In his heightened state of sensuality, he imagined hanging from the underside of a donkey. His only purpose in life to be the disgusting giant black male appendage of a donkey. To be stuck, permanently hanging and swaying from a mindless farmyard animal.
Trembling, he chose the donkey penis option. A slow inanimate transformation that starts off with his human body being the correct size, with his feet already rooted in place inside giant wobbly black balls. He would be face-down, with his back towards his donkey's belly. That would be the direction he'd face most of the time. When his donkey would get horny, he would be able to see between its front legs. He would keep all 5 of his senses.
The last option, was time length. Jeff was nervous as hell as he thought about being the penis of a donkey forever. With no escape. The current excitement and heightened sensuality he was in, naturally blocked out any clarity of thought. Without thinking of what this entails, he chose to execute the program.
The moment he did, he found himself hanging upside-down! His arms hanging "above" his head with gravity naturally bringing them towards the ground. Confused, he tried "sitting up" by doing a crunch with his abs. The first thing he noticed as he did so, were the rear gray and white furry legs and hooves of....a donkey! The next thing he saw, was an odd angle of the tip of a donkey's tail. Looking further up his legs.....were HUMUNGOUS black balls that were wobbling heavily, attached directly below the puckered black ass. There was a short (but very thick and warm) black "stem" where his feet seemed to be attached inside. He could vaguely feel the balls as if they were a part of himself, as his feet "dissolved".
"Uuuhhh ooohhh..." Jeff breathed with trepidation. "I'm going to be..." He swallowed. "...a penis..."
He felt his own dick harden at the prospect. He was still horny as hell. That "stem" began to slowly but inexorably travel up his legs, trapping and squeezing them inside like a black-tailed merman. Only his "tail" ended in two giant counch-sized (from his penis-sized and location perspective), instead of a splayed-out fin. And with a giant dark purple vein snaking its way along Jeff's front side along with the black penis flesh.
His sensuality heightened to the point of needing to masturbate. Somewhere far away and overhead, he heard a donkey braying, and his entire world began to shake as the hooves down below began pawing the ground. Jeff could "feel" the giant black balls begin to tingle.
By now, his knees were disappearing into soft black flesh. The giant vein traveling along with it. Moving up his thighs and towards his pevis, Jeff felt his "legs" disappear, as he was slowly consumed by this male donkey meat. The sensations of his legs being replaced by the sensations of the trunk of a penis.
Actually becoming a penis once and for all, Jeff's mind became lost in his own horniness. Reaching "up," he began to stroke his own dick, even as began to turn black. His penis began to retract, just as he was about to reach climax. The flesh covered both of his fists, and trapped then there as his own penis became absorbed.
"No. No! Wait! I....I wasn't finished!"
But too late, his hands began to disappear, as his arms got tighter and straighter at his sides. His buttox sealed up, as the urethra stitched itself to his lower intestines.
Half-penis now and with nothing to sexually distract him, Jeff realized his monstrous fate he gave himself.
"No, no, wait! I don't want to be---" he began gurgling as his insides began to change. His entire intestinal tract extending the urethra. His stomach and eventually his throat, also contributing to its length through his inside.
Eyes wide with fear, he look back "up" at his former lower body. His abs had been consumed by now, and his chest turning into the same fleshy black tube as what was left of his upper arms sealed forever into their new home.
Suddenly, his body took on a mind of its own with the loss of his spinal column and all of his muscles below his neck. He swung forward, watching the ground beneath him zip by. The forelegs and hooves of a donkey came into view, and quickly left his view as he was now stuck staring straight ahead. His entire body stretching out, out, out! He was hardening and beginning to tingle all over.
Suddenly, it felt like an amusement park ride to Jeff as his donkey reared up on its hind legs. Suddenly, he was staring down the rump of another donkey' its tail swishing out of the way.
"Oh. Oh, no. No!" Jeff managed to hoarseness breath before his lungs and diaphragm completely shrunk out of existence. He was staring down a wide, wet, animal vagina that smells God awful. Since he was just a penis, he has no control over any of his activities. He was now an object. He was owned. And his owner shoved him straight for that nasty giant hot and wet hole.
"No, no, noooo---" Jeff was plunged headlong into the vag! His head was forced deeper and deeper into it. The walls clenching around him tighter and tighter. He had never been more terrified in his life. He began to feel claustrophobic. He would be hyperventilating and thrashing around if he could. But he was completely powerless. Besides, his body would be doing plenty of "thrashing" soon enough. It literally felt to him like being buried alive inside a coffin.
