"I can't believe this, I can't believe this, I can't--" Alex stammered to himself until slapping his own face to stop said stammering. This selfsame tactic proved just as useful now as it had in the past during comic con freakouts and midnight cinema premieres, only with the added strength of a rough, calloused, strong centaur man's hand, it actually hurt this time.
"Ow!" Alex gasped, his own voice sounding alien now. Well, not so much 'alien' as 'impossibly deep and sexy man voice that could never in a million years describe his own default nasally trill.' "What does this mean? T. H. E. Author's books are based on real life, a parallel reality--did he hail from there and come to Earth? If so, why, and how? How does magic work, since it must be real if all the rest of this is? Or... Wait, what if Author is some kind of otherworldly being native to neither Earth nor this world, and instead created this one while living in ours... But then, why live life as a reclusive human writer when you could have your own world to play around in? Nothing about this makes any sense..."
If Alex hadn't been so caught up in his reasoning monologue, he may have noticed Matt enraptured by vines further up the slope, or Jeff becoming decidedly more bovine by the second a short ways away on the grassy hillside. Alex might have also realized that his own transformation was not quite finished, as his newly thickened locks continued to grow, creeping and then sweeping down his neck to crash around his narrowing shoulders and cascade down his upper back and tickle the uppermost reaches of his softening, swelling pectorals.
"The rumor said that anyone who can find the secret gateway into the setting of Author's books will be transformed to better suit that reality, so I at least know that part is true," Alex mused further, scratching the rugged stubble of his square jaw, both of which softened and sculpted themselves into smaller, smoother features in an increasingly feminine face, eyelashes thickening and lengthening, nose shrinking and turning up the slightest bit at the tip, lips plumping into fuller, far more kissable proportions. "And for the rumor to exist, that must mean that people returned from here to Earth. And, since the rumor persists but there haven't been any tales of random mythical creatures roaming the suburbs, that must mean that humans change back into their original forms when they return. If that's the case, then I'm most definitely NOT stuck here or as this centaur, so I should enjoy this once-in-a-lifetime opportunity and explore my favorite book series in person!"
Alex reared up on his hind legs and let loose a whinny of a cheer... Realizing too late that the whinny was much, much higher pitched than he had anticipated, not to mention how much 'he' was becoming less and less an appropriate pronoun by the moment from a purely biological standpoint, and soon after a personal one as well. As Alex's forelegs came crashing down, hooves stomping in the soft grass, so too did his expanding bosom pull the rest of his torso further before bouncing back up, wobbling and jiggling like crazy, inertia refusing to leave the inflating fun-houses of soft, supple flesh as they grew bigger, BIGGER, and B-I-G-G-E-R still.
"What's happening to me?!" Alex whinnied, as if it wasn't obvious, his voice now a high-pitched sing-song more befitting a pop starlet then a scrawny male college fantasy nerd. His hands, shrinking and smoothing at the tips of thinning, newly hairless arms flew to cup the ballooning breasts blossoming from his human torso, his equine torso down below shrinking a bit and streamlining itself, muscles compacting into wiry bundles of tension rather than bulking meat houses, huge horse dick shrinking and moving back, slurped up by a hungry (and growing hungrier) new slit below the lengthening tail. First one humongous testicle followed the swallowed, repurposed shaft, prompting Alex to cry in an unbidden onrush of near-orgasmic pleasure, then the other, both reworking themselves into a womb and ovaries swimming down the river of the new vaginal canal.
"No, no, no!" Alex whimpered, stomping his hooves, wringing his hands, and not knowing why. "Why a mare?! I had a rocking man's body, why couldn't I have been the stud for once in my life?! Now I'll never have a cock that huge and hung again..."
Alex's new sex warmed and slicked itself as the mere mention of a thick phallic lentgh, quivering with a growing emptiness, need, HUNGER welled up inside Alex's equine body and human torso alike. Waves of demand washed through Alex, his breasts craving large, firm hands to grab and knead them, to run fingers through her long, majestic mane, to kiss her so deeply on the lips and plunge far, far deeper into her willing, ravenous, fertile--
"No!" Alex shrieked as she realizes that not only was she now unable to refer to herself as anything other than a 'she,' the final changes of her transformation were further reshaping her mind. "I'm not Azalea Swift-Hoof! She's a character in a book I read in college, as a human MAN, not a buxom, beautiful, noble centauress out on a quest, to save the land, and..."
A glaze crept across Alex's--or rather, Azalea's--eyes.
"I'm not Alex anymore," Azalea realized aloud, the glaze fading. "This place didn't just take my body and sex, it changed my whole personality! Am I even me anymore? What does that even mean any more?"
Her breasts ached, her pussy once again twitching, demanding attention.
"And why am I in season?!"