You look down to just above your crotch as four bumps begin rapidly rising. You stare in horror as the bumps become four pink teats.
Your dick begins to tingle. You can't see over your massive udder but you can feel your penis begin to shrink. At the same time your nipples become erect and the skin below them begin to inflate.
Your black fur starts to turn white but still leaving some blotches of black behind. Your ears stretch out into those of a cow's and your face elongates.
You dick is completely gone now leaving a vagina in it's place. Your toes form into hooves and your leg bones rearange themselves. You tear up as your insides change. Your stomach separates into four and you form a new reproductive system.
Finally the transformation is complete. You lay there for a second staring up at the ceiling. Then the restraints are released.
You try to get up and fall not used to your new legs. You try again and as you stand up you can hear the sloshing of milk in your breasts and utters. "What have I become?" you moan looking down on your bovine body.