The Horse Center had just called him at the last minute and said that they needed someone to pick up some extra hours cleaning stalls. Benjamin couldn't resist, it was his favorite place on the planet. He thought of all the times he cleaned stalls and wondered what it would be like to be in one of them as a horse. The idea of living in such a place and being a horse was beyond his wildest fantasies. It would be perfect for him, or so he thought.
He got there and started his work immediately. He began to clean out a stall and the more he cleaned, the more he got into that zone of being completely focused on his task. He did this all day long until it came time for his lunch break. He took a break and started to walk around and check out the horses, like he always did when he was there. He stopped at a horse that was eating, and just looked at him. It was an amazing sight for him. The horse noticed him standing there and looked over at him, then went back to eating. He thought to himself as he walked away that it must be so nice to not have a care in the world like that horse does. But, his mind quickly got back to the fantasy that he has always had, thinking about what it would be like for him to be a horse, just standing there eating. It wasn't long before his mind started to wander off again, back to the stalls.
He thought about being a horse, about being in the stall with no clothes on. Being naked as a horse in the middle of the floor of the stall. He started to really think deeply about this as his mind wandered off thinking about how wonderful it must be to be a horse. How wonderful it would feel to be one of those majestic creatures. Then a sensation started in his feet, he felt them starting to grow and morph into hooves. He couldn't move and just kept sitting there as this happened, he was terrified at first, but then was overjoyed as his feet were changing into hooves. Then it started in his legs and worked its way up his body. He didn't know how this was happening, but it seemed to be very natural. It was like a light was growing inside of him, filling every part of his body and changing him into a horse.
Then it moved to his groin area and started to change his penis into a horses dick. It started to grow longer and thinner, the head of his penis starting to turn into that knot that you see on a horses penis. His testicles were changing into the scrotum of a horse, they were turning into two long bean bag shaped testicles that hang below his new horse dick. Then he felt his asshole start to grow wider and fill with hair, and felt it starting to turn into a horses anus. Then the sensation moved up his stomach and chest, turning his nipples into teats and his belly button into that round scar that you see on the belly of a horse.
He felt his arms turning into the front legs of a horse, including his hands changing into hooves. His body was completely hairless now and he had a thick layer of fur all over his body. His shoulders were changing and his collar bones were growing wider. His back was changing, as was his chest and torso. He could feel his body elongating and becoming more muscular. His neck was getting longer and stronger, the muscles in it were becoming very defined. His ears were changing into the ears of a horse and his face was changing into the muzzle of a horse. His nose and mouth were changing and he could feel his tongue elongating and changing. His teeth were becoming horse teeth and he felt four new teeth coming through the front of his mouth.
His skin was itching all over his body, as it was growing hair to cover his new horse body. His cock was dangling between his legs and he could feel the weight of his scrotum. His penis was very stiff, and he felt like he needed to cum. He felt all of this happening and he couldn't control it. He was transforming into a full on horse now, and there was nothing he could do about it. It wasn't scary to him anymore, it felt very natural.