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In this AU, Sans is homosexual/bi-curious, but he can't accept his sexuality.

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.

Lust sans