zNSFW

Undertail

NUDEALERT

In which I am amazed Undyne x Asgore hasn't been a thing yet.

Toriel

I'm sure this also happened in someone else's mind...

Asriel's butt (animated)

Anyone got the source for this? (Asking here because fish tiddy)

Undyne by ChillyWally

Getting Frisky with the Muffet

Alphys Teaches Sex Ed

Toriel [DooM_the_Wolf]

I was told to post this here (technically not that NSFW, but eh)

Mom Boobs [Toriel]

Very bad child ( ͡° ͜ʖ ͡°)

Mew Mew Kissy Cutie

Buttslap!

HOI! by Blitzdrachin

Bunny Frisk

Muffins [F]

Adult Chara and Frisk

Kitchen

A belated Halloween Toriel for you lovely people

Undyne vs. a Human

Toriel on full display (Inuki)

Reunited by Kilinah

[OC] Thick Bully

3rd page of part 4

Alphys testing out a breast growth formula (xtrent968)

Eating out (Wizzikt):)

More facesitting (KingOfAcesX)

Muffet Fucks

Girl's gotta drink (Super_retroredo)

Alphys in a virgin killer sweater (tori)

Nerd Butt (Azai)

Muffet gets some new employees (Angstrom)

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