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Author's note: This is a work of fiction. All characters are eighteen years or older. Anal sex is a major theme in this story, so you might want to consider reading something else if you're not into that sort of stuff. Don't expect realism and you won't be disappointed when you don't find it! Enjoy! ***** As the last traces of his afterglow faded away, Tyler slumped back against the pillow and exhaled deeply. Lying on one side of him on the bed was his laptop, which he had already shut off, while on the other was the towel he had just used to clean up his cum-covered abdomen and his big, still chubby boner. "I should probably wash this thing..." Tyler groaned to himself as he folded the spunk-soaked cloth and put it back in the lowest drawer of his nightstand. It could still be useful for a couple more times, or once at least, Tyler reasoned, knowing full well that he would jack off again later. But until then, he had more pressing matters to attend to. As if on cue, his sister's silvery voice rang out from outside, calling Tyler back from his musings and making him turn toward the window to gaze down into the backyard. "Tyler! Come on, Ty! I need you to do my back!" As always, the mere sight of his little sister brought a peaceful smile to Tyler's lips and filled him with a sense of quiet joy that nothing and nobody could ever quite match. Still, that wasn't his only reaction. Tiny and curvy and effortlessly beautiful, wearing nothing but a skimpy blue bikini under the scorching afternoon sun, Michelle was walking barefoot across the deck and alongside the pool. Her long light brown hair was pulled up in a ponytail that swished side to side with her every graceful movement as she headed to the recliners placed in the shade of the patio. Michelle's bikini showcased her voluptuous albeit petite figure magnificently, and Tyler was immediately so enthralled by his sister's undeniable sexiness that his breathing accelerated while his freshly milked cock already started stiffening with renewed arousal. As it had been the case for months, Tyler's gaze couldn't help but stray from Michelle's super cute face and roam lower, pausing briefly to admire the generous fullness of her large bikini-clad boobs only to then proceed swiftly lower down her curvy silhouette until his eyes reached their favorite target: his sister's fantastic bubble-butt. It was roundest, plumpest, most beautiful ass imaginable, protruding magnificently from Michelle's back and jiggling mouth-wateringly with her every step. It was the ass of a goddess, the dream booty of every hot-blooded rump lover. Ample and curvaceous, Michelle's buttcheeks were clearly no match for the flimsy material of her bikini thong, whose strings enhanced the majestic fullness of her juicy globes by biting into her swaying hips while the deep, luscious crack of her ass swallowed the light triangle of cloth meant to 'cover' her big butt in the sexiest possible manner. Just the image of that flawless heart-shaped booty suggested a feel of pillowy smoothness and meaty softness to the touch, while its persistent wiggling and shaking undulations irresistibly beckoned the onlooker to move closer to it, or at the very least to stare at it really hard. As he drank in the stunning perfection of his little sister's glorious bubble-butt for the umpteenth time, Tyler couldn't help but feel flushed and dizzy and horny all over again, even though he had just jerked off. He truly loved that luscious ass, almost as much as he loved the girl it belonged to. He had dreamed of that juicy booty every night and masturbated to mental images of it every day for months now, busting massive loads every time, just like he had done mere moments before. Even though his sister's beautiful ass was Tyler's hottest, wettest and most unachievable dream, he didn't really feel guilt about it somehow, since he considered his adoration for Michelle's callipygian rump as on of the many aspects of his deep-seated, genuine love for her. Besides, Tyler didn't seriously hope to make his forbidden butt-centric fantasies come true: just being near that masterpiece among asses all the time was enough for him. Well, kind of... Tyler's eyes were still avidly drinking in the bouncy roundness of Michelle's booty when she suddenly turned around to look over her shoulder, gazing right up toward his window. As soon as her bright green eyes met his, the corners of Michelle's gorgeous lips turned up in a beaming smile and she raised a hand to wave at her big brother while holding up a bottle of sunscreen lotion with the other. "Ty, come on down! I'll get sunburned if you don't help me out here... Please, Ty, hurry! My big butt really needs you!" Michelle yelled at him, giggling as she sat on a recliner and lay down on her side, accentuating the curve of her spectacular rump, meanwhile patting the cushion beside her, inviting Tyler to join her. Eagerly nodding and smiling back at his sister, Tyler shook himself off his momentary ass-staring trance and