Flashbacks of past experiments echoed in the back of Alphys' mind as she walked into the lab after her wife. It should have been empty and dark, just as she had left it, but it wasn't. Instead, the lights were on, and the electricity was humming through the air.

Every trace of Alphys was gone. New furniture was placed throughout the room, the walls barren of any of her posters. Of course they were gone, she took most of them to the surface. Alphys had just left the stuff she wouldn't need, like her copies of anime.

Different experiments and items littered nearby tables, most of which Alphys could never recall ever owning. This wasn't her lab anymore, she had left it like she did the underground. It wasn't her property anymore, Sans had taken advantage of that.

Alphys picked up a nearby piece of paper, looking over the calculations. Sans had always been smart, but these...

These were on the next level.

More papers were grabbed by the lizard monster as she looked at the writing in awe. These were likely what Silky had talked about, the void. But the papers varied, not all of them were just about the void. Some were on the core, blueprints laying out upgrades to make it self functioning. There were designs for new machines, and calculations for different types of weapons. Some papers even contained recipes for different types of foods, theorizing what food items could be replaced by human organs and other things. Likely for Addy.

Instead of her anime posters, simple lined pieces of paper now were scattered around the walls. Looking at them, Alphys found random drawings. Some of them looked like they were drawn by younger kids, with stick figures of some people Alphys didn't recognize. There was a weird symbol on a lot of them, along with the repeating image of a tall man with a white face and tie. It seemed to be prominent theme of most of the more childish looking drawings, the tall man and symbol appearing in most of them. Some were more creepy looking, but others had him standing next to drawings that looked like Sans and hooded people, doing other things. One picture even depicted him wearing a pink apron.

"Are these drawn b-by you?" Alphys asked Addy, pointing to the nearest picture.

Addy shook her head, looking to the side at the pictures.

"By your siblings t-then?" Alphys asked.

This time, she nodded. Addy walked up to the wall and pulled down a drawing Alphys hadn't seen, turning to give it to Alphys.

It was a bigger picture, with a lot of people drawn onto the paper. There was a giant heart surrounding them all, with the words 'Happy Father's Day!' written on the bottom.

"Did... y-you draw your family?" Alphys asked.

"Mhm!" Addy hummed, nodding before she tugged on Undyne's hand.

Undyne glanced over and leaned down, Addy cupping her hands around her teeth before she whispered something into Undyne's ear.

"She said it's not done, because... because she found some new family she'll have to add to the picture." Undyne repeated.

Alphys glanced at Papyrus. The skeleton looked like he was practically glowing from his smile.

Oh, that was adorable. It was the first time Papyrus had smiled like that in a long time.

They ended up moving towards the elevator in Alphys' lab, Addy gesturing for them to follow her. It was the same as Alphys remembered it, the button to the basement taunting her memories of her mistakes. Her girlfriend took notice of Alphys' unease, looking at her.

"You alright? We can stand outside if you want," Undyne said, "Papyrus can tell us later."

"I-I'm... no, no, I'm good," Alphys said, pulling at her sweater.

Instead of reaching for any of the current buttons, Addy instead put her hand against the wall below the two current buttons on the wall. Her fingers dug into the wall for a moment before pulling back, bringing the wall with her.

There was another button below it.

No, that couldn't be. Alphys knew the lab front and back, there shouldn't be another floor. There was only two floors, the true lab and the top lab. There wasn't a third one.

"I-I don't..." Alphys stuttered.

Undyne looked at her. "I thought there was only two floors."

"There should b-be!" Alphys stuttered.

Papyrus glanced between the two before he took his gaze back to Addy. There was no reaction from him, silence lingering as he lost himself into his thoughts.

The young girl looked back at the three for a moment before pressing the button, the elevator starting to hum as it traveled downwards past the second floor.

There was a beep as everyone froze, watching the doors slowly slide open. A large, barren grey hallway waited for them on the other side.

