damn right its creepy he was brought up with them as a baby i think.if he wouldve been an older child then it wouldnt seem weird if he hooked up with her.Not all true, Esme and Carlisle Cullen have adopted all the vampire kids who have coupled up. Also, it's not incest when Nero is adopted, because he and Kyrie do not share the same blood or family bonds, but they grew up together as siblings which is why I think it is a bit creepy.