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Lustfell

Summary:

An adult Frisk finds themselves exploring a very different underground. Terrifying at first once they realize that the monsters are more bark then bite, (unless they ask nicely) Frisk finds themselves growing more and more curious about the strange creatures dwelling under mount Ebbot.

(This is a rewrite of my Lustfell AU. The first couple chapters will be roughly the same, but I have changed a lot of the cannon around for later sections.)
(on hiatus while I work on other projects.)

Notes:

(See the end of the work for notes.)

Chapter 1: Simple Introductions

Chapter Text

Frisk sighed tiredly as she cut the engine of her old truck, maybe her, or there...probably, his doesn't sound quite right…This time. There for now, there was time to figure it out.  

They thought, loading up their books.  There were only four of them, Frisk hadn't gotten the book lists for their actual classes yet. 

Undecided freshman. 

It didn't have the same ring as freshman biologist, or freshman English major. But how were they supposed to decide what they wanted to do for the rest of their life if they were struggling with their own identity?

Frisk began the long hike up Mount Ebbot. The quiet seclusion would be the perfect place to read. 

Gender and you by Brock Grayman

A rainbow of options By Kiki Bonanza

sexuality and you also by Brock Grayman 

And finally

Steamboats run on Steam. By Cassandra Steel.  

Which if the back of the book was anything to go by, was the worst written excuse for smut to ever be published, but Frisk's new roommate swore it was the hottest thing she had ever read. Armed with all these books, Frisk found a well lit opening in the rock that looked like the perfect place to sit down and read. They had barely walked into the little cave, before their boots got tangled in some vine, and they were plummeted down into the darkness.

Chapter 2: Goat Mommy

Chapter Text

Frisk opened their eyes in a strange bedroom, confirming that, no, they weren’t having a weird wet dream about frog monsters catcalling them. They rolled out of bed and caught the strong smell of cinnamon.

 The lady who helped them,  Ms.Toriel, brought them a pie last night. Taking their sweet breakfast, Frisk threw their backpack on and began exploring. 

There was only one other room upstairs, peeking inside it looked like another bedroom. Frisk debated snooping, but…given what had happened earlier they didn't really want to find out what other kinky things might be in there, so they continued on exploring down stairs.

They ended up finding Toriel in the living room first, dressed the same way she was when she came to Frisk’s rescue, sending the frogs running with a stern look. She was wearing a deep burgundy, silk gown with cute little heart buttons over the breast pockets. She was reading by the fire, a book of 101 of the dirtiest jokes ever written with no author on the cover.  

“Goodmorning dear.” she said, smiling sweetly when she noticed Frisk. 

“Morning, thanks for all your help.” 

“Of course, I'm always happy to have company.” she replied, sipping a glass of milk. The two of them chatted warmly by the fire for a bit, while Frisk ate their pie. The strong cinnamon making it a bit spicy. 

"Would you like some milk or water?" Torial asked kindly.

"Milk...but umm where do the cows live underground?" 

"Cows...oh, oh my, maybe I'll get you a glass of water." Ms. Torial replied, chuckling like Frisk was missing some joke. They continued chatting excitedly, until Frisk asked about a way out of the ruins.

"Why would you want to leave? It's safe in here dear. Surely you don't want to go back out and deal with all that caterwauling." Torial replied, but Frisk was determined, they ( she, he ?) They persisted. 

"I have many books here to occupy your time. How about fun facts! Did you know snails have many culinary and home remedy uses?"

But still Frisk persisted. 

"Did you know snails are hermaphroditic, meaning they can both conceive and impregnate." 

Still Frisk was determined to leave, Torial began to tug at one of her ears.

"Did you know when two snails mate they first shoot spiked barbs at one another to decide who the male is, because it's evolutionarily more advantageous to be the breeder over the bread."  She was getting a little louder now.

When Frisk asked one more time Torial sprang up and raced down another set of stairs.

Chapter 3: New Friends

Notes:

This Chapter has Pictures!!!

Chapter Text

Frisk exited the ruins with a heavy heart. It had hurt to hear Ms. Toriel’s desperate pleading to stay safe, but Frisk had to get out of here, their classes started next week. Walking through the crunching snow they heard a new voice. 

"Hey!"

 Looking down, Frisk saw a little pink and gold flower with a face. 

"Umm...hi." they replied. 

"You can't just walk around dressed like that. You'll get waaaay to much attention." The flower said, causing Frisk to glance down. Boots, jean shorts with little unicorn decals over the pockets, a long sleeved striped crop top with cute cut outs over the shoulders and a baggy plaid button up was tied around their waist in case it got cold. 

