Lauren was in her string bikini, the one dad fucking hated.
It was even better than I could have hoped. In her never-ending quest to reduce her tan lines to as near to nothing as was possible, without violating state law, she had even left the straps that went around her neck untied.
Lately, her plump tits always seemed on the verge of spilling out of her top, but now they were defying the laws of physics.
Even her bottom half was indecent, the back of her swimsuit left about an inch of ass crack bare. Again, she argued that it gave her the best tan lines, but I knew it was because she liked having the eyes of every guy at the lake on her.
It was distracting that every time she turned her upper body to dig in her paddle I caught a generous flash of sideboob. I knew it was wrong to notice these things about my sister, especially given that they were starting to turn me on, but she was impossible not to appreciate. It was even more challenging after half a summer at the lake, now that her skin had turned a to a burnished bronze and her curved lines had toned up slightly from all the hiking, paddling and swimming our parents encouraged us to do.
It was made worse by the fact that I currently hated the conceited little brat she had turned into. I hated any power she held over me and her tits were, quite frankly, an unfair advantage in our ongoing feud.
The island was close enough that you could swim to it from the shore, but it was around a bend and a good long stretch of paddling away from the lakeshore. Few people ventured this far away from the cabins, but we had been going there for years. First, as kids, pretending we were pirates, and the later to get away from our parents and whatever activities they had planned for us.
My sister and I fought a lot, often to the point where it got physical. She was a lot smaller than me, but that girl could throw a punch. When we were little I would even wrestle her just to torment her and to reminder who was stronger. I always won, I weighed nearly twice what she did, but more than once I was surprised by the compact power she had stored in that little frame.
"Are you sure they have booze?" She half turned as she spoke, showing me her profile.
"They said they had a bunch of it and wanted to party."
"Did you have to suggest the island?" I hadn't, but she did not need to know that. Not yet anyway.
"Can you think of another place we can drink and not risk getting caught by our parents?"
She mulled over this while we paddled in tandem against the slight wind chop on the lake surface.
"Yeah, okay. I just kind of always thought of it as our secret place, you know."
"Loli, I'm pretty sure other people know about the island. The lake is big, but not that big. Remember, we used to find old campfires there all the time?"
"I guess," I was surprised by her nostalgia. Lately, we had not been getting on at all. Honestly, she had turned into a real bitch since this holiday began and she had noticed that every guy within a hundred miles could not stop staring at her tits. From being my dorky little sister she suddenly seemed desperate to fit in. It was getting painful and she needed a lesson in humility.
She had been all sweetness and rainbows with me today though, when I had invited her for a secret drinking session with my buddies. She was always desperate to hang out with them, probably because she had a thing for Ryan. She always mooned over him when he hung out with me. It was so embarrassing, I can't tell you how much it annoyed me.
A short while later we gave a last spurt of effort and paddled the nose of the kayak up onto a beach of scrubby plants and shaly sand. I hauled it a little further up the beach, leaving the tail of it still floating in the water.
"Where are they?" She stretched out a crick in her lower back and I had to turn my head so I did not have to stare at her flat tummy and the way her breasts perked up towards the sky as she arched her back.
The piercing in her navel glinted tantalizingly in the sunlight, like a lure to a fish.
I had to remember my mission.
"I told them to meet us at the mermaid lagoon," I flushed a little when I saw her grin, adding, "I didn't tell them it was called that."
Many of the landmarks of the island had retained the names we had given them in our childhood, despite their now, apparently, laughable naivete.
She walked up the steep shore, with me following close behind her. Apart from the barely existent bikini, she wore only a pair of pink aqua shoes. As she climbed I was unable to stop myself admiring the sway of her hips and the jiggle of her buoyant backside. She had blossomed remarkably this year and it annoyed me considerably that all my friends had begun noticed too. Worst of all, I had begun to find myself agreeing with dad about her choice of slutty outfits.
Away from the water the sun seemed to bake down on us with increased ferocity. Insects whined loudly around us, occasionally forcing one of us to slap at a stinging bit of exposed flesh. I began to regret leaving my shirt back at the cabin. I could see the sweat beading on Lauren's lower back, making her flawless skin glisten in the bright summer light.
She turned back at one point and caught me staring full on at her ass, but her only response was a knowing smirk. It only increased my resolve for what was to come.
Annoyed, I pointedly ignored her as was walked inland. Mermaid lagoon was only a few hundred yards from our landing site, over the shoreline's escarpment and along a short, overgrown track and then down to a wide basin. It was not so much a lagoon as it was a large puddle.
Lauren stopped on the small rise from which the stagnant water was visible. Without turning she said, "I guess they aren't here yet, huh?"