jumped to his feet. Within moments, he kicked off his bunched up pants and boxers, put on a pair of swimming trunks and dashed out of his room as fast as possible, heading downstairs to be with Michelle. ***** As far back as either of them could remember, Tyler and Michelle had always been very close. Beside being brother and sister and fairly close in age, they genuinely liked each other from the get go and enjoyed one another's company, which, as they learned much to their surprise while growing up, wasn't necessarily the case among all siblings. Then again, not all siblings went through the kind of stuff that Michelle and Tyler had to face growing up. The death of their father when they were toddlers was certainly a big factor in bringing Tyler and Michelle closer, as was the fact that they spent a lot of time together when they were little kids while their mother Ellie was at work and had to leave them with a babysitter. An even bigger element in the consolidation of their sibling bond was the fact that, when Tyler was eight and Michelle was seven, he got an extremely serious case of pneumonia that almost cost him his life. Sick, pale and on the verge of death for weeks, Tyler didn't really retain much of that nightmarish childhood experience, except for the unique sense of comfort given him by the constant presence of Michelle at his bedside. Terrified to lose her big brother, Michelle tried to stay with Tyler as much as she was allowed to all through his illness, and even later on, once he was finally out of the woods and back home on his way to complete recovery, she barely left him for a moment. Potentially tragic as that event had been, it was a positive turning point in Tyler and Michelle's young lives. It was then that Tyler started getting interested in sports and fitness and being as healthy as possible, and it was at that time that he started to get into swimming, which would soon grow to be one of his greatest passions. In truth, Tyler didn't gravitate toward sports just because he wanted to get strong and never feel weak and helpless in the future: mostly, he focused on improving his health because he didn't want to see Michelle worry about him ever again. Tyler had been truly touched by the inconsolable despair he had noticed in his sweet little sis's face when she thought he was going to die, and he hated the idea that he had caused her that sort of pain. More than ever before, Tyler was positively stunned by the sense of joy and warmth radiating from each one of Michelle's frequent hugs and he rejoiced in the constant beaming smiles she gifted him. Seeing his sister so glad to have him by her side made Tyler happier than anything in the world, giving him a clear sense of how important he was to Michelle and confirming how crucial a role she had in his life. Because of that, Tyler swore to himself that he would never do anything that might hurt Michelle or make her sad or worried, ever. For her part, if during her big brother's sickness Michelle had been terrified by the thought of losing him, she came out of that horrible experience with a newborn fascination for the mysterious inner workings of the human body, which translated into a fascination for medicine, biology and science in general. Egged on by those new interests and by the natural curiosity of her bright mind, Michelle became a straight A's student, achieving particularly great scholastic results in any class relating to science. Of course, because Tyler had spent the better part of a school year either in the hospital with pneumonia or at home recovering, he ended up being held back. Still, even that academic setback turned out to be a blessing in disguise, as it meant that from that moment on Tyler and Michelle would be in the same classes. That helped a lot during their adolescence, which they spent moving very frequently from city to city because of their mother's work. Switching schools and losing friends all the time wasn't exactly fun for Tyler and Michelle, but neither of them ever blamed their mom for it. They knew how much she loved them and how hard she had always worked to provide for them, giving up on most aspects of her personal life to focus only on her career and on being with the two of them whenever she could. Never putting down roots wasn't too much of a problem for Tyler and Michelle though, because they always had each other. In fact, over the years, while their mother steadily climbed the corporate ladder in her company and they kept moving from place to place all over the country, the bond between Michelle and Tyler kept growing stronger and more multifaceted. Puberty was a weird time, of course, but the siblings rode it out together by joking and chatting and always being there for each other, which allowed them to navigate the changes they were going through with relative ease. Still, by the time their senior year in high school rolled around, with Michelle being eighteen and Tyler nineteen, the undercurrent of new sensations flowing back and forth between them underneath the surface of