No one can save them from themselves

Declan was mercifully spared from more **** for the rest of the day and for once felt some measure of peace as he fell asleep. The next day, which started with a raging flagstaff of morning wood, was very much different.

Stuck in his own room until his erection disappeared, Declan desperately tried to distract himself to no effect. With no end to his pillar in sight, he was left with three options. One, stay in his room all day, which didn't sound like much fun or very realistic. Two, walk around with it tenting his pants all day, not a good idea given how lustful his sisters had been and his conversation with Sonja the day before. Or three, give in and relieve himself.

It was the last one that he feared and wanted most. On the third day of their isolation, he had given in to that urge and had been horrified by where his mind had wandered. The same place his mind wandered now as his hand began stroking his shaft. He imagined Adeline and her curves swaying in front of her, rolling her hips and chest with her belly winding sinuously in between, tempting him to touch her swaying flesh. He thought of Cora pressing her enormous boobs together and bending down so his face was inches from the bottomless crevasse of her cleavage. He envisioned Vikki brushing her pale hair to the side as she leaned down, little lips resting just in front of his aching dick beading with precum until she leaned forward and gave it a tiny kiss, a thin strand of liquid connecting her lips to his cock. He fantasized of Sonja on her hands and knees in front of him, looking over her shoulder as she thrust her big ass at him and her tits hung from her chest. His penis was right in front of her pussy, practically nestled in her folds and ready to sheath itself in her soaked depths.

His fantasy shattered as he suddenly came, his jizz splattering on his floor instead of his sister. Overcome and cumming harder than he could ever remember, Declan just closed his eyes and thrust his hips into his hand, spending what felt like the entire contents of his balls on the wood of his bedroom floor. It was only when he was finished and fell back on the bed that he felt the revulsion of getting off to thoughts of his sisters. Struck with shame, he could only clean up his wasted cum and at least be grateful his cock had gone soft.

Leaving his room only once he was sure he had **** every lewd imagining of his siblings out of his head, he walked down the hallway, glancing at his sisters' rooms to see who was up. Sonja and Cora's doors were still shut tight, and Adeline's was open but the room was empty. By chance though, Vikki's door swung open just as he walked past.

"Declan, come in here and help me with something," the short young woman said, quickly grabbing her brother by the wrist and dragging him into her bedroom, closing the door behind them before he could protest.

"Vikki, stop! If you need something, you can just ask, you don't have to...abduct me," Declan complained as he was pulled to stand by the bed. For how diminutive his youngest sister was, a full head shorter than him, she had some impressive strength. Though from how she stood in front of him, seemingly a little shy, you'd never guess it. "So what did you need?" he asked when she didn't say anything.

"Oh, right. I was wondering your opinion on something. How do you think this shirt looks on me? I feel like it's a little baggy," Vikki asked, showing off the crisp white button up she was wearing. The fabric was a little loose around her body, but only in the sense it wasn't stuck to her skin. It still showed off enough of her small swells of her tits to be decidedly attractive, especially given the two buttons she had left undone.

"I think it looks good. Er, fine. It looks...yeah." Declan fumbled for words, not wanting to upset the delicate balance they were all maintaining with a misspoken word.

"Really?" she asked, starting to undo more of the buttons. "I've got another one that I think looks better, do you want to help me compare them?" Without waiting for his answer and having reached the end of the buttons, Vikki casually pulled her shirt off, revealing a prime expanse of smooth, teen skin, along with jiggly tits bound in a fancy cream bra. She looked up at him as a picture of innocence, but neither of them were fooled.

"Unless there's something else you'd rather do...?" Vikki asked, her tongue darting out for just a moment to lick at her lips. "Is there anything your little sister can do for you, brother?" In that instant, desire pushed against sense in Declan's brain, his fantasy from not long before, Vikki on her knees and ready to suck him off, clear in his mind. He wondered if that would come to pass if he gave in to this teen seductress. The battle raged in his head, but his will slowly beat down his desires.

"I'm going to go get some breakfast," Declan said, purposefully looking away from his partially unclothed sister and walking towards the door. He heard her gasp and whimper behind him, but didn't turn for fear he would stop and give in. He **** himself to walk out and close the door behind him, cutting him off from his sneaky sister. He still had to stand a minute and calm himself though, his cock having risen to half mast during the ordeal. It was only when he felt fully in control of himself again that he started down the hallway.

He didn't get far. At the end of the hall, the bathroom door opened and out stepped Adeline, startlingly and strikingly naked. Her skin was smooth and clean after a shower, her brown hair still slightly wet and sticking to itself.

