In my 50s and never married, I had finally spent the money to buy a small trailer on a small lake about an hour north of my place about a year ago. Some friends had recommended it and it was a good deal. I spent the first year just enjoying the lake, making more friends, and wandering to the parties that broke out along the waterfront every weekend. But the deck, built out from the trailer to the dock, needed cleaning to make it respectable. So, I had taken a week off work to go do a little relaxing and work my ass off on the place so it wouldn't eat up the weekends for the rest of the Summer.

It had been a warm, wet Spring but the weekends had been sunny and dry, a crowd had been out to get their places opened up for the season, and everybody had done a good job of getting their drink on. I had called my sister Jill to tell her what I was doing and invite her out.

She had gone through a bad divorce a while back, had been taken to the cleaners by her ex, and worried me by not bouncing back like I thought she would. But she hadn't shown up.

Monday didn't even dawn. The rain had set back in, a fog had rolled over the lake, and the campground was deserted. But the power-washer I had rented was a daily charge and I had never used one without getting soaking wet anyway. So I was out in old sneakers and my white cotton shorts blasting away at the deck -- no sense in soaking more clothes than needed. Totally absorbed in what I was doing and believing I was the only thing around with a pulse besides fish and frogs, I nearly jumped out of my shoes when I heard a piercing wolf whistle.

"I don't know why you fucking bothered with the shorts." It was Jill! "There's nothing to wonder about your skinny pink ass in those things." Bag over her shoulder, she stood there, pale red hair, an inch or two shorter than me, white T-shirt with her massive boobs pushing more out of it the wetter it got, broad hips, tight ass in khaki shorts, and long, muscular legs right down to her small, wide feet in her canvas sneakers. She was a critical care nurse and I've never known her to be out of shape.

She apologized for not making it for the weekend, but had drawn a couple extra shifts so she could take the week off like me. Cool!

"Get your shit inside before we have to go to the laundromat to dry it out," I told her. We never minced any words. "And bring a couple beers out. It's time for a break."

I stepped under the awning I had, did my best to dry my hands and lit a cigarette as I waited. When she stepped back out with the beers, despite being my sister, she made my chub twitch. She had changed into a sheer cotton blouse, unbuttoned and tied up under those breasts, and pink cotton panties. As the rain hit her, her nipples poked right out of her blouse.

"Well, we don't want to have to go dry anything," she told me wryly, having seen me staring at her. She handed me my beer and we just chatted until we drained them. "What do you want me to do?"

"Keep the furniture moving out of the way as I clean sections." And she worked like a dog, sliding everything around. When she had a moment, she'd run inside and bring back a beer to feed me a sip as I kept working.

Pushing furniture around, her blouse had soon come untied and I saw her bare breasts swaying through the open front. Before long she threw if off all together and worked topless.

As I finished up, I paused to watch her peel her panties down and step out of them. My hard-on was raging against my cotton shorts. Totally naked, she placed the last of the furniture back in it's place and disappeared into the trailer.

As I shut down the power washer and rolled the hose up, I wrestled with the realization that I wanted to fuck my sister. Did she want to?

Could I do it?

She took the answer out of my hands as I felt her tits press into my back and her hands slip around my waist and into my shorts to wrap around my shaft. My shorts fell to the deck and I stepped out of them as I turned to her. She grabbed my ass cheeks with each hand and pulled me into to her. She planted a hungry kiss on me as our hands raced up and down each others bodies.

"So here we are," she said as we broke our kiss and the statement just hung in the air as we stared at one another. She knelt down and took my cock in her mouth, one hand stroking the shaft and the other fondling my balls. Looking up, she locked eyes with me as if she was seeking approval. As if my cock wasn't already saying "yes", my eyes were. I was staring into my sister's eyes as her mouth did its damnedest on my cock.

She was soon sucking my balls and I was about to explode, but she wouldn't let me cum, until she was ready. Her hand racing up and down my shaft, she would squeeze it off every time she felt it building. The cool rain continued to wash over and run down our bodies and I was becoming desperate. Finally, taking my cock back in her mouth, she let me erupt. My whole body spasmed and my knees buckled. She tried to take it all but it was several massive shots, with the excess shooting across her face and tits. Sitting back on her heels with a look of satisfaction for a job well done, she let the rain rinse the cum off her face and across her tits.

