A Season 5 Finale Bad Future.

Sombra has won the war against Equestria, in swift and brutal fashion. What ponies didn't die were captured and converted into more soldiers for his army. The Crystal Empire fell first, and soon after, Equestria itself. And now, Sombra is free to do as he pleases with his captives.

First, the Usurper-Princess of his Crystal Empire. Next, the ex-Princess of Equestria. Finally, a mysterious time-traveling alicorn from a different future. All have been captured, and all will submit to the will of Sombra, whether they wish to or not.

Contains: Mind control, mind wipe, creampies, heavy cumming, light cum inflation, cervical penetration, impregnation, some bondage, some public use, humiliation, and despite the cover image, a lack of Princess Luna, as the inspiration for this story does not feature her.

Cover art from the IDW comics, done by Andy Price.
Inspired by Browned Toast's heavily-NSFW "S5E25 Bad End" image set.