It was as normal as any as any other day, birds chirping early in the morning, cars pulling through the drive-thru for morning breakfast or coffee. And our main character, the average girl next door Katy, was trying to sleeping in on this normal day.
"KAAAATTTTTTYYY!!!!" yelled her mom from down stairs. Which in turn got Ruby exited, the family dog, a Malamute and German shepherd mix, and proceeded to bark, adding to the ruckus that woke up Katy. The attempt to sleep in was denied.

With a big stretch, Katy yawned as she stretched out her torso with her arms above her head. She sat up and groggily got out of bed, her tight linen short shorts hugging her heart shaped ass, and her cute night shirt firmly displaying her trim and pert figure. The morning chill still lingered, and her nips were stiffly rubbing against her shirt. Katy opened the door to her 5-year old dog, which shook her tail so hard her entire body wiggled, panting with her huge doggie grin. Katy knelt down to pet her, talking to her in the way everyone does to a dog.
"Hey girl, how are you huh, how are you?"
Ruby just kept acting like a giant cat and pushed her body into Katy's nurturing hand.
"Come on, let's go eat breakfast," Katy said in an excited voice.
The two ran down the stairs into the kitchen, Katy pulled out a box of cereal, and Ruby went to her bowl full of food. After Katy was done, Katy got ready for school, and headed out the front door, saying her goodbyes to her family and walked towards her car to enjoy another day of being a Senior.

Katy was needless to say popular, being in Leadership class and smokin' hot with her C-cup chest, luscious brown locks down just past her shoulders, long sexy legs accentuated by her short denim skirt that went to just mid-thigh, she was the dream in most of the guys dreams, especially Freshman. Katy was a good student, an A here and there, mostly B's with a C or two, basically close to perfect.

"Hey Katy, how was math?" asked Juliet, her friend since middle school, as she sat down at their usual lunch table, along with most of the other populars who have this lunch.
"Boring and non-productive, just some review over Pre-Calculus, how was chemistry."
"Same, so what are you going to do over the weekend, since your folks are going to be gone?"
"Lay back, play some video games, maybe take Ruby to the park, rent a movie, just enjoy the time I have to myself."

"Sounds great."

A few hours later, and Katy got home to be nearly trampled by Ruby, and say goodbye to her mom and dad as they left for a business trip. Katy wasted no time and hopped onto the internet for some porn. Though not for the traditional stuff, more like lesbian pics or vids and sex stories (how could you not see this coming?). And after a long day around some beautiful girls, Katy needed some relief. She found a video where a girl hires a personal trainer, but can't stop hitting on her, and eventually talks the supposedly straight trainer into going upstairs for some "yoga". She gets to the "yoga" part and slides her hand under her skirt and panties, and begins to massage her labia, then works a finger into her pussy, followed by another a minute later. Her moans start to match the moans from the computer as she writhes around on the office chair, trying to ignore the barking outside from Ruby. She eventually brings herself to relief, on brink of screaming in orgasm.
Katy Bring Ruby back in, who is curious about the familiar smell when mom and dad are gone and Katy moans as if in pain while she sits on the chair daddy spends most of his time at. And after trying to probe Katy's crotch where the smell is strongest, she pads over to the chair she has chewed on countless times, since it seems to grab attention away from her.

Katy pushes Ruby away and goes upstairs to wash off her sweat of the day, and her recent escapade. A few moments later, and Katy is toweling off her wet and nude body, glistening on her tanned body. She just finishes changing when she hears the doorbell go off, after she quiets Ruby, she opens the door to find no one there, only an unmarked package that says, "To Katherine."
Katy picks up the small box and takes it into the kitchen. She opens it up and finds inside two bottles. The first on she pulled out was transparent, with a purple liquid inside simply marked "Transformation", the other one was also transparent, but contained a blue liquid, and was labeled, "Reversal". The two bottles were about the size of a shampoo bottle, the only other thing inside the box of paper, but Katy was more interested in the liquids.
Ruby got bored from investigating the scent, and went looking for Katy, who was now interested in something in her hands. Ruby a bit upset something else was taking attention away from her. So she padded into the kitchen and brought her water dish over to Katy. Katy her the bowl drop and looked down at her dog, "You thirsty girl?" she asked. Ruby just wagged her tailed and stared at her. Katy bent down and picked up the bowl and carried it over to the sink. As she filled it up, she saw that she hadn't put the purple bottle down, and that's when she decided to give it a test run, and put a drop into the water dish.

