sans' puns, so they would certainly continue to be friends.

"Course. Gotta add some meat to these bones, don't rib me on!" Sans yawned.

"That wasn't even an attempt at a good pun. How tired are you?"

"Very."

"That makes sense."

"So I just gotta report down there with ya, right?"

"Yes. I'll be doing special training with them. Did you go over the exercises I prepared?"

Sans nodded. "For a bit last night. Guess they're going to miss orientation. Which means -" He pumped his fist excitedly. "I don't have to go to orientation. Score!"

The teacher orientation alone sucked. And Sans was an assistant! How come he had to suffer? The most he had to do was follow around one class and keep them calm. That should be it.

"I'll meet you there. Make sure to take a shortcut over."

"On it teach'."

When Aizawa finally dragged his scarfy face away, Sans leaned back, watching the ceiling with tired eyes. He saw the kids in the entrance exam, they were good. All of them. Undyne would be happy to have those little kids on her guard.

He sighed, and pulled himself out of his chair, hands digging into his hoodie pockets. Sans managed to snag a blue hoodie kind of similar to the one he wore before, but this time with longer black basketball pants. Aizawa had been a real help with a diet for Sans' body. The poor girl had been on the brink of starvation before he took over, but now the body was better.

Maybe he could scare his students with a shortcut. That'd be fun.

When he finally did arrive, it was to talking from within the classroom. Aizawa had a clear look of annoyance across his face, obviously so done with this class despite it being the first day.

"Oh, hello Sans. You're late."

Sans let loose a shrug, grinning at the students as he stepped inside. "Sorry. Got caught up eating a hamburger. Guess we'll have to ketchup right now."

A few giggles, some groans. Okay. Divided crowd. He recognized them all. Particularly two from his first day.

"Hey chomps, 'member me?" Sans offered a wave to the blondie.

"Chomps?" He screeched, face red and puffy from being angry quite often. Oh, he was not going to be fun to deal with.

"You're that bone lady, from when we fought the slug!" The green haired boy said.

"This is your assistant teacher, Sans. Unlike me, who has you only certain times of the day, she'll be assisting all of your teachers for your class and getting to know you kids. Today she's just sticking with my class since it's her first day."

At first it was a bit weird to be called a girl, but he found he didn't really mind it. If anything, the teaching part was going to be the biggest adjustment. Tori always loved teaching kids, Sans wasn't exactly great at teaching them things.

"Sup. I'm Sans. Your assistant teacher. Here to be asked questions." He paused for a moment, looking over. "I'd sit down to nap but we're about to be moving."

"Moving?" One of the girls asked, raising a hand.

"We're doing a quirk test." Their homeroom teacher held up a uniform. "Get changed and go outside."

"Won't we be missing orientation?"

"Yes. I don't care. Go get changed."

Sans watched with amusement as the kids almost jumped out of their seats to get changed. Once the room was drained of their manic energy, he turned towards Aizawa, grin steady on his face.

"So?" Sans asked.

"So?" Aizawa hummed in confusion.

"You didn't like greenie when we first watched him." Sans leaned against his podem, poking the mans cheek. "I know you're big on expelling kiddos, but uh... maybe give him a chance?"

"Injuring his entire body everytime he plans to use his power is self destructive, I won't support that."

Aizawa sighed, twisting his head back and forth to stretch his neck. Sans knew his neck was one of the guys more important parts. Sure, the eyes were needed for his ability, but if he turned his head too slow, it wouldn't matter. Aizawa needed to be fast turning his head to stop someone's quirk.

"Let's go," He said, "And while your puns are funny, please don't say them to the kids too much. This is serious training that can -"

"That can make or break their futures, yeah," Sans said, "But that doesn't mean they can't feel a little happy doing it. We're training kids, Aizawa, not soldiers. Ain't that why I'm here? You teach them, I entertain them and keep 'em happy."

