Not really, family has to stay together no matter what

Five minutes of making out later, Declan and Sonja walked into the house naked, both brimming with the Contagion and ready to give it to the rest of their family. Declan laughed a little, knowing none of them were going to resist and would probably just be glad he had given in. He was proven right almost immediately when they found Cora in the kitchen, stripped naked and bent over the table, just waiting. She didn't look over her shoulder at them, though she must have heard them coming; she just slowly waved her ass at them, pussy juice dripping down her thighs.

"Well, if that's not direct, I don't know what is," Declan said as he walked up behind his other older sister. Sonja wandered around the kitchen, peeking into the living room to see that the two younger women of the house were nowhere in sight. Probably upstairs, she figured, waiting for their big brother to come and fuck them. They'd get their turn, Sonja knew, but for the moment, Declan was clearly focused entirely on Cora. She walked around the kitchen table to look at her younger sister, bent over and practically panting with anticipation.

"Sonja, you look...so good. Is...is this what it did to you? Do...do I have smaller tits than you now?" she asked, breaking out of her amazement as she processed Sonja's now massive boobs. Her expression of amazement turned into one of shock, and not just from seeing her older sister's body: Declan had walked up to her proffered ass and gripped her by the hips, nudging her rear with his dick.

"Were you this wet when you were masturbating upstairs? Trying to get me to come and fuck you?" he asked, enjoying the softness of her body. Every one of his touches set off a new wave of shuddering in Cora.

"No, I've...never been so wet. I could hear you two outside. I could hear what Sonja was saying. I...heard you beg for him to breed you," she said to her older sister.

"It felt good. Really good. Having sex was amazing. Getting filled up with cum was even better. Do you want to know how good?" Cora nodded silently and Sonja's smile grew wider. She looked past Cora and, without warning or preamble, Declan thrust inside the second of his four sisters. The penetrated woman couldn't do anything but gasp, her pussy convulsing around Declan's thick cock and hungry for him to start thrusting.

"Don't hold back," she said quietly, arching her back and pushing her hips back until every inch of her little brother's dick was stretching her out. "I want you to fuck me, Dec. Don't make love to me, I need to fuck. Give your nympho sister the dicking she deserves for teasing you so much. I'm the one who gave Vikki and Adeline the idea too. It's all my fault!"

"Well, if it wasn't for that, I probably would have taken a lot longer to cave, so here's a little thank you, just for you!" Declan grunted with effort as he plowed Cora, giving her what she begged for. Finally, she screamed, the sounds of her ecstasy echoing through the house and undoubtedly inspiring the same lust in her sisters upstairs. Climax, brought on by hot, incestuous sex with her hung little brother, ripped through her and finally satisfied the nearly painful ache of horniness and arousal that had tormented her for days. Though that didn't stop her from wanting more.

"You made me cum, Dec! Fuck, don't stop! Pound me harder! I want more of that big dick!" Cora begged, her impassioned voice carrying easily.

"Shit, you're the one who's going to make me cum!" Declan grunted, trying to continue fucking his sister without releasing the contents of his balls.

"Yes!! Fuck yes! Shoot it all up inside me!"

"You want to get bred like your big sister, pumped full of babies until you're pregnant?" Sonja asked, watching as her sister continued to be rocked by bliss, something she didn't begrudge her at all.

"I don't care, I just want cum in me! It always feels better when it's inside! I want to feel it oozing out of my fucked full pussy!!"

"I never knew you were such a slut," Declan said with a strained voice, struggling to hold on just a little longer.

"I am, I totally am! You've never seen me moaning and horny for dick! I always had to use dildos and try not to scream! Now I can just get my little brother to give me a good, deep fucking!! Do it Dec, I can feel how close you are! Blast me full!!" He couldn't hold on any more at that and finally let himself cum. Cora came again as she felt thick jets of cum shoot into her, the feeling setting her nerves alight. Carnal satisfaction like nothing she had ever felt washed through her right behind her climax, soothing her aching and burning flesh. By the time Declan was finished and pulled out of her, she was glad to collapse to the floor and lean against the wall, utterly satisfied for the first time in what felt like years. She looked up at her little brother, seeing his altered body for the first time, and wondered if he had any more cum for her and her own very slightly changed form.

