"...ahh yes, a donkey's would be really good." Ben said with a smirk as he clicked onto that option. He thought well of what he's seen donkeys pack between their legs. "Might as well go big." And with that, Ben clicked a few more times, no timer, simply let it happen, and gave a final click to start it.
Ben then sat back and let the shivers of it start to spread to him. Already he could see his silk underwear strain with a bulge as usual when he got horny, but it wouldn't stop growing. With a deep breath, he pulled down those undies and gave a small gasp at the sight of it. It had grown, quite a bit longer and slightly thicker, already. It flopped out above the strap of the undies, not even fully hard yet but bigger than what he's ever gotten to. What was also a bit to take in was the color of it, as it had darkened a bit. Ben then also remembered that usually a donkeys dick and balls would be dark colored. His thoughts ran wild. His dick was becoming animal like, and the slight push and pinch between his thighs told him his balls were following with him. He couldn't hold off anymore.
Ben breathed in and out slowly, and took his two hands to feel himself up, shivering well at its sensitivity and the fact he now could wrap both his hands around the length as it started to stand up erect. It was now long enough that the tip was a bit above his belly button. "God yes." he softly murmured and started to stroke along it, eyes closing slowly as he let the passion get to him. Picking up the pace a bit as he felt his balls jiggle around full with seed as he got hot to himself. He huffed a bit of hot air from his nostrils as his body felt tingly and warm, slightly sweating all over. He was a bit too lost in pleasure to give much notice as he made long strokes up and down his new beastly length. It was when he gave a slightly strange moan and felt his ears wiggle a bit that he thought things might be becoming a bit too strange.
Slowly opening his eyes, first in his view was his long dark donkey cock, tip now flaring more in shape of the beast, sliding around around his hand - a hand that was on an arm covering with dark brown fur...
Startled, he looked down to his legs, also covered in the fur, his hips and thighs even looking slightly thicker. "Wait...what's the program doing to me?" he thought and tried to stand, finding it strangely hard to keep on his toes. Looking down showed him why that was. Each foot had most of his toes looking smaller, with his middle toes bigger, the nail on each though dark and thick looking. He watched on for a moment as his toes practically shrank back into his foot as his big middle toes took over with a solid..."hoof!?!"
He had to stumble a bit to step over to his mirror. The sight of him in this moment made him gasp, which strained with a strange beastly groan. Looking back at Ben, was a Ben very hairy, very different and wild looking. Covered in dark brown fur, with growing ears that pointed upward and slightly funneled like he's seen on some equines. His nose and mouth had a gray hue to them and looked slightly large and rubbery, almost looking pouty, no doubt naturally in dismay of what Ben was thinking as his saw his unnatural self, but also noting a slight growth outward. He was gaining a snout! He flexed his large dark lips a bit to adjust to the strange feeling of his nose and mouth growing outward and noted his teeth looked quite big and flat.
Now he felt a sensation that made his spine shiver, quite literally, as he felt some stretching above his rear. He groaned in an ever increasing bray as he turned his backside to the mirror, and saw a small nub of a tail growing longer, a small tuft of black hair on the tip like a little brush. He looked to his ass, truly an ass of an ass, with thick cheeks, and a pronounced dark donut like hole. He snorted as looking at it just turned him on, and made him wish someone might be here to share this with, or if he could have this happen while he was at a barn...
Those thoughts of going a bit buck wild made his cock rush with even more energy as it perked up, now easily several times it's usual length, somewhat girthier, flared and needing release. Ben thanked in his thoughts that somehow his hands remained mostly unchanged, with all his fingers intact, just covered in fur and with nails quite thick and hoof like. No matter, he took those hands and fondled himself, left hand squeezing at his large dark nutsack, and the right hand stroking his great donkey cock. He jerked himself off wildly, as he looked at his strange self. It was too weirdly sexy to be a half donkey man but Ben was really getting into it. It didn't take long for Ben to suddenly bray his deep lungs out as he came. It was probably several pints worth of cum came rushing out of his cock, splurting back onto him. The musky fluid hit his chest, shoulders, even getting up to his chin with a bit on his thick lips.
With heavy braying breaths that slowly calmed back down, ears and tail wiggling idly, Donkey man Ben calmed down a bit and surveyed the messy goo slowly sliding down his hairy chest and belly, dribbling down his dicks length. He awkwardly bent down to retrieve his underwear that was discarded and used it to sop up the seed. Soon the poor undergarments were soaked in it.
After a little practice walking on hooves, Ben went to the kitchen to grab some water and snacks. Getting back to his laptop with a couple of apples, chomping on them easily with his big teeth. Ben sits his bare ass down, adjusting his tail. He looked at the screen, noting the error message that brought on his current state. Seems that whatever option he'd pick would result in some beast or at least changed form for him. He almost wanted to experiment with them all, or experiment with being a donkey more and more, or hell, maybe a couple of his fellow gay buddies would get a kick out of trying this thing out with him...