"What is this?" Undyne asked Addy.

Instead of a response, she instead opted for the use of actions to display her intentions by walking forward. It felt a little difficult to walk out of the elevator, memories of her mistakes tainting her mind.

But this had nothing to do with her. Her mistakes from before were accounted for, Alphys had told everyone what she had done. This wasn't dealing with the experiments she preformed.

The footsteps behind her ceased, Alphys turning around. There stood Papyrus, his skull turned as he looked at a door to his left. There was a name on the door.

'Papyrus'

Of course the skeleton walked towards it, carefully pushing the door open. After all, why would a door in a lab say his name?

Alphys quickly followed him, the other two females noticing the two and going towards the door as well. Papyrus stood in the doorway, simply staring into the room with a silent and analyzing gaze.

It was empty. Just as the hallways were, with barren walls lacking any decorations. There was a single piece of furniture to give the room life, and even that was simply white. The baby carriage was old, extremely old, one of the legs broken from age to tilt it at an angle. The entire room was filled with dust, including the baby carriage. A single bone attack lay resting next to the object, it too covered in dust from age. The only place that lacked dust was the area by the door, suggesting that it had been opened after dust had formed.

"Why did it say my name? Is this..." Papyrus trailed off, looking over at Addy. "Was I born here?"

The girl glanced to the side, nodding slightly.

"Did Sans tell you that?"

Another nod.

Alphys looked back at the carriage in wonder now, eyes wide behind her thick glasses. This was where Papyrus grew up? In a small, cold room underneath a lab? In that small, uncomfortable baby carriage?

"Do you remember this at all?" Undyne asked, turning to Papyrus. "Do you remember anything about this?"

"No, I don't," Papyrus admitted, shaking his head. "I never actually knew where I was born, I just knew that Sans and I had moved into Snowdin when I was just a baby."

"That would explain the baby carriage, you probably didn't stay in this room for long," Undyne said.

"B-But why would Papyrus live i-in a hidden lab?" Alphys pointed out.

It didn't make sense. Why would there be a hidden button to a secret lab? Why would that level of secrecy be used by the previous Royal Scientist to hide a lab? And why would Papyrus even be down there?

Wait...

Who was the last Royal Scientist?

Alphys didn't know them. She had never heard about them, only gaining her knowledge of their studies and creations from what was left for her. The core and the determination machine, and the intentions behind those creations. The persons name remained blank, unknown from the documents.

None of this made any sense. How would this even tie in with Sans being a Creepypasta? Did he live down here too?

There was too many questions, each question bringing an onslaught of new ones that had yet to be answered.

Addy waved her hands to get their attention, backing out of the doorway before she pointed down the hall. They had more to see.

There was a few more rooms, one of them even labeled 'Sans'. It looked just like Papyrus' room, except for the baby carriage was absent, and there was a key shoved into the keyhole of the room from the inside. Had he been locked inside?

The other few rooms contained more evidence of a scientist being down there. Machines Alphys couldn't recognize were broken down, torn apart and destroyed by some sort of magical attack. There were burned and torn apart notes scattered across the floor, destroyed so much that the calculations were unreadable. A few saved words Alphys could find were written in some sort of font she couldn't translate, and even then it was a few select pieces of information that would prove useless if she did manage to translate them. Whoever destroyed the notes made it so they couldn't be used, and they had succeeded. There was a railing on the left side of the room, piping going down past directly towards the core itself. This was probably where the heart of the core was.

The most horrifying thing was the machine in the last room.

It didn't look like the others. Needles and vials stuck out in random places, straps adjusted to the table. The machine looked more like a twisted abomination due to the damage inflicted upon the machine. However, even with the destroyed metal, she could still tell it wasn't a machine of good intent. The straps on the table and the gag proved just that, along with the vials with tints of red droplets of determination staining the glass.

This machine was meant to hurt people. Badly.

