Carrie began to panic. She fought to control her breath as the full moon slowly emerged from the eastern horizon. Folding up the last of her clothing next to her shoes, in her little space amongst the bushes, she saw - and felt - her transformation kick into full flow, as her body sprouted a rippling wave of reddish-brown hairs that joined up to form a thick, warm pelt of wolf fur.
She curled into a fetal position, careful not to cut herself with her new claws.
Must...keep...control! I will be...both wolf...and human!
Carrie moaned, but kept her mouth shut - not wanting to cry out, as the pain of the metamorphosis peaked into a crescendo of agony that was thankfully short-lived. In that half-minute or so, as the moonlight shone upon its new devotee, Carrie's hands and feet had altered into paws - and her legs became furred, assuming a digitigrade form. Her tail bones erupted from her torso, surrounded by hair-tipped flesh - and then grew longer and bushier.
Carrie's breasts flattened themselves against her now-muscular chest, leaving only small nipples. Two more teats emerged from the fur below her stomach. At the same time, her head changed shape - the ears shifting towards the top of her skull, and becoming pointed and flexible in the process, as her hearing became more acute. Her hair retreated into her scalp, then changed into cranial fur. Carrie stifled a 'yowl', whilst her jaw and nose grew outwards to provide her with a muzzle - and her aching gums bore witness to her new fangs...
The throbbing left by the completed transformation slowly faded away. Carrie now allowed her tongue to hang out, as she panted. Her lean body recovered itself, and she sat upright upon her haunches, before feeling her furred legs, tail and muzzle - even her whiskers - in growing excitement and relish. Still, she fought against the primal desire to howl her gratitude to the moon. Carrie didn't want to alarm John - she could hear his racing heartbeat clearly enough, as it was.
"Carrie!?" John's voice made her sharper ears twitch. "I've finished counting! What's this surprise, then?"
She took a moment to allow her lupine and human personas to merge and become one. The world was grey to her now, apart from the light colour of her husband's body heat, as he advanced into the bushes. Carrie smelt his anxiety, his fear that something bad had happened to her...
Damn! How to take away that fear? Carrie growled to herself, as her mind raced. I know...
John was swallowed up by the dark of the surrounding bushes. Only the moon provided any light for him now.
"Have you got a dog here, Carrie? Is that my surprise? Oh... Hey! Your nose is cold! Gosh - you're a friendly chappie...! Sorry - chappess! Hey, now - stop licking my face! And your breath's too hot! Here... Have a mint. Good dog! Now - can you tell me where my wife is?"
Carrie crunched on the mint, and swallowed it down. In the meantime, John had retrieved a half-forgotten mini torch from his jacket pocket and switched it on. He gasped as the beam illuminated the wolf woman now wrapping her furry arms around him.
"Sur...prise, John!" Carrie managed to growl. Her dark lips pulled back into a lupine smile.