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fictitious-fluff · 2 years ago

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This was written in 2021 for Tickletober2021. (posted on @ticklishshenanigansau using their prompt) Posting this to log my progress at a writer

(yes i am p ry lc, have to seperate the name as I want this to be a seperate account that people that know me irl wont be able to find it by searching up my name)

Eight Plus Two Makes Ten

Prompt: Counting

Fandom: Undertale

No pairings

Masterpost

Nothing scheduled today, Papyrus finally taking a day off to hang out with Undyne... Yup. Today was the best day to relax... A day to just be even more lazy, a da- "Sans!" someone shouted, bursting through the door. Oh, it was Frisk.

"oh, wassup?" Sans waved.

"I called you five times already and you didn't pick up or reply to my texts!!!" Frisk exclaimed.

"oh sorry. left my phone upstairs heh."

"Well grab your phone and let's just get going already I guess."

"going where?"

"To the study lounge outside the library you bonehead. Did you forget about our meet up?"

Oh, right! He knew he was missing something today. "ah... ok, give me a moment." Sans said, before teleporting upstairs to grab his phone. "ok i'm ready, let's go frisk."

"Aren't you gonna teleports us there since we're already 25 minutes late?" Frisk questioned.

"oh right, forgot I could do that heh."

Sans held out his hand as he spoke. Frisk rolled her eyes in amusement and grabbed it.

The study lounge usually didn't have many people since the library had aircon while the study lounge didn't. Both of them usually chose that spot since Frisk always felt the library was too cold. Moreover, they kinda liked the privacy the place provided. The best place to study without any disturbance.

As time flew by, sans stumbled across something peculiar to him. "hey frisk? can I comfirm something?" Sans tapped Frisk's shoulder.

"Yeah?"

"this book states humans have 12 pairs of ribs... is there a typo? or is it true."

"It's not wrong. Why? Do you have a different number of ribs?"

Sans looked a little surprised, "well yeah. I only have 10 pairs... weird. humans are weird."

"Pff- says the guy that's close friends with a human. Anyways, would it be fine if I checked to see if you really have 10 pairs of ribs? I'm curious now." It was interesting to Frisk how human anatomy and skeleton monsters were so similiar yet so different. But technically skeleton monsters weren't exactly skeletons from humans so it made sense.

"uh well I rather not do it in public.. you know" Sans commented.

"Oh, no, I didn't mean show it to me, I can just try feeling it through ur clothing if that's alright with you."

"well, if that's the case then it's... fine, just do it."

"You sure? I wouldn't want to do something your not comfortable with."

"nah, it's fine. I'm okay with it."

Well... If he said it was alright then alright. Frisk started slowly moving down Sans ribs, counting slowly as she made her way down. All the while, she was oblivious to Sans. There was a reason why he was hesitant.

Sans could feel the slight laughter threatening to slip out. He had to use all of his will power to not move or make any sudden twitches. That, and the fact that he was trying not to grin like an idiot even though it was fruitless.

"snrk-!" it slipped. Welp, all of his efforts were in vain because of that one slip up.

"Uh Sans? You alright? I heard you-" Frisk stopped as she scanned Sans's half covered face. After a few seconds, it clicked. "Oh wait... Are you, ticklish?" Frisk then started scribbling a little harder.

This time Sans pushed on her arm, clearly knowing she was doing it on purpose now. "kh! w-wahait we're a-hat the st-studehe lounge n-now. Theherse p-people studying." Sans stuttered, trying to control his laughter from pouring out.

"Okay, I guess I can lay off this new discovery. For now." Frisk snickered and stopped. "Don't think for a second I'm letting this off though."

Sans whimpered. Time to stay in his room for the next few years. "can we jus get back to reading...?" He pleaded

Frisk gave him a thumbs up and continued to read up on how human souls worked. Occasionally chuckling as she saw Sans ever so often darting his eyes towards Frisk and back to his book.

A few days after the incident, Frisk had planned to have a sleepover at the brothers' house. It was always a blast when the two were around. She couldn't wait to finally relax after studying for one whole week, straight.

Ding! The doorbell sounded. Papyrus was cooking up some lunch, which was finally something other than spaghetti, so he couldn't get the door. "SANS! Can you get the door for me?" Papyrus exclaimed from the kitchen.

"ok" Sans replied, as always.

"oh, sup." Sans greeted Frisk.

"Hey Sans. The food actually smells good for once. Papyrus's been taking classes?" Frisk asked.

"yup. wannna stay in my room while we wait?"

"Sure!"