The machine didn't seem to be the focus of Addy's attention. Instead, the skeleton girl walked past that to a filing cabinet in the corner, pulling back a drawer before reaching inside for an object. She then produced out a disc, holding the small object between her fingers as she moved to a nearby monitor on a desk.

"What's that?" Undyne asked.

Addy didn't answer, as expected. Instead, she pressed a button that opened a slot before sliding the disc inside. The screen came to life at that moment, displaying a video.

There was a man, one Alphys couldn't see. His face was glitched out, in fact, his entire body was. Every part of his body that wasn't clothing was covered in glitches, as if he himself were the cause of it. His clothing, however, wasn't. Alphys could see the lab coat and the black pants, suggesting he was a scientist.

The original Royal Scientist.

He moved, the glitches perfectly following his body as if they originated from his body.

"Entry #1." His voice was jumbled, glitched and uneven with words. "I will not be stating my previous studies, as they had been documented in their folders accordingly. This disc will be observing the physical reactions of the subject who had become resistant to determination, nothing more. This is simply for documentation of physical responses to each test, the research and amounts itself will be contained, once again, in the correct files accordingly. Subject has been administered three doses previous."

The man then moved, showing the same machine as in the room. That machine was more in shape, however, more kept and cleaned than the one currently sitting behind them. The vials were filled to the brim with determination, the substance lightly glowing.

"Although the King had rejected my research on live test subjects, I will continue to persist through making my own test subjects through scientific means. King Asgore is not aware that I have created this subject. The test subject will live only for scientific research and experiments, it serves no purpose other than that. Thus why I must keep its presence unknown to other monsters, as they would object to the study upon his body simply because he is young. I did attempt to gain its approval to the testing, as it would make experiments easier. However, due to the nature of this experiment, the pain received from the injection of pure determination erases all attempts to gain its willingness to experiment. And due to my objection to calling the subject a child, nethertheless my child, the subject remains disproving of both myself and the experiments. Thus, more dramatic measures must be taken to ensure participation." The man moved again, writing something down onto a nearby paper. "This includes both physical and mental means of degradation and harm, as long as physical constraints to prevent struggle and escape. A necessary procedure for injecting determination into the subject."

Alphys' head spun as she listened to everything the man said. Asgore was never aware of this? That would explain the hidden room; the experiments were illegal. It had to deal with determination, a dangerous substance that could kill any monster. The only reason Alphys herself got permission to test on monsters was because they were already on the verge of death, they had nothing to lose. It had been a last ditch effort to save them, nothing more.

"Test subject...?" Undyne muttered, "This guy f*cking was experimenting on a kid in secret? No wonder he had to come to some creepy basement to do it, that's wrong! And he knew it!"

"He said it was painful, he... he was doing that to a child and it hurt them..." Papyrus whispered, "He had to use force to force them to do it..."

Addy stayed silent, watching the group silently. The disc had likely already been seen by her, she already knew what was on it. But why would she show them this?

There were only two rooms down there...

Both of them had names labeled onto them...

The rooms looked like holding rooms for prisoners...

Alphys suddenly pieced it together within her mind, mouth dropping with the weight of the shock. No. This man couldn't have, but the pieces were all there. If he was hiding subjects from the King, he would likely hide them down on this exact floor.

The exact floor where two rooms were on.

The exact floor where Papyrus had been born.

"Subject #1, also referred to as 'Sans', please come forward."

That single line made everyone's souls drop.

Just like that, Sans was walking onto screen, but he looked different. Younger, barely even a child. With a small body, big eye sockets that stared in utter horror at the machine. He was wearing a thin green dress that went down to his knees, one that took on the design of a hospital gown.

"Sans...?" Papyrus' voice was quiet, shaking with surprise.

"I don't wanna go on that again," Sans said on the video, hugging his small arms against his chest.

"Get onto the machine, Sans."

The younger Sans was obviously terrified of the machine, while the man lacked any empathy for the young skeleton. He instead reached for Sans, who jerked away fearfully from the mans touch.

