Pressed against the wall, Kat moaned in a mix of fear and arousal as Dan rubbed his flared cock against her entrance, it was far too large to fit, but the magic still surging throughout the newly created minotaurs body would change that.
Kat gasped in horror as she saw her vagina begin to pulsate and wink, as it did her pink flesh darkened to black, her once petite folds growing thick and leathery. With each wink her entrance grew wider and deeper, within moments her vagina had become unmistakenly bovine in nature. "Fuck..." was all Kat managed to say before her breath was driven from her as Dan thrust in with a meaty slap, his huge balls slapping up into her ass as her breasts pressed into his hairy chest, and he began to fuck her.
As Dan began to plow his sister, her modest frame began to grow, her body swelling with fat and muscle, moments before her toes had barely touched the floor as she was fucked against the wall, but now her thick legs ended in hooves that easily reached the floor. As she grew increasingly horny Kats new instincts began to take over, she wrapped her arms around Dans thick neck and her powerful legs locked around his waist.
As Dans balls slapped into Kats ass it swelled with fat, his meaty hands kneading her cheeks as he thrust into her with abandon. Kats breasts soon followed suit and ballooned out into enormous orbs that crushed against his chest. Kat began to cum as a ropey tail sprung from above her winking asshole, her cow vagina sucking on Dans rod.
As horns sprung from the sides of Kats head she felt her breasts begin to bulge with milk, the creamy liquid squirting from her now elongated nipples. They were not alone, Kat let out a moo as a huge udder rapidly formed on her crutch, moments after reaching full size it too began to leak milk from the four teats protruding from its bulbous mass.
Her change nearing completion Kats head swelled in size, a muzzle extending from her face as she frantically kissed her mate. As her ears stretched out blond hairs coated her body and she ceased to be human. Now only a minotaur cow remained.
Both monsters bellowed as Dan began to cum thick ropes of bull semen into his former sister. As Kats stomach expanded with the impossible volume of semen being pumped into her she moaned in ectasy. After several minutes they slid down the wall, Dan sitting on his hind as Kat lay against his chest, his mighty cock plugging his cum within her, ensuring her breeding was successful. His sister was only to be the first of his cows, many more women would have to be bred to satisfy his bestial lust.