Possible Pairings : Sans/Reader ; Flowey/Reader [In an Sibling way] ; Reader/Papyrus.
(Choose you'reself] - Frisk has no Gender (Since it's unknown but i'd like to think
of them as a Girl. :3) Also i don't own Undertale, didn't come up with the Idea of
Underfell and i am writing this for Fun. Only continuing it if at least one Person reads it

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You climbed the mountain, you climbed it like you had never climbed anything before. It was all such a blur, what happened really? You couldn't put the pieces together. Not really, yet here you were lying on a patch of yellow flowers. They were so pretty, you almost forgot about your current problem. Standing up and brushing yourself off, the first thing you did was looking up the hole you fell in from. It was a really long way up, and the fall should've hurt, but didn't.

Well, you weren't going to complain about it. "Who are you?" a voice suddenly spoke up, making you look around only to notice nothing out of the ordinary. Was it just your imagination? "Howdy, over here!"

Looking down, a yellow flower like the ones you landed on swung a little, a face set in between its petals, "I'm Flowey, Flowey the Flower!" Its voice seemed a little cautious and nervous, despite its smile. "And you are..?"

You didn't say much. "Frisk."

You stared at the flower once more, and tried to put the odd situation into a few bits and pieces to fit into a right puzzle. What was happening here? Crouching down right in front of it and looking closer, the petals of 'Flowey' seemed ruffled, as if someone had deliberately stomped on it. You briefly wondered if that was your fault.

"You're a human... you shouldn't be here," it looked around nervously. "Frisk, you're not safe down here," it continued worriedly. You had a feeling that you shouldn't trust this yellow talking flower, nevermind its friendly appearance.

You promptly stood up and started walking away from it.

"No wait! I want to help you!" Looking back at the flower, it seemed to try to follow you desperately. "If you're gonna keep going, take me with you! I'm not strong enough on my own!"

The lights cascading down from the hole in the ceiling glittered throughout the cavern, making it beautiful and still. It was reflecting from the walls and created the hazy illusion of a flower pattern behind Flowey as it seemed to be in the center. Did the talking plant thing save them?

It was hard to tell since whatever it was it could be capable of lying. Flowey pressed on your pity button, saying over and over that it could help you. Slowly going back to it you kneeled down next to it on the ground. Beaten and innocent looking eyes looked up at you shortly before drifting to stare at the ground.

"Or... I don't know. It's just so much," it let out a pitiful sob of defeat, "I don't know how long I'm capable of handling all this violence anymore..."

* Take Flowey with you ♥

*Put Flowey out of his misery

You couldn't let this poor guy stay behind after seeing his despair. "Can I pull you out without killing you?" you said quietly, the offer still there in your tone. From his leaning position, the part that could be assumed as his head perked up.

"Wha-- why would you... Oh!" He nodded excitedly with little hesitance. "Yes! I'm a monster after all! Everybody down here is!" Well, if everybody looked like Flowey you didn't really have anything to worry about. Still...

Gently grabbing the base of that flower you started pulling him out of the soil, careful to be wary of his roots. You wondered briefly when you started calling Flowey a 'he', but brushed it off. You can't call a companion an 'it' after all. Might as well get some pronouns out of the way. Besides, 'he' seems to fit Flowey for some reason.

It was easy enough with only a little bit of dirt flying through the air. He kind of looked like a snake, you noted, if a snake had petals and two ruffled leaves. He even moved like one, wiggling a little as you held him in one hand. You pulled him closer to you, meaning to bundle his roots in your arms only to yelp in surprise when he swirled around your neck like a scarf.

Since you didn't really mind he could stay like this as long as needed. It was rather cute. "Oh thank you, thank you thank you thank you. You don't know how much this means to me!" He rubbed his head on your cheek and you had to cough a little. It was a little weird as he smeared dirt and dust all over your face. Well.

"Oh, what is this?" A voice that seemed thin and womanly was heard behind you. "A human?"

Turning around you faced a giant goat. She seemed... familiar.

Flowey pulled back and whispered in a hiss, his tone stressed out as he coiled tighter around your neck. "Don't trust her... don't, don't, don't." You gave his petals a reassuring pat.

The woman, or more appropriately described as monster, in front of you was standing on two legs, the purple faded robe she wore long with a weird symbol at the base of it. She seemed friendly judging from her face, which was smiling, yet two blood red spots right under her eyes made you hesitate. It made her look like a crazy person that hadn't slept well for a long time.

Plus, the smile she wore seemed way too big for someone who wasn't up to something. Flowey hissed again, "Down here, it's Kill or be Killed. Kill or be Killed!" A little more straight forward he added, "And nobody around here likes humans very much."

