AMS

UNDERFELL SANS

Brent, Fuku, and Frisk stayed after class just like Sans had asked them to. They weren't sure what was going to happen, but they prepared themselves for the worst. Sans sat down at his desk, picked up the pile of schoolwork the students turned in and knocked it against the desk to straighten out the papers into a neat pile. After they were straightened out, he carefully set them back down, slowly looked up at three of his students that sat before him nervously, and pushed his fake glasses up on his face, then neatly folded his hands together.

"Now that you two know the truth about what Frisk had done in another timeline, how do you feel about her? How do you feel about being her friend for a while now and she has kept this part of herself from you? Does it bother you at all?" Sans asked calmly.

Brent and Fuku exchanged glances before speaking.

"It was the past. Everyone keeps secrets from people for a while before they feel they can trust the person with their secret anyway. I personally don't judge her for what she was forced to do," said Brent.

"The same goes for me. She stayed and helped Naomi when she didn't have to, and she has been helping me with my restaurant. Not only that, but she has helped Brent escape from Naomi. She saved, so if Naomi doesn't get better after two years, she's going to load to personally bust her out of there," said Fuku.

"It is true that by the end of her genocide she was being controlled by Chara. But do you guys know how reincarnation works?" asked Sans.

"No not really," admitted Brent and Fuku.

"In order for a spirit to even take over, the host who is still in control has to give the spirit power to be able to take control. When Frisk started killing innocent monsters, it was her own doing. Did Chara manipulate her? I don't doubt it for a second. But I wanted you both to know the full story before you decided on how you felt about it. After she killed my brother, that was when Chara was slightly starting to take over. You could tell because her normally brown eyes would flash red during battles," explained Sans.

Brent and Fuku now did not know how to feel, though they still believed they should trust Frisk since for five years she has done nothing wrong and helped Chara's spirit rest.

"Frisk, you never told me why you started killing to begin with. The genocide was a one time thing, but to this day it...perplexes me to say the least," said Sans.

Frisk looked troubled.

"W-well, after trying to get past Omega Flowey so many times and failing, I had some resentment towards the monsters since I felt it was all the monster's fault for keeping me from seeing my family again. When I started to have darkness in my heart, that's when Chara talked me into the genocide. He told me if I killed them, I would gain enough power to get rid of Omega Flowey. I took the bait and began killing to power myself up for the fight to get home. But I didn't know what the consequences would be. All I thought was I was killing a race that was keeping me from getting home. I didn't see the wrong in what I was doing until it was over. I wasn't home in the end. I was trapped in a void. So I begged Chara into letting me try one more time. I felt the key to me getting home would be to try to save the monsters as well. A few times I tried, I didn't think of reaching out to Alphys. So I died to Omega Flowey countless times. Then, Undyne called me to deliver a letter. Long story short, I died countless times to the reincarnation of Asriel Dreemurr countless times before I gave up and decided to live underground for the rest of my life. At first I tolerated living down here, but then I learned to love and respect the monsters," said Frisk.

Sans was surprised at everything Frisk had gone through mentally. He knew physically since he spied on her a lot. But because she always had a poker face, he couldn't tell that her determination faltered at times. Brent and Fuku hugged Frisk. They definitely knew they could trust her. In the corner of the room, a portal opened and a short skeleton who looked similar to Sans fell through, like he was thrown out. Sans got up and went towards him slowly.

"Who are you and where did you come from?" asked Sans.

The skeleton looked up at Sans and scowled.

"I'm you, but from a dangerous universe. The Frisk where I'm from went missing years ago, so I asked Error to help me locate her. He said she's in this timeline, but if that's Frisk over there, then she looks completely different from mine since mine is 10 years old and has short hair," said Underfell Sans.

The Sanses looked over at Frisk, who looked petrified to see UF Sans.

"Frisk? Are you not from this universe?" asked Sans.

Something did change about Frisk when she was 10. When she first came, she was overly afraid of everything and nearly had a heart attack when Sans greeted her. But a few times after her being scared she somehow became more lively in a sense where she wasn't a scaredy cat anymore. She smiled more and was vocal. She had more determination. Frisk sighed.

