Babybones in a Flame's Home

Universe:

Undertale

Characters:

Gaster

Grillby

Kid!Sans- 9 years old

Kid!Papyrus- 6 years old

Summery:

Gaster is finally free of his experiment. He is finally going to be the father he should be. However, as he decide to take his now official sons to his best friend Grillby things go wrong. (change in backstory of characters) Babybones and Dad!Grillby. we don't own Undertale. -slow going hiatus-

Chapter 1: finally free

Sans frowned waiting in their little room Papyrus was curled into his side still asleep. Gaster was late, Sans's internal clock told him so. The Doctor should have been there by now, taken Sans to a room and had him perform test. Not that Sans wanted to leave the safety of the room. It just made him distressed and anxious. Normally if the doctor wasn't on time it meant that something painful would happen or that he would take Papyrus. Sans clutched his little brother close. He didn't want to see his brother broken and in tears like last time.

Gaster rushed to the boy's room files in hand he was giddy. Today was the day! The final test! Once it was over he was certain he could get them out of here let them live as they deserved. He wasn't really paying attention to the maintenance signs that said safety rails were down temporarily.

Sans jolted as the sound of the key card outside their door was activated. Clinging to Papyrus Sans hissed angrily to the excited doctor cutting off what the man was going to say with a sharp "He's sleeping!"

Gaster covered his mouth giggling as he squatting in front of the boy "Sans I have wonderful news!" He whispered excitedly. "Today is the last test! We are free after today! I can take you home and we won't have to be in the lab anymore" he said

Sans blinked dumbfounded. "Free? No more lab?" Sans felt tears roll down his cheeks turning away from him hissing "lier! Meanie! There will never be a last test! You-you're a big jerk face!"

Gaster shook his head "no! I mean it! My contract is up... And I didn't renew it. I won't be bound here any longer... And I'm taking you both with me. I- I have a house in Snowdin and a friend he'll adore you guys! He owns a bar with lots of ketchup" he said knowing the boy liked the sugary stuff. "You don't have to believe me but I'll show you" he promised

Sans sniffled turning to Gaster with a tearful face "you-you really gonna stop? No lying. I-i don't care as long as Pap's safe. I-i'll stay here i-if you promise that Pap can go to the snow place."

Gaster smiled and put a hand on his shoulder "I promise" he said and picked him up "last test today I promise"

Sans gave him a small smile, one that was only reserved for his brother. "O-okay." standing up Sans struggled slightly with carrying his sleeping brother. Getting the babybones situated Sans looking up to Gaster with a grin. "Come on. Let's get this over with."

He nodded "we are just doing a physical today and making case closing notes nothing painful I promise" he said and picked them up

Sans have a small squeak flailing a bit at being picked up. Papyrus murmured curling close to Gaster.

Gaster took them to the exam room and got the things for the check up he was clearly more excited than usual

Papyrus whined yawning and scrubbing his sockets "wha going on?"

Sans smiled gently and rubbed Papyrus's skull. "We are gettin' a check up. Won't hurt promise. Then you are going to go somewhere different. Don't worry doc is gonna take good care of you."

"You too Sans... I'm taking you both. Grillby is gonna love you guys he always wanted kids..." he said

Sans looked up surprised and in slight awe. It wasn't a trick?

Papyrus tilted his head "what's a grill bees?"

"Grillby is a fire monster. me and him have been friends for a long time. He convinced me to quit my job so I can work from home, not as the royal scientist, and focus on helping people" he said.

Sans tilted his head "what's a friend? Is it like me and Pap? What are you going to do if not this?"

Papyrus nodded excitedly "what's a fire monster? Is he made of fire? What's a home? Why are you quitting?"

"A friend is someone who is there to help you and love you... Like brothers you two are brothers. I am quitting because I can't hurt you two anymore. I don't care if... If I don't set us free from this underworld." He sighed

Papyrus gave him a huge grin "I knew it! I knew you were good! Sans! Sans didn't I tell you!"

Sans sighed grumbling "I guess so"

Gaster nodded "you don't have to warm up to me Sans it's okay, I've hurt you both" he said

Sans shrugged mumbling "why don't we just get this check up over so we can go meet this friend."

Papyrus nodded excited "yes, i want to meet the fire man!"

Gaster gets them in the room and sets them down "alright" he said smiling getting his equipment a pep in his step.

Papyrus grinned practically vibrating in excitement "Sans do you think the fire man will be nice? Will we be able to touch him or will he burn us? I hope he's nice Nyeh heh heh."

Sans chuckled rubbing Papyrus's skull "sure he will be nice Pap. uh, i don't know about the touch thing. I mean since he's made of fire we shouldn't be able to touch him, but magic works different."

"You can touch him he doesn't burn" Gaster said reading their magic

Sans nodded to Papyrus at the answer "see Pap no worries. Bet the guy will even give you a hug. Probably be like our blanket, but warm heh."