You scoffed, "Well, thank you." You took a step back as Flowey chuckled, looking at you sideways.

"W-well, except for me. I like you, but... please don't trust her," he insisted.

*Trust the goat monster

*Push her over and run ♥

As fast as you could, you sprinted around her in a tight arc, narrowly missing her as you shouted, "Sorry Ma'am!" You picked up speed as you heard her heavy padded paws coming after you. Gritting your teeth, you ran faster.

"What is with this world?! Why don't they like humans!?" you yelled over your shoulder.

The flower wrapped his leaves around your hair to keep himself from falling off. With impressive effort, he told you all about the brief history of monsterkind as you sprinted through the caves. "A long time ago, all monsters were locked down here by powerful human wizards! It was back when the monsters had lost the big war against the humans, and since then the King had started collecting the souls of the humans that fall down here in an attempt to break the Barrier with them! S-since a monster can't really pass it on their own!"

A sharp turn to the left nearly made you trip to your knees. Where were you supposed to run!? "Where am I supposed to run!?" you repeated your question aloud.

Flowey yelled out in distress, "As if I know! I never got this far!" He screeched all of sudden. "Faster! Faster! She's catching up to us! Don't turn around, oh god!" As fast as you could swing your legs you sprinted down a carved hallway made of stone.

"Yelling 'RUN' isn't going to make me go any faster! I am NOT killing ANYBODY!" you shouted to no one in particular.

Flowey's leaves grabbed your hair harder, making you cringe slightly. "It's Kill or be Killed!" Another sharp turn. You managed to puff out a yell in reply between breaths, amazingly.

"I'M NOT PULLING ANY FISHES OUT OF THE WATER!" There was a path up ahead, splitting into two directions. You glanced at your panicked companion as you sprinted towards it. "Okay, right or left?!"

Flowey shrieked. "Left!"

You almost slipped as you took that turn and you realized you could barely breath anymore with the amount you're running. You barely registered your short pants with the increasing stress of so many things going on. Up ahead, you spotted what seemed to be a door.

"What's that?!" you gasped, squinting past your fatigue.

"Run into it!" was the helpful reply your flowery friend gave.

That you did, and there was no effect. You flew back and landed on your back with a grunt. To be honest, you had no idea why you even tried.

"Oh so sad..." a soft voice spoke. Looking up, you stared into two creepy eyes of the goat lady from before. She didn't seem tired at all, what was she, half-goat-horse? Flowey crept closer around you as he shivered.

"She got to us!! We're doomed!" he whispered.

You rolled over and stood up. "Please leave us alone..."

The request only made her giggle, "I just want to help you. You're just like the other humans... No trust to be had, only wanting out!" She came closer. "But out there, there will be other monsters! They will kill you slowly and painfully. I'll promise to do it quickly. As fast and painless as death can be!" She spread her arms like she was expecting a hug. "I will even take care of your friend..." she finished as her grin widened.

Backing up, you glanced around trying to figure a way out. The giant door behind you wouldn't move an inch, no matter how much you pushed. You were stuck leaning against it pathetically. What where you supposed to do? Flower suddenly twitched as he noticed something next to your head.

"Bye!" Flowey's root swirled over, grabbed a lever on the wall and pulled it down with a soft thunk. The door gave and you stumbled backwards outside. You didn't even see the big door close again after you fell out. It was... cold all of a sudden.

"Is she still following us?" you whispered as you rubbed your arms.

A moment of silence. "No... Not really, maybe she can't leave the ruins. Never saw her do it. Or heard her do it, and that door was pretty loud," Flowey responded confidently.

Loud didn't do it justice. The creaking and rumbling of it was loud enough to wake up a whole town. Slowly standing up again, you saw to your confusion the snow that surrounded you. Patting it off of your clothes and gently brushing some off Flowey you looked around in wonder.

"This is a good step forward!" the yellow flower rubbed his face against your cheek, to which you giggled as his petals tickled your chin. "...It's cold though," he added as an afterthought and barely managed a pout with his flowery face.

You inspected your surroundings carefully. It almost looked like you were in a forest, yet the trees around you seemed really dead and lifeless. With nothing else in mind, you started walking, the snow pleasantly scrunching underneath your shoes. Something struck against your shin and made you stumble, nearly getting a face full of snow. You prodded a little, and uncovered what it was that caused you to trip under the thick blanket of snow.

It was a stick.

*Take the stick with you

♥

*Leave the stick behind

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Think about you're choice!