a/n: k quick few things going into this:
1. Frisk goes by they/them pronouns, the reader can decide if they are agender, genderfluid, gender-neutral, etc.; they are mute, so yeah, they use sign language; they are 18+ years old because pedo shit iS NOT COOL, they're just short as fuck or something idk
2. yeah this is in Sans POV but Sans is like 19 - 25 years old in my head to make this less creepy hmmkay? hmmkay
and 3. this is dedicated to crashboombanger on tumblr cuz their Underfell!Sans voice and character interpretation of him as a whole is the inspiration behind this thing. now go shower them with love, go on now; their blog is better than my fic anyway, just go to their blog
...and now that that's out of the way; come, come and kink shame the skeleton with me

...

" holding your hand is like a promise,
that i swear i'll never break."

...

In Underfell, you couldn't be "soft", by any definitions of the word. You can't be nice; you can't be merciful; you can't be gentle; and you especially can't be defenseless. There wasn't a monster in all of Home who wouldn't kill you if they had the chance, just like how there wasn't a single monster without scars; even Flowery or whatever the fuck his name was had torn or ripped off petals and leaves. In Underfell, nobody was untouchable. Mentally or physically.

Especially the humans.

Or at least, that's what I had thought anyway. With people starting fights just for funsies, I wasn't surprised that the past few humans who had arrived here were taken out pretty quickly before the souls were given (or, well, taken. Who the fuck would want to pass up a human soul? That shit was powerful as fuck. ) to Asgore. But you didn't need a human body to carry over their soul. So, I had still found a couple of their corpses, or, what I assumed to be their corpses. Often, the humans I found were mutilated beyond recognition. The only way I actually knew what a human looked like was by their skin.

Monsters had fur or scales, ghosts were transparent… things, skeletons were bones, robots were mechanical parts, and humans… had their soft, fur-less plush shit that meant evolution just fucked them in the ass, threw them into hell, and said "Try not to get a sunburn". And, trust, human skin is obviously weak and malleable, easily bruised and cut and shit, but it also was resilient. I've never seen any really recognizable "this is human" feature on one of the bodies besides skin and the inability to turn to dust. They just rotted away, like food. And maybe that was all they were on the surface world after they banished away the monsters; just… food. It fascinated me in a weird way, or like fascinates the scientist in me anyway. Just how… hypocritical humans seemed to be. Or their corpses anyway.

But then I got to meet one . Alive.

It made something… weird stir inside of me. Like adrenaline from a fight, mixed with the dreading knot of eating the Boss' spaghetti mixed together, but it was affecting my soul . In a… strangely good way? Not because of anything the human did or said, hell, the human was mute anyway and just kept talking with their hands, using sign language and all that. Thankfully the human could hear still and I knew enough about talking through hands from that old fuck, Gaster, to get the basics of what they were saying. The extreme basics, but whatever. If nothing else, I knew a couple of dirty hand gestures.

Strangely enough though, that was all we really needed to communicate. They actually laughed at my puns and whoopee cushion joke, like, the human would just make a weird wheezing or some a snorting sound. And they still got pretty terrified, looking scared and making gasps, whenever I threatened them, which... wasn't surprisingly often, actually. But, uh, the important thing, or important thing to me anyway, was their skin. Oh dear Asgore , that human's skin .

Once I shook their hand, it was practically over for me. I had never felt anything so… raw. In a good way, of course. And like I had examined the human later- with my eyes, you fucking pervs, nothing else, fucking hell, we're monsters, but that doesn't mean we're sex monsters- and, anyway, I saw that nothing else was there except more untainted skin. Their legs, arms, hands, face, neck- hell, even their ears- were just… spotless. And it made me feel… strangely... weak? If that was the right word? In a metaphorical way, of course, 1 HP doesn't mean I couldn't still kick the kid's ass and kill the little sucker if I put my mind to it. But… still. And it was weird on top of everything else, because in Underfell, I knew that the more scars you had and the more wicked brutal they were, the more badass and respected you were; I myself had all kinds of kickass knicks and cuts all over my bones; and I'm a big enough monster to admit even I'm victim to getting starry-eyed over some of the monsters I've met with wicked badass scars,- and Papyrus has too by the way, like with that Mettaton robot- like god damn... Heh... So I guess you could say, for this skeleton, it took a skele-ton of that kinda shit to make me think you were s-cool (Hahaha, I know, I'm a fuckin' riot!).

Which just made this whole thing… just... super weird , because the kid had spotless ass skin, there wasn't even a fucking papercut on the human. And they were in Underfell . I have no idea how they got to this point without a scratch, but… That's off-topic, uh, because, anyway, as soon as I had seen them, all I wanted to do was touch them ; handshakes, putting his hand on their back, taking hold of their wrist, cupping their- Ahem . I'm, uh gettin' off-topic again. Haha… sorry.

But, uh, I just blame the... whole thing on curiosity and fascination and all that stuff. Though, heh, I really had to hand it to the human (Aw, c'mon, that one was funny),... nobody had ever really… made me feel like this before. And… maybe that was because, I'd never touched anybody like this before. And the human was so… nice. Just, constantly signing me nice things, and offering a hand to hold, a hug to give, despite that stupid as flower (Pfft) bud advising otherwise. And, if it was anybody else, I wouldn't hesitate to, uh, "take advantage" of the situation… But with the human? Just… touching… was enough. I didn't want to hurt them. I didn't… want anyone else to either, mark up their skin and all that shit was just- It makes me- It's just… unacceptable. Battle? Fuck yeah, the human still had to follow Underfell rules, but I never let anyone really touch the kid. No fucking way would I ever allow anyone to actually hurt them. The plant? I still don't give a fuck what happens to him; he's a prick. (What? Don't like plant puns? Orchidding me! Hahaha!)

But... as for the... Uhm... Th-The human's just… so pure and… soft… Human skin felt so… different than anything else I had ever touched before. A, uh, good kind of different. A… very good… kind of different. And, really, before I even realized what this human was doing to me, I was already in too deep. ...I'm ...still in too deep.

Fucking figures I'd be skin-to some weirdo human skin kink... Heh. Just... Just my fucking luck.