Melissa could now smell Erika's changes. Fur started to burst out of the pours of her body, blond hair became fur as it raced from her armpits and vagina to cover her entire body, a 2 foot tail ripped through the back of her swimsuit. She started to run her nails, now claws, over her body ripping off her tattered clothing exposing her trim swimmer's body and pert breasts but now all covered with fur. Her ears grew and flopped over as her hair shortened to a peach like fuzz.
She looked at Melissa part girl part dog and her penis throbbed painfully. Her mind was filled with the idea of fucking Melissa. Not teen experimentation but impregnation. Melissa was in awe of the what Erika was becoming. She decided that Erika needed to complete her transformation. She ran out of the hall and Erika chased her running on all fours.
Grabbing Melissa by the foot she started to tickle and scratch at her lover's foot. Melissa let out a series of giggles that sounded like excited barks. Her breasts wobbled with her body, Erika snaked up the length of Melissa's body sticking her long tongue into Melissa's moist and hairy clit. Melissa howled with pleasure. Erika fondled Melissa's breasts but she still sure this isn't what dogs did. The longer she was in this form the more canine and feral she became.
She flipped Melissa onto her back and slipped her dick into Melissa's cunt. An electric current older than humanity ran through both 'girls' as if she could power the world Erika's mind was filled with a world of Canine/Humans who would become the new human, Homo Canine. She was the Adam and her bitch wasn't Melissa but the new Eve.
Erika's human mind was simplified into bitch and male, no friend or lover, pure animal instincts that only gave a fuck for procreation. S/he hammered Melissa as the changes over took both of them in rapid time. Bones crunched as both were turned from teen girls with a dash of dog into full dogs. Melissa became a Irish Setter bitch with hair the same shade as her auburn hair and Erika a male Golden Retriever with fur as golden as her blonde hair.
Erika the dog erupted deep inside Melissa's womb. No pills, no condoms, just pure fucking. As Erika howled with pure animal pleasure as she pumped her seed into a waiting womb...