Fun with Sis, Later Years Labor Day weekend didn't go as I had hoped it might, but it was a start. my brother-in-law Reggie, my sister Karen, wife Donna and I shared their hot-tub one mild evening at twilight. I insured that Reggie and I were on either side of Donna. Her modest one piece suit made the onerous task slightly moreso. I initiated horseplay that resulted in Donna's top becoming less secure and slowly sliding down. She naturally responded by hiking it up each time. Finally I "accidentally" caused her top to slide down well below her left breast, exposing it and her nipple to Reggie's startled but appreciative gaze. I had really fixed Donna as she had difficulty recovering her composure and top. She was understandably upset and I apologized profusely. But the stage was set. Karen and Reggie were gracious about Donna's unplanned tit- flash and passed it off stating it was no big deal. In fact they went so far as to reveal that they often skinny-dipped in their hot-tub alone and occasionally with close friends. They indicated it would be OK if we would like to take off our swim suits, it was no big deal either way to them. I wasn't too keen at first, but on reconsidering, decided I would go first. My rationale was that it was no big deal to my brother-in-law; my sister was just that and had seen me in the buff whenever we had sex together before and certainly knew what I had, and dear Donna saw it all of the time! My sister Karen joined me by initially popping her bikini top and then her bottom, after all I had previously seen all she had, so had Reggie, and poor Donna was a woman just like Karen! Reggie was initially hesitant because Donna hadn't responded but finally slid off his suit anyway. I said that since we were all so close it wouldn't matter one way or the other because we were all in the water, it was now dark and we could only see by moonlight anyway. The three of us has placed our swimsuits on the adjacent deck surface as evidence we'd really removed them. As a final resort I "dared" Donna to remove her suit, remembering that she was stubborn about backing away from a dare. True to her stubborn streak, she coyly slipped off her swimsuit halfway, attempting to cover her tits with her left forearm and struggling to remove the rest of it with her right hand. Finally she passed the point of no return and couldn't cover her tits and her pussy simultaneously and just relaxed and let her arms drop as she joined us in the altogether. In the moonlight we could basically only see outlines anyway. I got a couple of good looks at Karen's tits and one of her pussy again, she saw to that. Reggie got at least several good look at Donna's tits and a brief glimpse of her pussy before we all grabbed towels, dried off and changed to dry clothes. Karen and I let up on our sexual relations after she married Reggie, which was understandably fair enough. It has been a good 15-16 years since we've screwed. I'm fairly sure Reggie has been kept unaware of the fact. Anyway, during their Thanksgiving trip to the Bay Area I broached the subject with Karen about the possibility of our fucking again "sometime," possibly in their hot tub. I mentioned that things were slowing down with Donna and me. She said the same was happening with Reggie. She didn't mind our screwing again. "It would be nice to feel you deep inside me again" was her initial reply. "I'm not really sure how Reggie would feel about it," she added. I told her Reggie needn't necessarily know. "Let me think about it," was her immediate reply. Several weeks passed and I got a phone call one Sunday afternoon just before Christmas. It was Karen telling me that she would be agreeable to it. We flew to Denver for the Christmas - New Year holidays. The holiday rush, preparations and parties had kept us out of the hot- tub until the night before New Years Eve. To recuperate from the Christmas whirl and get ready for the New Years Eve party I conned Donna into the hot- tub again. She cautioned me "no funny stuff!" I promised. We sipped on a nice German Gluhwein and relaxed for half an hour before Karen was able to join us. Donna was starting to feel mellow. Karen had apparently not bothered to put on a swimsuit top and was there in essentially a monokini or topless suit. Wow! She stated that it was her one real topless swimsuit she bought in Hawaii and saved for special occasions. She said she couldn't very well get sunburned after sundown. "Do you mind if I bathe topless?" Karen asked Donna. Donna replied, "not really, if Bill doesn't." I kiddingly replied that I wouldn't look, besides the only thing less worse than kissing your sister was seeing her half-naked. Reggie was tied up with some unexpected holiday business and wouldn't be able to join us for at least another two hours. In the meantime I plied both women with more Gluhwein and we talked and cavorted in the tub. Unbeknownst to us, Karen had playfully and partially unsnapped one side of her topless suit bottom underwater giving me clear access to her marvelous pussy. She had only intended this action as a prick-teasing ploy as she came over to me and sat on my lap face-to-face, but my cock didn't know any better and acted on natural instinct and homed in on her hot, wet pussy. Karen was literally and figuratively "taken" by surprise when I quickly worked my stone hard cock out of the leg opening of my suit, swiftly, silently, forcefully and fully slipped it up Karen's wide open ready-cunt, right in front of my unsuspecting wife. Brother and sister were just having a personal talk, only my cock was doing all of the talking and Karen's vagina was doing all of the listening. While she hadn't bargained for quite so much action, Karen turned good sport, let out a surprised gasp and resigned herself into letting me get into her fully and finish fucking her in short order. It was sort of a flash fuck. It was over before it started. Karen let out an Ahhhh! when she felt my warm come paint her cervix. Donna asked what we were up to. We replied, "just communicating." I