I should probably put that on. They thought, looking around at the piles of snow. This outfit however wasn't really something they would consider attention grabbing. 

"What do you mean?" Frisk asked.

"Look, I've been watching yoouuuu-  NO not like that! I've been watching and you might not be all gross and horny, but if you show off that much skin they’re gonna come up and wanna kiss and stuff and be pushy, and you really don't seem into that. Pulse, if you think the Froggits In the ruins were bad then you haven't seen anything yet." The flower finished, Frisk took a minute to look at him. 

Calling what the little Frogs said they wanted to do "kiss and stuff." Was putting it really really lightly.

"Hey, I'm Frisk." Frisk said squatting down to get almost eye level with the plant, causing him to flinch back.  

"Ummm, Flowey. Flowey the flower. Obviously. Now put that jacket thing on before someone sees you." He said, crossing his leaves like arms.  

Frisk put the flannel over their shoulders smiling, before stopping to think about that, Frisk was struggling with some identity issues themselves, and from what they remembered from highschool biology, a lot of flowers had both stamens and pistols, so-

“Do you have any prefered pronouns Flowey?” Frisk asked.

“Prefered what?” the little flower asked.

"like…Is it Flowey the flower, he's pretty great? Or Flowey the flower, she's pretty great?...or they're great that's an option to." 

"...you're weird." He responded looking at Frisk like he thought they were a very strange human. "...and I'm a boy!" 

"Well, Flowey, do you know a quick way outta here?" 

"No. You gotta go all the way through the underground." He said pointing down the road Frisk was headed. 

"How long is that?"

"It's gonna be really long if you don't button up your shirt." 

"Fine." Frisk huffed, doing exactly as the flower told them. After some fussing and quite a bit of scolding, Frisk ended up convincing Flowy to be their guide as long as they promised not to do anything "gross." So they scooped him up into their backpack and continued down the road. 

 

Branches cracked behind them and snow fell in poofes from the spindly trees. Eventually Frisk made it to a bridge with large open slates, nearly twice Frisk's shoulder length apart. 

"Is...that supposed to be a gate?" Flowy asked curiously, before a deep growl of a voice rumbled behind them.

"Hey sugar tits. Don't ya know how to greet a new pal? Why don't you turn around and shake my hand?" The voice asked menacingly. 

"Don't turn around. Run." Flowy whispered from the backpack. But still, Frisk felt determined. They turned. Behind them was a tall skeleton monster, well maybe tall, but it was hard to tell because of the heels. They were black And tall, but chunky like boots. He wore tight leather pants that somehow seemed to have curves around the hips despite obviously hanging low on the pelvis of a skeleton, the top was a black crop top that ended flush with his lower ribs, a fluffy maroon jacket just a bit shorter than the shirt was on over that, And a tight red collar with a gold heart lock hung around his cervical vertebrae. The flashing gold of the heart lock matched a single sharp gold tooth in the skeletons mouth.  

Only after the skeleton clicked his tongue (how does he even have one of those) did Frisk realize it may have looked like they just gave him a once over. 

"Like what ya see Suga?" 

"Oh, no. I mean, that's not...hi my name's Frisk." They replied holding a hand out to shake, feeling wholly embarrassed with their own shameless staring. 

The skeleton reached for their hand, "Sans, Sans the skeleton. Wonder what you sound like in bed baby?"  He mused, then he squeezed there knuckles together and rolled them causing Frisk to make a dirty sounding yelp that echoed through the woods. 

"Not bad Sugar, So, ya feeling Frisky, Frisk." He said, in a low husky voice.

"Uhhh no that wasn't ummmm." They floundered before he started laughing. 

"I'm fucking with ya suga." He told them pointing to his hand "That was an oldy but a goody."

"...well it ummm was nice meeting you but I have to go." Frisk replied, backing away. 

"Yeah, just go ahead. My bro built this gate but he made it way too wide to stop anyone.”

Frisk noticed, but they didn't say anything and walked on through. Sans followed them slowly.

"Yeahhh I'm supposed to be on the lookout for humans, ya know gotta keep the population up" he said with a wink. 

"But I'm way too lazy. My brother on the other hand, he's the captain of the harem's guard. Totally irresistible. There's no way he'd let you get away.” Sans explained as they walked through the snow.

“Oh! There he is, quick duck behind that conveniently shaped lamp!" 

Conveniently shaped indeed . Frisk thought looking up at the tall lamp post shaped like a naked bunny monster holding a ball of light over her crotch as the bulb, with a look of ecstasy on the bunnies copper face. From behind the lamp, Frisk watched a tall skeleton storm up. 