Papyrus squealed excitedly "you think so Sans!"

Sans nodded "yup Pap. who wouldn't hug a cute skelly like you heh."

Papyrus preened under the praise

Gaster smiled and carried on the exam. they both were doing so good he was happy, happier than he had been in a long time.

Sans squirmed slightly as Gaster examined them but kept quiet.

Once It was over Gaster hummed "both of you look good we should have no problems" he said

Papyrus grinned hopping off the table grabbing Gasters lab coat and tugging on it "are we leaving now? What's it like? Will it take long? Is it bigger than here?"

Sans frowned hopping down tugging his brother closer "don't bug him Pap you know how he gets with questions. Here you can hold my hand instead."

Gaster hummed "it is bigger than here sort of" he said "but colder" he said and walked ahead of them "let's go I'll pack a few things later" he said leading them out

Sans was quick to follow keeping a loose hold onto Papyrus.

Gaster lead them to the elevator

Papyrus was excited walking close to the edge he leaned over in awe.

Turning back to Papyrus Sans gave a startled gasp pulling him away from the edge in a hurried motion. The floor under his right foot gave way with a crack. A startled yelp came from Sans as he became unbalanced tipping over the edge.

Gaster turned and gasped "Sans!" He said and dove toward the edge grabbing his ankle

Sans let out a small sob dangling from Gaster's hold. "H-help me! I-i'm s-sc-ared!"

Papyrus latched onto Gasters legs trying to help. "Sans Sans!"

Gaster felt himself slipping "Sans... I'm going to swing you up I need to you to grab the edge and hold on tight... Papyrus let me go and grab Sans understand?" He said seriously his heart sinking "get in the elevator go to the top floor and go out the left door" he said

Sans shook his head tears rolling down his skull and into the hot core below. "I-i can't! I'll slip!"

Papyrus squeezed Gasters legs once more before moving to the edge "I'll catch you Sans promise!"

Gaster shook his head "no you won't I'll make sure you make it" he promised "just listen to me okay?" He said sliding a little further

Sans nodded trembling and sniffling "o-okay i-i trust you G-aster."

Gaster nodded and closed his eyes taking a deep breath and swung himself over tossing Sans onto the landing for Paps to catch and losing the last of his hold he watched as his legs slid off and the boys and the landing went further away and the heat at his back grew hotter and hotter before his world was gone.

Sans landed with a thump turning quickly his fingers lightly grazing Gasters legs as he slid off. Sans almost went off again if Papyrus hadn't latched onto his waist keeping him away from the edge. Reaching to the falling doctor Sans screamed out in horror.
"Gaster!"

Soon he hit the lava in a burst of magic and the whole underground shook for a moment

Sans shook pulling Papyrus close. Tears running down his skull his slowly stood up taking Papyrus into his arms. "W-we need to go... Find his friend."

Papyrus shook, but nodded crying "I'm so sorry" he sobbed this was his fault

Sans shook his head nuzzling him and swiping away his tears. "It's okay. Everything will be okay. It's not anyone's fault." though Sans felt he was more telling himself that.

Papyrus clung to him as they searched for the elevator.

Finding it Sans pressed the up button and soon doors opened. Hesitantly Sans walked inside tightening his hold on Papyrus and pressing the button with a one on it. Sans let out a panicked breathe as the elevator started moving

Papyrus clinging to him and whimpered as the elevator eventually opened up to a basic looking lab and living space

Sans froze. "W-what did he say left or right?"

"U-um I think left?"

Sans nodded walking to the left door. Opening it he stepped out into the area in front of the large lab. Sans set Papyrus down as he looked around finding the path. It was hot. Sans could feel sweat start to form and he quickly started down the path. "He… he said the friend lived somewhere cold… w-we should be able to find it… can't be that hard."

Papyrus nodded and held his hand tightly as they walked scared of all the hot lava "what if it eats us?"

Sans gave him a small smiled leaning down. "Here i'll giving you a skelly ride and keep it away. Don't worry i'll protect you."

Papyrus nodded and climbed on "you are so strong sans..."

Sans gave a breathy chuckled situating Papyrus a bit before starting off again. "Big b-brothers are supposed to be… at least i think so. I'm older so i got to take care of you, my baby bones brother. Heh"

Papyrus giggled "well I'll be big and strong someday and I'll take care of you!" He promised

Sans smiled wiping away the last of his tears. "Yeah? I'm looking forward to it Pap."

After a few hours of walking the heat of hotland faded and they made it to the warm but wet waterfall "woah! It's dark!" Papyrus said

Sans nodded slowing down, walking carefully grimacing when he stepped in something squishy and slimy. "it's gross feeling..."

Papyrus wiggled "let me down I wanna touch!"

Sans shook his head "you don't want to Pap it's gross and i got it between my toe bones."

