#UNDERTAIL
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zhangblue1129.bsky.social
🐙🍪
'𝑙𝑒𝑡'𝑠 𝑐𝑜𝑛𝑡𝑖𝑛𝑢𝑒, 𝑠ℎ𝑎𝑙𝑙 𝑤𝑒?'

#undertaleAU #undertail #sanscest #nightmare #epicsans
October 9, 2026 at 6:39 PM
spicy-bones04.bsky.social
⚠️+18 WARNING⚠️

I have a thing with bjs idk. 🥀

#undertaleau #ocxcanon #killersans #killer #gax #oc #killerxgax #killerxoc #fanart #UT #UV #undertail #nsfw
October 9, 2026 at 1:19 PM
crunchy-rocks.bsky.social
Super messy sketches!! Inappropriate usage of sockets drools. Cross should just be glad it's not Horror's ❤️

#crosssans #killersans #undertail
October 9, 2026 at 6:42 AM
suzuneesama.bsky.social
my brilliant theory: the prophecies for "the tale that must be followed" vs "the tail that must not be followed" are a cautionary tale in reference to mispelling the undertale hashtag and accidentally searching undertail, thus being flashbanged by sansyrus porn or some shit
October 9, 2026 at 5:39 AM
wouldntmind19.bsky.social
Kinktober day 8!! We got some extreme stuff today hehehe

TW: Breathplay and panicking, but dw, Reaper is nearby! ...probably

#genosans #geno #undertail
October 9, 2026 at 3:13 AM
xenias98.bsky.social
made this temmie piece based on a wip by x.com/uun_uuni/med...

#temmie #nsfw #undertail #pixelart #pixel_art
October 9, 2026 at 2:17 AM
johnwolfboy.bsky.social
[cw: NSFW]

Looks like @forebucks.bsky.social had quite the growth spurt this morning!

Wonder how this'll affect his surfing career..

It's probably hard to maintain a tube ride, when you've got a tube of your own periscoping through the crest!

#TFEveryday #Transfur #Hyper
Forepaws in his otter form marveling at his cock after it burst from his shorts and swelled to massive proportions. The otter is wearing a pink shirt, a gold necklace, and some remaining shreds of a tight pair of black athletic shorts. The otter himself is trim with a bit of muscle, has a pink coat of fur with a cream colored middle, lower face, undertail, and paw tips. He has shaggy brown hair, purple eyes, a brown nose, and a prominent amount of whiskers. He has a tattoo banded around the middle of his tail showing two solid purple lines, and a helix-like design in the center. He's leaning back with a bashful and elated grin on his face. He's biting his finger, while his other hand is holding a still swelling cock. The cock is black in color with a thick vein on the side, the cock is paired with a plump sheath and a pair of cream colored balls that hover less than a foot from the ground. His cock has grown to nearly his size, and shows no signs of stopping. There are two shreds of his shorts that are holding on for dear life until the next lurch in growth hits his cock and balls.
October 9, 2026 at 12:58 AM
bitter-limelight.bsky.social
Stolbush is my favorite part of the bird! Along with fluffy undertail white fluff beneath his cloaca
October 9, 2026 at 12:00 AM
corn-islife.bsky.social
Got bored and made this
#deltaruined #nsfw #animation #alphys #undyne #undertail

I dont really animate so im honestly kinda proud of this 🙃
October 8, 2026 at 11:12 PM
reptoidsscreech.bsky.social
My half of a trade for a friend on discord~
My oc Jenga topping their oc~

#undertail
October 8, 2026 at 10:04 PM
puppyboy.neapolitanhusky.com
Fun fact, there was a period after Undertale came out where a lot of furries on Tumblr pushed for Undertale NSFW art to be tagged as "Undertail" to keep it from overshadowing SFW art. Not out of prudishness or sex-negativity either.
October 8, 2026 at 9:18 PM
wa-sp.bsky.social
KYAAAAA ₍₍⚞(˶˃ ꒳ ˂˶)⚟⁾⁾ TSYM @wouldntmind19.bsky.social for accepting my FluffyNight comm! I love it so much, we need more sub Nightmare ꒰՞⸝⸝⊃ ·̫ <՞꒱

