(F to Dog)

To say Henry Jacobson was sometimes bullied would be akin to saying the lost city of Atlantis was sometimes a bit damp. The young man couldn’t help it: with a weak voice, a natural desire to be kind, and a lack of friends due to a recent move, he was a perfect target for the local jocks and jerks alike.

Unfortunately, one of said jerks happened to be his step-sister Irene. She also was part of the reason for his recent move, but he didn’t hold that against her. Her mom was gorgeous, and his dad had a weakness for redheads, after all.

If only Irene had inherited more than just hair color from her mother—Henry’s stepmom was probably the nicest person he knew. He thought of this on his way up to his room, privately hoping that Irene would be too busy with homework or torturing a squirrel or whatever she did in her free time.

“… and that’s when I really showed her, right?” Irene’s voice trailed down the hall, which wasn’t too far from the norm given her natural volume. However, her talking to someone in her room certainly was.

Against his better judgment, the young man turned towards her room, curious. Henry peeked past the doorway, finding her cross-legged on her bad, yakking away into some kind of phone he’d never seen before. It wasn’t one of trendier modern ones, which made it doubly odd for Irene to be holding it.

“-right, not like you can answer,” Irene laughed. She looked to be either livechatting or filming something, and in either case that wasn’t something either of their parents would approve of.

“Hey, sis,” Henry called out, knowing she hated being called ‘sis’, but taking his small joys where he could find them, “you remember what our parents said about posting stuff online, right? Last time you kind of got in trouble for that prank.”

“Blow me,” Irene predictably replied. She upturned her nose with a small frown on her face, looking down to her phone for a moment. It almost looked like she was considering doing something with it, like featuring him on whatever channel she posted to. The redhead shook her head a second later quietly, setting the phone down beside her. “And mind your business. You’ll live longer.”

“Cool threat, sis.” Henry sighed. Even though he knew he’d be bullied for it mercilessly at school, at least he could get some snark in at home. “But if you do anything to me, there’s a good chance that someone’s going to search your room and find that toy of yours.”

For once, Irene seemed to be wrong-footed. Panic flitted across her face, and she tucked the phone under her pillow. “Hold up, I found this thing fair and square. Someone left it on the sidewalk by school, and you know. Finders keepers, right?”

“Not sure our legal system agrees with that, but I think I might end up telling Mom and Dad about that anyways,” Henry replied. He regretted it immediately, as Irene’s shocked look melted back into her usual smug grin.

“Oh, thanks for reminding me. Mom and Dad are out of town again. Too bad they didn’t tell you, guess they just care about me more,” Irene hummed.

“Yeah, because no way they’d think that you’re responsible enough to keep me in the loop,” he muttered sotto voce.

“Blow me, dick. Anyways, we both know that when they’re off on business, they don’t take calls. Meaning that somehow, you found a threat even weaker than you are. Now, be a good little nerd, go back to your room, and play Fortnite or something.” Irene flicked her hand dismissively, shooing him from her room with a crinkle of her nose.

“Nobody plays that anymore,” he muttered, but did as she asked. Last time their parents were out for a few weeks, he’d had to explain to them how he’d ‘fallen down the stairs’ and had broken his arm in the process. While it seemed like Irene had learned not to escalate things to that extent, he didn’t want to push his luck.

Normally, that would be the end of it. Life would go on as normal. But, three killstreaks later, Henry was feeling a bit cockier than normal, and he thought of how panicked Irene had looked back when he’d first called out the phone.

He slipped off his headphones, hearing her loudly singing from the bathroom. That meant that he probably had five, ten minutes to spare before Irene was back in her room. It was the perfect chance, and one that he wasn’t going to miss.

Henry darted from his chair, his long footsteps eating up the space between their bedrooms in an instant. To his surprise and delight, she’d left the phone lying on her bed, in a perfect spot for him to claim.

As Henry examined it, he noticed just how odd it looked. There were no logos or branding on the device, and it looked almost like a prop from some sort of movie. There was a camera located on the back of the phone, but none on the front, another oddity in the generation of selfies.

