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Sarah Walton was wiggling around in her bed for literal hours after she'd been put there by her mother, that evening.

She didn't know that just next door, her mother and her brother were engaged in one of the most forbidden acts that they could, and worse still, that union had ended in her having a new sibling...though one that never should have been.

Sweating, feverish and transforming into a werewolf herself, only without the influence of Annabelle Schafer to make her do something she might regret, Sarah shook so violently in her bed that it was scraping the walls, all while the changes of her transformation took effect. Just like her mother and her sibling before her, she could feel the fur spreading up under her skin and then popping through, like grass through the freshly watered earth. Her limbs contorted as pain blinded her, and she could feel her flesh becoming uncomfortably warm and thick as the tainted breast milk sloshed around in her belly, the cause of the entire moment.

It was twisted and sickening all at the same time, and yet, somehow, Sarah felt an arousal building in the depths of her womanhood that she simply couldn't understand, and worse still, she couldn't control it. Even as she felt claws building up upon her hands, she couldn't resist reaching down between her legs to examine her nude form, able to feel a thin, peach fuzz layer of fur popping up around the petals of her most precious flesh. Curious fingertips turned to pawtips as Sarah brushed just one, lightly furred appendage over her clit, and from that meager touch, she thought that she might scream to the high heavens. She suddenly felt fortunate that her voice wasn't working, and even managed to overwhelm her own panic in the moment with a second stroke across the buzzing bud, knowing that it would keep her from passing out in fear.

As her musculature finished changing around her warped bone structure, Sarah was able to focus on the pleasure of the moment a bit more fully, not wanting or willing to question why a thin layer of fur now covered her body, or why she could feel her face growing longer with each passing moment. There was a new and sudden breeze between her legs as a tail began to grow from above the alluring curve of her rump, and she could feel the appendage wagging back and forth, providing a much needed relief to the natural, lustful heat that she felt upon her sex. It was an awful sensation to be unable to properly satiate, and still living with her parents at the tender age of 18, Sarah wasn't as lucky as some of her friends to have an older sister to get hand-me-down toys from. She had only her paws to work with, and they were taking longer to adjust to than she would have liked.

That being said...it didn't take long for her to find her perky, erect nipples poking up from the fur that covered her modest breasts, and once she honed in on her clit, she refused to give it any sort of a break, massaging it with such ferocity that her hips began to thrust at the air, at the imaginary lover that was climbing atop of her and satisfying her every need. There had never been such a male in her life, and she couldn't think of who she might desire, but image was coming into her mind as fluids began to gush from her snatch, soaking her bed sheets and finally giving her reason enough to pause her fingering.

Goodness...this...what is this? What the hell has happened to me? she thought to herself as she panted. She could hear the front door opening and panicked, yanking the sheets up and over her body, all the way over her head in the hopes that she might be able to hide whatever had happened to her.

I'll go talk to Ms. Schafer in the morning...she'll know what to do. I can trust her.

**

When the first sunbeams came around to rouse Sarah from her sleep, the first thing she did was stroke an open palm along her arm.

It didn't matter that she could see the fur was all gone; she had to feel it to be sure that she wasn't dreaming, or perhaps, that last night wasn't a dream, itself. There was no fur on the bed, no claws on her hands, and her face felt entirely normal...but there was still a small stain down between her legs, right where she'd squirted out just a tiny bit of female ejaculate the night before.

"No way I'm talking to mom about that," Sarah muttered to herself, as she slipped out of her bed and pulled a camisole over her body. She normally tried to look presentable around the company of others, but this time, she barely got into her pajamas to go and see Annabelle Schafer...who was sitting on her front porch, as usual.

The way she gazed over to Sarah, it was almost as if Annabelle had been expecting company of some kind. "I'm so sorry that you didn't feel well last night, Sarah. Everyone really missed you at the party!"

Sarah smiled as politely as she could so early in the morning. "That's very sweet of them. I'm sorry I couldn't stay...I really would have liked to! I was having a lot of fun..." she hesitated to continue, before poking her fingertips together, trying to cautiously pick her next words. "But...I felt really strange, and I just had to go home...and things only got weirder from there."

"Weirder? Why, what on earth happened to you, dear? Did you tell your mother?"

"N-no, I...I can't, Ms. Schafer. Could we...maybe talk about this inside?"

"Of course, young lady. Come right on in," Annabelle offered, as Sarah marched up the small stoop to the front porch and right in the door. The moment it was opened for her, she rushed inside and took a seat on the big, cozy couch in the front room, wishing that she could curl up on it without arousing too much concern. "...Well, you certainly were in a rush to come inside. What's the matter, Sarah?"

