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Bedtime Promise

This is a secret santa gift for @victoriasandres0599, thanks to the @undertalesecretsanta​ secret santa event! Sorry it’s almost a little late, but I have your Underfell story here for you - I hope you like it.  (You can also read this here on AO3)

Bedtime Promise An Underfell short story

Words: 903 Summary: It’s time for Papyrus to go to sleep, but the little monster doesn’t want to.

"Sa-ans, I don't wanna go to sleep!" The tiny skeleton scowled up at his bigger brother. It looked more like a pout than a scowl, scrunching up his pointed little face. "I wanna play some more!" The energetic skeleton bounced in place, just about the farthest thing from tired and sleepy.

Sans really wished he had some of Papyrus' energy and enthusiasm, but it seemed as if the younger and far more excited skeleton had stolen his vitality and was using it to bounce around. Sans grimaced, feeling even more tired as he watched the energetic display. "c'mon, bro, you know you hafta' go ta' sleep," Sans pleaded.

"Nuh-uh!" Papyrus shouted, shaking his head rapidly and in all directions, looking like a wet dog monster trying to dry off. Sans closed his eyes and tried to gather his strength as Papyrus began repeating himself, growing louder and more empathetic with each repetition. "Nuh-uh, Nuh-uh, NUH-UH!"

"Papyrus!" Sans cried out, and Papyrus quieted. "hey now, don't you want to be ready and full of energy tomorrow morning?" Papyrus nodded with full force, canines gleaming as he tried to show off just how energetic he would be. "you won't be if you don't get some sleep tonight. you'll be tired and want to lay-about like me – you might even take a nap in the middle of the day."

Papyrus gasped in horror at the thought. Sans took no offense at how offended Papyrus was – just as he didn't understand how his brother could be so full of energy and so alive all of the time, neither did Paps understand that Sans liked to rest and conserve his energy for when he really needed it. That was far more unfortunately often than he would like, in this kill or be killed world of theirs.

As much as it made going to sleep a trial every single night, Sans hoped that Papyrus never lost that energy, his boundless enthusiasm. It was a good defense against the world, keeping Papyrus safe and ready to fight back or run for far longer than most anyone else could. Right now, though, there was no need to fight or flee. They were as safe as they could be, and they needed to rest for when they weren't as safe tomorrow.

"-and then I wouldn't be so Great, because you can't be great if you're always sleeping instead of going out and doing great things!" Sans tuned back into Papyrus' babbling, going on a rant about how he'd never be as lazy as his brother. "However, I am the Great and Terrible Papyrus," Sans bit back a snicker – his bro had decided that would be his nickname a time ago, and refused to ever let it drop – "and as such, I will continue to go out and do Great things! And people will stop fighting and look up to me and see how great I am! And those that keep fighting, I will be terrible to, and then they will be terrified into seeing how great I am!"

"ya can't do that if you don't get ta' sleep soon, paps," Sans broke in. "look, bro, i'll – i'll even do that thing you like me to do." Papyrus instantly stopped what he was doing, and zoomed over to Sans. His sleeping 'cape' fluttered out behind him, a soft red blanket tied around his neck. It had seen plenty of wear and tear, and was more than a little bedraggled, but it was beloved and both brothers took utmost care with it.

Sans felt a magic blush light his cheekbones as his brother stared at him with rapt attention. "Please, brother?" Papyrus said softly, looking up at him with big, pleading eyes. Sans felt a familiar wash of anger as he spotted the crack along marring his brother's bones, but that just made him more determined to keep Papyrus safe; and if keeping his bro safe meant embarrassing himself, then so be it.

Papyrus didn't seem to think it was embarrassing, at least, and his precious brother's opinion was really all that mattered. "you gotta get into bed first," Sans began, and Papyrus had already launched himself into his sleeping area before Sans finished the sentence. Sans let a genuine smile grow across his fanged face; his brother was so cool… and adorable. "alright, then." Sans cleared his throat awkwardly, and Pap wrapped his 'cape' up around himself.

"hush my brother, it's time to sleep, "quiet down here in the caverns deep.”

"wrap your cape around you tight, "brothers gonna tuck you in tonight.”

"little monsters need their rest, "that way they can be the best.”

"and you'll grow up big and strong, "righting the world and fixing the wrong.”

"hey i know that you'll be great, "to be terrible is your fate.”

"and i'll be beside you there, "that is something i'll always swear."

Sans let his voice trail off as whistling little snores filled the room, his brother already fast asleep. Maybe it was still a little embarrassing to actually sing out loud to his little brother, but it was worth every moment for the peace it brought. The most precious thing in the world to him could finally lay down to rest, the still-innocent soul relaxing and trusting in Sans to keep him safe.

"i'll always be there for you," Sans swore quietly beside his brothers bed. "i promise."