Why was that even a choice? Kelly propped her backside into the air and the bull swiftly mounted her. She fell into a dazed state, blissfully mooing loudly as she took all of the bull's huge cock. Her fingers started to clump together slowly turning into a pair of hooves, with her arms strengthening out to function as legs if she wished. The changes completed with another orgasm, but the bull wasn't done yet.
Kelly opened her eyes to see someone stood at the fence watching her. Her mooing must have attracted attention. The face looked familiar, like it was like hers, but not. 'Em...moo...ly?' she thought to herself.
Emily stood there, unable to fully process what she was seeing. A human cow that looked remarkable like her sister, was stood in front of her taking a fucking from a bull. She wouldn't of believed it, but the evidence all kind of pointed to it being her. Her car was parked nearby, this is the last general area that her 'Find my Phone' app recorded, and that was definitely Kelly's dress on the ground next to the action she was seeing in front of her. She wouldn't even of taken a second look at the cow girl in front of her, but she still had her sisters face, and not all cows have a big pair of tits attached to them. The rest of her body was unrecognisable. Emily wanted to look away, but she just couldn't. It was probably best not to find her parents and tell them she'd found her sister, but they'd just keep looking otherwise.