This story was inspired on her king papyrus comic by nyublackneko on tumblr. The head cannon and Au belongs to them. I'm just inspired to write a story about it.

" Hey kid, I hope life is great for you. everyone down here is pretty much the same. Toriel refused the offer to be the queen when asked. She said she was happier taking care of The Ruins. Undyne blames you for Asgores death you know. Undyne said she will avenge him by hunting you down and killing you when the day comes and we make it to the surface. One other thing, Since Toriel refused to be queen, Papyrus nominated himself to be king, I also did put in a good word for him as did everyone who knew him. I have never seen him so happy. well I have to talk to you soon kid. " Sans hung up the phone and sighed, he called the kid every day, and left a message hoping one day they would return the call.

" Hey Sans?" Sans turned around to see Alphys standing by the door of his lab, since Papyrus became king he made Sans the 2nd royal scientist with Alphys since he knew Sans liked science.

" whats up Alph?"

"its Pap- I mean King Papyrus, he needs to speak with you about something...he sounded really dishearten." Sans soul ran cold, what in the world could make Papyrus that upset. he thought to himself.

" Thanks Alphys." Sans walked right past her and took a short cut to wind up right outside the back of the throne room. Sans put on his fake smile and entered the throne room. " Hey pap, Alphys told me you called is-" Sans stopped in his tracks. He didn't even need to see Papyrus to know something was wrong. the aura of the room was deathly still.

" A human fell through today..."

" Really is-"

" No sans, it is not the same one as before...the monsters. Every one. They want me to restart and finish what Asgore started..." Sans heart sunk, and felt like it hit the bottom of this non existing stomach. He could feel the magic in him start to resonate, as his eye started to glow slightly blue. " No puzzles, no judgment, just execution...I don't know what to do Sans...what do I do? can I really sacrifice the happiness and freedom of all Monsters? Can I Sacrifice the only wish they have...for the first time in really long time Sans...I saw hope in their eyes. Can I really take that away? just so a single human child can live? I don't know if I could even kill something...I don't know if I could ever live with the guilt...If I don't I will make everyone upset...I will make them question my loyalty because I put a human...before monsters. Why must this decision be so HARD SANS!" Papyrus said crying.

Sans stood there, slowly trying to process everything his younger brother just said. never had he heard brother talk in such away. Sans eyes was glowing brighter as a blue flame emitted from his eye socket surrounding his cyan eye. His emotions were in such turmoil. " Sans?" Papyrus questioned since his brother was so silent. Something cracked inside of sans. He had a plan, a plan in which everyone will win. Sans knew this plan would sacrifice every moral he had, every absolute resolve he ever held on to. For the first time in a very long time he felt Determination. His eye stopped glowing and his eyes went blank. he spoke up finally.

"Papyrus...everything will work out... you have to trust me though. I have a plan...but, Papyrus can you make me a promise."

" Of Course Sans,what is it?" he said getting up and moved behind the throne to look at his brother. Sans looked up at his younger brother looking so regal you could barely tell it was the same go lucky Skeleton he was months go " Papyrus promise me. That no matter what happens. You will never stop smiling and being happy. Can you do that?"

" Of course I can sans, you have my word." Sans walked up to his brother and hugged him tightly.

" don't worry bro, I promise everything will be fine." Sans said letting go. "I have some left over paper work to finish up, I will probably spend the night in the lab. I will see you tomorrow okay?"

" Sure Sans, have a good night." Sans smiled and walked out of the throne room. he sunk into an corridor and cried. He knew the plan he made, was dangerous. If papyrus was to ever find out he didn't know what would happen. but he knew this is the only way everyone will be happy. Even if it meant pushing aside and throwing away his own happiness.

" As long as Papyrus is happy, I am happy, as long as papyrus is smiling I can smile. As long as papyrus is king as his brother, I will always be by his side and help him." Sans got up, the sadness now turned into raw Determination. his eyes blank, he took a short cut back to the True Lab.

meanwhile back at the lab Alphys and Undyne were watching some random magical girl Anime that Undyne found patrolling the trash dump earlier today. when suddenly the alarm sounded. which startled both girls. "Thats odd. That's coming from the True Lab." Alphys hurried over to the giant computer she used to watch the entire underground. she brought up the True Lab cameras on the big screen. She saw Sans turning off the alarm.

" Sans? what on earth is he doing in there?" Undyne questioned. Alphys had a sinking feeling something wasn't right.

" Hey Undyne, lets go check on him. I don't like the feeling I have..." The two girls walked over to the elevator that led to the lab and entered it.

Down in the lab Sans was walking around. The place smell wretched the pipes were rusted ,and leaking water, and god knows what else. Lucky for him the Amalgamates were all sleeping so he wouldn't have to deal with them. he stumbled around until he found the room he was looking for. He looked up at the deactivated goat/ Dragon skull looking Machine with wires of all different colors and tubes connected to it. quite frankly it was scary to look at. Sans walked over to the control panel and dusted it off everything looked like it was fine, he input the code that he remembered the previous royal scientist gave him. encase one day he needed to use it. After a few seconds the machine sprung to life, Sans smiled, when he heard someone behind him. " Sans what are you doing?! the fuck is that thing!" Undyne yelled. Sans turned around his eyes blank

" This is a soul compressor. It compresses and stores souls so they won't get damage or dissipate once they leave the body. The previous Scientist W.D Gaster made this...back when we were harvesting the souls of humans who fell down here. "

" Sans why would you reactivate that thing? "

" A human fell down today...Everyone wants papyrus to kill it...and take its soul...you see though, I will not let Papyrus carry that burden, or commit that sin. I will do it for him...I will carry that burden, I will carry that sin, I will carry the guilt. I will kill for Papyrus, I will sacrifice my morals and resolve for Papyrus, I will sacrifice my all for my brother..." Sans left eye was glowing bright blue. It honestly freaked out the girls, never had they seen Sans like this, the guy was usually cracking horrible puns and being lazy. Never had they seen the older skeleton brother determined.

" Sans this is really bad idea...What would papyrus would say about this? that your going to commit horrible acts in his name? He would be devastated Sans. This won't make your brother happy."

" It will...he will not know about it...I'm going to warn you two...If you tell Papyrus about my plan...Well to say the least you both are going to have really bad time. have my word girls?"

" Yes..." Alphys sadly said. Undyne nodded.

" Great! I will see you all later, I have something to take care of." Sans eyes went back to normal and he smiled walking past the two girls and took a short cut out of the room.

" Undyne we have to tell Papyrus...I'm not going to let Sans kill..."

" Alphys, do you really think Sans would do something like that? Would he really kill?"

" I don't know...I have never seen him that serious...or Determined...if a monster has hat much Determination. I really don't know what would happen. But. king Pa-"

"I know you want to, I want to as well, not telling him is going against my morals. but seeing Sans like that is nerve wracking,I have trained with papyrus, he is very strong, almost as strong as me. I know sans lazy but seeing him like that I can tell hes not weak. I can tell by looking into that eye of his. his magic and soul is as stronger than papyrus's. his soul is as strong as mine if not stronger. Adding his Determination to kill for Papyrus in the mix. is something I don't want to see if we betray him. I had no idea sans was the type who would Sacrifice everything for his brother."

" neither did I...but your right...Sans is dangerous right now, I don't want to cross him,but its not right not to."

" I know Alphys...I know. but for Papyrus's sake and his we must keep silent." Alphys sighed and hugged her.

" I'm scared Undyne." Alphys said starting to cry.

" I know as am I..." Undyne held on to Alphys. she was determined to keep papyrus in the dark for the sake of Alphys, the underground, herself, Papyrus and Sans.