Alphys had never seen that look on his face. It wasn't the one of sorrow he gave them before, or the look of anger and satisfaction of revenge from the hospital. It was one of fear, eye sockets wide as his bones started shaking.

Sans was terrified of the man.

Sans had been the experiment with the determination.

The world started to spin as Alphys felt her soul fill with utter disgust at the scientist, knowing he was intentionally causing Sans harm and fear just for experiments. As a scientist herself, she knew not to do that. Hurting people wasn't worth the knowledge, it never was.

"Can you at least lower the dosage?" Sans asked on the video, drawing her attention towards it once again.

"No." The man had no remorse, instead using the straps to trap Sans down against the table.

"Can... Can I please be allowed to cry?"

"No."

Alphys gasped, pressing a hand against her mouth from shock. He was asking permission to cry, as if it wasn't allowed. Why would this man even say Sans couldn't cry?

"This guy is f*cking sick," Undyne hissed out.

Papyrus remained silent, staring with wide eye sockets at the screen. His hands trembled.

"Do you r-remember any of this?" Alphys asked him.

"... No," Papyrus said, not looking away. "But this... Sans shouldn't have to ask... he... had to ask, and the man said no... this shouldn't be happening..."

Addy watched Papyrus, glancing back at the screen.

"I am about to insert the determination," The scientist said, drawing their attention once more. "No objects will be given to the subject to prohibit the likeliness of that object interfering with the results. Items like stress balls for pain or gags for screams will not be used."

Suddenly, Addy's hand was on the keyboard, clicking on a button to start skipping through the video. Undyne reached for her but stopped, drawing her hand back after a moment of hesitation. There was probably a reason why Addy was skipping through the next part.

And Alphys saw why. Due to the video being sped up, they couldn't hear any sound from the disc anymore, but they could still see the picture. The needles had pierced Sans, the scientist standing in the background with a folder in hand, writing down things.

On the video, once the needles had injected Sans, he started flailing. Eye sockets wide as his teeth were pulled open, body shaking violently as he fought against his constraints to try and distance himself from the needles. Since it was sped up, his screaming and flailing looked even faster, only enhancing just how desperate he was to stop the pain.

Suddenly, he slumped against the table, going limp. The scientist could be seen walking around the table before Addy played it at normal speed, resuming the video.

"-And has passed out from the pain, such as he did the previous two experiments," The man was saying, clicking his pen closed. "Screaming remained just as usual, and subject was unable to hold back crying. However, he did stay awake longer than before, showing that he is developing a slight resistance to pain. That type of development would be good for an object of war. I will focus on increasing the pain next experiment to develop that further."

"He's making it hurt on purpose, he was training Sans to be a weapon!" Undyne growled.

Alphys couldn't respond, her voice having left her. How did Sans not melt? That was a lot of determination, that would have killed any other monster. Alphys had expected him to somehow break free, but he hadn't. His body had took the determination, he shouldn't have survived.

And the scientist was absolutely disgusting with his attitude. He wasn't just experimenting on Sans, he had been working on turning him into a weapon to use against humans. The man didn't care about Sans in the slightest, just treating him as some test subject with no emotions.

"Entry #1 summary," He said, approaching the camera. "Subject has passed out, but will be trained further to grow resistance to pain. It will also be punished for crying, so the increased pain will serve for double purposes. Subject will need to learn resistance to emotions and how to hide them if it serves in a future war, to prevent exploiting of said emotions."

The screen then went black for a moment before cutting to the next clip, barely allowing the three to process the information before moving onto the next entry. Addy once again started to skip through, likely just wanting to show them the important parts.

The group watched as a few entries came and went, each depicting a usual cycle. The glitched scientist would stand and speak before Sans would enter, climbing onto the machine and being strapped down before he would be forced to take determination. At this point, he had already long exceeded the amount of determination Alphys had ever tested with, so she had no idea what this would leave to.

