Adult-FanFiction.org : Games

Underground Journey	By : DeviousInnocent Category: +S through Z > UnderTale Views: 26329 -:- Recommendations : 0 -:- Currently Reading : 0
Disclaimer: Don't own Undertale. Don't make money off this story or this site.

Chapter List
- 1
- 2
A/N: Had this idea kicking around for a while. Got bored and decided to write it. It’s kinda funny, ‘cause the general structure’s been done before, I’ve yet to see it done with a female Frisk. I could just have missed them. Anyway, leave a comment if you enjoyed.
_____________________________

As far as Frisk could tell, the legends behind Mt. Ebott had largely been lost to time. The very basics existed. All that was known as fact was that monsters and humans went to war and humans drove monsters underground. Stories and rumors were whispered about how those who climbed the mountain disappeared.

To Frisk, this seemed ideal. She didn’t like the idea of “dying” exactly- she had far too much life left to live at her tender age of fifteen, and she wasn’t really suicidal. Instead, she felt the urge to simply live away from humans. And if people told stories about a mountain where people who climbed it disappeared, well, that meant fewer people would climb it right? Frisk doubted the rumors were true, but the quiet teen was confident she could survive up there. Sure, she might not be especially strong, but she was fit enough for a hike.

She didn’t quite look it, of course, even as she clambered up the trail with relative ease. She was definitely a shortstack of a girl, with a bit of chub and some decent curves, but not much height or defined muscle. She just wore a sweater and a set of thick jeans, but she had a bag with warmer clothes for when the mountain would get colder…

As she climbed, brushing her brown bangs from her eyes, she noticed a cave. She approached, curiosity piqued, and upon finding the wide, spacious hollow devoid of any wildlife, decided it would make a nice place to stay. She set her travelpack aside, leaning it against the wall, and began walking around the roomy cavern, before halting sharply with a little gasp. In the center of the cave was a hole. It was deep, and went right into the belly of the mountain. Plantlife grew from the hole, strange vines and flowers blooming around the hole.

Leaning forward, Frisk felt something snag her ankle, and squealed as she tumbled in suddenly, falling, falling…

There was a noisy thump as she landed in a bed of golden flowers. The girl slowly came to, and looked up. She had fallen an impressive distance. It was lucky she hadn’t been hurt worse.

Slowly the slightly bruised teen stood up, tugging her slightly tight sweater down and looking around. A deeper part of the cave she had found. Much deeper. The mountain was big, sure, but it was far more hollow than Frisk would have thought. Slowly, Frisk began to wander the cave, and when she rounded a corner she was rather startled to encounter… something. It was… well, it looked like a person, but made of a plant. Her face was an inhuman pallor, and her “hair” seemed to be crafted of flower petals, and the scanty clothes she wore that just barely covered her fairly slender frame. The somewhat taller flower girl grinned widely.

“Hi there, cutie!” She spoke in a voice overflowing with bubbly friendliness that immediately set off alarm bells in Frisk’s head. It was… too sweet. Oversimplified and sugary.

“Hmmm… Golly…” The flower-girl sucked on her finger, studying Frisk for a long time, black eyes gleaming. “...Oh where’s my manners! Tee hee! I’m Flowery~!” She leaned forward and Frisk felt strangely compelled to run. Unfortunately for her, there was nowhere to go. Fortunately the odd girl appeared to be stuck where she was- her feet turned to roots and stuck her to the ground, or at least that is what they appeared to be…

“You must be new to the underground, aren't ‘cha~?” The flower girl tittered, flicking her leafy hands, vines emerging from the ground and gently nudging Frisk closer. The girl squeaked and nodded.

“Well… Guess someone’ll have to teach you how things work around here, or else you’ll be sooooo confused!” Flowery grinned eagerly. “Guess lil’ ol’ me will have to do!”

Frisk jolted as the girl tugged her even closer. “See down here, monster girls are all over the place…” She looked Frisk up and down appreciatively, before her smile seemed to grow more devious. “And they’re gonna want to do all kinds of things to a cute girl like you, so…”

Her fingers wrapped tightly around Frisk’s wrists, dragging her so she was right up against Flowery, who’s grin was absolutely manic now, a strange flush creeping over her face.

