"I... I..." Rob stammers, jaw hanging open in quivering shock. He was turning into a bull. He was honest to God, turning into a bull. His brain could hardly comprehend what was happening, but it was nevertheless actually happening.
"YoOOOu...?" Mary prodded, sly smirk on her cowlike maw looking almost surreal - but oh so enticing to his changing inclinations. He couldn't help himself. She was... she was gorgeous, she was raw, bovine sexual appeal and he could hardly resist. His body responded in kind, his arousal becoming obscenely obvious to her. He could smell it, smell it in himself and in her, and he knew she could smell it too.
"I... can't... hoooves..." like Mary, his hands and feet had become hooves by now, and his erection strained against his pants. He fumbled at the waistline futilely, frustrated. He needed release, he needed her, and here he was, stymied by a simple pair of pants.
"PooOOOr baby..." Mary lowed, and got up from the couch, clopping her way over to him. She knelt down, and bit into his belt, thankful that he was wearing a fabric belt and not leather, considering what they both were now. With a yank of her head, she tore the belt loose, shredding his pants some too. He managed to do the rest, shoving his hooves into the waistline and pushing outward, tearing his pants free.
It was finally time. His willpower had broken, the animal in both of them overriding human rationale.