"Ewwwwwww" he said

Sans chuckled "yeah. oh look at those blue things. they're kind of like my magic all glowy like. wanna check them out?"

Papyrus nodded "yeah!" He said excitedly wiggling on his back

Sans smiled walking closer and finding a small dry patch of grass setting down his brother in front of one of the flowers. "woah. it's really pretty." he said poking it softly. the flower repeating back loudly "WOAH. IT'S REALLY PRETTY" Sans gasped falling to his tail bone.

Papyrus gasped "brother! It has your voice!"

Sans stared at it frowning and eyes wide. "I-i don't like that..."

Papyrus nodded "it's weird!" He agreed

Sans nodded standing taking Papyrus's hand and edging around the flower continuing down the dark path.

Papyrus walked with him "this is gross" he said

Sans looked to his brother, then to his feet "ah bro. look at you, you're a mess. you got this stuff up to your femurs. let's see if we can get ya all cleaned up."

"It's okay brother... We'll just get dirty again... Let's go I want to find the cold place" he said

Sans frowned but sighed and took his hand "fine, but you got to stay close to me i don't want something weirder than that blue thing taking you away from me. We aren't use to out here. There could be dangerous things out here."

Papyrus nodded and clung close.

Sans frowned rubbing Papyrus's head. "Sorry, i didn't mean to scare you. Don't worry i'll protect you. Here..." Sans knew it would use up his energy faster, but he lit up his left socket. Blue magic shined out lighting up the path before them. "There. You feel better?"

Papyrus nodded "you won't get tired?" He asked

Sans smiled shaking his head "nah, don't worry about me Pap. now let's get going we need to find this friend before it gets too late other wise we are going to have to find somewhere dry to stay the night and it's looking like this place is really wet."

Papyrus nodded "Didn't the doctor say his name?" He asked

Sans nodded "yeah what was it again… Guybo? Grillsby? Grilbert? Something like that. You probably remember better than i do bro. What was he again some fire man? Shouldn't be that hard to find in a place with snow."

"Oh! Grillby!" Papyrus said "and yeah! A fire man!" He said

Sans nodded "See Pap you're so smart i would have never remembered that."

"Yes you could have" he said "you very smart!"

Sans chuckled rubbing his skull "only cause i'm older. You'll probably be smarter than me soon. Even smarter than Gas-..." Sans stopped walking his eye dimming.

Papyrus dimmed a moment too before shaking his head "Nyeh heh heh you're funny he always said you were the smart one and I was just passionate" he giggled watching as the scene changed and they were suddenly surrounded by glowing crystals and he gasped "they are so pretty!"

Sans gave a sad smile catching up with his brother "woah... This is amazing..."

Papyrus tried to reach for one and cried out as he fell in a large puddle instead

Shocked out of his daze Sans rushed over helping Papyrus up and looking him over "you okay Pap?"

Papyrus nodded and hugged this brother getting them both wet "yes, but it was scary" he said crying.

Sans frowned pulling him close rubbing his skull cooing "shh it's okay bro. I got you Pap. i'm not gonna let anything hurt you. I'll protect you. Don't worry. I got you. You're safe."

Paps nodded and hugged him sniffling "thank you..."

Sans smiled "anytime Pap. here want me to carry you?"

Papyrus shook his head and just held his hand "we'll be faster this way..." He said wanting to find the snowland

Sans smiled clanking his teeth to Papyrus's skull. "Heh so brave bro."

Papyrus clanked back "y-yeah!" He said and kept in looking at all the pretty crystal.

Sans smiled "you want one?"

"Um... Yeah... It's really pretty..." He said

Sans smiled "well i can't disappoint my little Pappy heh." Standing back concentrating hard, his socket started to glow brighter. The with a POP a small floating canine looking skull appeared.

"Heh sweet it worked!" raising his arm Sans pointed to a collection of crystals, the skulls mawl opening a blue energy forming. BURRR the energy grew brighter and brighter before a beam shot out striking the wall with a loud BOOM. small shatters of crystals rained down. The small skull quickly floated over protecting the two from the crystal rain.

With a groan Sans slumped against a wall. the skull disappeared with a POP as the blue dimmed and disappeared from Sans's socket.

Papyrus watched in awe "Sans! That was amazing!" he said and turned to his brother gasping "Sans?! Sans sans! Wake up!" He said going to him and shaking him worriedly

Sans gave a groan cracking open his sockets completely exhausted. "Don't worry Pap 'm fine. Just tired. Pick ya out a good one. I just need to rest a bit. Maybe we can stay here tonight. Kay?"

Papyrus frowned "okay brother..." He said and began looking while his brother rested

Sans practically collapsed on the floor soon giving small snores where he slept.

Papyrus let him sleep as he looked for four perfect crystals.

Sans continued sleeping, drool seeping onto his chin. "Mmhm pap."

Once Pap found them he curled up next to Sans cuddling the other close.