Gotcha! So I'll take werewolf!
There's a ton of things to do -- I keep saying that but -- yeah! We could, of course, take a friendlier route for these two. (Ex. Stuffing them into a universe that is still having a difficult time assuring equality between the two races. - Three if we count humans! But these two defy the odds.) But looking at your resume it says you're into rougher themes? So I was thinking either turf, or general racial wars between the two. And these assholes are basically using things like sex or romance or intimacy to just gain some level of ground against the other. Rivals, essentially. Or -- in a universe where one race has unanimously become viewed as superior to the other race. Another issue of race comes into play -- Racism, potentially. Segregation - Rights being broken and exploited, and these two just happen to take an interest in each other in whatever way we may seem fit, oooooooor
rambles on and on. Endlessly.
But those were just the first ideas that popped into my head;