Frisk brushed her bangs away from her eyes futilely as the wind whistled around her. She had been out on the special mission for only three days, but shouldn't something have happened by now? She WAS practically right on top of a known Monster base.

It was no matter. The extra time only gave her more opportunity to prepare, to learn, to memorize. General Chara had explained to them that some misguided humans believed the Monsters were not enemies, but misunderstood, and that the Monsters would take them in. For them, it seemed, having a few humans on hand to disconcert the HDM troops was worth the 'hassle' of not killing them immediately.

She would pose as one of these 'refugees' and infiltrate the enemy. Once she had learned all she could, Frisk was to escape and return to Chara himself for a report. For this single, important mission, he promoted her to a lieutenant, the highest a cadet had ever been promoted right out of boot camp.

Frisk was a legend among her peers, though due to her tendency for seclusion no one really remembered who she was or what she looked like. That, too, was no matter. All that did matter at this moment was to follow orders.

Once... Frisk remembered when she had reacted quite the opposite about following orders; she used to be as rebellious as they come.

That was before she returned home from one of her tantrums to find the old farmhouse, the barn, the shed... All burning. Frisk never found her parents' bodies. She would make sure to find the monster responsible. It wasn't a doomed quest. She knew exactly who had done it.

Sans the skeleton.

Frisk would kill him, she would scatter his dust, burn him, destroy him, grind him under her foot.

His bones were marked for death, and she would be the one to do it.

But first, she had to find him. If only Commander Chara had given her a map. But, of course, that would be too suspicious. She had to look like a refugee fleeing the battle, not the well-prepared soldier that she truly was.

Frisk decided to rest for a moment, pulling out some scant rations and a small bottle of water to eat while she sat against a small boulder.

"*FREEZE!"

Frisk jumped up, looking around wildly until her eyes met those of a Snowdrake. He grinned at her toothily. Of course she'd known he was there from the start, but untrained citizens weren't highly trained like she, and it would have been a dead give-away if she didn't act like one.

"*Get it? Freeze? Cuz I'm a Snow... Oh, forget it. State your name, business, and affiliation now or else!"

The Monster had scowled when he got no laugh and grew serious. Frisk played along, cowering away.

"P-please! D-don't hurt m-me... I-I just want to live..." She whimpered falsely. Though it pained the girl to even act cowardly, it was the only way. "M-my name is Frisk... I-I just wanted to g-get away from the fighting and... And I'm not affiliated with a-anyone, I swear! Please don't hurt me!"

The Snowdrake advanced, looking halfway between belief and reservation, when another voice sounded.

"*TOBY, WHAT HAVE YOU FOUND?"

Frisk flinched at the extremely loud volume, especially since the shouter was no more than a few feet away from her, behind the rock.

"*Human. Female, I think... Young-ish. Claims to be tryinna 'scape the fightin'."

"*GOOD JOB, TOBY! LITTLE HUMAN, SHOW YOURSELF TO THE GREAT PAPYRUS!"

Papyrus... Papyr- Frisk KNEW that name. He was SANS' brother...

She rose slowly, unsure what to expect. There were hundreds of stories about the skeletal brothers. How Papyrus, head of the Royal Guard, could take on dozens of humans at once. How he killed everything in sight during one of his battle rages. How many innocents suffered at his large white phalanges.

She would kill him, too, Frisk decided. Show Sans what it was like to loose someone HE loved.

That is, if Monsters were CAPABLE of love.

"H-hello..." She whispered, not having to try too hard to act intimidated. The skeleton standing only a foot away from her was by far taller. Perhaps, even, by a good two or three feet. Frisk was short- it ran in her family- but even Commander Chara would be dwarfed by this giant of a Monster.

"*HELLO LITTLE HUMAN! ARE YOU HURT? WE WOULD BE HAPPY TO HEAL YOU AND GIVE YOU SOME PROVISIONS, IF YOU ARE NOT TOO PREJUDICED AGAINST US."

Frisk shook her head meekly, and Papyrus grinned at her wider than before.

"*EXCELLENT. TORIEL WILL BE PLEASED."

