Brad's new equine instincts made the nearby fields call to him, a vast open plain with only a simple wooden fence between it and the highway. He slowed down his car till it was at a complete stop on the side of the road near the fence, and then his stomach grumbles.
"O-Oh shit, I gotta go..." Brad rubs his stomach and slighly arches for his butt to be hovering above the seat, and he starts pooping all over it. The stench wasn't disgusting, it was intoxicatedly amazing to him. He gets out of the car and stomps his hooves, dropping a few more turds before leaving his car for good. "Ah much better. Now I feel at home."
Brad easily leaps over the fence and walks around the pasture, the cool night air gently blowing on his fur to make him feel refresh after being in a stuffy car for so many hours. He takes both hands and strokes his horse cock, slightly squatting down to empty his bowls completely. He groans and then neighs, shooting 5 thick ropes of cum as he finishes shitting a nice pile of feces onto the dewy grass.
"Damn this is so nice! But it's kind of lonely out here by myself." David said out loud, looking around at the big open area. Maybe some more travelers will stop by after noticing his car parked to the side, or even better, some more anthros just like him to hang out with.