I looking for a bedroom fun story where Equestria has fallen due to the fact that someone killed discord because of this Celestia and Luna power over the sun moon are gone and so is their political influence because Celestia was too busy earning points with her people to really make an effort to help others. The nearest safety for her people is a kingdom run by an ex human who showed up in Celestia life sometime after the first nightmare moon incident as a Pegasus only to arrive and find out that he is an alicorn.
He still a little ticked off about his being banish from Equestria over the fact Celestia didn't want to deal with someone who needed help. He allied with a changeling queen and got luna pregnant and began a herd with Celestia. Our favorite queen of the wedding episode ended going the herd and twilight is there with wings and ends with with luna son before the author quits writing.

https://www.fimfiction.net/story/281071/the-cost-of-asylum