Sam got a strange look on his face and started absent-mindedly scratching at his chest. As Amy watched in horror, six bulges appeared under his shirt, growing out to about the same size as her own.
Sam realized what was going, but could only watch in shock as his new breasts finished growing. All of a sudden, he felt a twisting, pulling sensation in his privates, and his body smoothed and softened into a curvy feminine figure.
As his hair grew down past his shoulders, he reached a hand down into his pants, and realized that he was now female. "I-I'm a girl!" she squeaked, in a voice much higher than before.
Amy gaped at the new cat-girl. "Sam..." she whispered.