Modern AU is basically where the Novelty family bloodline is modern, no medieval shit basically. They are not of royal blood of Eric, because in this AU, Eric is just a uncivil country. There are no rulers or government or anything civilised, so it is just wild Ericas lmao. But Novelty bloodline is wealthy and respected, in this AU, there is only teenage Edwardin. No 37 year old Edwardin, just 17 year old Edwardin. Rei will remain of royal blood, and yes, Rei and Edwardin will still be canonly married. This will just make Edwardin an emperor of Litino with Rei, this does not mean he will magically be of loyal blood. Although, his family will still be mostly deceased, but this time Avery was not abandoned, he grew up with Edwardin this time. But sadly, the killing of Eddy's mother and sister and the origin of his brain damage and disabilities will still be present. But Avery would be there, just he wouldn't be harmed, he only witnessed. So yeah, that's all.