Descendants x OUAT the child from another realm

Meet Danielle, well okay thanks to Maleficent she is now Bianca and is about to face the fact she is about to be going to Auradon. But little did she know she was going to be on the Isle. (*Spoilers if you haven't seen D3 yet, but there is going to be part of her story as well, as you find out about her father!) and how Hades claimed her as his own. (Which once they go through the barrier she will have a shock of a life time.) Also because there is the x-over please be aware that is going to be a long book because I am combining the movies into one timeline!
*This is mature because there are going to be some adult scenes in this story! Please understand I am going to also mark the chapters as well!