"So here we are," I parroted back to her as I caught my breath and slid into a deck chair. Jill laughed loudly as she rose up and went into the trailer. The taboo was broken and, for now, we could just enjoy each other. I had to look down to see if my cock was steaming.

She came back with two more beers and a rolled up towel. She led me under the awning to chair, gave me a beer and revealed a dry pack of cigarettes in the towel. I lit one and took a heavy drag. As we drank and chatted, she perched on the end of the table where I had a clear view of her clean-shaven pussy.

Soon, it was my turn. Before kneeling down, I laid her back and pulled her ass to the edge of the table. She perched her heels on my shoulders then let them slide down my back. As I buried my face in my sister's pussy, I knew I couldn't match her oral prowess but I did my best -- licking like a mad man, driving my tongue as deep as I could, and working her with my fingers while I sucked and nibbled at her clit. Gawd, she tasted good! We should have been doing this since puberty. Jill began writhing under me and the world went silent as she clamped my head between her thighs. I more felt her cry out than heard it as I got a faceful of her cum. As she relaxed her legs, I raised up to look at her across her flat belly.

"Christ! You look like a glazed donut," she laughed as she propped up on her elbows, catching her breath. It was my turn to get the beer.

As I returned, the rain felt really good on my body. Handing her a beer, I noticed she had lit a cigarette for herself, so I must have done okay by her. I lit one of my own and settled back into my deck chair. As she pulled her legs up to lounge on her side across the table, it would have been hard not to take notice of just how sexy she was. My cock was starting to revive.

The rain was picking up again and was fairly making the wooden awning above us roar. The lake was almost white with the rain splashes and we just gazed out at it in silence as the rain pounded on.

After several minutes, she swung her legs off the table, stepped to me, and bent down to kiss me. "I've never fucked in the rain," she told me just loud enough to be heard over the rain. "Come fuck me in the rain." And she led me out into the rain and down to dock. I stepped around and turned to face her before I lay down on my back.

Jill stepped straddle of my hips and squatted down to my cock. Balancing with one hand on my chest, she used the other to guide me into her and slid down to my balls. Rocking forward onto her knees, I could feel the cool of her wet thighs against my side.

"Ohhh, I feel you growing inside of me," she moaned as she slowly rocked on me. Soon, she had worked into a full buck and I was enthralled as she arched her back against the dark sky, thrusting those tits out, the rain splashing off of them as they bounced and running down her body. I reached up, massaging her tits, and felt her pussy starting clamp down around my cock. Ready to cum myself, I reached over her thighs, grabbed ass in both hands and pulled her down on me hard. She hunched forward, pinned my shoulders to the dock with her hands as she fell forward, holding herself on her arms. I felt her pussy clamp down hard as she began a quaking orgasm. My stomach tightened, my ass flexed, and my cock exploded inside of her, which drove her even higher. I heard her scream echo across the lake.

She fell across my chest as we both panted raggedly. Catching our collective breath, she wrapped her arms under my neck and head, and we kissed passionately. As the rain poured across our bodies, I wrapped my arms around her, could feel the warmth of her body against me, the intense heat of her pussy still spasming on my cock, and the warmth of our spooge running out of her and around my balls. We lay like that for several minutes, until Jill flinched at a crack of thunder over us and we both agreed we should head inside.

Once we dried off, we headed straight to bed and fucked the night away. The next three days brought no relief from the rain. We noticed the rhythm of the rain on the roof, but we were busy. We tried everything -- every position, every place in the trailer, play with food, even some anal. When we would take a break, we snuggled on the couch or bed to watch an old movie. We only barely dressed to run into town for food and drink.

The weekend brought clear skies and sunshine. As the weekend crowd rolled in, Jill became the hostess of all time. There were always people on the deck with drinks always flowing. The men were there to watch Jill, always in a bikini or tight tank-top/no bra and cut-offs. The women were there to watch their men, but they were good sports about it and Jill soon earned their friendship. She has become a regular at the lake, keeping her work schedule to free up the weekends. The sex is as good as ever and no one is any the wiser that we're siblings. We're just another couple at the lake.