Tiff felt her ears lengthening, growing longer and slowly moving up the sides of her head. They itched quite badly and she reached out and touched them with a mixture of fear and... arousal? As she felt the thin fur covered ears of a donkey poking out from her hair she let out a scared bray
"What the HeeeeeHaaaaaw!"
She clapped her hands to her mouth, and Katie tried not to laugh. She didn't want to hurt her friends feelings, but she looked pretty funny right then. Speaking of funny, Tiffs pants looked kind of funny, like the front of them was being filled with something. Katie couldn't take her eyes of the steadily growing bulge in Tiffs pants.
Tiff was breathing heavily, the room felt too hot, and her clothes didn't fit right. Her pants were way to small in the crotch for a girl with such a large co...cock?! Tiff stuck her hands into her pants and felt a pleasant rush as she slid her hand down the shaft of her newly forming cock. It was hot and rigid, but somewhat velvety, and she felt a ring like bulge halfway up the shaft. Did that mean.... She surprised Katie by pulling her pants down and revealing what they had both suspected. She was turning into a jackass, and that meant she had a donkey's cock. It was blunt tipped, dark blackish brown, and had a thick ring halfway down the shaft. It must be ten inches long by now, and it didn't look like it was done growing, and neither did the heavy balls she felt slap against her thigh...