"Holy shit, Cora, how horny are you? You just got the fucking of a lifetime and I can tell you already want more," Sonja said, kneeling down so that the two women's equally massive breasts squished together.

"I can't feel my legs, but my mouth still works, and I love to feel a man's prick throbbing on my tongue," the dazed woman said, licking her lips.

"I think Declan needs to go tend to his younger sisters, but maybe I can help you with that tongue," Sonja said before the two women locked their lips in a sexy kiss. Declan almost wanted to grab Sonja's butt and give her another deep fucking, but he was curious about the state of his other sisters. Limiting himself to just stroking his ever hard dick, he left the kitchen and walked up the stairs.

Hearing the squeaking of a mattress from Vikki's room, he decided to start with the younger of the two. He was glad he did too, when he saw Vikki completely naked on her bed, stretched out and desperately masturbating. Three fingers on one hand were knuckle deep in her pussy while the other tended to her clit, rubbing and squeezing it. Declan's balls churned with a fresh load for the little teen blonde minx in front of him and he stroked his cock faster.

"Want something to replace those fingers?" he asked, fully stepping into the room and attracting Vikki's attention. She looked at him with eyes full of desire and hope, her hands not pausing for a moment.

"Did Cora and Sonja change? Did they turn super sexy when you put that big dick of yours into them? Oh fuck, look at that thing, it's so big. That's supposed to fit inside me?"

"It is and it will. And yeah, they both changed a little. Not as much as Mom and Dad, but Sonja is a proper MILF in the making with tits like Cora, and Cora's just sexier overall."

"Sonja's got bigger tits? Noooo, why does she get to be stacked and I don't? It's not fair...nnnghh...." Vikki whined, her back arching as she had a minor orgasm. That didn't keep her from digging her fingers in even further and masturbating more though. "Come here and infect me so I can have big titties too."

"That's what you want? You want your teen tits to turn into huge knockers like your big sisters'?" Declan asked, his dick not diminishing in the slightest at the thought of his littlest sister with enormous breasts.

"Yessss...." She came again, harder, at his words. "I want them huge, bigger than Cora's, and nice and jiggly. I want to stretch out every shirt I wear. I want to be the envy of girl and the lust of every boy. I want you to come over here and jizz all over me."

"What about me? What do I get out of this?" Declan asked, still walking over to the end of his sister's bed anyways. He saw her eyes dilate even more as he approached, her gaze focused exclusively on his dick as he stroked it.

"You get to be the one who gets to fuck me. The only one. My huge tits will be just for you, big brother. And you can fuck them or squeeze them or suck on them or hold them or just watch them bounce any time you want. I'll be your sexy teen strumpet with huge tits, just aching to tease you into cumming all over them."

"Oh shit, that's hot," he groaned, his cum rising. He knew he was about to hit the point of no return, innocent Vikki's dirty talk bringing him to the edge.

"I've never taken a cock before, you know? You'll be the first. And only. Your dick with be the only one to ever stretch me out. You can have my virgin pussy, ass, and mouth. Just coat me with your jizz and I'll be all yours. Just think how much my big titties will bounce when you shove that cock in me and take my virginity!" Vikki came harder yet at that and Declan couldn't hold back anymore. His hot little sister begging for his seed and cumming at the thought of him taking her maidenhood was more than enough to make him cum. Quickly climbing on the bed and pushing one of her legs to the side, he stroked his titanic length as pearly semen shot from his tip onto Vikki's body, decorating her pale skin with paler cream. Globs of it shot all the way up to her tits while the rest coated her belly and she sighed and gasped, letting out breathy moans as cum rained down on her smooth young body.

"Mmmmm, that felt so good...oh my gosh, Dec, I can feel it sinking into me, it feels so hot. Holy shit, it's in my tits! I...it's....mmmmMMMHHH!!" Vikki moaned and thrashed around as the cum on her body visibly disappeared into her skin until she was just as clean as before. Her wild squirming made it obvious that something was happening though, and when her hands leapt to her chest, it was clear where the feelings were focused. "I can feel it! I feel them growing! Oh shit, wait!"

On unsteady legs that threatened to buckle every few seconds, Vikki stumbled towards her dresser and pulled it open. She pulled out a thin white tanktop (giving Declan a nice view of her firm ass in the process) and pulled it over her head. Declan wondered why she was putting a shirt on when he noticed it shifting without her touching it and he realized what was happening, which only encouraged him to jerk his cock more.