"I am not from this universe. I came from Underfell. It's an alternate universe from this one, the one that's called Undertale. Trust me when I say it is completely different and in a bad way. Though it is not as bad as Underlust," said Frisk.

Sans couldn't believe what he was hearing.

"I started falling for Frisk when she became more outgoing. I thought my Frisk came out of her shell because she felt the same way about me. It was all a lie! I don't love this Frisk at all," thought Sans.

His eye glowed menacingly and he grabbed Frisk's arm roughly. Frisk stared back at Sans fearfully.

"What did you do to the love of my life?!" Sans voice echoed.

"Wai-wai-wa-wai-wait. You fell in love with your Frisk? She was a child right? And you're an adult!" smirked UF Sans.

"Shut it Yellow-Tooth!" shouted Sans.

"I didn't kill her if that's what you're thinking. I sent her to another universe. I promise it's a good one. I sent her to Underfresh. Trust me when I say she is a lot more happier there. I often check on her through a mirror. She's dating Papyrus there," said Frisk.

Then Frisk realized until Sans found that out, she was his love! She blushed a bit, but the painful squeeze on her arm made her think twice.

"Don't you dare blush in front of me. I want you out of my house," growled Sans.

Frisk's face twitched and contorted as she was fighting back tears. Why did her original Sans have to come and ruin everything? Tears flowed freely down her face, she roughly yanked her arm away from Sans, took out a pencil and stabbed herself over and over in the heart. Everyone watched in horror as Frisk sobbed loudly and bled to death. Sans regained his composure and rolled his eyes.

"She killed herself so she can reset. Well, it was nice knowing you guys. I hope I get to meet you both again in another timeline," said Sans.

"Dude. If that was her plan, everything would have been reset by now. I think she loved you back," yawned UF Sans.

Sans turned around and saw her floating red heart. UF Sans was right. If that was her intention, they would have all been brought back 5 years prior. Sans still felt no remorse.

"Either way, she messed up when she got rid of my Frisk," said Sans.

"You're missing the picture dude. Your original Frisk had a thing for your brother, not you. My Frisk loved you. She made sure your Frisk was well taken care of in a good universe, and your brother there loves and takes care of her. You drove the love of your life to commit suicide. Not that I care. I just came here to bring her back to her original universe," shrugged UF Sans.

Suddenly Sans felt something...vague.

"She said your universe is messed up. How is it messed up exactly? Can't be as bad as when she did genocide," asked Sans.

UF Sans laughed loudly. Brent and Fuku could not believe their strong friend just killed herself.

"Oh it's worse than genocide! Toriel tried to kill and eat her, soul and all. I don't know how many times I have managed to trick her into getting killed by my brother or someone else. If it wasn't for her power to reset, load, and save, Asgore would have had her soul long ago and wasted the humans on the surface. I've raped her countless times. Maybe that's why she loves you. Because I was forcefully intimate with her, whereas you, another version of me, was kind to her. Man. You betrayed her. Kudos man. I can use that against her back home to make her do what I want," said UF Sans.

That's when it hit Sans. Hard. He was right. Underfell Frisk was kind enough to not just throw the original Frisk into any universe. She chose a universe where she would be happy...with his brother. Everything Frisk had done, it wasn't just for her sake. Underfell Frisk was so determined, she sacrificed her own well being and sanity for the sake of others! He hid his face in his hands.

"Well, thanks for making it easy for me to just take her home. As a soul, she can't really struggle," said UF Sans.

Before UF Sans knew it, Sans had passed by him in a blur and took Frisk's soul. Then Sans opened a shortcut, grabbed Brent and Fuku, and pulled them through it. The three of them plus Frisk's soul ended up in Sans and Frisk's home.

"Oh what have I done?" Sans asked himself.

Brent and Fuku didn't want Sans to feel bad, yet they didn't want to say anything comforting either since he drove Frisk to kill herself in pure emotional agony. UF Sans made a shortcut to where he thought they went. But to his surprise the house is empty.

