After that glorious night with my mother, my sexual confidence had grown tremendously. I was now set on getting my older sister Kate to join in on our family fun. The task seemed difficult since she was going out with Scott Sellers, one of the college jocks. But despite him being three years older than me, I was already taller and far more muscular than him. I reckoned that if my sister liked big muscles, I was in with a chance. I also knew that my sexual endowments were far superior to Scott's. I had seen his puny, shriveled penis in the gym shower one day, and he looked to be barely three inches long soft. By comparison, I was already sporting a ten-inch limp schlong that had given me a school-wide reputation of being " hung like a horse ». In the shower, other boys, including seniors, would just gaze jealously at my genitals while I soaped the long tube of flesh, rubbing around the rim of my circumcized knob with both hands. I would often get semi-erect, in order to emphasize the difference in size between my foot-long, half-tumescent, mega-cock and the other boys's tiny two or three inches long noodle- dicks. I would then heft my bulging ballsack with one hand and carefully clean my lemon-sized balls in clear view of everyone else. Nobody could fail to see the immense proportions of my seedmakers as they hung low in a huge ballsack several inches below the root of my fat shaft.
My sister Kate had recently turned twenty and I had offered her a bunch of twenty magnificent red roses for her birthday. She was really moved by my gift and had told me that Scott, her boyfriend at the time, had never had such a thought for her. She had then caressed my bulging upper arms and had commented on how hugely muscular I had become. She also said I was real cute and that she was very proud to have me as her little brother, eventhough I certainly didn't look little! At eighteen, I towered over her by more than ten inches. She would often rub my chiseled chest and hard, massive pecs through my T- shirt when talking to me. I decided on a strategy to entice her even further. At every occasion, I would ask her how much bigger my muscles felt compared to her boyfriend's and try and turn the conversation to sexual topics. She would often laugh and scold for being so bold, since she was my sister and she didn't think it was appropriate for siblings to be discussing such matters. But at the same time, I could tell she was becoming more and more aroused by the massive bulge that was constantly tenting my trousers or shorts. She had, of course, mo idea about the many fuck marathons I had with our mother when she was away visiting friends. My mother had strictly forbidden me to talk about our incestual relationship, and she was not amused either by my recent interest in my sister's charms. But she always came back for more once I dropped my shorts and exposed my fifteen and a half inch dripping cock. She was a cumslut for my cock and she knew it. I just had to turn my sister into a similar cumslut and I would live the rest of my college years happily fucking my lovely mother and sister whenever I felt the urge...
Summer was approaching and our family's activities migrated from the lounge to the backyard. We were lucky enough to have a swimming pool in the garden, hidden from our nosy neighbours' view. It was to become the stage for my seduction of Kate. I thought that two half-naked people were more inclined to find sexual attraction, especially with my ten-inch limp cock stretching my custom-made speedos obscenely and her bikini thong leaving nothing to the imagination.
I had just finished 50 laps and decided to lie down in one of the longchairs when my sister Kate joined me, carrying a jug of lemonade and two glasses. She was wearing her skimpiest two-piece swimsuit. The yellow thong barely covered her crotch, and when she turned round to pour me a lemonade, my cock twitched at the sight of her amazingly tight buttcheeks, so round and deliciously tanned. Not only did Kate have a stunning body, she was also the cutest girl at college. She has long natural blond hair which she likes to arrange in a ponytail, giving her a disconcerting look of innocence. Like my mother, she has deep blue eyes with eyelashes that won't quit. Her nose is small and pointy, and her high cheekbones give her a definite classy look. To top it off, she has sensuous lips only rivaled by my mum. She has also grown past the stage of freckles and the skin of her whole body is absolutely flawless and perfectly tanned.
She grabbed a glass of lemonade and, as she bent forward to hand and it to me, I enjoyed the sight of her heavy, firm knockers barely covered by two minuscule triangular patches of yellow spandex. My cock jerked until the head was threatening to bore a hole at the side of my right hip. I must have been semi-erect by then and a foot-long cock doesn't like tight confinements. Despite the fact that I was wearing speedos with a quadruple-size pouch (my mother had insisted on such custom-made underwears, saying that my huge cum-filled eggs needed breathing space. My boxer shorts are also XXL with a triple-size fitting in the middle so that the massive size of my balls doesn't break all the buttons apart), there just wasn't enough fabric to cover my extending tool. Of course, Kate saw my state of arousal immediately and gasped suddenly.
" Oh, Timmy, you naughty brother! I can see that you have big muscles ALL over! » , she said, her eyes fixated on my surging knob. It was now pushing the waistband aside and the oozing tip of my cockhead appeared, sneaking its way up my six-pack abdomen. I knew the decent thing to do would have been to cover my erection and apologise to my sister, but the excitement of the situation, combined with the lust-filled eyes of Kate devouring my throbbing stallion-sized prick, left me breathless. I just sat there, as my rod slowly rose towards my chest.
" Timmy, how can you do that? This is gross! I'm your sister, and you might be hung like horse but we just can't do that! » , she exclaimed as her hands tried to cover her crotch and breast areas, realizing they were obviously responsible for the engorging state of my manmeat.
" Oh, come on, Sis! It's no big deal. I saw you eyeing the lump in my speedos several times! », I retorted, now gently pulling on my fattening rod with one hand.
" Well, it is huge, but I can't! You're my brother and anyway, I have a boyfriend! », she snapped back. However, she had removed her covering hands and was now just standing in front of me, gently rubbing her thighs against each other and giving me a look of disbelief.
" I bet he doesn't have a cock half as big as mine. Right, Sis? »
" Well, no. Actually, he's kinda small down there. I sure would prefer him to be as well-hung as you are, Timmy. » She bit her upper lips as her left hand went down to her crotch and started rubbing her thong against her clit in small circles.
" I sure could use some help in getting my cock out! What's wrong, Sis? Don't you want to see of all it? Don't you want to see how big my nuts are? », I teased her as I jacked off the ten or eleven inches of my cock that were jutting out of my speedos. She hesisated, but I saw her slowly giving up. She waived her hair back and kneeled to one side of my longchair.
