You see a bull in the far off pasture. You are captured in its gaze... You walk over to him. He seems equally interested in you. But all of a sudden you feel a sharp pain in your stomach.
Your clothes feel tight. Because of this you pull off your shirt, and you see what the problem is. Not only are you growing incredibly stocky, you are also growing an udder! You see the long teats coming outward, and your flesh turns a pink colour as it flops out. You feel milk begin to rush into your new appendage. You sprout hair all over your body, and you get knocked on all-fours by the bull, who now has a huge erection. You smell his arousal, and you also feel turned on. You don't realise that your dick has now disappeared, being replaced by a cow vagina!
You feel a tail mould itself out of your behind, and your anus and vagina find themselves underneath the tail. Your fingers clump together and stiffen to form hooves, and your legs become bestial. Your face rearranges itself into a muzzle, and your ears grow out, as do a new pair of horns. Your eyes darken, and your face blankens. You are now a cow.
You are now focused on the bull... You want his strong body inside of you, and you want to feel his calf growing inside of you... You offer him your rump. He mounts you. You feel more and more complete as he works his long shaft further inside of you... He takes it out and goes in again, harder. He repeats and repeats until...
You feel a gush of liquid fill into your womb, and with that, the moment was over. There was so much semen inside you some leaked out of your vagina. The bull licked it clean for you.