She set the dish in front of Ruby and stood back, waiting to see what would happen. Ruby wagged her tail at how Katy gave her water, and then started to lap up her water. Though it tasted funny, she continued to drink, until she felt an odd tingly feeling course throughout her canine form. She then started to get hotter, causing her to pant profusely, and that's when she her whole body began to grow in size, Her hind legs grew longer than her front ones, which not only rounded out into feminine arms, but her front toes elongated into finger, her chest broadened into shoulders her neck slimmed and her face became more humanoid, her muzzle shortening a bit and she even grew a full head of dark hair that would've hung past her shoulders if she wasn't still on all fours.
Katy watched with her jaw on the floor as her dog turned into a sexy anthro canine, and got turned on as she witnessed two lumps begin to form on Ruby's chest.
Ruby continued to pant, only in a lusty tone, now that she was part human, as her new forming breasts pulsed with new feeling and sensitivity. Capped with a regular sized set of nipples, her boobs grew to a DD-cup, still covered with enough fur to hide her nipples if they weren't so stiff, but the fun wasn't over, because her two other rows of teats moved up her torso just beneath her first pair and grew in size, the second one D's, and the third C's.

Ruby finally started to calm down once she was done changing, and looked over at Katy. Katy stared back in shock and awe, "Are you okay Ruby?" she asked. Ruby smiled and replied, "Never better, hey I can talk, wow, what was in that water?"

Katy nearly blacked out from the all the shock of the transformation and the half dog on all fours talking to her. Ruby then stood up, trying to find her center of balance and try to get used to walking on two legs. She walked over and started to lick all over Katy's face, "Are you okay Katy? You seem scared."

Katy scrunched her face in annoyance at the tongue lashing she was getting, but also chuckled at how this huge dog tongue was tickling and slobbery just like every other time Ruby gave her kisses as a regular dog. It was then that Katy realized that here she had someone who has always loved her, currently is the sexiest thing she's ever seen, and that she should experiment.
Katy then surprised Ruby and kissed her back, but not those quick pecks she usually gives, this was a long pucker, and Ruby liked it. The two immediately knew where this was going and ran upstairs. Ruby jumped onto Katy's bed, who shortly followed and dove her tongue into Ruby's mouth. The two started a long make out session followed by some groping, Ruby of course moaning harder as Katy massaged her new boobs. "This feels great!" exclaimed Ruby.
"If you think that feel good, try this." Katy then lowered herself down Ruby's body, kissing and licking each breast as she went. When she got to Ruby's crotch, she gave Ruby's clit a kiss, which elicited a squeal from Ruby, followed by aw hard buck so as to push Katy harder onto her clit. Katy then slowly teased the edges of Ruby's pussy, more moans and howls ensued, along with a few begs for release. Katy finally drove her tongue in as far as it would go, and wriggled it around for a good minute, sending lightning straight to Ruby's brain. Ruby was so close to orgasm, and Katy could tell, so she reached up with her right hand and rubbed Ruby's labia in between her fingers. Ruby screamed/howled in orgasm, slight convulsions jerking her whole body as her body was thrashed by waves of euphoria.

Ruby finally came down from her orgasm, and simply smiled and closed her eyes. Katy crawled back up, and cuddled with her pet and lover. Though she wasn't even close to satisfied, she was happy to both make Ruby happy, but also to have her first lesbian experience with her. Ruby looked up into Katy's eyes and smiled a big smile. "Now it's your turn," said Ruby in a seductive whisper. Katy smiled, and watched Ruby get into position, and then helped her under her pants. Ruby yanked off the pants, then reached back up and slid off Kat's panties. She then started just like Katy did and put her mouth against Katy's clit, but instead nibbled it a bit with her front teeth. Katy bucked in pleasure, loving the feeling of Ruby's small teeth rub her the right way. Ruby stopped eventually and then gave Katy one giant and slow lick with her tongue. Katy nearly screamed at the slightly rough muscle dragging across her opening. Ruby kept this up for awhile before plunging her tongue deeper than anything Katy's ever had inside her. Ruby's tongue went in and out, tickling and stroking every nook and cranny. Katy of course came within seconds and soon had the same face Ruby had a few minutes ago. The two snuggled in their afterglow and drifted off into LaLa Land (more like Lesbian Land) and both thought about what tomorrow would bring.