Best Epic Sans/Reader Fanfics
Sans/Reader fanfics over 100,000 words. All curated from AO3 and ranked by kudos.
Top 6 Epic Sans/Reader Fanfics
Ranked by AO3 kudos. These are reader-favorite long-form Sans/Reader fics — save them for offline reading.
Making A Monster
by absurdmagewrites
Sometimes life throws you a curveball. For you, your curveball was going to bed looking like a human, and waking up looking like a monster. A skeleton monster to be precise. With the barrier breaking, a large surge of magic descended on the town you live in, and transformed you overnight. Unsure wha
Good Boy
by this_is_my_alt
A misunderstanding lands you in a meeting of monsters and fetishists. From the chaos you find yourself in the dynamic company of a kinky Mutt, gasterblaster! Sans, and a cat-ear wearing Axe.Deals are made. Boundaries are broken. You become thoroughly entangled in this group of horny skeletons with v
What's Keeping You Here
by MissSugarPink
Your name is unimportant. Your job is nonexistent, really. And your (ex)roommate just kicked you out in the middle of a surprisingly cold November night. But whatever. You don't care. You'll be fine. Keep telling yourself that as you freeze to death, idiot. But you'll be fine, for one reason! Two, a
When life gives you a gun, you're gonna shoot.
by Quinme
One moment you were on the call with your friend, the next you are in a shady dark alley, pressed by... a crocodile in fedora? Life is confusing, and you have no damn idea where you even are and what will come next.
More Than Meets The Eye
by Asaila
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 rem
Disaster Coded || Error x Reader
by Strawberry_Milk_Snake
There's only one rule for those capable of AU hopping: never bring a real person into the Undertale multiverse. But, like all rules, it was destined to be broken.
Find More Epic Sans/Reader Fics on AO3
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More Sans/Reader Fics by Length
Looking for a different reading commitment? Browse Sans/Reader fics in other length ranges:
Why Read Epic Sans/Reader Fics?
Epic-length Sans/Reader fanfics — over 100,000 words — are the format of choice for readers who want full novelistic immersion. These are the works people talk about for years, the ones with their own subreddits and tag clusters on AO3.
Many of the most beloved Sans/Reader fics in the fandom land in this range, because the slow build of trust, conflict, and resolution that defines the pairing needs room to breathe. Set aside a weekend (or several) and dig in.
About This List
This list of 6epic Sans/Reader fanfics spans 2,050,636 total words. Kudos range from 95 on the newest entries to 5,205 on the most established. Most entries are ongoing works, so subscribe on AO3 for update notifications. The most common rating is Explicit (4 of 6 fics).
Recurring tags across this list: Reverse Harem · Slow Burn.
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