eased out of Karen and made it clear I still had my swimsuit on. Karen then ceremoniously unsnapped the rest of her monokini and slapped it on the deck stating she wanted to get more comfortable. I followed with mine. Thanks several more batches of the warm mulled wine Donna felt comfortable about removing her swimsuit in front of Karen and me. We all fooled around and mutually engaged in some rather heavy petting for another half- hour. Unexpectedly, in retribution for her stolen fuck, Karen was openly aggressive and came over to me, turned around and straddled my lap with her back to me. She coyly announced "well, well what have we here?" as she grabbed my now revived diamondcutter cock and rubbed against her pussy lips before she sat on it hard and made it disappear once again. She whispered loudly "paybacks are hell big bro! "Donna gasped at what she just saw. "Why Karen, you just slipped Bill's cock into you, well, I never...!" Karen replied "It's totally OK, Bill is my dear brother and it's OK for brothers and sisters to screw if they want to, it's OK with me, is it OK with you Bill?" I stammered out a "Uh, well, under the circumstances, since my cock is already in you and you are my only and dearest sister, and because you don't mind, I guess it's OK with me." Karen told Donna to relax. As previously, Karen's cunt felt tight and marvelous, but she didn't stay coupled very long, what she did was for shock effect and to set Donna up. Donna stared on, numb in shock and disbelief. She repeated herself, "But you just let your own brother stick his penis in you, you're not supposed to be able to do that!" Karen taunted Donna with "You'd better use Bill's cock or lose it." Donna got real, saw the light, and obliged by sitting on my dick the same way and really letting me fuck her from behind. After I came in Donna, Karen wanted more and offered her ass and cunt in the air from the edge of the hot tub. I obliged by ramming her. Not to be outdone Donna came alongside Karen and stuck her ass and pussy in the air likewise. I changed from Donna to Karen and back every 100 strokes or so, after a steady 15-20 minutes of hard, deep stroking a beautiful, sensuous feeling was building up in my cock. It was now impossible to hold off my orgasm one second longer and I started squirting my load in Karen and finished in Donna. Some double header. For the rest of our visit Karen dressed in much more casual, sensual attire like jeans and a vest with little else, and just plain jeans, shorts or pedal pushers indoors. I was especially fascinated with the short cut-off jeans and wide suspenders she decided to wear early one morning to tease my prick. Although she intended them to, the wide suspenders weren't enough to hide her nipples. As she moved, her nipples and aureole kept poking to one side of the suspender strap or the other. I got hornier by the peek, which were many! Karen and I started a progressive game of indoor "fucking golf" in the house one morning. She was virtually topless in the jeans and suspenders outfit. Wherever and whenever we met in the house I would slip my cock in her for twenty to forty strokes. Our grab-ass game started spontaneously in their basement when I initially caught Karen near her station wagon and nailed her from behind bending her over the warm hood. She had an impression of the Ford logo on one of her titties. A few minutes later I trapped her near her washer as she bent to sort a pile of dirty clothes to wash. She propped herself against the washer and commented "that's nice, but you only get twenty strokes (more or less, always more!) per hole at one time today or I'll never get anything done." Luckily, Donna is a very late sleeper and it was only 7:30 am when we started. I next caught Karen doggie-style as she was going back upstairs to the kitchen, then over the master bedroom toilet as she tried to clean it, a few minutes later we coupled standing up face-to-face in front of a towel closet, on the kitchen counter when she tried to cook breakfast, then on one end of the kitchen table after breakfast. We then progressed to Karen's unmade bed before she made it, then she held on to her upright vacuum cleaner as I jacked into her doggie-style again while she was vacuuming the rug. She then startled me by saying "OK Bill, we're only going to play nine holes this morning and we've already played eight, the hardest and longest hole in coming up. She stepped into the sauna-shower portion of the master bedroom and filled the tub with warm water as we slipped out of our shorts and started groping at each other with our hands and tongues. We finished in a wet wild bubble bath with Karen holding on to the edge of the tub for dear life as I lifted her out of the water with each stroke. I caught Karen by surprise when I pulled out of her cunt and went for her asshole. I only stuck my cock in her an inch or so with an "oops, sand trap" as I pulled out, washed it off and re-entered her for my final strokes. "Damn, Bill, that's wild, why did you stop it?" I pumped on and told her that we'd try that some other time, right now I just wanted to come in her and fill her innards with sperm. Seconds later I convulsed deep inside her and surprisingly very little ran out. Karen remarked that I must have really stuck it in there for so little to come out. We finished up the morning's romp by taking a nice warm touchy-feely shower. I cheated and took a twenty stroke penalty when I porked Karen in the shower up against the tile wall too. Later Donna wondered why Karen and I took a long noontime nap. Several nights later we shared the sauna tub together after Donna retired for the evening. I had a tube of KY jelly handy and butt-fucked Karen nearly into delirium. Afterwards she decided that it was better to have me stick my cock in her mouth and cunt, as her ass was more than a little sore. She said she felt like there was still a telephone pole up her ass several hours later. Cunt-fucking provided her much more sensory pleasure. I told her I'd be only to happy to oblige.