As they looked at the three doors, Sam shrugged an opened the one marked with a Cat's paw, as the door creaked open and he stepped forward, he didn't notice the collar hanging above him. As he moved forwards, the collar dropped down and wrapped around his neck, clasping as it did. Sam pulled at the collar, but it refused to come off, "Uh oh" said Sam, "I think I may have set off a trap Tom" Tom looked at him "Let me help you get that off" he said, but between the two of them, they could not remove the collar, and, as Tom touched it, it began to glow, "this can't be good" said Sam. The glow spread across his body and dissolved his clothes, he felt amazing, then suddenly his hair began to grow, it became longer and longer, and change from curly brown to straight and black. As his hair changed so did his body, his hips began to widen, causing him to moan in pleasure, then his chest began to expand, until he had large breasts. As his hips continued to expand, his shoulders started to narrow, and his head took on a feminine cast. As his head changed, his facial hair receded, his pupils became cat-like slits, and his tongue became rough like a cats, his voice began to become higher and higher, until his moans were those of a woman. As this was happening his legs narrowed and lost their hair. All of these changes caused Sam immense pleasure, and he began to masturbate furiously, running his hand up and down his shaft while the other hand cupped is balls, until he began to spray cum everywhere, as he did so, he felt another change, his dick shrank and shrank until it was nothing, and then his balls pulled inside him, harder and harder, until he was a she, a vagina where her balls had been. Sam looked up confused, she could feel more changes coming, what could they be? Her question was soon answered, as his body began to shrink until she was about 4 foot 4, then her breasts shrank down until her chest was nearly completely flat and her ass shrank down to a small size, she now looked like a ten year old girl, however her changes weren't done yet, soon a a black cat tail sprang from her back, and her ears moved up the side of her head and shifted until there were cat like. However if there was any thoughts as to whether this was truly a little girl in the mind, they were proven wrong when she reached down to her vagina and began rubbing it as hard as she could, purring at the pleasure it gave her, her fingers soon found there way inside and she began to leak girl cum. when she finally stopped and looked up, she saw Tom staring at her in disbelief and shock, she looked back, and...