Once the three creatures have your body sufficiently coated, they go to work pulling at the coating, prodding at it, rounding it out at some spots and thinning it at others. The black and white from the cat and rabbit seems to swirl together, forming splotches all across your body, while the pig lifts your shirt and goes to work down below, massaging your gut and working at something you can't see past her head and the constantly moving bodies of the other. The rabbit holds your head still while the cat squeezes at your cheeks, causing the rubber to form a mound over your face and moving more and more of the stuff up front, pulling it into a fairly long muzzle with a rather broad nose. Once she's done with that she moves on to your ears, tugging the rubber over them into a longer shape, letting the lengthy ears stand on the sides of your head.
Finished with your face, they move on to other parts of you, the cat squeezing your fingers together in pairs, forcing them into hard, hardly flexible rubbery "hooves" of a sort, then doing the same to your thumb and leaving you with only three digits per hand. The rabbit moves behind you instead, pinching a bit of the rubber near the base of your spine and then stretching it out into a long white tail, squeezing some black rubber into a clump at the tip. With that done the two of them move on to slide up your pantlegs and slip off your shoes so they can get to work on your feet, giving you a clear view of the pig's handiwork.
Pressing her pink rubber onto your gut, she's been gradually building up a large, jiggling mass of the stuff. Already it's big enough to reach well down your thighs, four long protrusions hanging limply from its surface. You recognize it almost instantly as a cow's udder, and combined with the white and black pattern covering the rest of you it doesn't take long for you to realize what's happening. For a moment a new flash of panic shoots through you - bulls don't have udders! - but within seconds you're able to go back to focusing on that massive udder as the cat, having finished helping the rabbit fashion a pair of massive and solid black hooves on your feet, reaches right down your pants, gripping your entire package, her rubbery "sweat" leaking into the front of your pants. She eventually pulls her hand back out, and while you can't see your pants past the udder you can tell from their added tightness that whatever she's done to your junk at the front has caused them more than a little bit of strain.
Apparently satisfied with their work, the three girls step back to admire the fruits of their labors, looking over your new "cowboy" self approvingly. You find it hard to return that feeling, the only saving grace of this whole ordeal being the fact that they were kind enough to leave your cloths on (though your udder lifts the front of your shirt more than enough to make even that do little more than make the whole look seem even more awkward and out of place).