You stand in awe of what just occurred before your barely believing eyes for a moment or two as your forehead tingles where the creature touched you. The sounds of the forest do eventually snap you out of your wonderment, however, and you realize that you still are very much in a dangerous situation. Much more dangerous then you'd previously reckoned, it seems. You begin your walk again, turning back the way you came, but avoiding the fairy ring. As you stroll your head feels strange. Your forehead continues to tingle where the unicorn touched you, causing you to reach out and touch it. What you feel there causes you to gasp a little. A strange boney circle seems to have formed in the center of your forehead. As you touch the area, you can feel it beginning to shift and bulge slightly. Your go slightly cross-eyed as you watch a single unicorn horn come into view on your forehead. Your pace stops and you stand there, heart beating fiercely as you stare at the newly grown appendage. You shake your head, as though trying to loosen it, but it remains stuck fast to your head.
"No...no no no this can't be happening." you say as your hands ball up into fists. You try to touch the thing again, to grab and try and yank it off your head, but you find that your hands refuse to unclench. You bring them before your face and watch as your fingers begin merging together and a hard film coats the backs of your hands and slowly surrounded them entirely forming into hard hooves. Your toes clench up as well and you can feel your feet shrinking as a similar film begins coating them. You begin feeling hair growing on the back of your neck and up to your head, and near your shins, causing your socks to bulge from the newly acquired hair. Your forearms, too begin sprouting long, silky strands of hair. Against your will you rise up on the balls of your feet as your legs change form, giving you a digitigrade stance that makes you hunch forward slightly.
"Please...stop this!" you cry out to no one in particular.
"Nothing can stop this." you hear a gentle female voice say, or perhaps feel, as the voice seems to be coming from your own head. You turn and look around to see the unicorn from earlier standing on the edge of the road and staring at you. You take a few awkward steps towards her, your rear and thighs thickening even as you step.
"What's going on?" you ask.
"You were trapped in the fairy ring. I helped you. But there was a price. Our secret has been kept from your kind...former kind...for ages. That secret must be kept at all costs, including the cost of your humanity." she says to you. As she speaks your feel your legs and arms lengthen, your arms forming new joints as they do and causing hold ones to disappear. You wince in pain as your expanding form strains against your clothes. You can feel a horse tail forming at the base of your spine, causing more discomfort as the seams of your pants begin to strain.
"I promise I won't tell anyone, just reverse this." you say to her. She doesn't respond, instead she simply watches as your body lengthens and barrels out. Your clothes finally give up the fight and rip asunder as your spine readjusts itself. You watch your face elongate and feel your mouth and teeth change. Your eyes blur as your eyes change and move as your skull reforms. You stand on your hind legs, trying to keep standing on them, but it's a useless effort. Soon gravity pulls your down to four legs. You crane your neck and look behind you. Your body is covered in white horse-hide and, as you shake your head your feel a mane flop out along your newly lengthened neck. You look over at the unicorn and try to speak, but your mouth won't form words.
"Think to me, don't try to talk." she says to you.
"Please, turn me back." you say to her. She shakes her head.
"No, you belong to these woods now." she says and approaches you "Still, you will find it isn't so bad. You were doomed, after all, the moment you entered the fairy ring. What you are now is no worse then what would have become of you had you stayed trapped in there." She circles around you and presses her body against yours, nuzzling your face with her own. "You will come to love what's been done to you, and help to increase our dwindling numbers. Now come, my love, I've much to teach you.