Holy legs for days batman. His heels looked sharp enough to cut. He wore tight maroon pants, with...is that a riding crop dangling from his hip? A black sweater that ended with his ribs and had a large oval opening exposing his sternum. 

Simple, but he cut a sleek refined image. 

"Sans! You better not be napping again you lazy slut!" He practically screeched. 

"Course not masta, just out here waitin fur clients." 

"It's pronounced Master, for fuck sake speak proper English! And what clients would you attract out here!" 

"Ya might be surprised bro." Sans replied, glancing over where he could see Frisk and winking at her again.

These two were trouble.

 

 

Chapter 4: Spice Cream

Chapter Text

Frisk’s breath came out in cloudy puffs, they rubbed their hands together to warm them. At first the magical snow didn’t seem too cold, maybe because there was no wind down here, but as they dove into the snow drifts and slid across the ice over and over  (all they had to do was go left, straight, left straight, right, straight, Why was that so hard?) it began to sink into their bones. 

“Hey, Human, you’re not gonna freeze to death or something are you?” he asked, trying to sound snarky, but Frisk could hear the care in his voice.

“Probably not. I’m just getting cold, I could really go for a hot cocoa or a hot cinnamon bun right about now.” They mused.

Flowy was quiet for a minute before suddenly musing, “If you don’t mind dealing with one of the vendors, I think I know a place where you can get something warm.” 

“As long as I can pay in gold, lead the way.” Frisk replied, already excited at the prospect  of warming up even slightly. 

Flowy directed them to a tall blue bunny monster standing in front of a food cart, he was in a mesh top with rows of piercings down his right ear. 

"Hey there lil mama, want something sweet to melt in your mouth?" He asked with a wink.

"umm, yeah how much for something to warm me up...like food...not like...Flowey!" they called as the bunny smiled at them like he thought they were adorable. 

Yeah, Frisk, way to sound like a grown adult that knows what you're doing.  

"Hey! Their eyes are up here Bunny Boy, and we would like two spice creams please." Flowy piped up from over Frisk's shoulder. 

"Whelp there either five G a piece, or free for a kiss." He offered, holding out his hand and smiling.

Frisk popped ten gold pieces into his hand. Somehow they just kept finding gold as they ran. 

The Bunny monster chuckled and handed them ice cream!?  

"Ummm Flowey? How is this gonna warm me up?" They asked the flower, as they handed him one of the fudge pop looking treats. 

"Never had a spice cream before huh?" The large bunny monster asked, pocketing the gold. "Man, you're in for a treat. This happens to be the perfect weather for a spice cream." 

Frisk shrugged, taking an experimental taste of the treat, only for warm spicy liquid to run down their throat. 

"That's just like Spanish hot chocolate. How does it do that?" They said in amazement, staring at the popsicle. 

"Magic." Was all Flowy replied as he ate his spice cream. 

When Frisk finished their treat they realized that the popsicle wasn't the only thing that was spicy about spice cream.

You're so hot my zipper is falling for you. Was written on the empty popsicle stick. 

"Ummm Flowy, what does your stick say?"  

"...I'm on top of things, would you like to be one of them." He said deadpan before tossing the stick over his shoulder. 

Man the underground is weird. Frisk thought walking into town.

Chapter 5: Stripped Shirts

Chapter Text

Frisk had nearly gotten accustomed to ignoring the cat calls, so they nearly walked right by a called out,  

“Oh hey!” only to immediately stop as a yellow blur fell in front of them. 

“Are you alright?” Frisk asked curiously. 

“Hehe, oh yeah, I'm  good dude.” The monster replied, shaking snow off of his face, and rocking to hop up, since he had no arms. His Black and Red striped shirt hung off one of his shoulders. “I uhh, just wanted to say hey, I don’t see a lot of other virgins. I can tell because we were both wearing stripes...I guess I just wanted to come over and say hey...but ummm well that probably wasn’t cool.”

“Well...you just bounced back up, so that was kind of cool.” Frisk replied, introducing themself.

“I’m MK, it was nice meeting you dude.” The yellow lizard called, before going back to talking to a small circle of friends. 

Once he was out of earshot, Frisk asked, “Flowey, what did he mean?” 

“I...I’m not really sure when that started. Strips used to show people that you were a kid underground, but then kids got rare. Anyone who actually manages to have a kid sends them to the school, so they can be fed and given supplements to make sure they're the healthiest that they could possibly be. So since no kids out here were stripes it started meaning something else. Like a sign of inexperience or innocence. People tend to go easier on people who are still in stripes.”

“This is them going easy on me?” Frisk choked out, in horror as they walked into the town library.

