On his ride back to the hobby farm he and his wife owned, Jason was pretty satisfied with what had happened. He thought back over the last few minutes with his horse. Once spent, he had slumped over the back of the horse, utterly satisfied and empty if any thoughts, with a tired smile on his face. The horse didn't seem to mind what had happened. He stayed there for a minute or two until he softened up, then pulled out of the horse. With his penis out of the horse he pulled his clothes back up and got back on the horse to ride home.
Back in the present. Jason was musing to himself that whatever had caused that intense heat, he didn't really mind. He had gotten to break through some personal inhibitions and he felt freer as a result. Maybe he would make this a regular thing. As he thought that he felt a slight tugging in his groin.
It was kinding of like his penis was getting pulled closer to his body. He thought it odd but didn't bother to investigate.this feeling continued for the better half of ten minutes til he felt his penis resting where it shouldn't be, closer to his stomach.
He decided to investigate and hopped off the saddle. Upon doing so and dropping his pants, he saw something that genuinely surprised him. he now sported a pink hairless sheath where his penis once was it was loose and wrinkly but human sized and as previously stated, pink and hairless. He stared at it for a few seconds wide-eyed, not sure what to do.
After his initial shock subsided, he decided to investigate a little bit, he proved inside the hole at the tip and felt a penis inside of the sheath. Not sure what to expect, he squeezed and stimulated the sheath a bit, trying to arouse himself. Having difficulty with this, he thought of his wife's pussy and some of the hot sex they had had. That still did nothing. Finally, out of ideas, he decided to step behind the horse and put his face in its pussy to see what happened. His cock immediately started to stir. He inhaled deeply and the musky smell of the horse had a subtle scent to it he did not detect before, of sex and wanting to have sex. The horses pheromones were obvious to him now.
With his mind addled from the sex fumes of the horse, his penis started to slither out. It was the same penis he had had for most of his life. Not sure what to make of this, he decided to question it further later and appreciate the fact the sheath was there now.