"Entry #46." The man was standing in front of the camera. "Subjects dosage has been increased again. Subject has requested pillow for head when experimenting; the request is pending at the moment. Subject has shown incredible improvement in their ability to hide and manipulate their shown emotions, at a speed above average. This was unpredicted, but origin of subject can give explanation into this. The origin of how I created the subject, however, is not disclosed within documents. This information will not be disclosed anywhere, as the means to create life may be discovered and lead to the ceasing of current experiments. Thus, the information is not disclosed within any forms and will not be in future entries. However, it does impact current experiments and may impact lower due to his creation within the lab itself. I may have to create a second life form with more solid procedures to secure better experimentation. Subject 1 will remain tested on, even if I do create a second subject. The second subject will serve as more of a control to see if my hypothesis is correct. As of now, I will retain my one subject and continue normal experimentation."

"I-I hate him," Papyrus spat out, voice trembling. "I hate him so much. He's not a monster, he's just evil."

"We're right there with you," Undyne said.

Once again, Addy skipped through the video. This time, Alphys had caught on why, glancing at Addy. Not only was Addy showing them the important parts, she was skipping over the actual experiments. Not for their benefit, but for her own.

That was her Dad, on there, being tortured until he screamed and cried. Addy probably hated listening to that. That was understandable, Alphys probably wouldn't be able to stomach her lunch if they listened to that.

"Entry #107," The scientist said, "Subject has complete control over their visual expression of emotions. They are able to maintain a constant smile even during extreme pain and are growing resistant. Subject is able to fake emotions at an upmost perfect level of deception that creates their mood unpredictable. I have grown unable to tell what they are feeling unless inflecting large amounts of pain upon their body, and even during those times the subject is able to maintain a smile for a long duration of time. I am growing to believe this origin of their abnormal abilities to study and manipulate others around them are the side effect from their creation within a lab. The aspect of only myself being near them their entire existence can be a supporting factor, as they may have studied my behaviors and learned how to manipulate their emotions around me. I do believe I have no choice but to create a second life form as a control subject, with less influence from what the original subject has. The subjects creation may interfere greatly with experimentation, as they seem to exhibit abilities from their creation. The next subject will be the control to see if they have the same signs as the first. However, the first subject still shows promising signs as a weapon of war. Subject is able to summon large attacks of mass and has already shown signs of possibly bypassing the King himself with his magic. I will increase dosage again of the determination to make them more powerful."

Addy skipped through more entries after that, skipping through experiment after experiment of pain and torture inflicted upon Sans. It was horrifying to watch at this point, as Sans was smiling throughout each one. Tears still rolled down his cheeks, and he still shook from pain, but a large smile was plastered on his mouth during each injection. Why Sans was smiling was lost on Alphys, as he was still obviously in pain. But he persisted, keeping a large smile on his face with each experiment.

"Entry #138 summary," The scientist said, "Subject #2 has been showing healthy signs of growth, and are currently being confined from Subject #1. He is unaware of their current existence, as I cannot predict how they will react to the life of another subject. It may cause him to lose control from anger, which would likely result in the death of myself. On the other hand, it may grow attached to the other subject and thus interfere with current experiments. This decision to keep the two apart will last indefinitely. I will proceed with normal experimentations of determination with Subject #1, and continue with monitoring of Subject #2 as of now. I do plan to further increase the determination injection, as a certain... deadline is approaching in a few days. If I could harness the power of Subject #1 to use when that deadline arrives, I may be able to bypass a future incident and continue my research furthermore. It had been my original intention from the start, and if I can increase the determination dosages to daily, Subject #1 may be able to pose a threat."

"Was he going to overthrow Asgore?" Undyne asked.

"I... I could believe it," Papyrus mumbled.

"Subject 1," The scientist called out off camera. "You may enter the room again."

