Sensitive bones
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Summary
Sans always keeps his word. So when he said he'd meet you at his place, and then didn't answer the door, you knew something was wrong. You just didn't expect it to be this.
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Fun fact: if you ask, everyone will have an answer as to whether or not you had feelings for each other.
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You and Papyrus have been dating for awhile. You tire of the relationship and decide it’s either time to reset or take the relationship in a different direction. In an effort to keep the timeline fresh, you attempt to make the moves on your skeleton boyfriend, who is apprehensive at first but quickly changes his mind when you show him what you’re capable of.
Includes ambiguous gender Reader throughout, except the Epilogue, which is Reader with a dick. The Reader has no explicit dialogue and all of Papyrus’ dialogue is written under the assumption he would be a nervous, stuttering mess. Has a fairly detailed depiction of the magic used to form monster bodies, which is also the substance the phantom appendages and fluids are made of. Game mechanics/references are meant to be vague and only for the sake of the very little background information given. Lots of technical terms for specific bones, so there might be some necessary Googling to picture what's going on.
If something doesn't make sense, the answer is probably: it's magic!
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Vacationing to the underground wasn't your idea of fun, but your family insisted, and hey, it probably won't be so bad anyway. And there, in the Underground, you meet a wide variety of monsters. More specifically, one skeleton that makes your heart leap out of your body. And another, who makes your twin sister's heart leap out of hers. (post-pacifist where humans are totally cool with monsters)
-edited for consistency-
Series
- Part 1 of On a Balcony
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Sans finally has some time to himself, and plans to indulge.
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When I Come Back To You (Currently being re-written!) by FantasySpices
Fandoms: Undertale (Video Game)
08 Nov 2018
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At the young age of 9 Ryou, a half human/half monster hybrid, comes home to find that her home is ablaze with her mother dead inside, she is caught by those responsible and thrown into Mt. Ebott. After being found by two friendly skeletons she is taken care of and raised by them. The older brother Sans, after Ryou's 19th birthday, noticed her changes and fell in love with her. Chara and Flowey show up and begin killing monsters...starting with Sans's little brother Papyrus. Sans, devistated by the incident began neglecting Ryou by drinking then coming home to shut himself away. After months of despair Sans comes to her with a plan to go back in time to make sure Flowey and Chara are stopped. The night before their departure, Chara finds Sans and manages to attack him and mortally wound him. Ryou get's Sans away to the time machine, but knoing his fate he sends her back alone. She finds herself further back than planned, she meets Sans again, but he has no idea who she is. She begins her long process of making things right again...but will her feelings for Sans change her decisions and make her abandon her timeline?
(all Undertale characters are owned by Toby Fox) -
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Ever since monsters emerged from underground, public opinion has been divided. Many people embraced the idea that they weren't alone on the planet, and opened their hearts to the new citizens of earth. However, many humans also don't trust monsters. Monster hate crimes and other forms of monsterphobia exist the world over.
When a new security guard at work is revealed to be a skeleton, your world expands, and you have to deal with problems you never expected. Including your feelings for him.Yes, there will be smut.
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The story in which a surface dweller journeys to the underground seeking something they'd lost, and finds far more misplaced than anticipated.
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Sans can't help feeling desperate when he dreams of you.
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You’ve known Sans just long enough to be able to recognize his poker face on sight, but not quite long enough for him to take it off around you, and you know it shouldn’t hurt, but it does.
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Grillby knows what Sans likes, even the stuff Sans tries to hide.
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Time lines were always the same, predictable when Frisk falls to the Underground. It either ended with everyone living, about to pass through the barrier or with his own death in the Hall of Judgement. Upon visiting W.D. Gaster's old lab, Sans discovers a door that has never, ever been there before. He digs up some old research notes and finds the thing that he has never known he had been missing.
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Blue-Eyed Monster by ForgiveMeForIHaveSinned (orphan_account)
Fandoms: Undertale (Video Game)
18 Dec 2015
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You've been dating Papyrus for a while now, and you've recently taken your relationship to a more physically intimate level. You and Papyrus are very happy about this. Sans...isn't, and you think you might know why.
(Post-pacifist ending I guess, gender-neutral reader, no gendered pronouns.)
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Today's play-date with Mettaton went perfectly, and it was all because the Great Papyrus chose to wear his lucky underwear.
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You existed between time and space. You “existed” and at the same time did not.
You knew what it was like to have nobody notice you and watch the world around you go by without you. You also knew what it was like to “exist”, to have others see you, speak...well scream at you, be aware of your presence. You preferred it when no one noticed you. Now that some monsters and one very determined human have noticed you...what now? The short skeleton in the blue hoodie and the human child in the the striped sweater seem to know.
"Between Time and Space: the story that puts even the slowest burns to shame. It's chapter 30 and romance hasn't even been mentioned let alone thought of!" -RedeReindeer
Series
- Part 4 of Pieces of You
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When a bender in Alphys' basement lab has Sans spending less and less time with you, you decide to take matters into your own hands.
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It's Sans' birthday, and the two robots want to do something nice for the skelly.
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Dial it Down For Me by phobiaDeficient (TheTriggeredHappy)
Fandoms: Undertale (Video Game)
13 Feb 2016
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In which Sans learns some information about Mettaton that he really should never have been trusted with, and the consequences could honestly have turned out worse than they did. The systems check-up might have been interrupted for a bit, but really, that's their business.
(Now detailing another point in time where Mettaton decides to turn the tables.)
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Sans finds himself in a tight spot when he gets a visit from an evil version of himself.
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Underswap Sans and Papyrus going through all sorts of sexual scenarios. But when their passion burns intensely enough, through their heat they form something even greater.
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Bookmarks which have used it as a tag:
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Papyrus dies, everything resets, and Sans remembers just enough to get real messed up over it.
Bookmarked by SargeWritesFanfiction
30 May 2025
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Bookmarker's Notes
my heart in your hands by 0neType
Summary:
Papyrus dies, everything resets, and Sans remembers just enough to get real messed up over it.