I want to write a story that involves a dark fantasy creature as the main sexual interest, but am having a hard time coming up with anything besides vampires (or werewolves), which have been so overdone at this point in my opinion. Because the creature needs to be dark, that excludes things like mermaids and elves. And because the creature needs to be sexy (since it is the main sex/love interest in the story), that excludes unsexy dark creatures like trolls. Thank you all for your help!