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Sarah couldn't stop thinking about her brother's cock. She had only seen it when he slept. She crept into his room one night while she had some trouble sleeping. She planned on borrowing a movie or a comic or whatever she found at all interesting. She noticed him on the bed, wearing pyjamas and covered by a blanket. She also noticed his large, erect member pitching a tent in his pants and the sheets covering them. She stared at it for a good while before doing wha she came there to do.
The sight of him that night invaded her thoughts fairly frequently. She found herself masturbating while fantasizing about it the next night. She tried to stop herself by reminding herself that she was jilling off to the thought of her own brother, but that fact only made her wetter and eventually made her achieve an intense orgasm.
She couldn't stop herself from returning to his room on the third night and very slowly move all fabrics covering his penis. She had to at least see that dick. The sheets and pants were easy enough to remove. Then came the underwear. She held his dick in place with just two fingers and very slowly pulled the undies above his boner and then down, practically peeling them off his cock with how sticky they were. Then came the smell. That extremely pungent stench. She already smelled his regular stench, being so close to him. It was something she became partially used to. But now it was actually worse. Years-old piss, cum and sweat created a potent musk. She pinched her nose. His cock was more than half as thick as her slim torso and almost as long. The glans, fully covered in foreskin, looked lumpy. On the side facing his belly was a thick vein running from the top to the bottom, from which other other slightly thinner veins sprouted almost like tree branches. He had big, smooth balls the size of melons. She gripped his cock and the skin clung tightly to his glans as she pulled down on it. With determination, she slowly uncovered his filthy glans. It was completely covered in thick yellowish smegma except for a small area around the urethra. The whole thing vaguely looked like a dirty caulliflower. And the smell became stronger.
Out of morbid curiosity, she uncovered one of her nostrils and sniffed, then imediately covered it again. She found the smell to be revolting, and yet... also somewhat arousing. She clamped a clothespin on her nose and took out a pack of large napkins she brought with her, then got to work. She got up on the bed, stood between his legs and used a napkin to grab almost a handful of smegma with one hand while holding his shaft with the other. She wrapped the wad of cock-cheese in the napkin and squeezed it out of curiosity. The stuff felt quite hard, but it did compress between her fingers. There was still smegma in the spot where she removed some of it. It looked thinner, creamier. She found herself getting aroused, then licking her lips, then wondering what was wrong with her. And yet, she couldn't help but stick out her big tongue and drag it across the right part of the glans, where the cheese was thinner. The gunk felt creamy on her tongue. It tasted very salty and a little bitter. She jacked him off while licking and a thin stream of precum started flowing from his urethra. As she retracted her tongue into her mouth and slowly rolled his smegma around in it to savour the taste, she pulled up her shirt, revealing her smooth, flat chest with bright reddish-pink nipples, erect from arousal. She then unbuttoned her pants and then pulled down both them and her wet underwear in one motion. She could see thin strands of her pussy-juice connected her pussy to the underwear. She took off the clothespin and inhaled deeply through her nose. The smell of his potent musk made her feel a bit light-headed. She took more shallow breaths as she ripped off a handful of smegma from his cock and put it the glob in her mouth. The top layer of the gunk felt dry and crumbly in her hand. The deeper layer felt softer, but still quite tough in her mouth. Beneath this was a softer creamy layer. She slowly chewed his nasty dick-cheese, savouring the aroma of the condensed filth of his boyhood while stroking her clitoris. After swallowing the wad, she wrapped her big lips around his still-dirty cock, covering most of the glans and ran her tongue around the head while jacking him off. She swallowed more creamy smegma, then started licking it off along with ample amounts of flowing precum. In a short amount of time, the surface of the glans was free of gunk. Now it was covered in a sheen of precum and saliva. His big glans was a very pale green colour. There was still a "collar" of cheese on the underside of his member. Her hand was soaked in her juices. She felt herself somewhat close to cumming. She was familiar enough with the male anatomy to know that boys shot a milky substance from their penises. She wondered how close Ed was as she wrapped her lips around his cock and moved them up and down. Her lips went down further than the glans. She took close to half the cock in her mouth. She started jacking him harder and jilling herself harder. None of this woke Ed up, not even when she squeezed one of his testicles. Her right hand gently slapped and groped his big nuts while her left stroked her pussy. She could feel them churning with semen, getting ready to release it. She felt the skin of the scrotum move and then saw it tighten around his plums. And then she felt the first blast of cum hit the roof of her mouth like a high-pressure fire-hose. She swallowed as much as she could, but the thick cum furiously spurting from his cock was filling her mouth much faster than she could swallow it. Her cheeks started inflating and very quickly she looked like she had a jawbreaker in each one. She didn't think her mouth could hold much more, so she pulled her head off it and a blast of his semen splashed on her forehead. She aimed the spewing cock lower and scooted backwards while still masturbating both herself and her brother. Fat ropes of very thick yellowish cum kept shooting out. One on her chin and the rest on her flat chest, completely covering it and running down the front of her body. She orgasmed as well, sprinkling her pussy juice on his balls.
