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1. Public Bookmark 52

   Dear Mailman: Yours, Cathode by SkykidNadir

   Fandoms: Deltarune (Video Game), Undertale (Video Game)  

   • Teen And Up Audiences
   • Creator Chose Not To Use Archive Warnings
   • M/M
   • Complete Work

   31 Oct 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Spamton G. Spamton/Tenna
   • Spamton G. Spamton
   • Tenna (Deltarune)
   • Seam (Deltarune)
   • Original Characters
   • Original Deltarune Character(s)
   • Alphys (Undertale)
   • Sans (mentioned)
   • Papyrus (mentioned)
   • QC (mentioned)
   • Grillby (mentioned)
   • W. D. Gaster
   • Undyne (Undertale)
   • Sans (Undertale)
   • The Riverperson (Undertale)
   • UT Spamtenna
   • Undertale AU
   • Deltarune AU
   • slow burn (i think?)
   • Spamton NEO
   • I don't expect this fic to get super heavy but there's discussion of some... highly unethical lab experiments
   • plus Tenna deals with a lot of existentialism
   • Self Confidence Issues
   • Depressive Thoughts
   • Self-Worth Issues
   • Fluff
   • Light Angst
   • Broken Bones
   • Minor Injuries
   • (nothing described in detail but if you're sensitive to that sort of thing...)
   • Passive Suicidal Ideation
   • Self-Destruction
   • Major Character Injury
   • Angst with a Happy Ending
   • WereNeo
   • The tags make this sound really depressing but I swear it's mostly fluff
   • Sans Knows More Than He Lets On (Undertale)
   • The Riverperson knows more than they let on
   • Trans Alphys
   • (it's an extremely minor thing but it's important to me)
   • Trash heap au

   Summary

   Years after monster and human society merge, a young monster returns to the Underground with the intention of finding a story to tell. She finds that story in a stack of well loved letters between one Cathode and Mailman.

   NOTICE: The final arc of this story contains implied suicidal ideation and serious self-destructive behaviors. If you are not in a position to read this sort of thing, you can stop reading after Chapter 22 and skip from there straight to the epilogue!

   Series

   • Part 1 of Dear Mailman: Yours, Cathode

   Language:

   English

   Words:

   21,253

   Chapters:

   31/31

   Comments:

   319

   Kudos:

   437

   Bookmarks:

   52

   Hits:

   7,479

   Bookmarked by Coonie23

   07 Feb 2026

2. Public Bookmark 24

   Salvaged Deal by Twilightdaisi

   Fandoms: Deltarune (Video Game)  

   • Not Rated
   • Creator Chose Not To Use Archive Warnings
   • M/M
   • Work in Progress

   30 Oct 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Spamton G. Spamton/Tenna
   • Spamton G. Spamton
   • Tenna (Deltarune)
   • UT Spamtenna AU
   • Spamtenna AU
   • Hurt/Comfort
   • First Meetings
   • no beta we die like the lord of the screens
   • Codependency
   • Fluff and Angst
   • Spamtenna Trashheap AU
   • more tags to be added trust
   • Rivals to Lovers
   • rocky start at least
   • cartoon violence
   • spamton is a puppet monster
   • glitching
   • Memory Loss
   • Trash heap au

   Summary

   Amongst the Garbage Dump of the Underground's Waterfall area, two monsters meet one another at their lowest and aim to build themselves up to be Bigshots.

   Language:

   English

   Words:

   8,993

   Chapters:

   3/?

   Comments:

   29

   Kudos:

   150

   Bookmarks:

   24

   Hits:

   1,772

   Bookmarked by Coonie23

   06 Feb 2026

3. Public Bookmark 13

   Just Familiar Enough (UT AU Spamtenna) by blankintheblocks

   Fandoms: Undertale (Video Game), Deltarune (Video Game)  

   • Teen And Up Audiences
   • No Archive Warnings Apply
   • M/M, Other
   • Work in Progress

   18 Oct 2025

   Tags

   • No Archive Warnings Apply
   • Spamton G. Spamton/Tenna
   • Tenna (Deltarune)
   • Spamton G. Spamton
   • Monster Tenna
   • Human Spamton G. Spamton
   • Monster Spamton
   • bear with me on that
   • I've split spamton in half like I'm king solomon
   • Angst
   • Eventual Fluff
   • Eventual Romance
   • Slow Burn
   • ambiguous implications of reincarnation and past lives
   • Tenna is a snail-ant creature of some kind
   • spamton is a puppet monster
   • spamton was also human again bear with me here
   • Tenna is lowkey depressed asf
   • Tenna hibernates
   • yes that is important
   • Monster Spam has a lot of things wrong with him ngl
   • Human spamton uses they/them pronouns
   • monster spamton uses he/him pronouns
   • Missing Limbs
   • Additional Tags to Be Added
   • First published fic
   • slow updates probably
   • Flashbacks
   • tenna is a sizeshifter

   Summary

   Living in the Underground is not really the best thing in the world, especially when you're one of the few monsters still alive to remember the surface, and also your long lost and probably long dead human lover from before you got sealed away.
   Tired and feeling without purpose, Tenna tries to find anything to make the days go by easier in the Underground. Until he meets a very strange little somebody in the junkyard of Waterfall.