"Damn. It's going to take a long time for me to find them! They could be anywhere," UF Sans cursed to himself.

"Frisk, if you can hear me, I am so sorry. Don't reset, but please load your save file. Since I will remember everything, it won't happen again. Just please come back to me," sobbed Sans uncontrollably.

"Frisk please come back. We miss you and we want to help you. You've helped us before. Let us return the favor. Please?" begged Fuku.

Brent wasn't able to say anything as he was crying super hard. Then, Frisk's soul illuminated the room, and her body took over the place of where her soul was.

"Frisk! How'd you come back without needing to load?!" asked Fuku.

"I saw a new option. When you guys spoke to me, it filled me with so much determination that a new option appeared for me. The option was to regenerate," answered Frisk who was surprised herself.

Sans was happy to see her, so happy that he ran up to Frisk, and wrapped his arms around her.

"Frisk I'm so happy you're here. I am so sorry for the things I said to you. You are my one true love and nothing will change my mind," blabbered Sans.

He looked down to look at Frisk, thinking she was looking up at him with a blushing sad face. But to his dismay, she was looking slightly down and turned her head to the side. She had nothing to say to him. He felt his heart break in two.

"F-Frisk?" Sans asked weakly.

He went to turn her head, but she smacked his hand away.

"Fuku, could I live with you?" asked Frisk.

Fuku narrowed her eyes.

"Because I think you and Sans do need some time apart but I know you're just mad at him temporarily, you can stay with me for a month at most," said Fuku.

"I'll pack things for a month then. Thank you," Frisk said monotonously.

Sans wanted to hold her and beg her to stay, but he didn't want to cause a scene. But as he watched her walk to the room, he felt scared. He needed her. So he walked to the room.

"Sans no!" called Fuku.

He didn't hear her. He walked in the room, Frisk was turned away from him, packing her things. He grabbed hold of her.

"Please don't leave Frisk! Please! I can't lose you!" sobbed Sans.

Her tone with what she said to him sounded so low and unforgiving. Like she was disgusted with him.

"Get a hold of yourself. I'm only leaving for one month. I am hurt by the things you said to me. I need time away from you to figure out if I still love you or not. Maybe I do and I'm just really pissed off, or maybe you forced me to realize I actually only felt infatuated because of the darker version of you forcing me to be intimate with him. All I know is I need time," said Frisk.

Sans held her for a little while longer, crying and smelling her hair to remember her scent, then he hesitantly let go and let her finish packing. He felt like crud.

"What are you going to do about the evil Sans lurking around, trying to find you?" asked Brent.

The three of them were at Fuku's house, which was also Grillby's restaurant.

"Chances are he'll be at school tomorrow and he will try to kidnap me back to my original universe. I need to find a weapon and fast. I might have to kill him," said Frisk.

For a second, her eyes flashed red. Chara's soul is resting peacefuly. They flashed red from her spiking determination. They nodded and went to Temmie Village since they always had new stuff that you couldn't find anywhere else. They found a toy knife there.

"Hoi! Welcome to da Tem Shop," said Temmie.

"How much for the toy knife?" asked Frisk.

Brent and Fuku raised an eyebrow.

"You're going to kill a powerful monster with a toy knife? Are you insane?" asked Fuku.

"I have experience killing Sans, though I am not proud of it. I can kill an evil version of him without feeling remorse. He has violated me and cost me my life numerous times by lying to me. He made me believe he wanted to be good but was afraid to be because of his brother. He lied so he could get in my pants and kill me himself," viciously said Frisk.

Brent and Fuku's eyes were wide.

"Da toy knife is 200 money tings," said Temmie.

Frisk handed Temmie 200 gold and got the toy knife.

"Yaya! Temmie finally has enough money for cool leg!"

Temmie left to go to cool leg, but her face was still there, hanging in mid air. The three looked at each other, wondering what just happened. Temmie came back with degree and a college hat on her head. Her face fused back with her body.

"Temmie learned to make new item!"

"Oh yeah? What is it?" asked Frisk.

"Temmie armor! The price is 9999 money things," said Temmie.