"Oh, sorry Dec, I didn't think anyone would be out here. I like the cool air on my skin after a shower, so I didn't put on a towel. You don't seem to mind though." Indeed he didn't, his eyes drinking in the sight of his curvy little sister. She pressed her plump boobs, just a little bigger than Vikki's, between her arms, making them squish and look just slightly bigger. Her groin between swaying, sexy hips was utterly bare, freshly shaved and enticing. Declan wondered what his thick rod would look like pressed there, bulbous and leaking against the skin of her toned belly. Adeline must have been wondering too, for the curious tilt of her head, arched eyebrows, and slightly open mouth.

For whatever reason, Declan had an easier time turning away from this sight than the last one, a shocking thing given how much more skin was on display. He still struggled, naturally, but managed to leave Adeline behind with relative ease compared to Vikki. He didn't hear his brunette sister say anything as he walked downstairs, but he could feel her eyes on him until he eventually heard a door close.

He ate breakfast alone and unbothered, watching TV in a foolish attempt to distract himself. The only thing on was talk of the virus or contagion or whatever it was. People speculating about what it was, where it came from, how it caused the changes it did, if it caused changes at all. All of it was pointlessly stupid to Declan, who was stuck in a town with what had to be a rising number of people infected with it and had no illusions about what sort of changes it could make to a person. Of course, the alternative was to watch the other channels, which had basically become porn stations, people fucked willingly or not on camera for all to watch. Thought he did find one interesting station that was a mix of the two, two naked and infected newscasters on camera talking while two more people were on their knees under the table servicing them, the camera naturally pulled back far enough to easily see under the already clear surface.

Resigning himself to boredom, Declan turned off the TV and sat listlessly on the couch, looking at and thinking of nothing. He heard his sisters moving around the house, but thankfully none of them bothered him. He wasn't sure he could have taken more of their teasing. At some point, he blearily opened his eyes, having apparently fallen asleep at some point. He would have liked to go right back to it, but he **** himself awake, determined to check on his sisters. Despite their blatant advances, he still cared about them and wanted to be there for them if they needed him. Emotionally, that is.

Walking upstairs, he saw that Sonja, Adeline, and Vikki were all not in their rooms. He could hear Cora moving around in her room though. Not thinking, he pushed open the door, wanting to at least see his older sister. And see he did.

Cora was sitting by the window, completely naked with the curtains pulled open. She sat looking out them, breathing heavily and bent forward. The angle did wonders for her ass, making it look bigger than it probably was. Not that he intended to step forward and find out. He had more to look at anyways. Namely her sister's enormous breasts, so big that their sides swelled past her torso. Even just their sides were mesmerizing and Declan wondered what they would look like head on. He had seen Adeline's, but those didn't seem like they could be considered the same thing. The difference was just too ****.

"Like what you see, brother?" Cora asked, her words halting and unsteady. She squirmed in place, her glutes and back muscles flexing, and Declan realized she was probably masturbating. Scratch that, definitely masturbating, judging from the moan she let out. "I know I do," she said, not turning from the window.

"What are you doing?" Declan asked, almost afraid of the answer. Cora smiled over her shoulder, tousling her blonde hair wildly.

"Why don't you come here and see?" she crooned, giving him some of the best bedroom eyes he had ever seen. It almost worked too, but he held his ground and didn't move. Cora pouted, but turned away to look back out the window. "They've been going at it for days. Literally. Sometimes I sit up and watch them fuck. I was bi before, but holy shit, I definitely would be now if I hadn't been. Some of the things they've done...it makes me want to go join them."

"You can't," Declan said, knowing she was talking about their parents. "You saw what happened to them. You'll go crazy."

"Maybe. But I've been watching more than just Mom and Dad. Other people walk by sometimes, normal except for the naked pornstar bodies they all have. And I've watched that video online a ton. Not everyone goes nuts. Plenty of people stay themselves. It might be worth the chance. And besides, can you imagine these jugs of mine even bigger?" In that moment, Declan struggled not to, along with keeping his fierce erection in check.

"Promise me you won't go out there," he asked, nearly begging. Cora looked over her shoulder at him again, turning more so he could see more of the enormous slope of her breast.

"Come over here, get your pants off, and give me a reason not to," she said, entirely serious. Declan almost gave in at that, imagining for a moment walking over to fuck his sister. But he banished the thought before it could take hold.

"Just...please. We can get out of this. Just don't give in," he pleaded, stepping out and closing the door behind him.

"Maybe," he heard before the door separated them.

Dizzy, tired, and overwhelmed, Declan slouched his way downstairs, practically throwing himself into one of the recliners in the living room. No one else was there, giving him the solitude he craved. His erection slowly diminished and it seemed to take his energy with it. His eyelids drooped lower, lulling him gradually to sleep.

He woke up slowly a while later to the sound of lips kissing. Slowly roused from his slumber, he looked to the couch across the room and saw two girls there. His vision cleared more and he finally recognized Cora (thankfully dressed) bent over Adeline, the younger girl's shirt pulled open to show off her cute boobs and to let one of Cora's hands rest there. Apparently oblivious to his changed state of consciousness, the two girls kissed gently but enthusiastically.

