While Katy kept pumping the canine dildo in and out of Karen's soaking pussy, fur started to grow on the impaled woman's stomach. With every one of Karen's aroused whines it blossomed over her body and brought with it the transformation that she suddenly longed for.
Karen pushed her body as deep into the canine dildo as possible as her unbearable lust demanded her to give in to her new instincts without resistance. She obeyed and accepted the transformation of her mind and body with an arousal that spawned inside the mind of a doggy bitch in heat that she was turning into.
As her arms and legs changed shape to resemble the legs of an well-build german shepardess, her only thoughts were to cherish in her canine heat and spread the curse of the collar to enlarge the pack of transformed dogs she was just beginning to be part of.
Growling in lust Karen noticed that her spine extended to form the bushy tail of a dog. Strange bumps on her stomach grew into rows of bitch teats...
Katy did not stop pumping her mother's pussy with the dildo even as Karen's body turned fully into that of a german shepardess, lying on her back in front of the still opened fridge and whining in arousal.
The knew of the pleasures this first transformation gave her mum. The new instincts flooding her once human mind. The sweet feeling of fur that crept all over her body. The feeling of powerful new muscles, changed limbs and incredibly enhanced senses of smell and hearing. And, lastly the powerful surge of arousal that would now be her mum's main motivation in life as it was hers and her sister Sarah's now. As part of the pack the collar made them into their duty was to seek out more humans to turn into dogs. The curse had to be spread, for the collar demandet it to be!
While Karen's body was shaking with her first waves of orgasm as a doggy bitch, Sarah came down the stairs to the first floor and entered the kitchen. Not wearing the collar, she had changed shape back to her human self. She wasn't wearing any clothes and radiated a powerful aura of lust that was natural for all cursed women. Somehow the curse had altered her human form, too. Her breasts seemed tighter and her whole body movements resembled the nimble movements of a dog more then the steps of a human girl.
Katy knew that without the collar no cursed human could stay in their new and desired dog form until the cursed had physical sex with an untainted human male. Only the seed of a human male could seal the curse the collar imbuned the woman within her changed body. Only then she was able to change shape without the collar and only then she would be able to spread the curse just with her body fluids and without further need of the collar and the dildo.
Katy knew this because the collar knew this. It had put all the knowledge inside her changed mind. Nothing was of interest to the changed women anymore but the spreading of the curse and their unbearble lust.
Sarah had entered the kitchen by now and knelt beside her changed mum. She was smiling like a wolf on the hunt and her fingers were stroking Karen's newly grown fur.
Then Sarah started kissing the dog's muzzle and soon both bitches' tounges, human and dog alike, were dancing in lust.
As Sarah started to sink her nimble fingers deep inside Karen's doggy pussy, Katy grinned too and joined the fun.
Soon all three cursed women were licking and biting and fingering each other. Karen's raspy tounge started licking Katy's juices and Sarah enjoyed licking her fingers every time they left the doggy pussy of her transformed mum.
All three of them lost track of time while they pack-bonded physically and it was nearly to late until Katy noticed with a slight growl in her voice... "Someone's entering the house..."