John was still mesmerized by the vary large sexual equipment, even his newfound youth almost forgotten as he stroked his impressive cock. He'd been average all his life, looking small in comparison to the boys lucky enough to have above average endowments. Allysia chuckled. "Men and boys. You always get fixated on one toy." She reached out to stroke John's swelling length again, and he gasped at the sensations. "Since this is a clothing optional resort, let's not even worry about covering this up."
John gaped as his already swollen shaft continued to grow, 10 inches, eleven. The end started to flatten and his foreskin thickened at the base, pulling up towards his belly. Below, his tetsicles enlarged and darkened. Allysia grinning at his stunned expression. "So many males want to be hung like a horse - I am giving you that as a gift!"
When she stepped back, his partially-erect penis was a thick black shaft at least 14 inches long, with testicles like tennis balls swollen inside a taught black scrotum. There was no way he could wear anything that wasn't custom-made to accommodate the incredible mass of his stallion's equipment. John reached out to heft the meaty organ, eyes wide.
"Mayve a few cosmetic changes to go with your new look?" Allysia ruffled his hair, tugged gently at his nostrils, and slipped fingers into his mouth to slide over his teeth. A shiver went through his entire body, followed by a wave of heat and then a curious ripple of muscles that stretched him up several inches. He gaped in the mirror as the once-familiar boy for his past vanished. When the changes had stopped, there was a very strange-looking sexual freak staring back at him. She had darkened his hair to glossy black, and his face had a very elongated, equine look to it. Large, squared teeth in wide mouth, broad nostrils, and large, wide-set eyes that were liquid brown with rectangular irises. His body was more muscular, with bigger hands and feet that had thick black nails, and he discovered he had a full horses' tail that he could twitch and flick at will! However, even the horse-like appearance could not distract from the massive, black sexual equipment. He used both hands to slide his freskin back, shuddering at the intense sensations, and began to masturbate himself.
Climax did not take long, but he shot an impressive load that splattered against the mirror glass. A strangled sound much like a whinney came from his throat as his mind banked out with pleasure. Allysia watched the boy with a grin. When he seemed to have recovered enough to stare at her with wide eyes and a big grin of his own, she asked "So, Johnny. Why don't you go explore the Resort as you are for a while? We can make any other changes you wish, but I think you should get used to this look first."
Awareness finally came back in full, and John stared at his bestial, grossly endowed image with a mix of horror and amazement. "But, I cannot go out like this! What if my family sees me! I'm a freak! A sex monster!"
Allysia chuckled. "That you are. But no one will know who you are. You will be assumed to be one of the many specialists we have here at the resort to cater to all different desires. I expect you will be asked to demonstrate your prowess with centaurs, horses, cattle, and other large animals, and find yourself being masturbated by males and females of all types and ages. Doesn't that sound like a fun vacation? Sexual pleasure that is almost non-stop, no responsibilities or cares, admired and envied?"
While this was certainly not something he would have thought of himself, John and to grin at his reflection. It was pretty amazing, if freakish. Hell, he was already starting to come erect gain, and his swollen black balls appeared to have a lot more to offer.