As you rub yourself, thick hair starts to slowly cover your body. You son't feel it right away because you're too caught up in the pleasure rubbing your enlagred member brings, but finally you DO notice that you have a beard and your chest and back are covered with hair. You stop rubbing yourself in shock, and rush to the door only to find it still locked!
The note on the back of it has changed again. It now reads that you will be allowed to leave when you finish changing. It read that you will combine the best of both human and animal features.
But you don't WANT to be some sort of half-beast - do you? The rational side of your brain says no, of course not. But now there is another, slowly growing portion of your brain that says, yes you do. And that portion is growing. It wants you to rub yourself more and release the animal potency locked in your human body.
You try to resist, but your hands keep heading towards your crotch. Your finding yourself less and less able to resist - and not really wanting to.
Finall, you give in. It just feels too good. You head back to the mirror. You start rubbing youself again, and watch as your body changes. The transformation is pleasureful and doubles the feeling you get from rubbing yourself.
As you watch you see yourself combining the best features of your former human body and that of a...