He sighed, then like a slug, rolled off in his thick, almost suffocating bag. Sans shrugged, still grinning, and ported away.

~~~~~~

A quirk assessment test. That's what Aizawa had prepared for the kids. Sans had brought out a lawn chair, with a cushion, and was sitting criss crossed upon it as Aizawa explained the basic rules of the surprise test. Every once in awhile, Sans would add in a joke or pun. Aizawa almost snapped at them for a moment about not taking it seriously enough, but Sans quickly butted in to calm him down.

"This just means you guys have to acknowledge that this training is meant to prepare you for real deadly events. It might be a game now, and you guys can have fun, but there are going t'a be consequences if you always think it'll just be a game. Sure, have fun now, that's alright, but this ain't middle school anymore." Sans shot a look at Aizawa. "Be a little nicer to 'em, buddy. C'mon."

Aizawa rolled his eyes. "Sans, sometimes you just... nevermind."

"I know. I make guys speechless."

One kid from the class, some boy with red hair, covered his mouth as a snort escaped.

"Bakugou," Aizawa said, looking at the blonde kid that bit Sans before. "You're up first."

"It's chomps man!" Sans said, perking up. "Hey! How's the teeth? Still biting people who try to save you?"

The kids face quickly flushed at that reminder. "Hey! I didn't need your help! I was trying to attack and you got in the way! Both you and Deku!"

"Got in the way of closing yer mouth apparently." Sans winked at him.

With an annoyed huff, Bakugou glared sharply at Sans, and snatched the ball from out of Aizawa's hands.

The test pressed on, bringing some students some nervous shivers at the thought of being expelled. Sans managed to talk good old Aizawa out of expelling a student on the first day, though he had a sneaky suspicion that Aizawa was simply going to expel them on the second day. Aizawa was that kinda guy.

Through the quirk test not only did the students get to learn about one another, Sans also got to learn about them. Some of them had some really awesome quirks. Bakugou - Sans was debating to call him chomps or biter, not sure on a nickname yet - had explosive powers. Midoriya, or Deku, didn't seem to be using his powers, and that was with good reason. Uraraka, some brown haired girl, could float things with only a touch. So far, even though Sans wasn't supposed to pick favorites, he found her the best. Mostly because she laughed at his jokes.

There was one kid, which Sans already forgot his name, who really seemed to obey authority. He respected the hell out of Sans and Aizawa. And honestly, looking at the two of them, the kid really shouldn't. Aizawa and Sans were lazy little shits that had to be cared for by Aizawa's wife. She was a godsend of a person.

Seriously, who makes such good casserole?

"Sensei Sans?"

One of the students, Momo Yaoyorozu, had approached him with a raised arm.

"No need kiddo, just call me Sans," Sans said, turning towards her. "What's up?"

Yaoyorozu nodded swiftly. "Sorry. I was just wondering what your hero name was, Sans. Our academy is full of popular heroes as teachers, but I don't recognize you."

"That's easy," Aizawa stepped into their conversation, arms crossed on his chest. "Sans isn't a hero."

"What?" Apparently he had spoken louder than he intended, as over half of the class had turned their heads sharply.

"I'm not a hero or villain. I'm a middle person, I like to stay in the crowd and watch a lot, I just step in if someone's about to die." Sans picked at his teeth, feeling rather tired despite having claimed a nap. "I'm not a qualified or registered hero. I was just admitted to the program because Aizawa requested for an assistant teacher, and since he's your homeroom teacher, that's why I'm stuck to your class. Nothing really more to it."

Sans hasn't really had any opportunity to use much of his magic in this world, so the school couldn't judge his full extent of his powers. They probably would have eagerly made him a real hero if he did, but Sans wasn't really that type of heroic figure. That was Papyrus, each and every time.

"I don't care, we have a hot teacher," One of the kids with grape like hair muttered, almost dooling to himself.

"Mineta, shut up and throw the ball," Aizawa said, tossing the object so fast the boy had no chance to catch it, effectively having it slam into his face and cause him to land onto his butt.

And just like that, they were back on track.