Not Fat Anymore by Musclehead Katie had grown up unhappy. In a school where football was not king, but soccer was the more popular sport, her twin brother, Keith, was somewhat of a big man on campus. He was not the star of the team, but he was handsome though relatively slightly built. His sarcastic wit made him pretty popular, but unfortunately for Katie, she was all too often the target of his sharp tongue. Whereas Keith was lean, Katie was overweight, not grossly obese, but a good thirty pounds too heavy. She had a pretty face, a female version of his handsome one, but that's where their similarities ended. When all his friends were around, especially the guys, they were relentless in their teasing, often leaving Katie in tears. That was then, this is now. After 2 years in college, Keith had done a lot of partying, and his physical activities were a distant memory. He had not seen Katie two years, at least during summer vacation. She had won a summer scholarship to go to Australia, of all places after her freshman year. They only saw each other at Christmas, but she avoided him as much as possible, and she went around the house pretty well covered up. Now was the summer after sophomore year, Katie had come home twenty pounds lighter. Actually, she had lost thirty pounds of fat and gained ten pounds of muscle. That summer in Australia had turned her life around. Contact with the free spirited women down under really opened her eyes to what she could be instead of what she was. One girl showed her a website that showed lots of girls who had been fat, had started exercising and eating better and how they looked like totally different people in a relatively short time. And now Katie was the living embodiment of the proverbial ugly duckling becoming a beautiful swan, actually a beautiful hot swan. She had gone from dumpy, low self-esteem teenager to a beach girl hardbody in just over a year. But during the transition she had kept herself covered up, and needless to say, she didn't have self-esteem issues any more. Only her mom knew how Katie had transformed herself. She didn't want to reveal the new her until she was completely ready. And now she was ready. In the past, Keith should have been the supportive twin brother, but all too often he had been the instigator of the sometimes cruel comments made at her expense. So now, she would reveal her new body a little at a time. Yes, he was her brother, but wouldn't it be sweet revenge if she could lead him on to the point where when he finally saw her beautiful new physique in all its glory, he would be embarrassed and humiliated by how much his own sister turned him on. Katie didn't have a lot of obvious muscle except when she was exerting herself. Yes, she was extremely fit and firm, and her arms and legs were definitely fuller, larger than other girls her size. Her stomach was flat and hard but the only guys who had actually seen abs was when she when she was breathing hard and straining and tensing her torso in mid-orgasm. And even though she didn't show a lot of muscle, it was obvious how fit she was if not how strong she might be. And Katie was strong, really strong, as Keith would find out soon enough. Her first night home, she wore loose sweatpants and a big baggy sweatshirt. You could tell that she had lost some weight, but it was hard to tell how much. Everything was sort of nondescript, except those tits, those amazing tits. Actually, the larger breasts that she had had when she was fat had gone away when she got lean, so she got some implants, and they were glorious to go along with the rest of her glorious body. She had found that they were still extremely sensitive, and she had also found that any guy who was critical of them quickly changed his mind after a nice tit-fucking. Another thing that went along with getting fit and strong was that her awareness of her own sexuality had gone through the roof, and the wild Australian women had taught her to be free and unashamed of it. A few weeks after getting home, Katie was going to go out to see an old girlfriend, and when she came into the kitchen with tight jeans and an equally tight long-sleeved shirt, Keith nearly dropped his beer. The next day, she still wore her baggy sweatshirt, but had one some really short cutoffs so that her twin brother could how shapely her legs were, bigger than his. And that round firm ass was enough to cause him to get a bit of a chubb. Every time she quickly looked at him, she caught him staring at her great lower body. Time to up the ante. Saturday was nice and hot and both twins were off from their summer jobs. Mom had gone off to see a friend, (Dad had been gone from the scene since they were little kids). Keith was already out by the pool when Katie came out to join him. She was wearing a long robe and Keith was pretending to ignore her, but in reality