The moment the farmhand walked you inside the barn, your new senses became instantly vigilant. Another donkey stood near a water trough, its snout plunged deep for a long drink.
The donkey, only a little smaller than yourself, looked otherwise exactly like you. But you knew it wasn't alike in one respect. It was female, a jenny. Your top lip curled back and exposed ugly, blocky teeth in a flehmen response to the jenny's scent.
Your donkey body responded almost instantly to the overpowering smell. Your dark cock slipped long and hard from your sheath in reaction to the jenny, who had lifted her head from the water trough and now looked expectantly at the arrival of you and the farmhand.
The young man slapped your rump. "I told you there was no reason to go a-courting," the hand said. "See? I've got you a nice jenny right here in the barn."
You surged forward, away from the uncomfortable slap of the young man's dirty hand, but your path brought you almost face to face with the jenny. She stretched her neck down and yawned, showing her ugly, blocky teeth. Not an attractive sight for your horrified eyes, but this close, the scent of her overtook other senses and left you in a fragile state as your donkey instincts entered into battle with your human mind.
The other human in the barn did nothing to help. "Go for it, jack," the youth said encouragingly, having noted the state of your hard donkey cock.
The jenny made a show of running from you, and to your dismay, your body followed her, clomping across mud and strewn straw on your blocky hooves. "No! Stop! I can't do this!" Your brays, hateful to your long ears, only left you more dazed and confused. You needed to be using your time to get home, not in some lustful dalliance with a mere beast.
Even with your inner protests, it was your cock and its urgent needs that dictated your actions. The jenny clopped off across the barn floor; you followed. She stopped, raised her tail; you buried your snout against her private organs, nostrils flaring, drinking in the motivating scent.
She brayed; you brayed. You both brayed in a discordant manner. You reared on hind legs and felt success as your cock found its way into the jenny for an instant of sweet success. You heard the human in the barn grunt in masculine admiration of your prowess and, no doubt, your endowment. In your obsession with the jenny, you'd forgotten the man's presence.
He was watching. He was cheering you on. It was too humiliating to bear, but the instant you sank into the jenny, you could not stop until...until...
You brayed so loudly it likely shook the rafters of the barn. It was mind-blowing in its intensity. Never had you experienced anything like it...
You knew instantly you would be forever addicted to donkey sex, which once you finally came down from your euphoric cloud was one more reason to get the hell off this farm and back home.