With the shirt in place, Vikki moaned and gave herself over to the Contagion in her body fully, watching herself in the mirror as she changed. Her hips and butt plumped up a bit, her skin ridding itself of marks and imperfections, but the real focus was obviously on her chest. The two firm points of her nipples were the first things to appear underneath the fabric, standing out and at attention. Declan would have loved to pinch them, but he decided to wait until Vikki was finished. From the way her chest wobbled and slowly started stretching the fabric, it wouldn't be long. Her breasts grew steadily and with agonizing slowness, but from the teen woman's pleasure drunk face, she didn't mind. Her boobs stood out more and more, going from one cup size to another at a steady speed. The cotton of the top was clearly starting to struggle too, stretching around her growing tits that wouldn't stop. It was also taking a toll on Vikki, whose face twisted more and more with pleasure, her fingers twitching with the need to sink into her increasingly prodigious melons.

Eventually, the growth stopped and Vikki turned to her older brother, her boobs staying in motion for a good two seconds after she stopped. She was panting from the rigors of her transformation, which of course only served to make her tits heave and wobble. The constant sight of enormous boobs bouncing was more than enough to make Declan cum again with a moan. Looking down from her spurting brother to her own gigantic jugs, Vikki finally couldn't restrain herself and her hands dug into the new flesh. She instantly found out just how sensitive she was, as well as how easily she came from it, her eyes rolling up as she collapsed to the floor, whimpering, cumming, and continually mauling her hypersensitized new tits.

"DECLAN, I SWEAR TO EVERYTHING, IF YOU DON'T GET IN HERE, I WILL HUNT YOU DOWN AND **** YOU!" Declan heard from outside the room. Adeline clearly wasn't going to wait any longer, and with Vikki writhing and squirting on the floor, it seemed like a good chance to find her. Dribbling the last bit of cum from his cock on the floor, Declan walked out and down the hallway to Adeline's room.

She was every bit as needy as the rest had been, standing in her room with her back to him and hands on her hips, completely and utterly naked. Declan remembered the sight of her fresh out of the shower and still damp, and found he liked this just as much. "You'd better not have spent all that man juice on the others, I definitely deserve my share. Teasing you might have been Cora's idea, but she and Vikki wouldn't have been nearly so aggressive if I hadn't upped the ante. So you'd better not slack on me when it comes to that....dick......" She trailed off as she turned and got an eyeful of her brother and his turgid cock. Her breathing picked up instantly and Declan saw a little spurt of liquid flow out from between her legs. In seconds, it seemed like she had gone from her usual domineering, assertive self to a helpless, horny girl.

"What happened to Miss Indomitable?" he asked snarkily, making a show of stroking himself in full view of her. Adeline didn't say anything, just dropped her hands from her hips and let them hang at her side. Declan slowly walked forward, his last sister's eyes clinging to him the entire time. "What's wrong, Ade, something got your tongue? Open your mouth," he ordered firmly and was a little surprised to see her do it, her pretty lips parted demurely. Seeing her obey so easily made his course of action easy to decide. Pushing his shoulders back, he marched forward with all the dominance he had.

"On your knees," he commanded, and Adeline instantly let her legs buckle. Declan's dick was right in her face, hard, erect, and slick. Adeline panted a little harder as his smell surrounded her, making her head spin. "Well? What's wrong? I thought you wanted my dick so bad you couldn't take it anymore? Go ahead, little sister."

Spurred to action, Adeline brought her lips to her brother's dick, gently wrapping them around it. She never would have guessed before, but being on her knees and gently blowing Declan felt incredible. She never would have figured herself for a submissive, but in the moment, she welcomed it. "Mmm, good girl," Declan groaned as she worked his length. She seemed to glow at the praise and the dripping between her legs increased. She worked more enthusiastically too, savoring his dick in her mouth while also striving to maximize his pleasure. "You'll have to ask Cora for some tips, she's apparently a real blowjob slut."

"She's just a slut," Adeline said, briefly releasing his dick to speak. Declan gently grabbed her head and pulled her back to his shaft and she went back to work.

