According to Wikipedia this is the definition of a siren from mythology:
In Greek mythology, the Sirens (Greek singular: Σειρήν Seirēn; Greek plural: Σειρῆνες Seirēnes) were dangerous creatures, who lured nearby sailors with their enchanting music and singing voices to shipwreck on the rocky coast of their island.
However, in my story, the Siren lives in the city. Unfortunately she sings when she climaxes....and her voice is deadly! (Literally).
The creature in love with her is a troll. Wikipedia describes them as:
dangerous to human beings. Depending on the source, their appearance varies greatly; trolls may be ugly and slow-witted, or look and behave exactly like human beings, with no particularly grotesque characteristic about them.
In Naughty Christmas Present my troll is indeed ugly, but very muscular (imagine Arnold Schwarzenegger) and he is in no way slow witted! Gren desires the lovely Ligia but how can he have her when she could be his death?
Read the book to find out!