The history of Lust Sans is ambiguous.
Chara that fell in the dungeon - possesses the soul of lust. After her death, Dr. Gaster created a serum, which is needed to restore the monsters' ability to give birth, because they were on the verge of extinction.
Lust Sans is very worried about this. He knows about the other AU's and doesn't understand why his world is so degrading.
Frisk falling in the dungeon should show true love to the monsters.
Drawing this character is definitely harder than just repainting a jacket. But that's Capitan Salat for trying new things.
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