Desire and curiosity get stronger as you catch the bull's heavy musky odor. You go to his gate while you still have partial use of your hands, and awkwardly fumble with the latch. The huge male is pressing against the gate, and it pops open when you finally get the latch undone. The impact startles you, and you drop to all fours. Your upper body and head are still changing, but your hindquarters are fully transformed. You feel hot and slick, the heavy black lips of your female sex clenching. A stream of urine shoots out your rump, which the bull sniffs.
You suddenly have second thoughts about this, but it is too late. The bull bellows and lunges, throwing himself over your back. The sudden weight almost makes your arms buckle, but as he thrusts into you, a ripple of change thickens bone and closes up the last of your hands into cloven hooves. A second thrust causes your head to thicken and your face to push out, and when he erupts inside you with a massive gush of semen on the third thrust, you complete the transformation into a cow.