With a loud *RIIIIIIIIIIIIIIIIIIIIIIP*, Jack's pants finally give out, freeing his powerful equine legs. With a groan, he pushes himself up onto his new hoofed feet, his strong butt muscles flexing in the process, releasing his silky tail from his pants' rags, and leaving only a small shred of clothing still hugging tight his groin.
His new ebony penis, which now looks to be as thick as his forearm was, retreats from its dangling, peeking position into its new sheath: sensitive, mahogany folds of flesh that crawl up his belly as a tube and cover-up his once human bellybutton.
Taking hold of the last remnants of his pants that fearsomely confine his enlarged genitals, Jack rips them off in one great motion, whinnying as his chest's muscles and swollen biceps flex beneath his new short fur. Sighing, his balls finally freed from their constricting confines, he watches as his sable sack droops heavily downward, swinging between his legs, carrying in each side a grapefruit sized tentacle filled with his copious anthro seed.
Carlos, Jack's Hispanic buddy, has stopped his screaming meanwhile, and has begun to remove his own clothing, his hands roaming across his tanned body as he curses about his itching skin and tight pants, fears being expressed with the audible curse, "Shit man, fuck, I'm changing too!"
Spotting the dropped Playboy on the ground, Jack can't help but feel something primal, newly awoken in him, animal lusts merged with his human mind. Picking up the magazine, he revels as he senses his enormous dick begin to fill with blood and stretch its way out its wide sheath. "God, I'm big." he almost chuckles proudly to himself, his new long, meaty male appendage sensitive across its amazing length; the cool air outside his sheath caressing it as it grows, sending shivers down his back that cause his mane to twitch.
Taking hold of his cock with his free hand, a good two inches spacing his thumb and fingers, he strokes it, urging it to grow harder. "Oh, yeah..." he moans, his eyes darting from the Playboy that has captured his animalistic passion and his friend, Carlos, who's beginning to look worryingly uncomfortable in his tight pants as his body accelerates its transformation.
Suddenly, Jack catches whiff of something distracting outside. Apparently, one of the officers has purchased an Arabian mare and is keeping her in camp before shipping her back to his ranch. Worse yet, Jack detects that she's in heat. As if someone had flicked a switch below his waist, Jack's cock immediately stiffened to rockhard.
Faced now with a tough dilemma, Jack fights against his new urges to run out into the night, and under cover try to satiate his lusts with the mare, or to tend to his changing buddy, Carlos, and try to relieve his overbearing lusts later (by himself if he has to).