Alex rolled into his driveway and parked his street bike in the garage. He went inside and looked around for his sisters. It appeared he had the house to himself, a welcome change from the chaos he'd been experiencing. Upstairs in his room, he pulled out his secret shoebox, taking a few moments to admire Sam's red lace shorts and the twins' black and white panties before adding Megan's freshly saturated undies to his trophy case. Four pairs in one day, if he kept that pace up he'd need a bigger box.
The secret collection of panties reminded him of Lily's pink g-string. He'd caught a glimpse of the night before. It wasn't something he'd known her to wear, although it wasn't like she walked around the house half naked. In his weaker moments Alex had rifled through her panty drawer, and he often inspected what his sisters left in the hamper in their bathroom. Lily had a few lacy pairs that he might consider sexy, but they were all full-backed, he'd never seen a thong let alone a string in her drawer. She must be keeping secrets.
Alex walked across the hall and into Lily's room. Posters covered the walls and girly pink accents were draped on the windows and bed. His older sister was a neat freak, there was very little mess, just some recent clutter on her desk. Focus! He had a singular purpose and wasn't going to linger looking for her diary or other hidden treasures.
Lily's dresser was Alex's first target. He opened the top drawer where he knew she kept her underthings and rifled through the colorful assortment of bras and panties. White and pink were the dominant colors, mostly plain-styled cotton briefs and a few bikini and hipster cuts, but nothing close to resembling what he'd spied the night before.
Alex continued down the dresser drawers, but knew he wouldn't find anything; jeans, shorts blouses, and sweaters were all that was left. He moved on to the closet which was stuffed with hanging jackets and Lily's nicer clothes. The bottom was stacked with shoeboxes. Alex sifted through them, finding pair after pair of size sevens. On top in the very back, he found a large shoebox that was too heavy to hold its intended contents.
Alex opened the lid and stared in shock. An assortment of very naughty things filled the box. His eyes were first drawn to an anatomically correct rubber dildo; beige colored, about seven inches long, and thick, almost as thick as he was. It had a realistically shaped flared tip, colored pink, and veins that ran the full length of the shaft. Two little wrinkly silicone balls adorned the base, just above what he assumed was a flat round suction cup. His cock began to stiffen as he imagined what his sister must do with the toy. Maybe she used it in the shower. Or maybe Carrie used it on her.
Digging further, Alex found a few small plastic vibrators, one about five inches long and narrow, plus a couple smaller bullet-shaped devices with wires attached to separate control boxes. He opened a small velvet drawstring bag and found an inch and a half diameter butt plug with a pink heart-shaped jewel embedded in the bottom. He moved a box of condoms out of the way and examined a small collection of plastic squeeze bottles. A couple were plain lube, there was a bottle of cleaner, and he also found an assortment of scented oils and lotions, one of which was strawberry. He opened the lid and was immediately hit by Carrie's smell. He inhaled deeply and flashed back to the sight of her sipping his cum in ecstasy. He made a mental note of the brand and continued his search.
Alex found nothing else of interest, no sign of the secret pink g-string. He did his best to leave her room in the state he found it, but couldn't quite remember where he found the big box of toys. Oh well, maybe she'll forget, or blame Casey.
Alex was feeling frisky after the discovery of the origin of Carrie's alluring scent, not to mention the big rubber cock and butt plug he'd found in Lily's toybox. He needed to cool off and get his mind off girls in a serious way, especially his sister. Whatever Carrie had done to him on the couch had turned his sex drive up to eleven.
It was a hot summer afternoon, a perfect time to take a swim. Alex had to stay in shape if he hoped to keep up with his older and more experienced teammates once the season started in the fall.
Back in the master bedroom, Alex picked through his sizeable selection of swim trunks. After ten years of competitive swimming he'd collected quite a variety. More than one pair he'd outgrown, but kept for sentimental reasons. He pulled out a white speedo brief and smiled at it fondly. He won his first meet wearing it when he was thirteen. They're a little too small now, and rather threadbare, but what the hell. He slid off his shorts and boxers and pulled it on. The suit felt good; tight, like he was being held.
Alex stepped in front of the mirror to admire his form. His excitement was obvious, the form of his balls and spongy prick were quite conspicuous. He grabbed his shaft through the suit and pulled up to see how well the stretchy briefs could contain his package. No chance of slippage there at least. Alex then reached in and pushed his stiffening phallus down his front so his shaft rested across his balls. His flared tip pushed the suit farther out, stretching nearly to its limits. He'd have to be careful, the old speedo certainly wouldn't contain his full size.
Alex turned and looked over his shoulder into the mirror at his backside. The spandex hugged his ass tightly, he could just make out the start of his crack above the narrow waistband. He turned to the side and admired his bulge again. Impressive, he thought, as his cock twitched in delight. All the attention and complements he'd been receiving lately were feeding his vanity. It was a strange new feeling; he'd never considered himself particularly well-endowed. But apparently that was the case, he though, remembering Sam's and Fiona's shocked looks and words of astonishment.
