Jeff was suddenly yanked upward as his back fused to the cow's underside, his skin melting to become one with the cow's. He could feel veins and other tubes snaking their way into his body, which felt like a thousand worms squirming around his spine. It was the oddest sensation ever.
He also found that the cow appeared to grow in size, and he realized he was actually shrinking ever so slowly.
With a few jerks, his cow "host" got up off the ground where it had been laying. Jeff raised up with the cow as if he weighed almost nothing. Attatched to the cow's underside, he swung slightly from side to side as the cow wandered about the pasture.
As the minutes began to pass, Jeff realized that being an udder was pretty boring. The first thing he noticed was that his arms and legs had shrunk and were now too short to reach the ground.
He felt an odd tingling sensation in his chest and gut, and realized his organs were dissolving and becoming...liquid? He tried to say something, but it came out as a muffled gurgle.
Panic set in as he realized he could no longer breathe.
<Oh shit!> he thought. <I'm gonna drown in milk!> He flailed his shriveled limbs about weakly, but to no effect.
His vision turned hazy, then he stopped flailing all together as he passed out.
...
Some hours later he awoke to find that he was still alive. He was no longer breathing. A voice at the back of his mind said, "You're just a body part. You get your nutrition from the host."
Jeff considered his surroundings, and found that his changes had progressed considerably. His torso and hips had fused into one bloated mass, and had taken on a pinkish color. His arms legs, and penis had relocated somewhat and were now reformed into 5 teats on the underside of his body.
<Five teats?> he thought. Then he realized his head was slowly shrinking, reforming, with his mouth drooping down and stretching out to become the sixth teat. His nose had already disappeared, and his eyes (unbeknownst to him) faded from view to the outside world. His vision was located in between the two forward teats, though he found he could swivle his view to a limited degree. Though he no longer possessed a nose, he could somehow still smell the rich, rank odor of his host. Though he had no mouth, it felt as though his entire being (including what used to be his taste buds) was filled with warm milk.
Pulsing with his new mistress' blood, slowly filling up with her milk, Jeff realized he had become her udder almost completely. As his owner lumbered about the fields he jiggle and swayed with her every movement. It would've been pretty annoying if in didn't feel so damn...good. Pleasurable, even.
He found it had to concentrate whenever his mistress moved about. Suddenly his owner laid down. and his world went dark as he was pressed beneath her massive bulk. Again, due to his heightened sensitivity, the pressure of his mistress' bulk only caused him greater pleasure. He wondered what was in store for him in the coming month.