"You shouldn't speak poorly of your siblings," he said. "Right now, you're not looking much better than Cora. Ah ah ah, no talking, more sucking. You're close to getting your treat," he warned, feeling the brunette try to pull away to talk again. She dutifully stopped and continue to blow him, her eyes sliding shut as his hand became more firm, her body shuddering at his control. Declan was on a power trip of his own, seeing his normally disobedient little sister faithfully serving him for his benefit alone. It was far from the frantic rutting he had engaged in with Sonja and Cora, or the near voyeuristic session with Vikki, but her gentle nursing on his dick was sublime in its own way. He was already about to erupt in Adeline's mouth when one small hand came up to gently stroke his length along with her mouth. That slight difference in sensation pushed him over and Adeline hummed hopefully as she felt him throb and twitch. A second later, she was overjoyed to have her brother's semen pouring into her mouth, gulping down the delicious spunk with her lips sealed around his engorged head.

Every single drop of Declan's cum disappeared down Adeline's throat, the normally spunky girl downing the liquid gladly. She might not have craved her impending transformation like Vikki had, but she knew what the inevitable result was and looked forward to it. Broken out of her submissiveness, she got up and pushed a pair of digits into her dripping snatch, fingering herself through her transformation. She didn't see any enormous changes, but almost every part of her was accentuated. Her breasts grew a big bigger, large by any normal consideration, but remaining the smallest in the family. Her waist tucked in a little and her hips popped wider, altogether accentuating the hourglass figure she'd possessed before. Her brown hair darkened and gained volume until it was a glorious wave around her head. Her features refined slightly until she looked like the ideal version of herself.

"Holy shit, wait till my bitch friends get a load of me! They'd kill to look this good!" she said once the tingles of change faded. Ignoring her desire for a moment, she got up and pulled on a perfectly form fitting pair of jeans and a denim jacket thing that probably wasn't supposed to be worn by itself. Or if it was, it wasn't by someone with breasts as big as Adeline had now. It left plenty of the inner slopes of her tits on display, the edges not even coming close to each other. She spent a minute tousling her gorgeous hair and skipped makeup entirely, not needing it in the slightest, before grabbing her phone and posing in front of the mirror in an 'accidentally fap worthy' sort of pose that spoke of innocence and deliberate teasing.

Her phone clicked as she took multiple pictures and then typed up a post to go with them with one hand, the other sliding down her body to slip into her hands. Declan walked up behind her and ground his forever hard dick against her ass, making her whimper and twist her hips to thrust back at him. He could see her post over her shoulder as his hands eased her top off of her again.

'Big brother finally broke but he took me last of the four of us! Good thing I got this new bod or I'd be pissed!' She hit post and Declan had a second to see a series of equally provocative posts cataloguing the last few days and his struggle to fuck his family before she tossed the phone away. Freed of those struggles, he grabbed Adeline by her bare shoulders and pushed her down on her hands and knees before working her pants down enough to see her pussy. She squirmed more, moisture dripping from her petals and her firm butt pushing back at him, ready to take his dick.

"You know, normal people don't post online about how much they want their brothers to give them a dicking," he said, slapping Adeline's ass and earning himself a little yelp from her.

"I hate to tell you, but we're not normal anymore. Plus, it's way more tame than what some of my already infected friends have been posting. Meghan's only posts have been ratings of how good sex is with different guys with accompanying creampie pics and I don't think Pamela is smart enough to even know what she's doing anymore. Talking about how much you want to fuck your brother is basically the standard at this point," she said, her voice becoming more breathy as Declan started to rub at her slick pussy.

"How much do you want me to fuck you?" he asked, shifting so his dick was pressed right at the entrance to her core. She gasped and tried to push herself back onto it, but Declan didn't let her feel any more than the head.

"So bad, please, please fuck me. I need it so bad. Pretty pretty please."

"You sound just like the rest of your sisters. I guess being a slut runs in the family," he said before finally shoving his cock into Adeline.

"I A-AANNNGHHHHH!!!!" she screamed, unable to get words out as she came violently. Declan didn't stop to let her recover though; he kept going, fucking her as hard and deeply as he could, all the while thinking of the other three women in the house who were just as eager for his cock. And that was before considering their parents outside. It wouldn't be right to exclude them from the family for any longer. Looking forward to tight elven pussy, Declan came into his switchy sister for the first of many times.