   Language:

   English

   Words:

   2,900

   Chapters:

   1/?

   Comments:

   10

   Kudos:

   76

   Bookmarks:

   13

   Hits:

   713

   Bookmarked by Coonie23

   30 Jan 2026

4. Public Bookmark 82

   turning sweat into wine by terrorvision

   Fandoms: Deltarune (Video Game), Undertale (Video Game)  

   • Explicit
   • Creator Chose Not To Use Archive Warnings
   • M/M
   • Work in Progress

   23 Jan 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Spamton G. Spamton/Tenna
   • Tenna (Deltarune)
   • Spamton G. Spamton
   • Alternate Universe
   • Monster Tenna (Deltarune)
   • Human Spamton G. Spamton
   • Sweat
   • Pheromones
   • Mating Cycles/In Rut
   • Knotting
   • Mating Bites
   • Breeding
   • Consensual But Not Safe Or Sane
   • Everybody has a good time
   • Rough Sex
   • Squirting and Vaginal Ejaculation
   • Tenna-centric (Deltarune)
   • Religion
   • I'm Bad At Tagging
   • Bug tenna
   • Cervix Penetration
   • Blood
   • Somnophilia
   • Top Tenna (Deltarune)
   • Bottom Spamton G. Spamton
   • Other Additional Tags to Be Added
   • Tags May Change
   • Orgasm Edging
   • Multiple Orgasms
   • Begging
   • Dom/sub Undertones
   • Power Dynamics
   • Praise
   • Mildly Dubious Consent
   • Light Sadism
   • Light Masochism
   • Oral Sex
   • Blood Kink
   • Sexual Overstimulation
   • Biting
   • Spamton is a Raging Teratophile
   • Mouth Kink
   • FTM Spamton G. Spamton
   • female anatomy terms
   • Rough Oral Sex
   • Emotional Hurt
   • Love Confessions
   • Guilt
   • Light Bondage
   • Breathplay

   Summary

   A collection of somewhat connected one shots

   Language:

   English

   Words:

   14,143

   Chapters:

   6/?

   Comments:

   87

   Kudos:

   699

   Bookmarks:

   82

   Hits:

   9,739

   Bookmarked by Coonie23

   30 Jan 2026

5. Public Bookmark 32

   Double Exposure by SomethingStrangest

   Fandoms: Deltarune (Video Game), Undertale (Video Game)  

   • Mature
   • Creator Chose Not To Use Archive Warnings
   • M/M
   • Work in Progress

   22 Feb 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Spamton G. Spamton/Tenna
   • Spamton G. Spamton
   • Tenna (Deltarune)
   • Undyne (Undertale)
   • FRIEND (Deltarune)
   • Gerson Boom
   • Alphys (Undertale)
   • Asgore Dreemurr
   • Human/Monster Romance
   • Human Spamton G. Spamton
   • Bird Spamton G. Spamton
   • Monster Tenna (Deltarune)
   • Spamton disguises himself as a monster
   • A little
   • Body Dysphoria
   • Dealmaker as magical shades
   • Fluff
   • Angst
   • is FRIEND good or evil? yes
   • Secret Identity
   • Developing Relationship
   • Strangers to Friends to Lovers
   • No beta reader this author is too scared to ask
   • Spamton G. Spamton Does Not Have His Speaking Quirk
   • Tenna falls first but Spamton falls harder
   • Cw: predator eating its prey
   • It’s not graphic but it’s there
   • Spamton isn’t always a reliable narrator
   • Screw slow burns they fall fast and hard like Tenna being killed by the knight
   • Tenna has depression
   • The happy ending is much later
   • The story takes place many years before the events of Undertale
   • Fake Character Death
   • Get ready for possession
   • Supernatural Elements
   • Other Additional Tags to Be Added

   Summary

   Spamton has nothing left to lose when he decides stealing the souls back from the monster king would launch him back into people‘s good graces

   luckily he found an old pair of glasses that turns him into a monster so he can sneak through the barrier without raising alarm

   spoiler: nothing goes the way he plans

   Language:

   English

   Words:

   47,669

   Chapters:

   9/?

   Comments:

   109

   Kudos:

   294

   Bookmarks:

   32

   Hits:

   3,663

   Bookmarked by Coonie23

   29 Jan 2026