Hi, I have a book suggestion that I feel very few people do justice to this trope, and I definitely think you could be one of them. It's totally okay with me if you don't want do this.
What if there was this supernatural creature created for the sole purpose of eliminating the originals because 'nature always finds a balance'.... a phrase TVD did not do justice to.... But the OC ends up falling in love with one of them...
So they are destined to destroy each other, but end up falling in love, and maybe they have a kid who is a loophole baby like Hope, but because the baby has the DNA of both parents, the child is exceptionally powerful