Series title: Immortal Equestria
This work title: Broken Moon

Extra fetish tags include large breasts and butt, masturbation, futa, themes of slavery and recovering from abuse (though trying to be grimlight/hopeful rather than grimdark). Also as mentioned, the main characters in general have body proportions similar to Marauder 6272's art, which means various levels of THICCC (with 3 Cs).

To be clear, the slavery depicted here is meant to be almost the exact opposite of Fall of Equestria content, where instead of abject cruelty and rape, kindness, care, and trust is the mark of a good slave-owner, and love is practically overflowing from the Crystal Heart in the Crystal Empire.

[Setting Details]
The sheer power of love overflowing from the Crystal Heart has caused the residents of the new Immortal Empire of Canterlot to become gods and goddesses in their own right, and a golden age of prosperity sees Equestria become ever more eager to share the glory and love with others. However, there cannot be all sunshine and happiness, a month prior, Princess Luna went missing, with only a mysterious and mocking note challenging the Mistress-Goddess Celestia. It was discovered that she had been taken to the lair of the power-mad Sunset Shimmer, who sought even greater power by stealing aspects and even body parts of her alicorn nature. Knowing that she would have limited time to experiment on Luna before being discovered, Sunset Shimmer created a temporal anomaly that stretched days into months, and Luna came out of it changed forever... A mind-broken Princess Luna will have to recover from her traumatic imprisonment and torture with the help of her sister and her human lover as a pet/slave in an AU where sex and slaves are a part to Equestrian life (as well as big boobs and butts =3).

These tales are meant to be a fetishizing of love and affection that appeals a lot to me, and hopefully to you too.

This will be explored more in standalone tales.

[EDIT]
Updated cover art. I feel that the art of Luna that I had in mind (now commissioned) Is better suited for her stories that I intend to write down the line.

This is the Story of how Sunset came to destroy her. Later stories would focus on

Cover art now by bluse / antlrdkdlaos
https://derpibooru.org/images/789358