“...You idiot...” She giggled, panting in a wild, crazed manner. “Down here, you’ll be broken and drooling for more in minutes~!” Frisk tried to jerk away now, struggling in the plant-girl’s grip, but more vines were emerging, wrapping around her, trapping her. Flowery was drooling unashamedly, gripping her petal-skirt and yanking it aside, revealing-

Frisk swallowed. Under the skirt was a throbbing, erect cock.

“L-let go!” She finally found her voice, trying to yank away, as the flower girl dragged Frisk down, forcing her face level with her member. Flowery giggled, vines slithering over Frisk, roughly squeezing at her chest and working into her clothes. Frisk shuddered and let out a pitiful mewl. Thin, but powerful little vines curled into her mouth, forcing it open, and Flowery gripped the back of Frisk’s head.

“Ooooopen wide~!” She sang, before bucking her hips forward,forcing the thick cock into the human girl’s mouth, and with another roll of her hips, down Frisk’s throat.

Frisk gagged and choked as the plant-girl began fucking Frisk’s face, moaning shrilly, giggling and cackling.

“Mmh, that’s a good slut!” Flowery giggled, gripping Frisk’s hair, yanking it to make the girl take the shaft all the way to the base, the human girl whimpering as Flowery aggressively slammed her cock down Frisk’s throat.

“I’m gonna make you my little toy… I’m going to break you and use you again and again~!” Flowery cackled, tongue lolling.

Frisk could barely see straight- her breathing was thrown off by the vicious humping and her eyes were tearing up from the rough treatment.

Then as suddenly as it had begun, it was over. Something smashed into Flowery, sending her flying from Frisk. Frisk gasped, coughing as she sat up. Flowery vanished, having apparently dug into the ground.

Frisk looked up, wiping spit and precum from her lips, coughing slightly, looking up. A tall, white-furred woman stood before her. Frisk blushed faintly. She was gorgeous, and something about her presence was very soothing to the busty human girl. She had a motherly presence to her.

“What a terrible creature…” She knelt, cupping Frisk’s cheeks. “Please, do not be afraid, my child. I am Toriel, the caretaker of these ruins…” Frisk found herself rising to her feet, legs shaking.

“T-that… flower… she…”

Toriel scowled. “Yes. I saw what she did.” She gently patted Frisk’s head. “You need not fear, my child. I will not hurt you. But you must be wary…”

Frisk looked around, wiping her mouth and shuddering. “W-will… other monsters do things like that?”

Toriel nodded. “Some may. However those that live in this area are far less… aggressive. But they have not seen a human in a long time, it will be difficult for them to suppress their urges…”

Frisk shuddered, still tingling where the vines had rubbed against her. “A-ah… I…”

Toriel gently squeezed her hand. “You need not worry, my child. I shall protect you. Come. I shall take you to my home.”

Frisk was tugged along, following the beautiful, motherly monster. She felt… strangely at ease with the fact that her face had just been used as a sex toy a minute ago, and shuddered. “Nnh… W-why is it… not bothering me, what just happened?”

Toriel smile softly. “It’s the magic of this place. It tends to… loosen inhibitions somewhat. And also eases those unaccustomed to the ways of monster girls into their new home… But there hasn’t been a human in a very long time.”

Frisk pondered this, blushing slightly, as she was led along. The monster woman paused, looking around the long purple corridor. “This place should be safe enough… My child, could you wait here for me?” She smiled gently. “You don’t need to be afraid. If any monsters bother you, you should be able to push them off, or tell them I am protecting you.”

Frisk hesitated. She wanted to trust Toriel, but she was uneasy about being left alone in a place that potentially had horny, aggressive monster girls that might not take “no” for an answer… Sighing she nodded.

“Ok.” She mumbled. “I’ll wait here.”

Toriel ruffled her hair and Frisk felt a wash of warmth rush through her. “Very good. I will be back soon. Here.” She placed an old, dusty phone in Frisk’s hands. “I shall call you. And you may call me if you need anything.”

