Faerie Seduction

A fey lover often ruins the life of a friendly NPC, being so lovely that mere mortal lovers cannot hope to measure up. He or she also often seeks to be 
the sole object of a mortal’s affection and/or to lure a lover into forever forsaking the mortal realms.

Examples:

1. A huldra or glaistig attempts to waylay the traveling PCs with revelry and games until nightfall, when she turns on them in a bid for carnage or enslavement.
2. A dryad becomes smitten with one of the PCs passing through her grove and attempts to seduce them; she interprets every refusal as playing hard to get.