As far as near-anyone is concerned, Justin is a simple stallion. What they don't know, what they can't know, is that the once-human doesn't eat like other ponies. Gasps, moans, the bliss of another pony's orgasm... those are his sustenance, and he needs them to stay alive. It hurts his partner though, every time, and he can't stay with one pony for long. How much can a mare take before she falters?

And what happens when he meets a pony that he wishes to sleep with again and again?