When he was done cumming, Sarah started swallowing the cum stored in her cheeks in very small gulps. It tasted like gravy and felt very thick going down. She decided to have it all go down in one go. Her head round and huge, twice the size of a jawbreaker. She then swallowed the whole "sphere" of semen. The glob molded everything in its shape as it went down. It stopped in her stomach and her abdomen took on its shape. She now had a very big, round belly. She let out a burp. The cock-gravy felt very filling. She also wiped some cum off her chest with a finger and licked it off. Ed was still asleep. The frequency and manner of his snoring did not change since she started molesting him in his sleep.
She stood up and shook her big, bloated, cum-covered belly from side to side, then groped and shook it while starting to masturbate again. She loved feeling so full, loved feeling and hearing his thick spunk sloshing around in her tummy. She noticed her brother's pole was just as stiff as when she first started working on it. She wanted more. She knew, on some level, that his penis was supposed to go into her vagina, even though the only example of sexual intercourse she had seen was one instance of lions fucking during a documentary. She peeled back his cock again, revealing the ring of gunk under the head. She looked forward to having that filth coat the walls of her pussy. She was surprised by her own perverted wants for a split-second. The whole member was covered in a coat of its cum. She got up with some difficulty while holding her bloated abdomen. She raised up the cock and stood right above it as her pussy-juice and the cum he plastered on her dripped onto the slick mushroomhead. She lowered her tight little virgin pussy onto her sleeping brother's fat cock. The wet glans slowly parted and became enveloped by her vaginal lips. She felt quite a bit of pain, but that was washed away by an intense wave of pleasure as the cock filled her unexperienced girlhood. The glans was fully covered now and the smegma underneath it was being scraped on her vaginal walls as her cunny squeezed his cock in a vice-like grip. When it was half-way in, she let gravity do the work and allow her to swallow the rest of his cock. She had never in her life felt such intense sexual pleasure. Even before truly fucking herself or even taking the whole penis, she was already close to gushing. Her eyes rolled forward, her tongue hung limply out of her mouth and she let out a long and loud moan. Ed's cock and balls were already soaking wet with her vaginal lubricant and they were about to get much, much wetter. She started touching herself She barely flicked her bean twice before her floodgates opened, spraying her orgasmic fluid all over his crotch as well as further up and down his body. She sank down to take his entire length as she came, his leaky urethra "kissing" her cerivx. It was her strongest and most enjoyable orgasm yet. She screamed loud as she squirted. She no longer cared if that might wake him. Even if it did, she was still planning on riding her brother until she was cream-filled. Possibly with some admittedly PG-rated profanity spoken to him, as she was not well-versed in obscene language. Her whole body shook, the legs particularly so and she twitched while unbelievable pleasure washed over her. She spaced out in a beautiful, almost transcendental daze for more than a minute after cumming. When her mind returned to the material plane, she looked at her brother and was amazed to see him still sleeping and snoring the night away like nothing out of the ordinary was happening to him.
And then she started riding him. Slow at first, then faster and faster. Her bloated belly moved up and down and slammed against his with a wet "plap" noise. She felt his thick cum sloshing in it. It reminded her of the sounds it made when she drank lots of water, but the sound was "fuller". Smegma was spreading over the strained walls of her tight pussy, staining them a pale yellow. Her leaking pussy juice combined with the movement caused the gunk to flow downwards until it exited her. The slightly creamy yellowish-white fluid flowed out and covered most of his balls. She unbuttoned his shirt impatiently, eventually spreading it apart and ripping off his top button. She caressed his belly and chest and was even daring enough to pinch his nipples.
"Ooooooooh... Oh yeah! Oh! I'm bouncing on your big, hard, dirty peepee and you don't even know it, big brother. My kitty is gonna be as smelly as your nasty pole. And filled with its cream. Ooooooo.."