"What if I were to somehow keep dying?" asked Frisk.

"I guess then every time you die, I reduce the price," said Temmie.

Frisk smiled. If it was one thing she could count on, it was Temmie's stupidity. Even with the degree, she was still clueless. When Frisk equipped the toy knife, she felt her attack stats raise. It was a familiar feeling that almost brought tears to her eyes as she remembered slaughtering the monsters without a second thought. At the time, she wanted to go home. She left her home because her parents were strict. She'd rather have the lectures than dealing with Underfell. She had tried to leave that universe's underground so many times but could never get past Sans and Papyrus. So when she discovered a fabric in the universe, she opened it and went to Undertale. She saw the Frisk of Undertale was timid and scared of her universe, and offered to take her to a better version. She remembers to this day what that Frisk said. She said nothing, but for the first time ever, smiled up at her and nodded. It's not like she forced Frisk to leave this universe. It was something she wanted herself. Frisk saved.

"Why'd you save?" asked Fuku.

"If I get that Temmie Armor, it'll guarantee my victory with Underfell Sans. All I have to do is purposely die to monsters," said Frisk.

"Frisk, your victory is kinda already guaranteed since you can save and load. You got the weapon, so let's just go. Besides, I want you to tell me how Sans fights," said Brent.

Frisk decided he was right. She wasn't sure if that regeneration option was temporary or if it was a permanent feature. Only time will tell. But she feels comfortable saving when she feels she needs to.

"Alright," said Frisk.

She wasn't sure how she would react to gaining LOVE. The last time she gained LOVE, she became a megalomaniac. She definitely didn't want to have to reset. Her hatred for Underfell Sans showing up grew even more so knowing that if she ends up becoming a megalomaniac due to her killing him, she would have to load. Possibly reset if he keeps showing up. That means that no matter how many times she resets, she would have to continuously reset everytime UF Sans shows up. That did not sit well with her at all. She decides killing him is the only way to rid herself of him forever. If she likes the feeling she gets after killing him too much, she will need to cut herself off from the world of monsters. The only way to do that would be to live in the Ruins again. This was a lot of pressure on her.

"Fuku, I may not be around for a while after I kill evil Sans. If I decide to not come back, for good reasons of course, I will bust out Naomi and take her with me so Brent will stay safe," said Frisk.

Fuku didn't understand what she was talking about, but nodded her head anyway. They went back to Fuku's home and fell asleep. When they went to school, Frisk's hunch was right. Underfell Sans was in the classroom, waiting. The other classmates were in there, wondering who this evil looking version of their teacher was doing there and who he was. Until Sans, their teacher, told them what Frisk was going to do. She had texted Sans last night telling her she was going to kill him and why he was unredeemable. When Sans got done explaining who Underfell Sans was, his motives, and his fate, the class was now rooting for Frisk.

"I wonder how a human fights," said some of the students.

Everyone heard a blip sound a few times, then they saw Frisk's soul in front of her. Options appeared in front of Frisk, and a box formed around her soul. So far, the class was intrigued.

"It's a beautiful day outside, birds are singing, flowers are blooming. On days like these, kids like you, should be tortured to death!" said UF Sans.

Her soul turned blue and he slammed it down. She got it up in time for his next attack. She swung her weapon at him but he dodged.

"Heh, you really think I'm gonna just stand there and take it?"

He sends out his next attack which Frisk for the most part dodges. She lost some health, but nothing fatal. For some reason, Frisk's face was flashing into someone else's face. UT Sans was in disbelief.

"No. He's supposed to have gone to the light," Sans thought.

When Frisk spoke, her voice sounded like a demon was possessing her.

"You think you have a chance at beating me? I'll keep coming back, knowing how to better dodge your attacks until I finally kill you! If you think you're safe, know this. I will not reset. I will save after you die!"

Brent and Fuku are frightened by this new Frisk. They looked over and saw Sans was having flashbacks.

"So. This is what he saw during her genocide," thought Brent.

Brent and Fuku felt determination to keep Frisk's mindset normal.

