After being crowned Twilight finds out that she has become a unwilling player in the millenia old powerstruggle of the noble houses. Learning in a quite blunt way that she has to take on a consort. Simply because of a law that states that there must be a royal consort atleast once every 300 years. And not only that, but also that the only nobles themselves can select those of which she can choose them from.
With a ruse she seemed to get a decent choice. However, how will life turn out for the bookish scholar when it turned out that her new bride has been the comfort mare of a spoiled brat ever since getting her cutiemark? And almost equally important. How will the noble react to a 5P:
a pretty pissed purple pony princess?