#undertail #FluffyNight
October 8, 2026 at 8:30 PM
dracomangamer.bsky.social
"Undertail"
October 8, 2026 at 7:22 PM
darkwaterphotos.bsky.social
I caught this Cooper’s hawk mid-stance, either pulling off a masterful stretch or executing a tactical "slice" with maximum aerodynamic clearance. Absolute peak athletic performance. Those fluffy pantaloons are a choice, though. 🦅

#OhMyDouglas
A hilarious low-angle view from behind a Cooper's hawk perched on a thick tree branch. The hawk is either preparing to or has just finished "slicing" (projecting its waste horizontally). Its fluffy reddish-brown and white undertail feathers are puffed out dramatically to the sides like a pair of giant, split Victorian bloomers, revealing a perfectly clear path beneath it and making its thin yellow legs look incredibly tiny by comparison. Its head is raised high and hidden behind its torso, leaving it looking like a comical, trousers-wearing creature. #BirdSky #OhMyDouglas #CooperHawk #RaptorGram #Birds #TOPhoto
October 8, 2026 at 6:01 PM
voctopie.bsky.social
Temmie needs a "lil" help with those hjugeeee sloshers of hers~ #Art #NSFWart #NSFW #Digitalart #Hyper #HyperSky #DELTARUNE #UNDERTALE #Undertail #Deltaruined #Temmie
Temmie grasping one of her fat sloshy hyper tits and asking the human (you) if you'd like to help her drain them~
October 8, 2026 at 5:53 PM
wicken.bsky.social
I decided to draw some #horror lust

#undertale #undertail? #undertum
October 8, 2026 at 5:14 PM
spicy-bones04.bsky.social
⚠️+18 WARNING⚠️
(WIP)

I feel horny today.

#undertaleau #ocxcanon #killersans #killer #gax #oc #killerxgax #killerxoc #fanart #UT #UV #undertail #nsfw
October 8, 2026 at 2:52 PM
jftollefson.bsky.social
Day 8 - #Stinky

Ringneck snakes have a brightly contrasting undertail that they curl into a ball as a warning they are going to release a very stinky musk.

#Inktober #reptileart #sciart #scicomm
Drawing of the front end of a snake in an S shape. Snake is dark grey with an orange neck band. 4 simple snakes with their tails curled into red/yellow curlicues form a frame. Text in upper left “#inktoder day 8, Stinky”
October 8, 2026 at 12:49 PM
crunchy-rocks.bsky.social
I been out here dawdling gang I made this account specifically for the dubious porn but putting it out there?.... Just tie the noose...! Anyways freaks enjoy and everyone else look away.

#epiccross #undertail
October 8, 2026 at 11:13 AM
donpatosaurio.bsky.social
Kinktober day 7: Aphrodisiacs + catsuit #kinktober #kinktober2026 #nsfwart #Undertail #sansnsfw #Underswapnsfw #cupydBlue
HO-HOLD ON, LOVE! SO EAGER! 💗💗💗
October 8, 2026 at 12:55 AM
mememeoverunow6.bsky.social
No context needed
#undertail #underfellsans #yumeship
October 7, 2026 at 9:33 PM
spicehive.bsky.social
Sometimes I go into Vrchat and take photos with characters I like so I can make edits of them ripping major ass

I enjoy skelefarts very much

#BerryUnsanitary / #Vrchat / #Eprocto / #FartFetish / #Undertail
Edited photo of Ts!Under.swap Papyrus in vrchat ripping ass Another vrchat edit but with Dust.trust Papyrus fartin up a stormm
October 7, 2026 at 6:27 PM
mrgayshit.bsky.social
Wip of Starlo in a cow print...I
need this fat man
#undertail #undertailyellow
#undertaleyellow #fatfur #nsfw
October 7, 2026 at 6:27 PM
watersuii.bsky.social
🌭🍅&🫐🍅
#undertail
October 7, 2026 at 5:29 PM
jolan.bsky.social
Is the undertail smoochable? :3
October 7, 2026 at 5:25 PM