As soon as Claire had uttered those words Rebecca felt a popping and cracking in her hips.
Rebecca started to fall forward grasping onto the gate for support.
"Oh god i'm going to all fours" Rebecca moaned.
She looked up to see Claire watching her intently. Suddenly Claire started to bray uncontrollably and raised up on her hind legs. Rebecca could see Claires large balls swinging from side to side and her still human breasts bouncing up and down.
Rebeccas eyes quickly darted to her cock slowly pushing out of her sheath as she enjoyed Rebeccas changes.
Claire rested back on her forelegs with her cock fully extended from her sheath.
"Oh my god your enjoying watching me change" Rebecca shouted at her. "You sick bitch, i can't believe your HAWWWW"
Rebecca quickly covered her mouth with her hands astounded at the noise she had made.
With no support from the fence Rebecca lost her balance and fell forward onto the ground leaving her supporting herself with her hands and now hind legs.
"Oh fuck I'm a quadruped now" Rebecca cried to herself. "It won't be long till i've a tail and a *gulp* donkey cock".