"Have you ever heard of a humantaur?" She said as she began typing away
"Like centaurs but their lower half is another human" Jeff said confused
"Well what if I told you that I like a specific kind and that I want to know how it feels to be one?" Jenny said as she hit enter
Jenny then stripped and made Jeff do the same, Jeff knew what they were to become but he didn't know what she meant by type. Suddenly Jeff began growing and bulking up as he reached seven feet and his muscles were bodybuilder level.
"Hey there sexy man." Jenny said to him
"So when's my backside coming in." He asked
"In a moment~" She said as she wandered behind him and began playing with his asshole.
Suddenly hair began sprouting on his crotch growing a massive thick bush around the small cock on his quite large frame, suddenly the hair began crawling upwards making an impressive treasure trail as the hair spread across his stomach and to his back as the hair began to crawl down his legs and over his feet and toes, the hair then got to his chest as it made a carpet over his manly pecs as the hair on his back crawled over his shoulders and down his arms over his hands and fingers and under his arms making bushes. Suddenly an itch on his face showed that a beard grew in as his sideburns grew down and mustache came in as his whole face restructured to some strange handsome man with green eyes. His crotch began to stir as his cock began to twitch as it bursted from his crotch and grew massively thick on his crotch as foreskin piled over the tip, his cock must have been 6 feet long because it touched the ground! He thought how the cock had to be about 10 inches thick before his balls began to tingle as they swelled in their hairy sack reaching beach ball sizes.
"Isn't this a bit much?" Jeff said turning to Jenny behind him only to see her head squeezing into his asshole as her hair trailed down her back, suddenly her shoulders melded with his ass as his ass dwindled away as hers grew larger as her body jolted around as her arms crawled their way onto his sides below his arms where they began to beef up and match his arms as hair grew over and under the arms. He still heard moaning but he didn't know where as he felt her trail of long hair reach his head as the hair in the middle of his head lengthened as the sides shortened giving him a pretty long mohawk mane.
"Hey Jeffy..." he heard
"Jess? Where are you?" He asked
"I'm not really Jess anymore, I'm a part of you now! This is in your head because we share a brain now." She said
"I thought that you'do make a second head for yourself or something." He said
"I may do that later but now here's where the fun begins..." She said
His lower body which used to be Jenny's began to bulk up as the hair from his scrotum began to do a reverse treasure trail as the thick long hairs hung down the center of the body leading around the vagina as it became completely engulfed with hairs as the hair began spreading all over the body as the feet and legs matched his as the asshole inflated a bit looking more like a donut between the thick hairy cheeks. A bulge began to form in the stomach as the vagina convulsed before shooting inside out into a sack before two yoga ball sized testicles grew in the massive hairy sack as the bulge died down as the now massive head of the clit grew some foreskin over it before being shot out growing to 7 feet long and a foot wide.
"I hope you enjoy our gift that Jess gave to us..." The new secondary Jeff said as it controlled an arm and stroked the new massive cock.