Declan tried to get up without disturbing them, but the chair creaked, giving him away. Cora and Adeline both looked his direction, saw his eyes watching them, and went right back to it, whispering just loud enough for him to hear.

"Looks like your big brother finally woke up," Cora said between pecks, starting to massage and squeeze her little sibling's breasts.

"About time. Do you think he likes this? Watching us make out?"

"I don't care; I'm not doing this for him, I'm doing it for me. And because your sexy little lips taste so good..."

"You do too, Cora. But squeeze my titties more, they're so sensitive," Adeline whimpered, pleading. Cora laughed throatily, but obliged, working her fingers faster on the younger girl's smaller chest.

"What are you guys whispering about...?" Vikki asked as she suddenly walked into the room, her eyes immediately catching on her older sisters making out and her brother watching with tented pants. Licking her lips hungrily, she quickly shucked off her shirt and walked over to her sisters, thrusting her chest out. "Got room for one more?"

"Of course," Cora said, pulling her lips away from Adeline's with a wet pop. "The more the merrier. Ade, why don't you work on your little sister's boobs while I work on yours?"

"Good idea. Bring those teen tits over here, Vikki, my lips are already warmed up." Vikki quickly did like Adeline wanted, kneeling next to her slumped sister and leaning over so her handfuls were hanging in her face. Adeline didn't waste a second, reaching upwards to gently kiss and suckle at the pebbled nipples offered to her. Vikki sighed happily, loving the sensation of incestuous lips on her tits.

Once again left reeling from the lurid sight on display, Declan rushed out of the living room, disappointed and enticing calls from his sisters chasing after him and his adamant erection. He could practically feel his psyche cracking under the stress of resisting his excruciatingly female siblings. Searching for anything to distract him, he went to the kitchen and gulped down a glass of water, breathing heavily against the counter. He tried to **** the thoughts of sex out of his head, but every time he closed his eyes, his sisters appeared engaging in and tempting him with all manner of debauchery. Still, he tried and tried and tried harder, until something that wasn't sex finally registered in his head.

He could smell fresh air. Normally something pleasant but unremarkable. With the house having been sealed shut for days on end, it was noteworthy and concerning. Opening his eyes, Declan saw that the sliding door to the backyard was wide open. Confused and worried, he walked over to pull it shut, but froze when he saw Sonja standing outside, slowly stripping off her clothes and looking at him.

"Sonja?" Declan asked in a daze, stepping out into the backyard and letting the sun hit his face. "What are you doing? We can't be out here, the air..."

"We can be out here. I can't be any hornier than I already am, so I'm fine. And I left the door open just for you. I want you at your breaking point," his oldest sister said, turning and thrusting her panty-clad ass out for him to drool over.

"Y-you said you want...weren't....competing..." Declan stammered, hands clenching at his sides. The last few days of self-denial, teasing, and the current stimulus of the Contagion in the air and his gorgeous, incredible, fuckable sister stripping in front of him all came together to keep him helplessly rooted in place and to keep his erection at full power.

"I'm not, this isn't a competition. I'm winning, little brother. Because I don't think you can resist these tits," Sonja said, pulling down her bra to expose her large breasts while arching her back to push her chest and ass out even more. He couldn't even bother to try and hide his lust as he watched her continue to peel out of her clothes, her eyes carefully watching him as well.

"Declan?" Sonja said at some point, startling him out of his staring contest with her body. "You're still in there, right?"

"Sonja, I...we...can't..." he stammered, trying to hold on to his rapidly flagging control.

"Why not? Why shouldn't we? We can't keep this up forever. Cora definitely doesn't want to, she told me she's been watching Mom and Dad. And not everyone goes crazy. I didn't believe her at first either, but I checked and it's true. We could all stay ourselves. What could be better than having a perfect body and getting to have sex with your four hot sisters?"

"What if we don't? What if one of us goes crazy, or doesn't remember the others, or turns into a monster? Would you want to end up a drooling cumrag of a woman?" he asked, a slightly manic look in his eyes.

"That doesn't sound ideal...but from what I've seen, no one really regrets it. Everyone who ends up infected seems happy, even if they don't stay themselves. And to be honest...I'd be okay being your drooling cumrag." Declan groaned at the thought, having to hold back from cumming at Sonja's quiet admission. He'd thought he'd never want his sisters to lose themselves, but the thought of his older, almost MILF of a sister gorging herself on his semen like it was the only thing she needed had him achingly close to release.

"Come on, Dec, just do it. You can't keep fighting it and we all want your dick. Either do it now or you're going to find someone riding your morning wood," Sonja crooned, dropping her bra to the ground and pulling down her panties around her thighs. She slowly lowered herself to her hands and knees, thrusting her big, beautiful ass in her brother's direction. "Come on and we can both have what we want."