"Frisk! Stay as yourself! Don't give in to the evil!" he shouted.

"Idiot! I am not evil anymore! I am merely angry at this skeleton for hurting my niece so many times. I am helping her carry out her plan. Once he is dead I will return to my slumber," said Chara through Frisk.

"Oh good. I was worried for a sec," Sans said, breathing finally.

Midway in the battle, UF Sans killed Frisk. Everyone except for Sans, Brent, and Fuku were scared and worried.

"What the hell! Frisk is dead!"

"Oh my gosh! Why?!"

Then, Frisk regenerated on the spot.

"Looks like I can still regenerate," thought Frisk happily.

"What? Since when do you just come back instead of loading?" angrily asked UF Sans.

"Since my determination rose bitch!" shouted Chara through Frisk.

The murderous smile appeared on Frisk's face once again. Throughout the whole fight, Frisk's face was stuck on that crazed out smile. She never faltered smiling like a lunatic. She was killed again. Again she regenerated. Everyone was on the edge of their seat. They knew Frisk would win if she kept this up. But some feared she would lose her determination and stay dead. UF Sans was sweating bad and breathing heavily.

"Survive this, and I'll show you my special attack."

Frisk's crazy smile grew even more. They didn't know that smile could grow anymore since it was a wide smile to begin with. Frisk's body was littered with blood and sraps. Whenever her soul is inflicted, her body shows it. Bones appeared in her menu, which she hated. She had to time it right to get to her inventory without getting hit. Quickly, she opened her inventory and ate a Legendary Hero burger. Some of her scrapes healed. Then she attacked him, which he dodged.

"Here we go," said UF Sans.

UT Sans was having a weird experience watching Frisk try to kill an evil version of him. By the way Frisk was looking, the classmates were speculating that the end of the fight was near. Frisk dodged every single attack he threw. Then he randomly started slamming Frisk's soul all around the box in a last ditch effort to kill her. UT Sans was thinking, "give it up man. This is the part where she has you beat."

Frisk knew better than to try to move to the fight option during this critical moment. Everyone watched in suspense.

"Welp, ready for my special attack?"

"What?! She only has 1 health point left! She's gonna die again," said the one jock that Sans straightened out.

"Bring it on," said Frisk in a sickly sweet demonized voice as she tilted her head. Black gunk oozed out from her eyes and mouth as she started laughing.

"Alright. Here goes nothing."

Moments passed as nothing happened. The other kids were confused.

"Yep. It's literally nothing. And it's not gonna be anything either. Ya get it? I know I can't beat you. One of your turns, you're just gonna kill me. So I decided, it's not gonna be your turn. Ever. I'm gonna keep having my turn until you give up and come home with me. I wanna force you to marry me Frisk. I want you to carry my kids. I won't ever let you die so you can reset. Even if you do reset, I will keep impregnating you over and over until you give in," said UF Sans.

For the first time, Frisk stopped smiling. Then the smile returned. UF Sans unknowingly gave Frisk more determination. More determination to kill him that is. She waited until he fell asleep. Then, while he was sleeping, slowly moved to the fight option. She swung at him and he dodged. The whole class groaned in agony and annoyance.

"Are you kidding me?!"

"Heh, did you really think you'd be able to-"

Frisk swung again and slashed him open. UF Sans looked down at his wound. The whole class was silent before they started cheering.

"She did it! She finally killed the sicko!"

UF Sans lunged at her, but she was quicker and slashed him up some more. By now he was laying on the floor in a pool of his own mustard.

"It's funny. Before you came here, you couldn't lay a finger on me. If you were to return to Underfell, you'd be able to go home. I am stronger than King Asgore after all," softly said UF Sans.

Frisk looked at him.

"Sans, you may have the better attacks, but Omega Flowey and Asriel have better defense and offense than you. Neither of them die after one hit. So no, I can't beat them," said Frisk.

"Just so you know, in my own way, I loved you," Sans choked out.

Without wanting to hear another word from him, she stepped on his skull and cracked it all the way through. When she broke his skull, he turned to dust. A star appeared and Frisk saved.