_______________

Frisk waited for quite a while, before sighing. She couldn’t wait any more, and trying to phone Toriel didn’t seem to be working. The curvy girl stood and began walking, leaving the room. She was startled by another monster girl. This one looked less sinister than Flowery. She had a slightly wide face, and was a bit on the skinny side, with green skin and a long, long tongue. Like a frog.

The frog-girl hopped forward, landing in front of Frisk and suddenly, before Frisk could protest, planted a wet kiss on her lips. Frisk squeaked, as she stumbled, falling back with the girl atop her. The long tongue probed about Frisk’s mouth for a moment, before the frog girl sat up with a coy smile, her cock erect. It was still large, but far different from Flowery’s. It was shaped differently, smoother, with a pointed tip, but wider at the base.

“Wanna play?” The girl croaked. Frisk shuddered, but felt relieved the girl asked.

“I-I-” Before she could refuse, a weird feeling overwhelmed her. A strange curiosity and a desire to not refuse. She managed to settle on a midway point. “I-I’m not sure!”

“Aww, shy?” The frog girl ribbited, before gently rubbing Frisk’s head. Her skin was cool to the touch. “Why don’t you relax? We can go nice and slow and easy. Ooh, you can even just use your hands if you’re shy!”

For some reason, Frisk felt a strong inclination towards doing just that. She hesitantly extended her soft hands, wrapping them both around the cock. It was surprisingly warm and slick, and Frisk slowly rubbed, hoping to pacify the monster girl. As she stroked, the frog girl made soft happy sounds.

Frisk blushed deeply. Why was she doing this? She was a virgin, and had never really thought about sex in-depth before, and now here she was giving a handjob to a monster girl. Was it the magic Toriel talked about? Either way she was… rather enjoying this, much to her own confusion. Something about the cute satisfied smile on the Frog-girl’s face made her feel relaxed.

...And also really wet. Frisk became acutely aware of the burning desire in her pussy. The frog-girl grinned coyly.

“Still not sure?” She smiled, shifting so that she was back atop Frisk, fingers tugging at the human girl’s pants. Frisk blushed, but found herself not protesting. This was crazy. She needed to stop this.

“W-wait-” she started, but too late. Her pants were out of the way, her panties were down with them, and the Frog girl wasn’t waiting anymore. Frisk cried out as the frog girl thrust forward, a few inches of her cock working their way inside. Frisk bit her lip, shuddering at the new, overwhelming sensations rushed through her.

“Hnng~ Tight~!” The frog girl giggled, working her hips forward, nice and easy, taking it slow. Frisk whimpered and gasped, feeling the cock entering the deeper parts of her her pussy, steadily stretching her virginal walls, causing the girl to mewl pitifully.

“Mmmm, human cunt is the best!” The monster girl declared, pulling Frisk’s shirt up. Her long tongue wriggled forth, and Frisk let out another gasp as the tongue lightly wrapped around her nipples. She shuddered and moaned as the girl teased her breasts, one by one, switching off, all the while slowly gyrating her hips to get her cock in deeper.

The frog girl continued to grope and fondle at Frisk, until the whimpering gave way to soft moans. She grinned, and with a slow, steady thrust, pushed her full cock inside of the human. Frisk gave a little cry of surprise, gasping as the cock finally reached it’s fairly thick base, shuddering.

“Uhn~!” She gasped, panting. “It- it’s too much, it- huh?”

The froggit girl was heaving. Seems the light foreplay and all this work getting inside Frisk was too much- with a sudden, short little thrust, she squealed, shooting her load deep into Frisk, who gasped and cried out.

The frog girl slumped limply, before sitting up and smooching Frisk’s cheek, startling her. Without another word, the frog winked and dashed off.

Maybe this place isn’t all bad. Frisk thought with a meek grin, although she felt thoroughly unsatisfied after all that.

Guess I’ll have to be careful. She was pretty nice. The others… might not be...
- 1
- 2
You need to be logged in to leave a review for this story.You need to be logged in to leave a review for this story.
Report Story

Underground Journey