You are Jason Karras, a human doctor that arrived in Equestria after a mountain climbing mishap. In the year that you lived in your new home, adapting your lifestyle and medical skills was easy. During one estrus season, a malevolent force decides to take advantage of things, driving the population of mares into a frenzy. The stallions are frightened and Celestia grows concerned. To your surprise, Celestia, viewing you as a creature she could trust, tasks you with satisfying the mares and keeping them from causing too much damage.

Shouldn't be too difficult to handle, right?

Contains: Estrus, Sex-crazed mares, demonic possession, and Comedy

Inspired by the movie: The Exorcist.

Written as a collaboration between me and my friend Israel Yabuki.