Like a wave of change rolling over David, he has consented to the final outcome, and then there is nothing in the universe that can stop the inevitable!
A wagging tail is but his first worst sensation, but as the wave of change unrolls and envelopes what was human, making it equine and donkey; the horror of it all vanishes with his first very male donkey size erection.
Eyes roll backwards in their larger sockets, nostrils expand as does the ability to drink in various new scents, especially those of coming jenny types.
Long ears thick lips, and huge mouth and one tongue ready to give a loving lick!
David can do nothing but stand there and honestly know his humanity is soon to be a thing of the past. He watches in silence, seeing is believing, as his own witness to the dehumanization and transformation, he stands bolstering his donkey size erection and brays the pangs of lust only a farm stud wants and longs for obtaining.
Now he is as an animal, and little else gives him any more pleasure than to sink his mushroom tipped shaft into the blackened lips of some lusting and needy jenny donkey types.
Eyes bugged, erection bouncing off his fur covered rotundas donkey belly, it rises and falls swinging and swaying, driving poor David ever closer to the leap into the abyss of bestial actions.
Nothing matters, he realizes his present self is but the male animal of a lowly class of equine types, and of all this his loins govern his mind, body and future.