Katy was so transfixed by her discovery, running her fingers along the dildo, that she never heard Clara come in. She simply felt a hand on her shoulder.
"Oh my god, Clara!" Katy exclaimed, "I was just cleaning and..." she stammered, looking for an excuse.
"It's okay," replied Clara, smiling, still with her hand on Katy's shoulder. Clara was a long-legged woman, thin but with firm breasts. She had extremely long red hair, which was naturally curly, and hung to her ass. Her full lips were smiling at Katy now. It was clear that Clara wasn't upset at all.
"I...oh...good," replied Katy, seeing that Clara wasnt' going to freak out on her. "I ought to be putting this away.." she said, trailing off slightly, seeming reluctant to put the dildo down.
"You don't have to...if you don't want to, honey," Clara said to her.
"I don't?" replied Katy, her heart rate increasing a bit. Every second she held the toy, her desire to use it increased. It seemed to pulse with its own energy, an energy that seemed to be working its way into her body. Her crotch had begun to tingle in anticipation, and she felt the first few beads of moisture seeping out of her crotch.
"Not at all. It's a bit tricky to use, though. Would you like me to help you?" Clara asked, moving closer, playing with the ends of Katy's hair.
Katy blushed a bit, then replied, "Yes." Clara moved quickly, peeling Katy's shirt off over her head, then unhooking her bra a moment later. Katy worked her pants off in record time, then attended to helping Clara disrobe, kissing every area of Clara's exposed flesh as she did.
"Lay on your stomach," commanded Clara. Katy rolled onto her stomach, eager for the toy, raising her ass in the air. Clara took the dildo and began toying at the lips of Katy's dripping slit, never penetrating, simply teasing.
"Mmmmmhhhmmmm,"moaned Katy, "Give it to me! Fuck me like a dog!"
Clara took the collar off the bed, quickly fastening it around Katy's neck. "Your wish is granted," Clara said, sliding the dildo inside Katy.
Almost immediately, Katy began to change. Dark brown fur began to blossom from her hindquarters and spread forward. Her hands and feet began to warp and become more pawlike. Katy's jaw began to jut foreward as her forehead began to recede. Rather than frightening Katy, it only seemed to fuel her lust, as she only got more and more eager for the fucking Clara was giving her.
Clara smiled as Katy glanced back at her, her nose black and leathery, and her canines protruding. Katy's breasts had sunken in, but two more sets had blossomed on her torso. Clara continued the fucking until Katy existed no more, simply a German Shepherd in a dark leather collar.
Clara smiled at the dog. "Now it's time for you to pay me back. I have a chore for you."