he was sneaking constant glances her way. When she took the robe off, he tried to stifle a gasp, but she heard him. Her modest bikini covered all of those perfect round cheeks, and covered most of her boobs. But you could still tell that those parts of her body that were covered were just as magnificent as the parts that weren't. She turned around to face her brother. "Keith, did you just say something?" "Nnnooo." "I thought I heard something." "No, I was just gonna say that you've done a pretty good job losing all that weight." As he spoke, he moved the magazine he had been looking at down by his crotch, trying to be subtle, but it was obvious to Katie what he was doing. She had seen it before. "I didn't just lose weight, I got fit. Fitter than you are." "Whatever." Usual sarcastic Keith. A few minutes later he got up and left. Katie smirked to herself as she gracefully dove into the pool, assuming that she had gotten to him and he was going inside to jerk off thinking about his own sister's great body. "Tomorrow will be the day," she thought to herself. On Sunday, she was in the kitchen with those same cutoffs and a tanktop on when Keith wandered in. Since it was hot and they hadn't yet turn on the air conditioning, Keith was wearing very similar clothes. The differences in their fitness levels would be glaring to an impartial observer. Katie decided to start pushing some buttons. "Hey Keith, you know, yesterday you gave me your usual sarcastic reaction when I mentioned that I was in better shape than you. Well, looking at you and me in the same outfits, don't you think it's kind of obvious?" "Whatever. Who gives a shit." "Well, I figured you respond kind of like that." She paused for a second, looking him up and down, totally confident in her physical superiority. "Jeeze, what did you do in college, nothing but partying?" "And studying." "Well, you just seem so pathetic to me." "You're starting to piss me off." "It's not very attractive seeing a body as skinny as yours and with a little paunch. I guess you're not getting many girls looking like that. Why don't we just do something to prove who's fitter?" "Go fuck yourself. Why should I put up with this shit?" She knew she was getting to him. A confrontation was inevitable. Just push him a little farther. "I'll bet I'm stronger than you, too." "That's ridiculous. I'm a guy, you're a girl and I'm bigger than you." "You're not only pathetically out of shape but you're stupid. I thought you said you studied in college. By the way, you're taller than me, but I'll bet we're pretty close in weight, if not me having a bit of an edge." She turned and walked out of the kitchen, heading out to the pool. Keith was so pissed off that he followed not too far behind, not sure what he was going to do when he got there. In the back of his mind was the image from a few days earlier. They had to move some stones from the front yard out to the back. It was not lost on him that she had an easier time of it and continued to finish the job after he had pooped out. But now she had directly confronted him and he had to do something about it. "What makes you think you're stronger? You lost some weight and did some aerobics, big deal. I'm a guy, I'm stronger." "I was able to move rocks for over an hour yesterday. You stopped after, what, fifteen minutes. Pathetic." "My knee started hurting. Old soccer injury. I'm sure my upper body strength is way better than yours." "Good excuse." As she talked, she was taking off her shorts. He turned away from her, taking off his shirt and shorts, setting them on the chair as she continued to talk. "Why don't we do some pullups over there on the pergola?" "You're on, bitch." He turned around to face her. There was nothing modest about the bikini that Katie had on today. In the back, more than half her beautiful glutes showed. She knew that when a chick has a round, firm ass that sometimes showing half of it is more impressive than showing it all with a thong, kind of like the effect a pair of tight booty shorts has on a great ass. She turned around and stood with her hands on her hips in a confrontational manner, thrusting those great tits out, tits that were barely cover, just two tiny triangles. God, she looked hot. Keith was instantly hard in spite of himself. It was quite noticeable. "Hahaha, you can't do pullups when all your blood is in your shorts." Her mocking infuriated him and he charged at her, knocking her to the ground as he climbed on top of her. She quickly swung into action and within a matter of seconds, he was lying face down and she was sitting on his bony ass. "Wow, that was easy. I'm not just stronger than you, I'm a lot stronger." She grabbed his arms and pulled them behind his back and then up in a double chicken-wing. He was so weak compared to her that she was able to hold them in place with her left hand. