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This au is a crossover between Underlust and Underfell, all the characters are very similar to their underfell counterparts, but just a lot more sexual.
As writing this the creator of this au, fullofbadtimes, has deleted their tumblr, and appears to have abandoned this au, so now this au is coinsidered as a shared au.
Sans, who is usually called Edgeberry or Sinberry, acts very similarly to Underfell Sans. He is rude, edgy, and selfish. He is really disrespectful and mostly treats people like trash. Like Underlust Sans he acts like a slut and wears showy clothing.
Papyrus is very lustful and kinky. He'll often try to seduce anyone that he's attracted to. He's very similar to Underfell Papyrus, except he's very slutty, like Underlust Papyrus
Frisk is a kind teenage human who somehow ended up falling into the world of slutty monsters. She is very determined to help the monsters though. Even though she really isn't comfortable here.
Napstaton is a very slutty robot and the star of the underground. He is also the DJ of Muffet's strip club. He also has his own series of very popular shows in the Underground.
Muffet owns a stripclub in Snowdin. Muffet entertains her customers by doing something sexual while serving customers or just slowly stripping naked on the strip pole. She also refers to Napstaton, who is the DJ of her stripclub as her "pet". She is always showering him with sexual favours and teases.