Erotic Equestria

From the introduction:

Ah, Equestria! Land of peace, harmony, adventure and… horse dicks and in-heat mares? What the- oh. It seems we’ve taken a small turn from the normal Equestria into a variation that prioritizes the more ‘intimate’ aspects of friendship. Regardless, there are many interesting adventures to be had in this world, a bit more lewd though they may be. Your stay here will begin just a day before Celestia’s student, Twilight Sparkle, is sent to the small town of Ponyville to help organize the Summer Sun Celebration. The poor, pent-up bookworm will hardly be prepared for a demigoddess with a millennium of unfulfilled desires, but that’s hardly your problem, now is it?