He decides to start by adding a cow's vagina to his body while still maintaining his human bladder so he could control when he used the restroom. He had to desire to shit uncontrollably and if he needed to pass waste or pee he might as well have a way to do it, he had no desire to get his dick back or get rid of his glorious udder. So a female cow's parts it was.
Going to the chronivac he looked at all his options again and selected the one he wanted. To be on the safe side he decided to engage reality shift, too excited about becoming more cow like he didn't notice when he made all the changes permanent.
Finally feeling a tingling centered around his asshole he moaned in pleasure as it began to change, except his moan sounded more like a moo. As the pleasure intensified he moo'd again "MOOOOOOOOOOOO OOOOOOoooo" finally the pleasure stopped he now had a cow pussy as well as his udder.