Nathan held the amulet in front of him and wished for Mitch to be just like he was, a well endowed donkey. "Let's see how you like this!" Nathan said as the amulet glowed.
Mitch felt his whole body changing at once. Fur sprouted everywhere, making him itch all over. His whole body swelled with new mass, stretching his clothing. Mitch tried to take off his clothes, but was not quick enough. A loud rip, and shreds of fabric fall to the floor, revealing Mitch in his furry nakedness.
Nathan smiled as Mitch kept on changing. He fell to the floor and grew thin, furry legs. His ears stretched to the top of his head and wobbled as Mitch's face grew into a muzzle. Mitch had been pleading with Nathan to not do this, but soon, he could only bray his dismay. A long thick tail with a dark tuft at the end snaked its way down between two muscled buttocks. Finally, Mitch felt his genitals swell and grow. He marveled at how wonderful they felt.
Mitch was now a donkey, aside from the nice set of genitals, he wasn't too happy about this. He suddenly didn't like not being in control. Nathan walked over to Mitch and patted his thick neck. "There, there my boy, the changes aren't done yet." Nathan said with a devious grin.