Another orgasm approached as she talked and commenced as soon as she finished. Dirty, smeggy pussy juice bathed his crotch and belly. At this point, his cock was almost clean of gunk. She only paused for a few seconds before resuming her bouncing. Her small but shapely butt slammed against his big balls, making both the buns and the plums jiggle. Suddenly, she felt the violent rush of Ed's semen hitting her cervix. Her pussy was almost instantly filled and the cum poured out of it. The spurts of cum exited his urethra with such fury that even her extremely tight cervix were not enough to stop them. Jizz blasted into her womb hard enough to hit the roof of it and coat it in off-white cream. He kept cumming and cumming, filling up her cervix past the point of fullness. Her uterus started inflating and with it, her abdomen. The rush of fluid into her, the fullness, the pressure... all of these things came together to give her an orgasm even more powerful than the first. A massive puddle of the siblings's combined fluids formed around Ed's balls and thighs and sank slowly into the sheets and matress. Her swollen abdomen now reached up to his chest. He finally stopped cumming after more than two minutes. From the chest down, Sarah resembled a baloon. She stood there for a few more minutes, enjoying the afterglow and caressing her belly.
She was considering getting off of him, when she felt a sudden warmth inside of her. She knew it couldn't have been cum as this was much warmer and she did nothing to help him ejaculate. It took her a few seconds to realize the shocking truth: He was pissing inside her pussy. Strangely enough, it was yet another unexpected kinky thing she found herself liking.
"Mmmmmmmnnn, naughty, naughty Ed... Using your own little sister like a urinal. So rude."
She knew what he did could not be called rude, since he had no awareness of it. But she found herself wishing he had. The idea of a boy uncaringly emptying his bladder into her after emptying his prostate, using her like his own personal cum and piss toilet was very arousing to her. She hoped her future boyfriend would do that to her. She never imagined liking and wanting most of the nasty activities she engaged until she did.
He drank a lot of soda before going to bed. Normally, this would not be happening. The last time he wet the bed was almost a year ago. Under regular circumstances, his bladder would not let a single drop of urine leave it and Ed would rush to the bathroom seconds after waking up. But her stimulation of his cock changed that. His cock was barely any softer since cumming. Sarah could feel the warmth inside her spreading. His piss-stream was also of high-pressure and entered her bloated womb, mixing with the cum he gave her.
"That's it, Ed. Let it aaaaaall out."
His pissing felt to her like a powerful and continous cumshot. Her already huge tummy started getting even bigger. Sarah started jilling herself off again. She had a bit of trouble reaching her vaginal folds with her huge gut in the way. She masturbated while Ed emptied his bladder in her until she orgasmed again. Steam from his hot urine was wafting around her. When he was done pissing, Sarah let loose her urine as well. "Why not?", she thought. She wished she could aim the stream higher up on his body and piss all over him. But her large mass would make that extrememy difficult. Right then, she decided she would do that the next night. She also wondered if she could piss in his mouth and wether or not he would drink it in his sleep. Only now did Ed's cock soften. Sarah tried lifting herself up , but her new weight made the task very difficult. So she instead pressed on her belly. This slowly squeezed out Ed's fluids from her womb until it was mostly empty. Now her belly was much smaller, Sarah having only his cum in her stomach. She stood up and carefull got off his bed. She was just about to pick up her clothes and return to her room when she instead decided to stay just a bit longer. She placed her nose above his naked crotch and sniffed deeply from the steamy stench. It made her light-headed, but she found the stink to be wonderful. There was still a puddle beneath his legs. She put her lips into it and slurped it up, then swallowed. She also licked his belly, his flaccid cock and his balls. Finally, she lay down next to him and gave him a long kiss on his right cheek while caressing his left one.
"Sweet dreams, boy-toy. I'll be back tommorow night." she whispered to him.
Ed woke up the next morning in a soaked bed, thinking he pissed himself in his sleep and having no idea what Sarah did to him. He also noticed he was sticky. This latter development was something he had more familiarity with. He experienced frequent wet dreams that he forgot when awaking. He believed his cum was just a different kind of urine that he only released at night. Sarah woke up having digested most of Ed's semen. She still had a small pot-belly. During the day, thoughts of further fucking herself using her sleeping brother filled her mind. She was planning on making it a regular occurence.