Nightmare' s dragon mate

A little bit of info
In this undertale AU all the skeletons are human and this is my first story sorry if it isn't good.

Story description
In all of AU's everyone lived pecfuly after defeating nightmare or so they thought and now they have to follow four demands from him, one that he be nown as a free man not a villain, two a place where he can be him self, three he wants to live someplace not near anyone, and fourth a hand of a willing partner and silverheart nows what to do tread to nightmares Castle to do the unthinkable which shocks the ohters..... and for both to full in love with each other