DIRTY LITTLE SECRET ~ : A Spamvil explaination.

Undertale, Deltarune (crossover)

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Slash, NC-17, Undertale, Deltarune (crossover),

Our "blessed" union

Het
R
Finished
4
Author:
RepetRus
Fandom:
Deltarune
Pairing and characters:
Kris/Noelle Holiday, Noelle Holiday/Kris, Susie, Toriel, Kris, Noelle Holiday
Size:
13 pages, 6,067 words, 1 chapter
Date of completion:
19.10.2025
Tags: Angst Dark Elements of drama Forced relationships Gaslighting Obscene language OOC Partial OOC Psychological horror Psychological trauma Romance
Susie and I are at my place right now. Mom has prepared a wonderful dinner for the three of us after a long day at the festival, but I have no appetite. I can only think about her — about her actions, her character, her future, about the proposal I made to her on that Ferris wheel... I’m sorry, Noelle. I’ll take responsibility for what I’m guilty of when all this is over. I have no right to break your heart...

Harmony

Het
Translation
NC-21
Finished
4
Author:
Nurrenbri Nurrenbri
Fandom:
Undertale
Pairing and characters:
fem!Chara/male!Asriel Dreemurr, Chara/Asriel Dreemurr, Asriel Dreemurr, Chara
Size:
18 pages, 7,508 words, 1 chapter
Date of completion:
14.11.2023
Tags: Animalism First time Friends to lovers Incest Pseudo-incest Rated for sex Relationship development Resolved sexual tension Steprelatives Xenophilia Spoilers ...
Young goat hard fucks his beautiful stepsister read online 18+ without registration and SMS (don't judge by the description)

The Weight of Our Secret

Het
PG-13
Finished
2
The Weight of Our Secret
Author:
Alterro
Fandom:
Undertale
Pairing and characters:
male!Chara/fem!Frisk, fem!Frisk/male!Chara, OMC, OFC
Size:
7 pages, 2,808 words, 1 chapter
Date of completion:
17.02.2026
Tags: AU Care / Support Drabble Elements of drama Fictional creatures Fictional geography Fluff Modern days OOC Romance Secret relationships Teenagers
Three years after Monsters reached the Surface, SOUL magic is real. For Chara, the only magic that matters is his secret bond with Frisk. She’s older, a graduate, and his only sanctuary. They hide their love to avoid gossip, but secrets have a way of becoming too heavy. When a quiet walk leads to a sudden confrontation, they must decide: stay in the shadows or let their Determination shine?

I got into the Underdale

Het
NC-17
In progress
2
Author:
USYI
Fandom:
Undertale
Pairing and characters:
OFC/Mettaton, OFC/Sans, OFC/Papyrus, OFC/Muffet, OFC/Flowey, OFC/Toriel, OFC/Napstablook, OFC/Frisk, OFC/Asgore Dreemurr, OFC/Undyne, OFC/Alphys, OFC/Mad Dummy, OFC/Chara, OFC/W.D. Gaster
Size:
planned Midi, 9 pages, 4,100 words, 7 chapters
Last update:
17.01.2024
Tags: Anal sex AU Blowjobs Canon Divergence Collection of drabbles Cunnilingus Dirty talk Elements of fluff Fluff Gentle sex Hickeys/Love bites Hurt/Comfort Masturbation Monstrophilia Nipple play Obscene language OOC Philosophy Riding Romance Vaginal sex Violence
I got into the Underdale. I was surprised. At first I was scared, but then I became more confident!