"I still don't get why you kick me out whenever you do your work, I have literally no one but you to talk to," Sans said, walking into the room and into view of the camera. "It's not like I could tell anyone else."

"The knowledge isn't for you," The man said, "I need you to demonstrate your powers to the camera."

"Nah," Sans said, leaning against a table.

"That isn't for debate, do it," The man growled.

"Hm, no."

The change from before was obvious, Sans just seemed indifferent on the threats now, able to bounce back every intimidation contact by the scientist with a smile. It seemed as if Sans wasn't scared of him anymore, as if he suddenly gained confidence.

But that was how he looked. Alphys didn't know how he truly felt. It was unlikely Sans managed to suddenly overcome his fear of the scientist when the experiments obviously became more painful.

What had changed was what Sans displayed.

The scientist grabbed his arm and looked down at some notes, muttering light, unintelligible words to himself. Sans glanced to the table he had been leaning against before looking up at the scientist, keeping his head focused on him as his hand reached for an object on the table. Sans then pocketed a small key, keeping his smile consistent and hiding his movement by using his body.

The key looked like the same one in the door, down the hallway.

"The next dosage will have increased determination as a punishment for your misbehavior," The scientist said, dragging Sans off camera.

Addy started skipping through again, however, she only skipped through a few minutes before the scientist appeared within the room again. After he did, Addy started skipping and playing, switching between the two. She was looking for a specific part.

The scientist was hunched over a table, working on some papers while mumbling to himself. He seemed a little desperate, a few words catching the camera about how he was running out of time.

"-Might not be able to fight..." He had been mumbling.

Sans came into view.

He crept into the room, body more lower to the floor. His smile that had been on before was gone, leaving a determined look of pure blood lust on his face. A bone was summoned in his hand, his pace slow and calculated. The scientists didn't look up or react, as Sans made no sounds to indicate he was there.

The scientist probably didn't know he was there. Sans wasn't going to just go for a scare, he was going to kill him!

That shouldn't surprise Alphys. After what she had saw from those entries, it was obvious the man deserved it. He did nothing but hurt Sans his entire life, judging by how Sans had been born down there. But still, it send a shiver down her spine knowing what Sans was about to do. He was so young in the camera, just a small child that shouldn't have ever been involved with this type of experiments.

Sans pressed forward before he was right behind the scientist, hands stilling as his eye lights focused on the back.

That's when he attacked.

It was sudden and fast, a quick and pinpointed attack straight into the back of his ribcage. The attack was on the next level, one that wouldn't be seen from a child. When the scientist screamed and fell down, Sans was already on him, attacks summoning rapidly as he let loose on the man.

There was no hope for him. Sans had determination on his side, along with the hatred that everyone watching possessed as well. The scientist managed to kick Sans off of him and stumble backwards onto his feet, but it seemed as if Sans already predicted it. He was already weakened from the attacks, so the scientist only managed to stumble up before Sans was shoving him backwards against the railing with another bone in hand, directly piercing his chest.

That was a deadly blow. Even Alphys knew if the man wasn't healed soon, he wouldn't have made it.

Sans didn't seem to care that he already had landed a good hit, his body hands reached forward to shove the scientist backwards. His injured body complied with the force of Sans, making him tumble back over the railing.

And he fell directly into the core.

The group watched in silence as Sans stared down over the railing, blood staining his clothing as the scientist screamed from fear and pain on the way down. The room suddenly shook violently for a moment before everything stilled, the mans screams cutting off.

Just like that, he was gone.

Sans turned back, blood staining a part of his small skull as he walked towards the camera, hand reaching forward. Not a single glance was even given to acknowledge the fact that the camera was recording him, his gaze instead focused on turning off the camera.

The screen went black shortly after, leaving the group standing in silence with the now empty screen taunting them.

They had a lot of information to process.

《》《》《》

You guys remember how I mentioned the last chapter was supposed to be long?

Nah, it was this one. 

Also, this isn't edited so hopefully I made no mistakes!