Could it be "Uncertainty" by Immortality22?
http://hpfandom.net/eff/viewstory.php?sid=41097
Harry is an incubus in this one and Lucius and Severus are his mates. And there is a discussion with Hagrid about what kind of incubus Harry is. It's completed, but ..well
Summary: Faced with a new magical inheritance, Harry Potter’s life has just taken a sudden turn. As he struggles to walk this new path, he learns to rely on those he is now tied to. But, in order to get the love he needs, he learns he must make a heart-breaking decision …. and live with the consequences.