“Awesome, let’s see what Irene keeps on you,” he smirked, calling her usual array of passwords to the forefront of his mind. He settled on trying her birthday first, clicked the power button, and was immediately surprised to find that the phone unlocked without a password prompt.

“Weird, but convenient,” he muttered. He should have expected that—if she’d really found it on the side of the road, she probably wouldn’t have been able to set up a password. He moved to the phone’s gallery with a small smile, anticipating just what he could find to get her in trouble. Knowing Irene, there’d have to be at least one set of risqué selfies that their parents would never let her live down.

Sure enough, the gallery was full of inane pictures—but none of them were particularly damning. Most of the photos seemed to be of clothes and purses, with some shots of her in a mirror, posing with her latest acquisitions.

“Mom and Dad already know she’s irresponsible with money, though…” Henry muttered, a little bit put out. He went back to the phone’s home screen, browsing the contacts folder to find it was totally empty. Likewise, there weren’t any apps on the device, just a basic camera function and some generic tools.

He clicked the camera curiously, and was greeted with the first sign of something interesting: a logo which read ‘ShiftChat’. The letters in the word reversed themselves, then one by one faded until only ‘tf’ was left. Those too faded, and the camera’s preview screen finally clicked into life.

There were icons for various inanimate objects along the side of the screen, as well as a series of sliders near the bottom. It looked like a surprisingly advanced editing suite for a nameless phone, and apparently it wasn’t even the latest version.

‘New update available! By user request, we’ve added a new subset of tools for you to enjoy. Have fun!’

Henry tapped the dismiss notification, and was locked out of the interface. A loading bar popped on the screen, listing the progress for the camera’s ‘Live-Transformation Features’, whatever that meant. He dropped onto Irene’s bed curiously, kicking his legs and waiting for the update to complete.

Luckily, it only took a handful of minutes. The previous inanimate selection was now organized into a small folder marked with a purse, and there was now a folder marked with what looked like a cartoon dog.

“Well, that’s less than interesting.” He muttered, taking it for one of those lame live effects apps that seemed to be all the rage these days. Then again, it could be fun to play a little prank on his sister, and see what she looked like as a literal bitch…

Hendy chuckled, tapping the dog icon only to be greeted by a dozen or so breeds. That was a surprise, normally these things weren’t that in-depth. He tapped on one at random, and the words ‘Bernese Mountain Dog’ filled the top of the screen. A swipe from his thumb set the slider to ‘Medium’, and he wondered what a ‘Medium’ dog was.

“What the fuck, you little dickbag?”

Henry looked up to see his sister staring at him, dressed in nothing but a bathrobe. In another situation, he might think the sight was sexy. In said imaginary situation, she probably didn’t have her fist cocked at him.

The young man let out a wordless cry of blind panic. He fumbled backwards, lifting the phone in her direction and pressing at the screen blindly. Much to his surprise, she screamed too.

“Wait, NORRF! DghRARF!” Irene’s cry turned into a bark, and she pawed at her throat with wide, confused eyes. Said eyes locked on the phone, and she made a fumbling grasp for it, dropping her towel around her legs. “HRGGHWOOF!”

She stumbled and fell, still reaching for the phone. For a second, Henry thought that she’d tripped over the towel. It was a misconception born from the fact that the truth was an impossibility, something that he shouldn’t be seeing.

Her gorgeous legs were crooked now, her angles stretching, thighs and calves shortening. It gave her a rather satyr-like appearance, save for the fact that her feet ended in paws, rather than hooves. Thick hairs covered her skin, brown from the knees down and ending in a light white on her foot-paws.

Henry turned his attention to her face, looking at her in confusion as her cheeks bulged, as though her mouth had been filled. Irene whimpered like a dog before opening her mouth with a gulp. A massive, pink tongue lolled out, dangling past her chin as she panted.

