I know, you so wouldn't expect it
but I'd like to try it, even if my Karma would be like 50 sub if the meters weren't disabled. So heres the idea.
A cat girl goes bar hopping and sights up a shy, innocent cat boy, then spikes his drink with a very special drug. When he comes to he'll find himself in her home, feeling disoriented and very impresionable to her voice. He also feels very different but can't place it yet. When she returns from the kitchen, now knowing he's woken, she tries to feed him treats, revealing the fact he is wearing a collar and the pill has transformed his genitals into a womans, meaning he now has a vagina where his cock should be.
Still a little 'spaced out' on the drug, he quickly finds himself obeying every command and accepting her treats. Its only a matter of time before she gets in her leather, puts a leash on him and ravishes him with her brand new 10 inch member.
Will involve bondage, pet play, humiliation, gender confusion (calling him a girl in his highly impressionable state) and some special plans for a Sybian machine.