The grad student is only looking at the large black angus cow as she pulls it's guide rope, walking backwards out of the barn. You easily scoop her up from behind and pin her against the barn door, suspending her a good two feet off the ground. She drops her rope and Starbuck's coffee, and the cow just stares curiously at the two of you before wondering out and eating some grass.
This is the first time you've seen her up close, she's in her mid twenties and looks to weigh about 150 pounds, though with your strength you barely notice the weight.
"AAA, let me go you beast, I'll call the cops".
Concentrating on the structure of your bovine/human neck you respond in a deep voice, "not so confident now". You don't recognize the sound of your new voice, but feel happy that you have the ability to talk again. Her body is awfully small, it'd be easier to break it than try mating, but she is attractive, and you are still a human male, allbeit one who weighs 800 pounds and is designed for cows of equal size.
She screams again and tries to kick you in the balls. You wince in anticipated pain, but your thick leather hide has essentially deflected the blow. Raising her higher you apply a little more pressure "I thought you loved all animals", your throat aches a little from talking so much, "you should accept animals". With that you hold her up with one bovine hand and rip off her shirt and coveralls with the other, her flipflops having fallen off when she tried kicking you.
You lick her face with your large tongue and press your naked body against hers. She sobs and wraps her arms and legs around your upper body, and without room to build up any significant momentum hits the cluster of muscles at the back of your neck. Still crying, she grabs your mane of hair growing alone the back of your neck and pulls hard as you rub your muzzle against her face and wet her shoulders. You rythmically move your torso against her, pressing her into the soft wood of the barn, continuing to stroke her with your rough tongue.
Her orgasm is inevitable, "stop playing, hump me!". You carry her into the barn and toss her onto a stack of hay. Your member is fully erect and now freely extended forward without the interference of the barn door. Leaping onto the hay pile you grasp her arms and use your thighs to hold her legs in places. Taking a good look at you on top of her she closes her eyes and starts whimpering, you moosensually and put your mouth around her neck, forcing her to stare at your bull's head as you fuck her. Your penis easily finds the mouth of her vagina and you slowly move your tip in and out, and build up momentum.
The force of your thrusting and length of your penetration steadily increase, PITA girl is scared and in pain but does nothing but stare at your head in horror as long as she feels your flat teeth on her neck. You experience an intense sexual pleasure with each push in, but you know you won't get all of yourself into this bitch before this is over and think of finding a willing cow.
You turn her over and keep thrusting, she screams again as her back suddenly arches and legs seperate even more. Her body mass seems to increase and a short layer of hair seems to comer her sweating body. Your thrusts are going even deeper now, and you find you don't have to try as hard to force yourself in. She lets out a loud moo, encouraging you even more, now thrusting in with your whole length. Her vulva suddenly puts up a bigger fight, grabbing around your cock and letting out another burst of your valuable semen. It then relaxes, telling you to pull yourself out and let your sperm do its job.
Standing triumphant over your conquest you let out a mighty bellow. The grad student is face down in the hay, crying in what sounds like short moos. You notice she's now much larger and sports a tail sticking straight up over her swelled cunt. You don't feel as satisfied as you think you should, and go out into the field, leaving the girl in the hay.
In the nearby farmhouse a woman professor pours a drink from a well stocked bar. "I can't wait to show this to my colleagues in the government and other research universities, this will be the start of a new vegan age, I'll probably even get a Nobel prize". The grad student would soon give birth to another minotaur, hopefully male, and would be invaluable in perpetuating the species as she only had the funding to research two minotaur serums, one male, one female. Using it on any others would just produce genetic clones that'd contaminate the gene pool. Putting away the coffee maker and empty serum vile she decides to let the male have some fun with the cows before having her real staff round him back up. "I'll have to know the gender of their calf before I can present him as an artificial insemination platform, the testicles he has now are far more valueable, if she's pregnant then I'll just have to worry about producing different serums for female progressive students in the near future.