As the distance between you two shortens, an alien thought entered your mind, neither human, nor donkey.
Not even five feet separate the two of you, when you turn around and present yourself. Without delay, you feel the weight of the stud press you down.
It takes a while, but he finally aligns his now throbing member to your hole. He pokes at it at first, finding the perfect angle to enter.
Then, you grasp the situation. you're a former human, now donkey, about to do anal with another stud! You start to squirm away, but the weight of the male keeps you in your place. You bray in detest, but it's no use. you're in to deep, as you know he soon will be as well.
And then it happens...
With one single thrust, he enters your, until now, most forrbiden of orafices. It was all that was needed to complete the transformation. You were now completely donkey, now a member of the equidae family, now... a stud amung STUDS. All thoughts and feelings regarding the disapproval of the actions at hand were replaced with the lust and wanting for More! And that's exactly what you received. Thrust after thrust, you were pushed to a state of extacy not even your former human self knew.
"HeeHAWWW!" you screamed in absolute pleasure.
This excited the male atop of you, and he proceeded to pound you harder, to the point where you're forced on your front knees. Your hard cock pokes the dewey grass beneath you, causing you to shudder, one blade gentley grazing your tip's slit.
You can feel it, the presure. Building... Waiting... for the right moment. His thrusts get even harder, as you sense his release nearing. Then, in a kind of a final requiem, all memories of your human life flashed before your eyes. Emotions, meetings, family, past lovers, all made a final appearence before you lose yourself to your new form.
Finally, for what feels like ages, it comes.
Or... HE comes, as a volcano of the stud's hot seed is pumped into your ass. Your release follows, as torrents of cum hits the ground. Seconds tick by, and the two studs keep pouring out. The male drives his flared cock DEEP into your ass andgive you everything he's got. So much, in fact, that some dribbles out your hole. The orgasm you are expiriencing is far greater than all others in your pitiful human life... combined. He shoves his shaft even deeper, and your rim egdes the start of his base. It's as far as it can go, and you wouldn't have it any other way.
Then, it's over. Several minutes of pure pleasure, over in seconds. The male pulls his now softening member out of you. As well. your cock softens and retracts back into it's sheath.
And that was that. You're a donkey, and there was no way for you to face, let alone fight, that fact. With one final bray, the two of you bend your heads and begin grazing.