"It's...kinda personal," she admitted, immediately hiding behind her knees and crossing her arms over them. "But something strange happened last night. I h-had a dream that I was a werewolf...but...that's not the weirdest part."

Annabelle chuckled, as if she had no clue what Sarah was talking about. "How could a dream get much weirder than that?"

"It...made me feel...good. Y'know, in that way."

"For being such a mature, young woman, you sure are bashful about your body. We're both adults, Sarah...you can tell me what's really going on."

"It turned me on," Sarah suddenly blurted out, though she could feel her cheeks burning behind her cover. "What's weird, though...is that some liquid came out of me while I was thinking about it...my bed was still stained this morning. It all felt so real that I'm not sure it was a dream, and...I've never done that before...is it normal?"

"Females can make a slippery mess the same way that males can...it just doesn't get them pregnant!" Annabelle replied, trying to be as playful and lighthearted as she could, though Sarah was clearly shy about it, regardless. "It just means you were very aroused by the idea of being a werewolf...and we've all got things that make us tick, Sarah dear. You just have to be careful who you share those secrets with!"

"Y-you wouldn't tell anyone, right?"

"Of course not, Sarah! You can trust me as far as you can throw me...and I don't think a petite little thing like yourself could throw me very far," Annabelle explained. This time, she did get a chuckle out of Sarah, who looked up from behind her arms just slightly. Her eyes of ice blue sparkled with relief, and Annabelle took a seat next to her on the couch. "However..."

"Hmm?"

"That was no dream, young lady. I'm afraid you really did turn into a werewolf."

Sarah giggled and gave Annabelle a gentle nudge with her shoulder. "Okay, okay...I get it. You like cracking jokes to make me feel comfortable, and it worked."

"This is no joke, young lady...why do you really think your stomach was upset last night?"

"Be-cause...I'm lactose-intolerant?"

"Breast milk doesn't have any lactose in it, sweetie."

Sarah felt her stomach turning again in an instant as she bolted up off of the couch and stood over Annabelle, glaring. "You're joking. Please tell me you're joking."

"I'm afraid I'm deadly serious, Sarah...you, your brother, and your mother...you all drank from the same tainted batch, and now, you're all a part of the family, forever...there's only one piece of the puzzle that's still missing."

"You will never do that to my father!"

Annabelle was still giggling daintily behind her hand as Sarah ran for the door. "No, my dear...I won't...but you will. That need isn't going away anytime soon, and there's no other man in the world for you, anymore...just wait until he gets home from that business trip!"

"You're a sick, twisted bitch if you think I would ever sleep with my own dad!" Sarah yelled back, as tears welled up in the corners of her eyes. She walked out of the house and slammed the door, but there was no reaction from the other side, or from the neighbors around. When she made it back into her own home, her mother and her brother were nowhere to be found...there was only the roaring of an engine as her father pulled into the driveway, returning from his trip earlier than anticipated.

She had to avoid him. She just didn't know if she could.

**

The evening couldn't have progressed more awkwardly for Sarah, who did everything she could to avoid so much as seeing her father, much less interacting with him. This was complicated even further by the fact that her sibling still hadn't shown his face all day, and her mother was nowhere to be found.

"And you're really sure that you haven't seen them?" Frank asked his daughter for the fourth time, trying to hide the sensation of panic that was starting to spread across his face.

Sarah scratched the back of her head aimlessly, playing with her hair and trying to come up with an excuse. "The last time I saw them, they were having a drink at Ms. Schafer's place. I think maybe Mom had a little bit too much, last night."

"She does have have a soft spot for the sauce from time to time, but...this...this just isn't like her. It's the middle of the afternoon!" Frank muttered, his frustration and concern starting to boil over as Sarah sat in the living room, trying not to make the situation anymore uncomfortable for her father than it already was.

For her, it was a struggle to see him in such distress, and thanks to the terrible effects of the tainted milk, she could think of only one way to fix the problem.

"Heh...you never know. Maybe she isn't coming back," Sarah joked, managing a quiet and meager chuckle as she did.

Frank immediately turned his glare down to her and crossed his arms over his chest. "That isn't funny, young lady. Do you want your mom out of the picture or something?"

"If that means I get to have you to myself, then...hell yes, I do," Sarah spoke without realizing it, thinking that the words were still safely trapped in the recesses of her mind. Her hands flew up to cover her face in an instant, her eyes grew wide with despair, and her skin burned all the way up to the tips of her ears as she flushed with bashful warmth, unable to hide from the angered and disgusted gaze of her father.

"S-Sarah...what...what the hell did you just say to me?"

