Claire and you were sold to a farm.
Meanwhile Claire was grazing, You suddenly wanted to know what her pussy smelled. You walked on your new hoofs and put your nose near her rear and took a few sniffs. You smelled something that what was left of your human mind couldn't identify, but your donkey mind picked up on the fact that Claire was in heat.
Claire felt air moving over her ass and her tail flicked up of its own accord. Suddenly she felt something warm and rough move over her pussy. She gasped, her legs straightening out, pushing her butt up in the air. She couldn't tell what it was until she looked behind her and saw your nose in her butt.
Claire wasn't sure what to think. Her donkey instincts and her human reason were still wrestling back and forth with each other. They were almost equal at the point and she was teetering on the edge. Her donkey instincts were telling her she was in heat, and needed to mate that instant. She held out for a moment before the need to mate took over completely. She leaned back into Your licking and let the pleasure take her.
They pleasured each other for a few minutes, each feeling their donkey instincts take over more and more. Eventually even their overwhelming desires for pleasure were overwhelmed by their need to mate and procreate. You let Claire get up off the floor. She got up and positioned herself with her tail raised. You didn't wait a moment but jumped on her back pushing your dick onto her pussy, thrusting back and forth forcefully. Claire opened her mouth to moan but only brays came out of her mouth, begging You to go faster and harder. You heard and understood her brays and answered with brays of your own. They brayed and brayed until they both came violently, waves of pleasure crashing over their brains, forcing out any lingering human thoughts. Though they had started as enemies, they ended as mates and lovers.
Months later:
Claire walked around the field, nibbling on any clumps of grass that seemed tasty. Her child was laying nearby dozing in the sun. You was nearby and was towards Claire with what seemed to be haste. She wondered why for a moment, then she felt the ounow familiar stirring of body chemistry that indicated heat was coming on.