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It's your birthday and you want to try a new position with your Soulmate Sugar. It goes well until you lose strength in your muscles. Good thing Sugar is strong enough for both of you.
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When Sans' machine goes off in the middle of the night, you discover some surprises.
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Sex.
In human culture, it is both vilified as well as romanticized. Young people are both discouraged and encouraged to have it, and especially in a college party atmosphere, the mixed signals can be stressful.
Then the monsters came to the surface, and from the other universes. It was never fully explained why or how, but it happened, and they were quick to stick together. Within months, Undertail University was founded by Dr. W. D. Gaster, and it gained a reputation as a thriving college atmosphere that boasted high graduation and success rates. It also boasted a very different view of sex, one that monsters had been entertaining for centuries.
Somehow, against all odds and despite what people said, you’d applied.
Somehow, you’d been accepted.
And somehow, for some unknown reason...you’d enrolled.
(Based on the headcanons of Skelltales and the #discordcrew on Tumblr, as well as some of my own. Written with permission.) -
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5 years since the ascension, 3 years since the universes collapsed.
Sans finds himself head of a mob family of skeletons in a topsy-turvy city, mostly as a result of economy booms and monster wares being banned. He doesn't really mind, the life of a mob boss seems to suit him.
However, Sans' mob isn't the only one in the city, and when he brings you home on impulse one night, he gets more than he bargained for when he finds out how you're...connected. -
- Words:
- 428,790
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- 4
- Bookmarks:
- 51
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- Words:
- 238,519
- Works:
- 4
- Bookmarks:
- 25
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You wake up in an empty room, you can't remember who you are or how you end up here, all you know is that you need to leave this place. Your first encounter being a pair of skeleton brothers that seem both too nice and scary, you wonder what's the deal with this place but does it really matter? the place is full of strange creatures, what would you do?
There's no place for someone like you in a place like this.
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Congratulations! You Are Now the Main Character! by moonyjustwritingactually
Fandoms: Undertale (Video Game)
30 May 2026
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You’re working a shitty job, with shitty people. You have a shitty family, a shitty social life, a shitty apartment, and doing even shittier health wise. The only things that bring you joy are your persian longhair affectionately named Gargaroth The Devourer, and your seemingly never ending list of personal projects. One day a portal opens up, sucking you, Gargaroth, and your binder of notes for all of your projects, into a world filled with magic, monsters, and multiverse mishaps. Apparently you got here because a skeleton monster named Sans was tinkering with a dimension defying machine that sucked you and a bunch of alternate versions of himself and his brother through to his universe. On top of all that, apparently you’re the soulmate of every skeleton who got brought here, including the original pair of brothers…at least your cat is still acting the same.
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The M.A.G.E Project was not considered something you sign up for if everything in life is going great. M.A.G.E Project stood for the Monster Assimilation (and) Genetic Examination Project. The government were trying to integrate monsters, who had only emerged from Mt Ebott a few months ago, into human society but due to their apparently violent nature and their ability to use magic no one was sure if it was safe for them to be around humans. So a test was proposed. For a full year, willing human and monster participants would live in an enclosed society together to not only test if the two species could live together but to also see if magic had any lasting effects on the human participants. Your life wasn't really great so deciding fuck it you sign up to room with two such monsters for the year. Only with your server anxiety and mild depression living with strangers is a lot harder than you first thought it be. The only thing that could possible make it worse is if you found your soulmate while on the experiment.
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- Words:
- 156,963
- Works:
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- Bookmarks:
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Mystery Work
Part of rewrite
Summary
This is part of an ongoing challenge and will be revealed soon!
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So, I heard you like skeletons...
Reader insert prompt fills for @skeletonh0e's sans-centric Kinktober challenge on tumblr
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You and Underfell Sans are at a nice restaurant with a dance floor. Both of you dance together, and the song Your Man comes on.
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Between a cramped apartment and a mysterious, worsening illness no doctor can explain, your life is already at a breaking point. Moving into a house full of skeletons brings unexpected warmth and comfort—and all you want is to repay the favor by bringing light into their lives. But the clock is ticking. As your health drastically declines, you are left with a agonizing choice: do you tell them the truth, or do you protect them from the impending heartbreak?
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You only wanted a normal life.
Then you met them.
Sanses and Papyruses from different worlds, each carrying their own past, their own wounds, and their own ways of becoming part of your life.
For a while, it almost felt simple.
Then the timeline broke.
Now everything has started over. They don’t remember you. You don’t remember what you lost. And yet, somehow, the same familiar warmth keeps finding its way back.
Because some bonds do not disappear just because the world forgets them.
Arc 1: (Familiar Warmth) Chapter 1-18
Arc 2: (What Survived) Chapter 19-20
Arc 3: (True Beginning) Chapter 21-60 (Subject to Change)Status: Short hiatus due to personal reasons. Hoping to return around August.
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a girl just trying to figure out her life and place in the world
hopefully these skeletons can help her through it?
(also available on quotev)
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Basically you explain to him what an everything shower is after he comes home from patrolling just as you’re about to take one, and in your stupidity you offer to walk him through your routine. He of course accepts, and you walk him through it… steamy things ensue, and it’s not just the heat from the water ;)
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You're no one special. Just another human living with a single parent. Your life is pretty boring, or so you think, but then one day you wake up and it's not in your bed...
Series
- Part 42 of Sentinaltale & AUs
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After your best skelefriends disappear on you with only a shitty phone-call goodbye for 'closure', you find yourself spending months looking for them everywhere -- failing, failing, failing until one certain trail led you to getting lost in a forest on a mountain, had your life threatened more times than you could remember, and made what were only two skeletons at first suddenly multiply in count.
What no one expected, however, was how your SOUL made you hold a secret nobody was aware of, and just how it made every single thing connect to you.
...Unless, of course, you were Sans.
Almost unless, anyway.
Just an advice though, dearest Reader?𝘿 𝙤 𝙣 𝙤 𝙩 𝙙 𝙞 𝙚 .
Boy, are you in for a ride.
Series
- Part 1 of ksverse
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Bad Decisions™ (aka: Sans fucks up and you have to deal with the consequences) by fundamentalerror
Fandoms: Undertale (Video Game)
18 Apr 2026
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you live a cute little picturesque life with your skeleton boys, interrupted only by legal issues, racist cunts, raccoons, and sans fucking with his damn machine and bringing several alternate versions of himself and paps to your reality.
it’s gonna be a skele-ton of problems from here on out.