I Need Help

Finding the title of this book I didn't finish reading. It's about this Atlantis demigod who is violently torn out of his mother to be born with a human prince. He is regarded as a curse while his twin is raised as the golden child, the demigod is raised as a pleasure slave. And along the way his older sister gets him out of that situation but can't help him more than that. Then the demigod meets one of the Greek goddesses in her temple. And that's as far as I got in the book. Any help will be greatly appreciated. I remember the author was a lady but I don't remember the name either. And it might have been a series? But this one is about the first book.