Ty groans and strokes his pulsing cock faster and faster as fur grows all over his body, his feet becoming hooves while a massive horse dick grows to 25 inches between his legs. His balls grow, enlarging to the size of grapefruits, making him even bigger than the biggest stallion. He lets out a loud neigh as the transformation completes once his face expanded into a horse's, his body now a huge black equine, his eyes glowing red. Ty looks at Rach and snorts, his new body horny to fuck something.
"T-Ty?..." Rachel laid on the ground with shock on her face, too scared to even try to run from the new horse beast.
"MUST FUCK NOW!" Ty roars, his new voice deep and powerful.
Rach just lays there, looking at the big black stallion's enormous horse cock that was ready to breed her. The sight of his huge monster made her pussy wetter and hotter by the moment, her mind still trying to comprehend what was happening.
"FUCK ME TY! PLEASE...I'LL DO ANYTHING YOU WANT..." Rach whines like a bitch in heat, getting on all fours and presenting her tiny white butt to him. "PLEASE TAKE MY PUSSY LIKE THE SLAVE BITCH THAT I AM!!!"
"YEESSSS!" Ty drools, and steps closer to Rachel to smell her sweaty cunt. He rubs his nose against her slit and sniffed deeply as she moaned with lustful desire. The scent of sex made him hornier by the minute, making him reposition to have his flared cock tip prodding her much smaller pussy lips.
"OOHHH GOD YESSSS!!!" Rach moans with delight, no longer being scared anymore from the new hellish world. Her teenage mind finally broke to accept her fate.
"ARRRGGHHHH!!" Ty huffs and grabs her hips tightly, plunging half his thick horse dick into the teen's warm, moist snatch. He starts fucking her slowly at first, enjoying how tight and hot the girl was, wanting to make sure he didn't break her.
"MMMMPPHHNNN!!!!" Rach cries out as the large stallion pounds away at her, her pussy getting stretched to its limit. "FUCK TY YOU'RE TOO BIIIIIIIG!!!!"
"OH YEAH, TURN INTO A HORSE WHILE I BREED YOUR CUNT WITH THIS BIG BLACK MONSTER DICK OF MINE! OH SHIT, IT FEELS SO GOOD WHEN YOUR PUSSY GETS STRETCHED BY MY HUGE COCK!" Ty yells out which causes the saliva from his horse mouth to fling onto Rachael below him, shooting precum into her pussy as he reaches a hand to cup some water from the tainted stream to let the human girl drink from it. She drinks several sips before her whole body starts to violently shudder.
"MY BODY FEELS SO GOOOOD!" The teenage girl screams as she starts to transform, her ass and tits growing larger until they are both the size of large melons, along with her legs becoming thicker and more muscular. "I'M GOING CRAZY FROM ALL THE SEXUAL ENERGY IN MEEEE!"
"EMBRACE THE CHANGE!! BECOME MY BEAST WIFE!" Ty's upper lip lifts up as he neighs again, his cock pumping faster and harder as it fills Rachael with a massive load of cum. By the time his climax was near, Rachel was almost a complete horse beast as her face expands outward into a horse face. "OH FUCK! I'M CUMMINNGG!"
"YES, OOOOOHHH, I LOVE THE WAY YOU MAKE ME CUUUUUMMMMMM!!!" Rachael squeals loudly while getting her pussy bred with horse semen. She was now a beautiful, black fur horse beast like Ty. A perfect mare just for him. Ty finishes cumming and pulls out of Rach, letting out a very loud neigh to assert his new found dominance.
Rachel lays there, her pussy filled with horse cum, her body exhausted from the intense transformation and sexual energy she has been feeling since Ty fucked her. Ty snorts and takes a moment to think on what to do next...