Chapter 6: A Date With Papyrus

Chapter Text

For the first time since they left the Ruins Frisk had a breather. They had fought, dodged, and out puzzled their way all the way to Snowdin. After the first monster to just pull them into an encounter instead of just aggressively flirting, Frisk had been terrified.

 Panic sending their pulse into overdrive as they hid behind one of the thick conifers while a dog in a mesh top sniffed the air for them. He had a black blindfold over both his eyes and Flowey told Frisk to stay perfectly still as blue bones shot up from the ground all around them

Flowey had to explain to them how things really worked in the underground after Frisk had calmed down and managed to sneak away after playing the most stressful game of red light greenlight in history. There were three key facts of the underground that he felt Frisk needed to know as they walked, ran, and puzzled through the rising snow and ice. 

Firstly monsters bodies weren't physical the same way humans were, they were made of hope, compassion, and magic. The latter of which was in short supply underground. This led to the hyper-sexualization of their race, as the monsters struggled more and more to reproduce since it required a large contribution of magic to make a new monster baby. 

Secondly, all monsters could both convince and impregnate, however they were naturally dominant. So whenever two monsters were interested in each other they would fight. When a monster loses this fight it's like a switch is flipped in their head making them ready to submit to the more dominant monster.  This however means pulling someone into an encounter is an acceptable form of flirting.

  Like snails , Frisk had thought.

Thirdly, the harem's guard were the crazy King's sudo police force, ensuring all the rules of the debauchery filled underground are enforced. They're all very skilled in combat and seduction, not to mention they’re all powerful magic filled boss monsters that pack the punch necessary to assist other monsters reproduce. So they probably weren't used to squishy little breakable humans. Best to avoid them as much as possible. 

Frisk had agreed, trying to hurry through town and leave before they ran into any guards; they only made one stop at the empty library to grab Flowy something to read that wasn't there books. 

They really didn't want the flower getting the wrong idea from that Cassandra Steel book. There were some lewd comments and wolf whistles directed Frisk's way, but Flowy assured them, that being pulled into an encounter in town was rare. They had almost relaxed.

Only to encounter the captain of the Harem's Guard himself as they tried to sneak out of town. They couldn't out stamina his barrage of magic. Especially because he kept distracting Frisk by talking about all the filthy things he wanted to do to them, so Frisk did the only thing they could think of and asked him on a date instead. 

"Hey, we really don't need to do all this fighting. Why don't we just t-talk over dinner or coffee!" 

The combat stopped instantly, and with Papyrus's arm around Frisk's shoulders, they walked back towards Snowdin. Only this time it was much quieter, minus the cat calls and solicitations. Everyone seemed to give Papyrus plenty of space when he walked through town. 

They walked up towards the Skeleton's house. All the while he was showering Frisk with compliments about there taste, seeming to carry the conversation flawlessly. He showed them around the small home he shared with his brother, decorated in dark wood tones with maroon and red accents. Frisk was enjoying the tour to the point where it was a bit surprising when he stopped I front of a door,

"And of course the main attraction." He said, getting close to their ear, "My bedroom." He practically purred, pushing them through and pinning them against the door by their throat. 

"If you have a preferred safe word I would say so now, otherwise it's Magic types. Orange for go, Purple use caution, Blue stop. Now if there are no other formalities, I'm going to fuck you until the only word you can remember is master. Color?" He asked confidently.

Frisk was shocked but they managed to shake themselves out of it and stutter out, "B-Blue, Blue, oh my stars blue." 

Papyrus jumped back as if he'd been burned, looking shocked. 

"...there may have been a miscommunication." Frisk eventually said, unsticking themselves from the door.  

"Yes...I Am terribly sorry. I probably should have asked before I started with grabbing you around the throat." He conceded sitting down on a large four poster bed with silk sheets. 

"Well...I mean probably." Frisk agreed.

"Take however long you need. We can talk about it if you'd like. Missteps like this don't happen to me often, but when they do I'd like to know exactly where I went wrong. And of course if you would like to drop it and try again at a later date we can of course do that as well. I want to make sure you're well taken care of when you're submitting to me." Papyrus explained crossing one of his long legs over the other primly. 

"ummm...well actually I'm not really interested in having sex with you at all.” Frisk said.

"But...you didn't want to fight anymore?" He asked, sounding confused.

"I can promise that not wanting to fight doesn't mean the same thing for humans that it does for monsters." Frisk explained gesturing between herself and the lanky monster.

"...then why did you ask me for coffee? No one ever actually means coffee, when they are invited over for coffee" He replied looking incredulous, even doing finger quotes around the word coffee.