Annabelle Schafer was an honest woman, if nothing else, and she'd warned Sarah about what would likely happen if she saw her father. He was the head of the household, making him a natural alpha in Sarah's changed perspective, and no matter how she fought the urges that were bubbling up, she couldn't bite back hard enough against them.

It was only a matter of time before she lost control, and tufts of fur were already starting to sprout up from her flesh.

"Mom has had you all to herself for the last 24 years, Dad...don't you think it's only fair that you get around and see what else the world has to offer?"

Frank nearly spat at the ground as he listened to his usually bubbly and innocent daughter lay an accent on him that was thick with lust and deceit. "Of course not! I'm beyond happy with your mother! Why on earth would I risk losing that, and with my own daughter, no less?!"

"Oh, if you only knew what I was capable of, Daddy dearest...that might change your mind a little bit."

Wrought with concern for his daughter's behavior and the whereabouts of his kin, Frank tried to keep a cool head as Sarah crawled off of the couch. His jaw opened to speak, but then simply hung there as fur began to spread over Sarah's body...it was growing even faster than the night before, and her claws were already to their fullest length when Sarah stood up in front of her father and started pushing him back to the wall. "To leave a female like myself in a state of need could be a deadly mistake for you, Daddy...why don't you just do the right thing and pound my tight, eager little pussy?"

" Sarah! Where did you learn to talk like that? N-no, heavens NO! I couldn't!" he continued to protest, but he underestimated just how strong his daughter would become as she changed. Her muscles grew to proportions too great for her own body, and she lurched forward, slamming her father into the wall harshly and digging her claws into his dress pants. The smooth, silky fabric didn't stand a chance against sharp, jagged claws, and Sarah was grunting with delight when she saw the bulge resting within her father's briefs. "Please...p-please, stop this, Sarah! Stop it right now!"

Frank couldn't bring himself to strike or harm his own daughter, and for a moment, he began to wonder if she really was his own flesh and blood...but her eyes, as they gazed up at his, were still her own...the eyes he'd seen the very day she was born. They never changed, but now, they were glazed over with a lust that Frank hoped he would never see in them.

Sarah, however, wasn't giving him a choice.

"You're the last one left, father...just give me this cock..." she paused, reaching forth to grip the bulge as she coaxed his length through the front flap of his briefs, "And it'll all be over soon, I promise...you'll love it..."

Frank was trapped in a moment of true despair...he couldn't possibly defile his own daughter, but if she didn't, she might end up killing him, and who knew what else might come of it. Slow, reluctant blood began to fill his member as his own daughter burst from her clothes in a flash, fully transformed into a werewolf, and pressed her burning, drooling folds to the tip of his manhood. He did his best not to squirm as she held the shaft tight and pulled it in further, pressing a leg up to the wall to create a perfect angle for standing penetration.

Regret couldn't describe how Frank felt about what he'd done, but pleasure couldn't describe how amazing it felt, either.

"Sarah...we...we can't..." he weakly protested, but the fight was entirely out of him as his daughter slammed her hips forth and hilted his cock, her body moving with a level of experience that betrayed her innocent appeal. Frank felt his breath fade into shivering gasps as Sarah pounded in against him, literally milking him of what she so desperately needed.

His final protests faded as he felt his teeth growing too sharp and long to speak around, and his face began to distort...and he knew that it was too late to look back.

With shaking hands that started to cover over with fur, Frank gripped his daughter by the hips and pulled her in closer, until she was able to wrap her other leg around him. He held his daughter up to his hips and finally fucked back against her, finding his body overwhelmed with a new sense of strength as the infection of lupine blood mingled with his own. Sarah leaned over his standing frame and bit down harshly upon his shoulder, all while his musculature grew out of control, and his insides fluttered with a delightful, canine pleasure.

His mind was fading just as quickly as Sarah's had the night before, and soon, he was acting purely by what his physical body demanded, as fur spread across his form like a plague across the slums.

That's it, daddy... Sarah thought, as she clung to her father, her swollen breasts heaving into his chest as she was literally bounced on his cock. Her own orgasm was hardly a concern; all that mattered was that she could work her inner muscles skillfully enough to bring her father to orgasm...and she didn't realize how skillful she was.

There was no sudden cry of ecstasy, or even a warning, as Frank continued the process of his change. There was, however, a telltale POP as the knot around his newly changed cock speared into his daughter and stuck the pair together, and a joined howl of father and daughter as his full, swollen orbs drained themselves into her, pumping her womb full to the brim with a veritable flood of incestuous cum.

The next door over, Annabelle Schafer could hear the powerful, sensual moans of a father and daughter who had just crossed a line together...and added another pure member to the growing werewolf family.