An Oath of Mercy || UnderFell Sans x Reader

three

Ok so maybe not in your pocket, but the effect on the other monsters was immediately clear. As Papyrus marched through the town of Snowdin—and Sans dragged you along behind him—you watched the other monsters eye you with bloodlust. It was uncomfortable, to say the least, and you felt Flowey hide in your coat as soon as he spotted a bear monster licking his lips. Despite the way Sans dragged you like property, you couldn't help but look around in fascination. This world—as deadly and frightening as it was—was a mystery you found yourself wanting to discover with every new thing you learned about it. Maybe now that you were under Papyrus' protection, you could learn about your new home without (as much) fear.

"You found a human?" a dog asked, her snout poking out of a dark hood. In her paws was a giant ax, and you couldn't help but notice the red glistening along the edge.

"YES, DOGARESSA." Papyrus turned to the dog with a sickeningly sweet smile, and you felt a shiver travel up your spine. "SHE FIXED THE BONE YOU TRIED TO BREAK." He stalked forward with each word, and Dogaressa shrunk back with a whimper. So when he called her a bitch he meant that literally, huh? Another dog pulled her away from Papyrus, and they nuzzled up to each other.

"SHE'S MY PROPERTY!" Papyrus turned to the town at large, his voice commanding attention. "YOU ARE NOT TO TOUCH HER UNLESS YOU WISH TO EXPERIENCE MY PUZZLES FIRST HAND!" It was captivating watching him talk to the other monsters, the sheer authority and respect he had was staggering. You weren't losing his shield of protection no matter what.

With his announcement made, he marched towards a house in the distance. Sans tugged you along, still moody about this turn of events. The house was as bland as a Surface one, with a torn skeleton flag on top of it as its only decoration. Papyrus marched inside, leaving the front door wide open, and Sans all but pushed you inside. You stumbled, just managing to bump into a table to keep your balance. You aimed the glare that was meant for him at the ground, telling yourself you needed them to like you. Or at least tolerate you.

The house was homey enough, with a kitchen, couch, TV, two bedrooms likely for the two brothers upstairs, and the smell of death was only faint in here. You examined the couch for a moment, figuring it was probably comfier than it looked. At least that's what you were telling yourself.

"WHY DID YOU BRING HER IN HERE? TAKE THE HUMAN TO THE SHED," Papyrus scoffed at his brother. Your eyes widened as Sans grabbed you, the first smile you'd seen stretching across his skull. You didn't like it. He pulled you outside and over to the shed next door. It was...less homey. There was a dog bed with old kibble in a dish next to it behind a bunch of bars, and death was all you could smell. There was a paper towel in the corner and blood stains across the wooden floor, and you felt your hope die. Maybe this wasn't as good as you convinced yourself it was.

"Welcome to your prison." Sans sounded joyful for once, it was a shame it had to be to your detriment.

"Wouldn't it be better if I stayed in the house where I can look after your brother's arm?" you asked, trying one last time to get out of this.

"Boss said you stay in the shed." He shrugged like it couldn't be helped. What was his problem with you?

"What is your deal?" He grabbed your coat and yanked you towards him so you almost knocked your forehead against his skull.

"I don't like you. In fact, I fucking hate you. But because the Boss wants to babysit a motherfucking child, I'm stuck doing the grunt work." You mumbled that you weren't a child and you felt a bone slice your arm. You cried out, fear finally settling in as he grinned sadistically. "Oops, looks like you tripped." So he was gonna hurt you and get away with it? You were over the moon. 

"Look, Sans-"

"It's Master to you."

"Fine, Master. I just want to help your brother out, my intentions are pure. You monsters must understand quid pro quo, right?"

"Stop using fancy words to make me feel dumb," he growled.

"He helps me, I help him," you explained. "We mutually benefit from this arrangement, so why would I want to stab him in the back? Why would I want to stab you in the back?"

"Because you're not helping me, fucker." So he was a little smarter than you gave him credit for.

"Ok, fair. Then what do you want me to do for you?" You really weren't enthusiastic about owing anybody else, but if you were gonna survive this, you might as well try to more than barely scrape by.

"I don't need anything from you," he spat.

"Well, yes." You rolled your eyes and he grabbed your throat, making you squeak.

"I want to see you bleed."

"O-Ok, that I can't do." You wondered faintly how long it would be before Papyrus would come to check on the two of you. "Your brother wants me around, so you don't have a choice but to deal with it. Neither of us are happy about this." His grip on your throat loosened a tiny bit. "So if we can find some common ground—something both of us want that the other can provide—then maybe this won't be complete torture."

"...Fine." He released your throat with a huff, and your hand went to check for damage. "What can you give me?"

"Hmm." You looked him up and down, and his brow bones knit together self-consciously.

"Stop that shit."

"I can help you whenever you get injured." He waited for you to continue. "And...I can put in a good word to Papyrus, tell him you actually did a great job setting his humerus." He waited still. "And..." You couldn't think of anything substantial. "Help you with chores or if you wanna kill someone or make you food-"

"So you'll be my servant?" His gold tooth gleamed in the dim light as he smirked.

You flinched. "No, but I can wait on hand and injured foot as best I can when Papyrus doesn't need me."

"So a servant."

"Don't call me that, please."

"Then what do you want outta me?" His smirk hadn't faded, and now he was crossing his arms as he looked down at you. You had to think about your answer.

"You don't harass me anymore, and you treat me with the respect Papyrus deems me worthy of."

He snorted. "Respect? You're nothin' more than a shitty pawn for him to use." You tried to avoid glaring at him.

"Just don't make my life hell, ok? I'm trying to get out of here, so let me do what I agreed to with Papyrus and I'll be out of your- bones, I guess?- in no time."

"So you be my servant and I'll think about being nicer to you." He grinned his sharp teeth at you.

"Don't call me that."

"Is that our deal?"

"No, I help you out when I can, and you be nice to me like Papyrus expects you to."

"Fine, whatever. I'm sick of looking at your fugly face." Whatever gets you to leave me alone, buddy. He held out his boney hand and you both shook on it.

"Glad we could come to an agreement, Master." He clearly liked that term of authority because he grinned down at you.

"I'll see you tomorrow, doc." At least he wasn't using a demeaning term anymore, even if he likely thought it was. He walked out of the shed door, locking it once he was outside, and you turned to the 'prison'.

You really hoped this agreement didn't come back to bite you. As soon as you could, you were getting out of here. This was just a tiny roadblock, everything was going swimmingly. You just needed a little time to get the situation back under control and soon this would be nothing but a bad memory.

...the lie wasn't as convincing as you hoped it would be.