" No, when I said coffee or dinner I one-hundred percent meant coffee or dinner." Frisk responded, "you know, like to get to know each other."

"Oh...I'm sorry I'm not interested in you romantically."

"That is absolutely fine." Frisk replied,  Holding their hands up, looking at Papyrus. It was really the only place they felt safe looking. The room was all classy dark woods and reddish maroons, it would have been lovely, except for the collection of “Toys” that adorned every free bit of desk and shelf space. “Obviously, this was just a...umm cultural misunderstanding.”  They added, because they really were having a good time with Papyrus before the last bit.

"Yes...Despite this misstep, I assure you I'm an immaculate lover. You don't get to be captain of the harem’s guard without quite a bit of skill in the art of pleasure. I can make up for the bit at the door. If you would let me know what I could do to make you more comfortable, any kink you might be partial to? I can make this night unforgettable." He said, trying to assure Frisk, giving them an incredibly charming (and sharp) smile.

"I don't really have any of those...if it makes you feel better I've never really desired to do...any of those things with anyone." 

"...never?" Papyrus asked in surprise. "Is that normal in humans?" 

"...from what I've seen. No. Humans are very sexual beings that start experimenting around there teenage years, give or take... and I've just...never wanted...or felt…I mean I've tried to just- that probably doesn't make any sense- sorry…" Frisk trailed off sighing in frustration. This was why they wanted time alone to read and figure things out, everything was confusing all the time, and having to stand here and try to explain everything was just twisting them up on the inside again. 

Why can't I just be like everyone else? They thought angrily.

"Absolutely none of that!" The skeleton said firmly.

"Pardon?" Frisk asked, confusion evident on their face.

" You have no responsibility to placate me or try to assure me, and I absolutely do not accept your apology…mainly because you do not owe me one!” He huffed, crossing his arms and tapping his foot before continuing. “You said you weren't interested. No matter the reason, if you had a hundred partners that should have been enough, that is enough. I should be the sorry one. Where's your backbone human?"

Frisk didn't know how to respond to that. After an awkward silence where Frisk thought it would be best if they left, Papyrus sprang to his feet.

"Do you like shrimp scampi?" He asked.

"What?" 

"Shrimp scampi? Is it a dish you're partial to...I mean it doesn't really matter because it's what I'm making, but would you eat it." 

"I've never had it before...but I'll try it." Frisk responded, smiling and jumping out of the way to follow him out of the bedroom, as he barreled past full of purpose. They had dinner together and watched mettaton movies (which were basically bdsm robot porn) , but the conversation was nice. After a while Frisk was even able to piece together a story from the fragmented dialogue. 

"So The prince dude, he's secretly the fantom right? None of the other characters hold their whips or anything else in their left hand (what the hell even was that studded thing, do I want to know? Papyrus please don't tell me if I don't want to know)...unless that was an editing error?"

 

"The great Mettaton doesn't make errors. (It's a flogger by the way.) Good eye... you're actually paying attention, and it isn't doing anything for you? At all?" Papyrus asked curiously, not sounding as judgmental as Frisk would have thought. 

"Nope. Nothing…I don't think it's possible for me…I bought some books on human sexuality. I think I'm on the asexual spectrum…I'm just like…not sure where."  They explained, watching Papyrus's face. Frisk had gotten used to people saying that they would like sex if they tried it, or that they just needed to meet the right person. Papyrus didn't say any of that though.

He nodded along at Frisk's explanation and took everything they said at face value. 

"I don't believe I have ever met anyone like you before." he replied pausing and seeming to be deep I thought before continuing. "...it's fairly understood underground that Blue means stop. That should keep you fairly intact ...it might not prevent every encounter but it could end them quickly. Of course if anyone gives you trouble about that, I'll give you my number so you can call at any time and I will come...Correct the situation"  He said, passing Frisk a sleek black phone, with a wicked smile on his face that spoke of violent repercussions.  

"Are those the types of things that the harem's guard handles?" Frisk asked, remembering the ominous warning from Flowey.

"Of course our mission is to ensure; populations are stable, people are safe, kink is practiced in a sane manner, and above all that everything is between consenting parties." He replied.

Frisk giggled lightly. "You're so cool papyrus."

"The term you're looking for is sexy as hell, but thank you." He replied smuggly, before gasping. 

A black fox had popped its head out of the kitchen with a leash and a thin bone that looked almost like a cane  in his mouth.

"Drop those you wily vixen!!" Papyrus screamed, jumping up to chase the fox. Frisk watched him sprint out the door before bursting out laughing and chasing after the skeleton and the aggressive fox.

Notes:

I have a tumbler now!

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