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* This page contains content that is not safe for work or other locations with the potential for personal embarrassment, and is not safe for children to look.
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Sex and mature themes (including rape and sexual assault) are included in this AU. Do not continue if you are sensitive to themes of this nature.
Underlust is an AU made by NSFWShamecave, who temporarily gave permission to Skele-cakes to continue the AU. NSFWShamecave has since taken back the AU. All the characters are overly sexualized and search for sexual attention except Mettaton who was a victim of sexual assault/rape. Everyone typically wears revealing clothing. Certain locations, such as Grillby's are also changed to fit the theme.
Chapter 1 focuses on the relationship between Mettaton and Papyrus.
- Asriel was stillborn.