Part of you is panic struck and feeling terrified at what in happening. Yet from some primal desire the growing gray fur is compelling you to lust for the ultimate finish and become a brute animal.
The thighs are growing the fur its spreading just about everywhere. Looking down its not growing over your testicles and penis. Instead those two items are changed in color to a very dark brown.
Hands and still human fingers reach down to touch and grace the changing maleness you've known as a human.
The very touch sends wild waves of sensual pleasures making mind lust for sex, and testicles long for release. The pleasure builds pressure and soon the monster dark brown shaft grows out of its leathery wrinkled home.
You can't believe it, you should be horrified but instead a thrilling lust to know how it feels in the moments of passioned sex wells up.
Longer, stiffer, soon rock hard and aching for release of that pressure building in now growing testicles. You oggle then as eye are changing. The sight is horrible yet so thrilling you couldn't stop even if you wanted to!
The drive for sexual realization as the donkey your becoming increased the pattern of change making you into a beast. Hands becoming stiff still grip the shaft stroking it up and down till spurting out the flared end comes a stream of thin light colored creme.
Rocking your hips the pleasure builds as a changing man helps the transformation process. Masturbating away what human heritage semen still remains in those changing brown balls you couldn't care less.
As the roaring flow shoots out into the air the scent of your own semen is a blessing unto your nostrils. You gulp in the air, your scent, and the desire to smell this again is printed in your brain.
Now its time to relax, the shaft whithers, the pressure is gone. The puddles of creme juices lays about drying and releasing that wonderful smell. You breathe several deep breaths as to relax those aches and pains of transformation. The fact you might have urged on even more changes brings not a care, this being a Donkey might just be lots of fun!
A stretching of stiff arms you clap your hands in joy.
CLOP !
You look, you stare, and then a smile now there is four hoofs. Four hoofs, soon four feelings of standing on all fours. Four legs, four hoofs, and with the memory of the first round of Donkey type masturbation one considers foreplay!