"Nope," I replied as I drew up behind her.
The time had come to claim my revenge.
I took a moment to plan my next movements carefully while she took in the vista around us. I checked all the securing points and ran over my actions in my head.
I knew from experience that she was quick, so my timing had to be good.
Bracing myself, planting one foot a shoulder's width behind the other, I flicked out my hands. With each one I took hold of the ties on either side of her bikini bottoms and pulled sharply outwards.
The tiny garment seemed to melt off her body.
"Hey!" She squealed as her starkly white ass was revealed, the bottom half of her suit now clutched tightly in my hand. Her shock had been something I had been counting on. While she hesitated between trying to take back the suit and covering her sudden exposure, I grabbed at the string of her top and yanked that too. It came away with surprising ease.
"Chaz, what the fuck?!" Lauren spluttered as she half turned, incredulity inscribed on her face.
I caught a glimpse of her fattened tits, perfect in their orbicular regularity. Her pink nipples seemed dark against the untanned skin the surrounded them. I had little time to enjoy the sight, firstly because she was already moving to cover them up, and secondly because I was also turning, and launching into a run.
"Revenge, bitch!" I yelled back over my shoulder as I sprinted off back the way we had come.
To my surprise, I hadn't gone far before I heard her thrashing through the low brush behind me. Seeing her running naked would have been worth seeing, but I had to keep moving. She was faster than I remembered.
I leaped down the sandy hill that led to the little cove where our kayak rested in a few huge bounds. I threw Lauren's swimsuit into the front of the kayak and shoved it out. The oars were still stowed inside the boat, so all I had to do was climb aboard and I my getaway would be complete.
That was when I was hit by tackle any cornerback would have been proud of. A hundred pounds of naked woman-flesh knocked me off the kayak, just as I was putting my full weight on it.
Lauren and I went down in a spray of water.
I was still trying to rise to my feet, spitting out a mouthful of lake water, when she came at me again.
"Asshole!" She screamed, "What the fuck are you doing?"
The water was only up to our waists, so I caught a full view of her swaying bared breasts as she threw a fist at me. I might have blocked it if I were not so distracted. As it was the blow clipped me painfully on the ear.
Knowing how hard she could hit, I did what I always did when we had fought as kids, I moved in close.
A little discomforted by her bare skin, I wrapped my arms around her and pulled her into a hug before lifting her off her feet. She kicked and squirmed against me.
She was slippery with sweat and sunscreen. Her bare tits were flattened against me. I could feel her nipples, hardened by the cold of the water, poking my chest.
I tried to ignore it, but my body was starting to respond. She was strong and had already managed to wriggle her way half free, when I hip-checked her and sent her under the water again. I thought it would give me enough time to get the boat, but once again she surprised me.
I had barely turned when she came out of the water like an alligator, leaped onto my back and got a stranglehold on my neck. I could not shake her off, restricted as I was by the water.
"Why did you do that you that, perv? Did you want to see me naked?" She shouted in my ear through her pants of exertion.
"It's payback you little bitch. For what you did at the campfire."
"The campfire?" She clearly intended to sound outraged by whatever reason I gave, but I heard the realization dawning in her voice.
"Melanie was there, you fucked up everything!"
"Melanie Rogers?" Even in the heat of the struggle she sounded surprised.
"Yes, Melanie Rogers. And now her and all her friends and pretty much everyone at the lake has seen my dick because you thought it would make you cool if you pantsed your big brother."
"So you planned to leave me naked out here, marooned on an island? That's some fucking escalation, Charles" She did not sound pleased. At this reminder, and the feeling of her naked body coiled around mine, I felt my hardness increase. I willed it down, I could not be getting a hard-on for my little sister.
"You can swim to shore. We did it a million times as kids. But you'll have to do that, and the long walk of shame home through the entire camp, buck-naked."
"Maybe I would have, but you forgot that I ran track in high school. Now give me back my clothes, asshole."
"Too late," I laughed, pointing to where our kayak now spun lazily out from the island, picking up speed as a breeze ruffling the water caught it, "Your suit is in the boat."
I expected her to deflate at this realization, but she surprised me again. I felt her hold around me tighten and heard the vehemence in her voice as she growled, "Well then, if I am going to be humiliated, so are you."
"What? But you already..." My protest was cut off as she clambered, monkey-like up my back. She dug her toes into the crack of my ass and began to put her full weight down on my boardshorts.
"Hey," I yelled, "Quit it!"
"Fuck you, you little perv," She spat back through gritted teeth. She had a tight grip on me now and I could not throw her off.