Frisk stated walking up the stairs to Sans's room, only to find out he had taken a shortcut up there. Typical Sans. When Frisk opened the door, as usual, it was a mess. His bed was no more than a mattress on the floor, with a table, a beanbag and a chair beside it. On the table there was a few sketches and books layed out in a pile. Near the entrance to the right, there was a bookshelf full of science books and a few new additions from the last time you visited. Frisk could see Sans sitting comfortably on the beanbag reading a book. As if he had been waiting for Frisk for a long time.

"so, i've recently been reading more about humans. gotta say, pretty weird. guess that's why you were so confused on how i worked, with how all your organs work and stuff." Sans had always thought humans worked similiar to monsters. Sure, he knew they were different, but he didn't know they were extremely different. They did have souls anyways, though he hadn't found a book talking much about human souls which was unfortunate.

Frisk walked over and sat on the chair, all while listening attentively to what Sans had to say. "Yeah, just like how I was surprised you only had 10 pairs of ribs. Speaking of which, I haven't really gotten the chance to count them since last time, have I? And I still have my doubts..." She chipped in.

Sans eyes widened for a brief moment before eyeing Frisk, "d-don't you dare."

"I am also kind of curious how you manage to feel without nerves... I might need to conduct an experiment to find out." Frisk continued.

At this point Sans had wrapped his hands around his sensitive ribs, zipping up his jacket. However, Sans did have a trick up his sleeve to counter Frisk's attack. He did have a knack for observing expressions to tell what their next move would be. In addition, while Frisk was still babbling on, now would be the best time to strike. Now just any attack though, a surprise attack. He could teleport and he was going to use it to his advantage. And that was what he did.

However, Frisk knew, she knew that Sans would retaliate. So the moment he teleported, she turned behind her, expecting to catch him off guard. Though, she was the one who got caught off guard. Sans being Sans, knew full well that Frisk expected something like that. So instead of teleporting behind her, he teleported in front of her. Sans then engulfed Frisk into a bear hug and digged into her sides. Frisk yelped and tried to get away but Sans grip was too strong. Who knew he could actually be decently strong? "!? SAhAnnNs aha! Pfhaaha waahaaittt!"

"you were the one who started this frisk, heh."

No! Frisk couldn't let a silly skeleton overpower her. She had to retaliate! Among her struggles, she managed to catch a hold of Sans's wrist. With much effort, she finally turned the tables. Frisk pulled one of Sans hands above his head and scribbled on his ribs. "crahahaap! frihiskk nohoo, ahem sorrhee!! nahaa-" Sans flailed. Guess he hadn't though that Frisk could get the upperhand so quickly. He should have used his gravity magic on her.

"I started this and I plan to finish it!" Frisk exclaimed. "Now let's see.. How many ribs... 1, 2.."

No matter how Sans struggled and pushed, he couldn't get rid of Frisk's teasing fingers. "aeheh alreheady tohold yaha it wahaaas 10 pahahairrss!!! staaaahaap ghaaha!" Sans tried teleporting or using his magic to push frisk away, but he couldn't focus enough to use it. His magic, though was very powerful, was not trained enough. Damn, he should start training with Pap if this was going to be a thing that Frisk would do now. Now that was a joke of course, he probably would just practice dodging instead.

"Well, I still need to make sure don't I~? 6...7.." Frisk teased.

"thihis iss juhuust cruhuehel- nohooo nahaht theeheere!!!" Sans snorted. "ghaahaha plheheaasee!-" The poor guy kicked and flailed but nothing helped. Uncontrollably laughter continued to pour out.

"Juuust a little more~ I could always go faster~~" Frisk cooed "10..11..12.."

"wahaahait! nahaahaa dohoon't, ahaa! cohome ohonn-"

After what seemed to be an eternity for Sans... "And... 20!" Frisk release the poor guy.

"hff.. hf.. thahnk g.. hff god." Sans panted, slumping to the ground. He lied on his back, facing the ceiling as he closed his eyes.

"Pfft. You alright there Sans?" Frisk chuckled. She handed Sans a bottle of water she found on his desk.

Sans nodded, accepting the water and gulping it down. Afterwards, he looked up at his alarm clock. Damn, it had only been 7 minutes and he was already tired. However, he still had some energy... And he knew exactly how he was going to use it. After a few minutes of chilling in Sans room, the both of them heard Papyrus call them for lunch.

As they walked out, Sans called out to Frisk. "Yeah?" She responded. Sans was about to speak, but stopped himself.

Instead, he replied, "uh nevermind. i wanted to tell ya somethin' but i forgot heh."

Frisk gave him a confused look but continued walking down the stairs. Sans being Sans. When Frisk turned towards the stairs, Sans casual grin turned into a smirk. Guess Frisk forgot that Sans has a tendancy to side with justice.

#ticklish!sans #teen frisk #tickletober2021 #platonic #sans #undertale #female frisk #old fic #tickle fic

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