Enjoying the spark of pleasure Rebecca moved her legs further apart and started to rub her changed sex with her hand.
"God this feels amazing" Rebecca thought.
She started to rub her sex faster and more frantically while moving her other hand up to squeeze her breasts.
Pleasure started to take over and Rebecca found herself starting to bend her legs. Suddenly with another jolt of pleasure she fell down to knees.
Images of donkey cocks started to float into her mind and of male donkeys getting up onto her back and taking her from behind.
"Oh fuck this feels so good" she moaned as she started to insert her fingers inside of her sex.
Rebecca allowed herself to fall forward onto her hands and pushed her ass up into the air. She started to support herself with one hand while continuing to pleasure herself with the other.
"Here i cum" she moaned her voice getting higher.
"HEEHAWWWWWWWW" she brayed as an orgasm shook her body. Her ears quickly became pointed and shot up through her hair and a small nub started to grow above her ass and pushed out into a short half donkey tail complete with a tassle.
Rebecca let the aftershocks of the orgasm course through her body. She stood up completely drenched in sweat.
"That was amazing" she gasped breathless, "why do i feel weird".
Rebecca reached up to the top of her head and grabbed hold of her now long donkey ears pulling them down.
"Fuck" she moaned.
She reached down to her ass and felt her half grown tail in her hands.
"Shit i've got a tail too! I have to control myself.. i can't let myself become an animal!"
Composing herself Rebecca looked around the warehouse to see where to head next.
To the front of her was a passageway opening into a larger room while to her right was a small cloakroom/changing room.