Her hands tucked beneath her chin, and her fingers trembled and quivered. The reason for this was soon apparent, as they shook themselves into thick and clumsy paws. Fur covered them up to her forearms, shaded much like the hair on her legs.

Henry looked down to the phone in confusion, wondering if this was somehow being recorded. He wouldn’t be able to prove that this was happening otherwise. Much to his shock, he found that the phone wasn’t just recording the changes, it seemed to be inflicting them. There were blue outlines for dog ears and a tail around Irene’s changing form, and they slowly filled in as her body shifted to match.

“HggRUFF!” Irene whimpered pitifully, falling to her knees, pawing at her head in discomfort. Her ears lengthened and drooped, thick and large and floppy. They shook from side to side as a small nub poked at the back of her spine. It slowly creaked outwards, swaying from side to side and taking on a thick coat of shaggy black fur.

“No way…” Henry breathed, and Irene followed his gaze to her new tail. Her eyes tracked the swaying hungrily, and a small trickle of drool trailed down from her floppy pink tongue. It looked like she was hypnotized by the swaying tail, and she slowly turned in place, in an attempt to catch it.

The motion revealed her changing genitals, giving Henry a clear view of her darkening labia. Her increasingly canine sex looked like it was swelling, clenching with an instinctive ache to be filled. He wondered if that meant she was in heat, and felt a faint stirring of arousal at the sight.

“GHHROWF TAIL!” Apparently she could still speak, though her words had a rather canine inflection to them. Her tail wagged as she tried to chase it, her teeth trying to snap at her the tail and failing miserably. “Tailtailtail hynnnRUFF!” She barked, looking up to her brother and pausing with a whimper.

xxx

Irene couldn’t believe it. Though she’d used that awesome app to get rid of a few lame ducks in the cheer squad, she’d never imagined Henry would ever use it against her. Also, since when did the damned thing change people into animals?

She tried to cover herself with her paws, though the brush of fur against her dark nipple and pussy were nearly too much for bear. The girl’s tongue lolled from her mouth, and she gasped with a primal, unrelenting need.

“What’s the matter?” Henry smiled, triumph dripping from his every word. “I thought you liked being a bitch to me.”

“Ha harghf.” Irene could feel her ears sway after the bark, even though it was a muted one. She lifted her left paw from her breasts in a vain attempt to steady them, and she growled as she saw the exposure was giving her brother a hard-on.

“Ooh, I like that. Speak.”

“WOOF!” It caught her off-guard, and Irene fell onto her forepaws. Her eyes went round as saucers, and her tongue dangled from past her chin. “WOOF! STOPGHRUFF! AROOF!”

“Stop? Why would I ever do that?” Henry crooned. He leaned in close towards her, tapping her nose with his finger. His other hand swiped at the phone, and Irene’s body began to heat up once more.

Her breasts hiked as her breathing grew heavier, thick and soft flesh welling up in pairs along her chest. The girl’s eyes glazed somewhat, and she groaned as her nose pressed against his finger. Two loud snaps filled the air, her shoulders and hips popping as though she was being held at the hands of some transformative masseuse.

“Hhrryyyynnn…” She whimpered, looking up to Henry pitifully. Even if her jaw was moving to better fit her tongue, she also couldn’t keep herself from panting. “Ahuhahuhahuh…”

“Unless if you’d like putting that tongue to better use,” Henry continued, keeping the phone fixated on her. He patted his lap, leaning back on her bed and tugging at his jeans.

Irene was conflicted. She was horny, hot, and needier than she’d ever been in her life. On the other hand, she also didn’t-

“Good girl.”

Fuck. Irene’s eyes bulged, and she dropped onto her six fat teats, wriggling from side to side to feel them against her bedroom carpet. It felt good, but was nowhere near as incredible as being called a… She couldn’t even think of the words. “Huhuhuhahhuhhh…”

“Oh? Someone liked that,” Henry laughed. “What was your catchphrase again? ‘Blow me?’ Seems fitting now.” He pulled his cock free of his pants, and a delightful scent flooded her nostrils.