Grabbing a towel, Alex marched downstairs and outside to the pool. He dove in and basked in the cool water. Beginning with a few warm-up laps, he quickly lost himself in the physical activity. All thoughts of the birthday party faded away as he picked up the pace, gliding through the water, his long arms propelling him faster and faster.
Casey had come home while Alex was changing, unbeknownst to him. As she passed his open door she was startled by the sight of her brother standing nearly naked in front of his mirror. She watched with fascination as he adjusted himself. Unable to see what he was doing, she was left with her imagination. Holding her breath, Casey admired his lean back and broad shoulders and stared agape at his sexy butt. The suit was so tight and worn through that she could clearly see the dark line of his cleft. When Alex started to turn around she stepped quickly out of the doorway and slid silently into her room, gasping for air.
Casey had only been this aroused one other time. It happened last fall when she and Alex were sunning beside the pool. He fell asleep next to her and she noticed in amazement that his tight swimsuit began to stretch. Alex's erection grew to full size in front of her eyes, so massive that it pushed the suit's fabric away from his hips. She could see a forest of dark crinkly hair through the growing gap. In a moment of sheer abandon, she quietly got up and crept in for a closer look.
From a foot away Casey could see the base of his thick shaft and the top of his wrinkled purse. He was so big! It made her quiver and tingle in places that rarely came to life. She stared for several minutes, and then quickly but quietly returned to her room. Hot and full of exciting feelings she mounted her biggest teddy bear and started humping it, still wearing her swimsuit. A few minutes later she experienced her first orgasm. She'd since graduated beyond stuffed animals as a means of release. Lily caught her doing it one day and laughed at her. Later she gave her a little metal toy, probably out of pity. Her older sister wasn't known for doing nice things these days.
Casey loved to rub that metal bullet around on her clit, the strong vibrations drove her wild. She also had a secret selection of candles of varying lengths and dimensions she used to probe her tight little hole when the mood struck her. But that rarely happened. She didn't like watching porn, and there weren't any boys she was interested in at school; they were all too immature or just plain gross. Sometimes she read erotic stories, but her interest in fiction wasn't strong. She'd never had a boyfriend, at least not a real one. It was always Alex that got her hot and bothered. She'd long since learned to accept her feelings for her brother and try to keep them to herself. He was oblivious to her sneaky glances anyway.
Casey contemplated a session of self-love, but the urge to see more of Alex overcame her desire for instant satisfaction. She had an idea, Sonya had given her a naughty present last week after school. It was a new leotard, but not just any leotard, it was a thong, probably meant to be worn over tights. Sonya wasn't known for her modesty, she simply said she'd outgrown it and thought Casey might like it. Casey didn't think she'd ever wear it, it was far from appropriate for public.
Feeling frisky, she pulled it from the back of her dresser drawer. The fabric was white, clingy, and very stretchy. It didn't have snaps in the crotch like her other body suits, it looked more like a swimsuit except there was no extra fabric sewn into the cups or crotch, and the back was very revealing. Below the waist there was little more than a triangle of fabric connected to a strip about an inch wide that lead up the backside. It was definitely not meant to be worn by itself, not decently anyway.
Casey quickly pulled off her clothes and stepped into the skimpy bodysuit. The fit was snug, she shivered as the suit pulled tight between her thighs, pinching her tingling sex. The suit was slightly transparent, the faint outlines of her nipples were visible, perched on her petite but prominent breasts. A dark crease ran between her legs just below a small patch of brown hair, all that remained of her short curlies.
Satisfied, Casey grabbed a towel and wrapped it around her exposed body. Lily was gone until dinner, so she had at least two hours to play with her brother. Excitement building, she bolted downstairs and out the back door to the patio. "Hi Alex," she shouted to get his attention.
"Hey, Case. Didn't hear you come home. Whatcha up to?" he asked while perched on the edge of the pool with his elbows.
"Do you mind if I practice on the lawn? I don't want to bug you, but I have a meet coming up and the gym is closed." It was a perfectly reasonable and innocent request. Except she couldn't seriously practice on the uneven ground in the backyard, but Alex didn't know that.
"Sure, knock yourself out." Alex sympathized, the inconvenience of having to go someplace else to practice was why he had the large pool put in last spring.
Casey unwrapped her towel and started warm-up stretches. Bending and flexing slowly and methodically, she tried her best to catch Alex's eye but he was in his own world, pacing back and forth in the water. She finished warming up and began practicing her tumbles, hoping her acrobatics would draw her brother's attention. Casey loved how the skimpy leotard felt as she moved. The pull of the thong between her legs sent a jolt of electricity through her body every time she straightened.