As he enters his tent and prepares for sleep, he suddenly feels very tired. More so than he ever experienced in his life. He can feel his heart rate slowing down, while beating deeper and longer. He immediately falls into a deep, dream-filled sleep as his head hits the pillow.
While sleeping, he dreams of wide open green fields filled with females of his choice. It seems almost bestial.
Meanwhile, his physical transformation begins. White fur starts growing on his belly and chest, and spreads around to his back, which fades to gray. His penis grows longer and wider, as a tail pokes out his rear-end. As he dreams, those sexy females seem to grow larger. Their multiply into six nipples along their bellies. Their ears grow larger as they stand taller on their heads, and their long blond hair seems to turn black, and become spiky down along their spines.
As he dreams, he becomes aroused. His penis grows ever larger, and becomes erect. He tails continues to snake out ever longer and hairier. Finally, his chest begins to barrel outwards, and his arms and legs straighten out and lengthen and stiffen at the same time. His arms, especially, grows longer and straighter. Finally, his sleeping and transforming body rolls over onto his right-side. As he rolls over, his longer and clumsier arms and legs ram into the side of the canvas tent, bowing it outwards and putting pressure on his shelter.
He sees the females before him start to grow hair all over their bodies. A nice, sexy coat of soft hair. Almost fur-like. Turning more and coarse as it starts to turn to animal fur. They are in a small group, laughing in a sexy sexy manner. Suddenly, he can smell them! They smell like golden sunshine after a cool spring shower in a large grassy field!
His penis continues to expand at an alarming rate, and it rides up his furry underside, nearly to his chest. It turns dark...almost black. It finally becomes monstrous. Beast-like. And it grows yet more as it begins straining for release.
His necks extends outward, further and further. His mouth expands and his teeth fall out, to be quickly replaced with larger, blockier teeth more suited for grinding on grass and oats, than for tearing into flesh. His nose flares out, and his tongue elongates. His lips turn dark, as rough white fur spreads out from his mouth and extends along his clean-shaven face, fading into a gray dun color. His forehead reshapes in order to allow his ears to migrate to the top of his head, as those expand upwards and turn just as hairy as the rest of him.
The females before him start to beckon him to them. They lick their lips with tongues that seem to grow larger by the second. They begin making strange noises as their human laughter fades away into more bestial groans. He approaches them with a heightened awareness of his own desire to have sex with these females. As he approaches them in his dream, Mike cannot contain himself any longer. His penis lets forth a fury of white semen.
His penis finally explodes forth against the strain, and makes a mess in his sheets. His body now grows wider, and his arms putting ever greater pressure on the tent. Suddenly, they shoot straight out, and lock into place as they destroy the integrity of the tent. The tent collapses down all over the sleeping hiker, failing to wake him from his arousing dream.
The girls start laughing at him at his premature eruption. Only it wasn't laughter. Not in the strict human sense. It was more of a guttural and nasally rapid breathing. They continue beckoning him further on, as they bend down onto their hands and feet.
Now completely covered by the canvas of his tent, Mike's balls are quickly filled with the semen of a donkey stud, replacing his spent human seed. His balls expand ever larger to make room for larger volume that his body will henceforth produce throughout the rest of his new life. A dark much thicker skin forms at the base of his penis, growing along its length; quickly replacing his human skin. It continues growing along the length of the shaft, much thicker than previously. It continues growing up over the head, becoming uncut.
Mike dreams of these females growing larger and hairier by the minute. Tails shoot out of their behinds, and ears grow and shift to the top of their heads. Suddenly, he sees a bunch of donkey jennets in front of him, and his body moves towards them. They turn around, exposing their anuses to him, with their heads bent backwards along their longer, more flexible necks. Watching his every move, and beckoning him to take them from behind. Unaware of what he was doing, he walks towards them, feeling sexual desires growing stronger with each step he takes.
His penis grows once again in response. Only this time, it grows to an even larger giant than it was before. Fatter, longer, and smellier than before.
As he walks up to his first female to claim her for himself, he suddenly becomes aware of his ultra arousal. Much stronger than ever he experienced in his life. So strong, he slowly wakes up from his ultra-realistic dream and feels like he is buried underneath something.
Finally, Mikes arms begin forming into legs. The front legs of a donkey. His hands grow longer, out away from his wrists as they cramp up and ball into fists. They slowly get harder; number. They turn into hooves. Useless for any human-like endeavor for the rest of his short and harder lifespan he must now face.
His legs mimic his arms. Forming themselves complete into hind legs. His feet grown longer and hooves form on his toes, and grows up the length of each foot, becoming complete hind legs of a donkey.
Slowly opening his eyes, he notices his tent seems to have fallen down on top of him, as bright sunlight filters through the material. He can hear birds singing. Loudly. And sharp. Much louder and sharper than he ever heard before in his young life.
He is also aware that he has one hell of a boner.