You don't know what to do. Is this normal? Should you go back and try to find the book? Who ever heard of someone getting wolf legs in a library?
The wolf fur has now gone entirely up your legs and you can't roll your pants up anymore. You feel a tingle in your manhood while your undoing your belt, and you pull your pants all the way off just in time to witness an unsettling sight. Your balls are furry, and your dick is being swallowed up inside a white fuzzy pouch on the outside of your groin. You grab onto the soft fur in desperation, frantically hoping your dick is still okay in there. You calm down a little bit as stroking the soft fur there feels good and you can feel a bony hardness starting to congeal inside the pouch. At first you think it's your human erection but then you remember the book said wolves have a penis bone. You do manage to coax a point pink tip out of hiding. Your eyes widen and you take your hands off.
You're about to shout for help when you're distracted by a tingling in your spine. There's an uncomfortable bony hardness against the back of the toilet that makes you lean forward and look back. There's a rod-like growth several inches long sticking out behind you, and long dark hairs are already starting to sprout from it. The mere impulse to get it up off the toilet makes it lift up and stand stiff. You succeed in pointing it several other directions as it gets longer and hairier. Soon you have a long bushy tail just like the wolf in the book. It thwacks against the cool ceramic when you try to move it. And the tingling feeling in your rising up your waist makes you feel like this transformation isn't over.