Now fully garbed in the horse costume, pain in Chad's balls intensified. He let out an inhuman scream and broke into a full-on gallop toward the stables. The hot leather encasing him was gone. He was naked except for the rings around his balls. He felt the wind race by with his mane and tail blowing in the wind behind him. It all felt normal, except for the pain.
He didn't notice as he ran across the 40 acre pasture toward the stables that he had dropped to all fours. The world around him drained of colors. He ran in a monochrome world tinged red with pain. He heard his hard hooves cutting into the grass and soil as he ran at full gallop toward the stables. Wind raced across his naked flesh.
He ran first as a colt, then a yearling. He continued to grow, and so did the pain as the rings imprisoning his balls remained unchanged even as Chad's body and manhood - stallionhood?- grew bigger. Chad's agony was blinding. He ran and ran, ever closer to the last fence before the stables.
Suddenly, Chad stopped racing. The pain was too great, every move amplified the pain.
He froze facing the stables. His eyes stared blankly forward unfocused in total agony. He was vaguely aware of others moving near him but they were irrelevant. His world now resolved around pain- the pain. Chad's world was pain. It was like a vise crushing his balls- if only it would stop. Maybe his balls would pop?