Flowerfell World au in genderbend.

In this world, a human soul, the last one needed to break the barrier, is destroyed by a flower disease, as buttercups are poisonous. He becomes paralyzed, but can still move his head and speak with his mouth. Raya is the name of the skeleton who helped him, at the beginning of his journey, navigate a world where monsters hate humans for driving them beneath the surface. Frisk grows his garden as long as he lives, planning to sacrifice himself to save the monsters. The owner of the garden is Flower—Frisk, who has also become blind from the disease. Frisk is in love with Raya.