"Sarah...Sarah..." you wanted so badly to try to answer...but the pain above your ass was really starting to get bad......You tried to spread your legs to get some comfort, but nothing....the pain was getting stronger....
"Hey, are you okay?" Sarah asked, realizing that something was happening....
"Here I am....I think.....ahhhHEEW" you tried to answer, but the words were soon replaced by a bray.....
You couldn't take it anymore, the pain was enormous....you had a very strong urge to bend over, you did....but as you did, the weight of your body made you go on all fours....your hands in front, in the damp ground, your feet - oh god your feet - those that were almost formed hooves behind.....At that moment you looked at Sarah and saw how her eyes were wide and scared....Sarah's eyes saw, in fact, what you felt: the formation of a large bulge in your jeans above your butt....it grew and grew.....and you, in the meantime, had stopped suffering....the initial pain had been replaced by a sensation of pleasure, while your tail began to form....a sensation of pleasure so much so that even your cock had really started to harden, really showing how big a donkey cock could be.....After a few moments, the jeans gave way: a loud riiiiiiipppppp could be heard. And from the slit soon a long tail began to emerge, becoming, as it grew, hairy, with gray hairs. It grew and grew, making you look more and more like a donkey, as had happened previously to Martha.
Sarah was left speechless, horrified by what she had seen and which, immediately, she had imagined had also happened to her friends while she had gone to get help.
But..but....the horrified look at the beginning, as time went by, was changing into a curious look.....curious for your cock, very hard, and now completely donkey-like, no longer human.....