Toriel? The former Queen, now a formidable warrior and healer. There were stories of her fire magic healing human troops even while it burned them. No one was sure if this was unavoidable for her magic or if it was purposeful torture.

The Snowdrake, Toby, put a blindfold over Frisk's eyes. The two monsters assisted their human acquaintance- or prisoner, depending- over the rocky terrain to their secret entrance underground.

The heat of the sun disappeared suddenly, and Frisk knew they'd gone under. No turning back now, she told herself, and steeled her nerves for whatever atrocities were about to be witnessed.

"*YOU MAY NOW TAKE OFF THE BLINDFOLD OF SECRECY, LITTLE HUMAN."

"Uh... Thanks." Frisk finally said, pulling off the black cloth. She froze, rooted to her spot.

This couldn't be... "How is this possible!?"

"*WHATEVER DO YOU MEAN, LITTLE HUMAN?"

Papyrus asked, looking down at her in confusion. Frisk did not reply, slack-jawed at the sight laid out before her.

A cavern, perhaps as large as the former New York's Brooklyn, was laid out before her, twinkling with blue crystals and lanterns. Tents of various colors and sizes were squeezed together with walkways between them, both Monsters AND humans were strolling about casually, greeting each other as easily as Frisk had her friends above. Except, her friends were not MONSTERS.

Merchants, both species, had their wares laid out all over. Some couples were looking over a seedy-looking man's gold. Frisk noticed with horrified fascination as a male mouse-like monster with a large scarf kissed a human female as if it were normal for cross-species relationships to exist.

Perhaps here, in this nightmare of confusing images, it WAS normal.

Frisk was disgusted.

"*Hey, Paps."

She knew that voice.

"*Who's the Humie? Aww, no, Papyrus, not ANOTHER one of your adopted strays!"

"*SHE WAS LOST AND HUNGRY. I COULD NOT LEAVE HER ALONE, SANS."

"*We can't just bring someone in here without CHECKING them first, Paps! What if she's a spy?!"

"*I WILL ASK HER. LITTLE HUMAN, ARE YOU A SPY?"

Frisk snapped out of her temporary stupor, focusing on the loud bag of bones. "Er, what? No. Why?"

"*YOU SEE, BROTHER. SHE IS NOT."

Frisk turned her head, preparing herself to meet...

Sans' eye sockets were only inches from her own eyes, but she didn't flinch. There were no pinpricks of light in them. It was obvioushe was not happy with her. The feeling was mutual.

"*Hey, sweetheart. I'm Sans, nice ta meet ya. Ya pals with my bro, huh? Good, good... I'm sure you'll be nothing but nice to him, yeah?"

He spoke friendly words, but they were obviously a death threat. Frisk met his gaze evenly, even though on the inside she was terrified of this Monster, the killer of her family. He was taller than her, matching Commander Chara's height... And his power.

"Of course, I would never do anything to make myself unwelcome."

"*Good, sweetheart. Good."

The light returned to his eyes, but Frisk knew better than to relax.

"*I'll watch your back, Frisk. Real close. So ya... Don't have no trouble, ya know?"

He grinned at her with a long, slow wink. They understood each other perfectly. In fact, Frisk was SURE he knew what she was here for. He was most likely humoring his brother until Papyrus lost interest in her and Sans was able to kill her like he had her family. "Oh yes, I know."

"*You have a good day, sweetheart."

"Good day to you, Sans."

Frisk watched the skeleton walking away for a moment, glaring at the back of his hoodie. Though she'd never introduced herself, he knew her name. Both of them knew why, butneither would tell anyone else.
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Honestly there aren't enough fanfictions where sans hates frisk or the reader (in reader inserts). Seriously think about it!
And not only he should dislike them, but... Has anyone realized just how ruthless sans is? I mean, he's...

During the date in pacifist run, "You'd be dead where you stand." He means that.

In genocide, it's nearly impossible to beat him.

Sans is chill about everything, but just imagine if he was actually evil. Like, Error and Fell!Sans are jerks, but I don't think they're really EVIL. But if they were... It would put Chara and Flowey to SHAME.

Let's hope he never does, you know? (Don't worry, that won't happen in this. BuuuutI might make some sort of story about that. Hm.)