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ML is cursed by a lust demon. FL's special ability helps overcome the curse. ML harbours feelings of desire and guilt toward FL who believes she has a one-sided crush on him.
FL makes a wish at a fountain for sex. ML is a tentacle demon who learns about love and commitment from FL.
Love triangle. Both of the older brother's friends have had a crush on FL forever. Poly ending.
Foursome. Two nephews and their uncle dote on a recently heartbroken FL who eventually marries the uncle but maintains a poly relationship with all 3 men.
The Mating of Elves