"Be careful dude, you might change yourself into who knows what." Jeff cautioned his friend. He was too busy staring at his new cock and balls to really see what Mike was doing.
"Ya. What does it mean if I, agh!" Mike doubled over as his body started to change. He hadn't meant to change anything, but had accidentally clicked on one of the options.
Mike pulled his shirt over his head and saw fur creeping up his stomach and chest. As the brown fur spread, he felt his spine tingling. The tingling extended from the base of his neck down to his tail bone. But it felt like it went on longer than it should. His hands reached back and found a tail growing from his back.
"Mike, what did you do?" Jeff finally looked at his brother and saw that Mike was clearly transforming into... something.
Feel free to add your own options.