Irene closed her eyes to try and steady herself, but her body moved of its own accord. She crawled towards Henry, bumping her nose against his cock and breathing deeply of his scent. She was horny, and there was a man here—a master! Her master…

Her jaw fell slack, and she slowly opened her eyes to see her step-brother’s magnificent dick. Slowly, she nudged her nose beneath his length, lifting it atop her muzzle to better see it. Predictably, he throbbed in response to that, and her heart hammered all the harder.

“Hnnghhynn…” Irene whimpered like a bitch and loved it. She flicked her tongue forwards, pressing it against Henry’s balls and angling her head back. She trailed her massive tongue along him from shaft to tip, tasting his incredible flavor.

She knew that she shouldn’t want this as much as she should. She also knew that this was her chance, her very real chance to please her master. And, if it meant being human again, that was an added benefit.

Irene worked at Henry like a pro, taking him into her canine mouth and pressing him against his cheek, teasing him with huffs of warm breath. She shifted her head slightly, just enough to let his length fit beneath her tongue, sandwiching him between it and her soft gums.

She couldn’t bob her head back and forth—her neck had stiffened a bit too much for that. However, she certainly could rock back and forth on her paws, wagging her tail all the while. Irene could feel him tense, and she pulled back, licking him as only a dog can lick their master, wetly kissing him with her tongue again and again and again.

To her delight, it was enough for him to cum, his hot seed splashing into her mouth, against her wet nose, along her furry muzzle. She licked her muzzle clean and sat on her haunches, waiting for him to restore her to normal.

“Damn, that was good. So, a promise is a promise,” Henry breathed, looking to the phone. He lifted his finger to it curiously, pausing mid-motion. “But… You’ve never kept yours before. I do like you like this…”

Irene looked on in shock as the camera pointed at her, and she turned as if to run. “NUHRRUFF!”

“Like a bitch,” Henry cackled. “Let’s start with this little ‘body’ slider…”

Irene fell onto her fat teats, groaning and writhing on the floor. Her hourglass figure, which she’d miraculously maintained until now, began to deform. Her chest barreled out into a mountain dog’s ideal form, and her breasts sank back into herself. At the same time, her gorgeous red hair dwindled to a muted brown and black, until she was indistinguishable from an average Bernese Mountain Dog.

“Huh, ‘mind’? Well, it’s no fun if you’re all the way gone. Maybe just to eighty-percent.”

Irene’s head ached, her world spinning like she was drunk. Her eyes glazed, and she struggled to remember anything she’d learned in school, even basic math. She knew who she was, she knew that she used to be a person. But she also didn’t even know what month it was, or even what year.

“Oh hey, ‘heat’ is an option? Well, we have to put that all the way up.”

That. That was her breaking point. Irene howled, howled with need. She’d thought she knew what it was like to be horny before. She’d had cravings, had needs. Those seemed like fond memories now, compared to the complete and total need to be filled.

She darted towards Henry, her master, only to realize that he couldn’t—he’d just cum. Enough of her human brain remained to remember that, just as enough of her human brain remained to remember her ‘collection’.

Frantically, Irene scrambled beneath her bed, whimpering with a mixture of shame and need. She took a dildo, the biggest, first one she could find, into her mouth, tasting its rubber and the motes of her own flavor along it. Then she wedged it firmly in the gap of her closet’s door, turning herself towards it, presenting herself.

She slid back onto it, and her world lit up with pleasure beyond pleasure. She was a bitch, was a Bernese Mountain Dog, was nothing but an animal sating her basest of needs. Best of all, she was a good girl, and she was plugged full of the best sensation she could ever imagine. “HGGRUFFF! AhuhAHUHAUH!!”

“Wow, and I thought you acted like a bitch before,” Henry laughed from her bed, hopping to his feet and looking at the phone. “Not bad for a first use, but I think we’re just getting started…”

Irene wasn’t so stupid that she didn’t know the ramifications of those words. At the same time, Irene was much too horny to care.