They knew that once his feet and hands were hooves he was essentially helpless. Ben felt the changes in his toes; he could feel a coldness spreading over them - with great difficulty he flipped himself onto his back and tried to lean up to see them. His manly shape of thin hips and wide shoulders was just starting to vanish - his legs were the proportions of hind legs and now the toes looked hard and dark. Hair was growing down his lengthening feet, and he could only kick as his dick grew again.
"Agggh! HaaaaahWWW" he cried and stopped realizing he had involuntarily made his first donkey noise. His pubic hair had dropped out, and grey donkey fur now closed in around his genitals, which were dark and large. The humiliation was unendurable as the blonde woman laughed and pointed at him.
"Look, he's got a donkey dick! Look at his balls growing! They're just full of jack ass sperm by now I bet!"
The thought was terrifying, that his balls were now incapable of producing human sperm and he kicked harder, letting loose a terrific deep bray as he did. His fingers were curling into fists, which he could only stare at though eyes that were slowly changing. Long eyelashes and heavy lids invading his face. His cheekbones seemed more pronounced and that same gray hair was now covering his cheeks, crawling onto his face and into his hair that lay plastered to his forehead with exertion.
"Plllease!! HAAW HEEEEEELP HAAWWWW MEEEEEEE!!!" he bellowed. His thicker neck was starting, and the voice box inside was larger, more resonant. His voice deeper, and his lips now not forming words properly as they gained rubbery proportions.