Then the thrusting started. The urethra worked itself all the way up his throat. He'd be screaming and crying if he could. But penises don't scream and cry. They only serve two functions in life. And that's it. And they are entirely subject to those two specific functions, and nothing else. Jeff was getting his first taste of many more to come of one of those two functions.
His mind going completely haywire over the body-wide sensations, he finally felt the hot liquid donkey-making batter rise through his body.
He shut his eyestightly (not that it mattered, for it was pitch dark inside), and tried to keep his down. But his muscles work in reverse now. Instead of being able to swallow, he could ONLY regurgitate.
His jaw snapped open, as the taste of seemingly gallons of hot, thick, donkey seed passed over his tongue, and spewed out of his mouth. At the same time, the female donkey came and her hot liquid forcefully splattered and coated his entire face. Up his nose, in his mouth. Everything stunk and tasted God awful. He wanted to puke, but he knew the only "puke" he had was more donkey cum. And that's exactly what happened. Several more bursts occurred, before finally beginning to settle down.
Jeff was finally extracted, and nice fresh cool air slammed into his donkey-sex-coated face. He wanted to breath a sigh of relief, as he felt exhausted. But what came next, only heightened his horror.
First, he noticed he was now nearly completely turned into a penis. He knew his neck was now converted into the black leathery donkey penis flesh. He realized all that was left of himself, was just his facial features attached to the head. His cheeks were already beginning to turn black. He was no longer breathing, and the donkey's drumlike heartbeat was emanating through the thick purple vein that used to be his chest.
He wanted to scream, as he was looking straight at the ground again. His face still covered by donkey sex juices. He wanted nothing more than to reach his arm up and wipe it off. But his arms were long gone by now. The only thing he could do, was barely move his jaw which was freezing in the permanent open position as the jaw bones began to dissolve, flare his own nostrils, and blink his eyes. He somehow got to see his "body,' which was now just a gigantic black snake, and the two humungous balls that were part of him. He wanted to scream, but could only flare up his nostrils in his own futile effort to escape from his own new body.
He felt the hot rush of liquid climb through the middle of his body, then taste the sour acrid briny donkey piss that came pouring out of the middle of his face, what used to be his mouth! He left off a tear, as his nose sunk into the flesh. Then his eyeballs and ears also disappeared. He appeared to be nothing but a donkey penis now to any outside observer. He still had the ability to see, hear, think, and feel. His "sight" would forever emanate from the tip, as would his sense of smell, taste, and hearing. His entire body comprised of the large wobbly testicles, up to his head. But he no control over it at all, save for a little bit of minor wiggling. His entire being existed for the sole purpose of being nothing but a penis. He would quickly find out that any sort of wobbling he attempts to do, will only arouse the donkey jack above.
As far as the donkey itself was concerned, he didn't notice any changes. He was mostly a mindless brute beast anyway, who happens to now possess a dick many times more intelligent. Not that it mattered, for Jeff was completely stuck. He was trapped, with no ability to do anything at all, except a small amount of minor wobbling.
This is Jeff's life now. He's just a penis. That's all he will ever be. He will feel a sense of claustrophobia, for he is permanently stuck and attached without any limbs. He cannot help but wobble himself around now and then, in his hidden mental anguish in his futile efforts to escape. But he can no more escape his new existence, than a person buried alive in a casket could ever escape from their coffin.
As for the life he left behind, he would go down as a "missing person." His disappearance will remain unsolved, and he would be presumed dead. Nobody would know he was still alive, hanging out as a donkey's penis. And even if they did, they would not know which donkey, nor where. Jeff doesn't even know his own whereabouts. All he will ever see, is the inside of darkness of his new sheath, the ground directly below him, the hooves of his donkey as his daily reminder of his much-degraded existence, and the vagina of a female donkey. Periodically, adding to his horror, he would end up in the unwiped dirty ass of a male donkey.
At the moment, he's just finishing up with his very first experience of pissing as a penis. He was still feeling the afterglow of his first mating session. The smell of both sex and piss is now permanently attached to him. Jeff was freaking out, trying his hardest to escape and ignore the God awful taste. As the past few dribbles finally came out of his mouth, he felt a "pulling back," as he was "sucked" back into a warm, soft cocoon of flesh. His sheath! He was helpless, as his head was covered up, and everything went dark.
He could still feel the movements of his donkey owner now and then, as he and his balls would sway from side to side anytime he took a step. But Jeff was mentally exhausted, and somehow, went to sleep.