Mary woke up, again feeling pleasantly content. She was on her stomach, and when she pushed herself up felt her udder hang from her stomach. It was like sleeping on an arm, and then releasing it from all that pressure. Some pins and needles, but Mary sighed as her new appendage moved freely. She looked around the room for Danny.
She found him, human once more, mixing chemicals in a barn stall. It must have been used for washing the animals at one point, there was a drain in the center of the stall, and the floor was rubbery. Mary almost slipped when she walked over, not used to her hooves just yet. They really didn't have much traction on wet surfaces.
"Whoa, nice save." Danny said, throwing a hand out to catch Mary when she stumbled.
"Thanks. What are you doing?"
"Just preparing a new batch of the 'Human' vial. I used up the last of it earlier this morning." Danny explained, pouring some clear liquid into a vial of blue liquid. Upon contact, it hissed and turned a harsh violet color, then faded to a light pink.
"There we go!" Danny said triumphantly.
"Who is it for?"
"Well, you. If you're willing to join the project that is. A dose this small will simply remove a few of the extra bovine bits." Danny explained.
"Which is what it did for you?" Mary asked, running her eyes over Danny. She stopped when she got to the rather obvious bulge in his pants. Danny blushed.
"Ya, kinda seemed like a waste to lose the family jewels. Besides, being just plain human is boring." Danny said.
"You think?"
"After you've been various animal-hybrids, you find that being human is quite boring. But that's just my experience."
"Actually, I sort of agree with you on that. I do kinda like this," Mary waved a hoof at her body.
"So does that mean you'll stay?"
"I'll stay, if you help me with something."
"Hey, that's what I'm here for! You name it, I'll see what I can do." Danny said. He set down the vials, and approached Mary. She took a step closer as well. The sight of Danny's growing bulge made Mary like her lips. She leaned in, and licked Danny's face, from his chin to his brow.
"That tickles!" he exclaimed, pushing Mary back while wiping her slobber from his face. But he was smiling the whole time, and his erection only became bigger.
Mary tugged his pants down, and found his bull cock ready for action. She pumped it a few time with her hand before inserting it into her twat. Her insatiable appetite knew no bounds. Her body was on overdrive, so in need. Every nerve in her nether regions seemed to be on fire, and begged for someone to calm them.
Danny grunted, and started to push up. Mary's cow vagina began to pulse, and Mary loved every second of the rutting. She was a slave to her new body. The only thing she could think about was mating. Her brain was slowly turning into that of a breeding cow. Hormones clouding her sensible mind, and the mind of a heifer taking control.
Mary's teats swung and dripped milk onto the ground. Her penis was being stimulated between her breasts, and her balls were getting pounded as Danny's humping got wilder. She loved the feeling, and mooed for more. So Danny reached a hand out to pinch her tail.
Mary bellowed so loud, she was sure she'd have shattered a few windows of vials. It was the most intense orgasm yet. Danny's penis pushed forward, the head expanding so its slit could open wide enough to release the load. Her pussy was overflowing with cum. Mary fell to her knees, and began to lather herself in the cum. Over her cow breasts, and over her own cow penis, which had released its own load after Danny's had.
"Alright, feel better now? Mary?" Danny asked. But Mary couldn't hear him. Her mind had gone blank, her body being wracked with wave after wave of orgasmic bliss. Her penis kept gushing semen, it seemed like it would never stop. The secret animalistic lust she had inside was taking control. Danny took a step backed and laughed.
"Another poor soul, trapped in their own fantasy. Well, I'll let her get on with it. I've got some more work to do. And there will be plenty of others along to help. I'd better write down her reaction." Danny thought. He wiped his head off, and stuffed his meat back into his pants. Then went back to work. He was jotting down a few notes about Mary's transformation when someone else pushed open the barn door, letting the morning light pour in.