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Sex and mature themes (including rape and sexual assult) are included in this AU. Although they are treated as serious issues that permantly harm the victim, a trigger warning is in order. Do not continue if a child or sensitive to themes of this nature.

For a less serious NSFW Au, here be Undertail.

Underlust is an AU made by NSFWShamecave, who has since abandoned the project. The project, with the permission of NSFWShamecave, has been picked up by Skele-cakes, and the comic will proceed from there.

About this AU


  • All the characters are overly sexualized and search for sexual attention except Mettaton who was a victim of sexual assault/rape.
  • Everyone else wears revealing clothing and some do get involved in some kinks.
  • Certain locations, such as Grillby's, are also changed to fit with the theme.
  • Instead of Flowey being a Golden Flower, he is a rose. His name in this AU is Rosie the Rose ( No, not Rosey the Rose- )
  • Mettaton is the only character in the underground that is not interested in Sex due to him being a victim of Sexual assault/Rape.
  • It's canon that Frisk looks the same, except their sweater is different color.
  • Asriel died after his birth.


  • Papyrus is still his sweet self underneath, and consoles Mettaton time to time, setting his wants aside, but also still craves sexual attention like the rest.
  • Sans also maintains the hidden depression though his reasons may have changed.

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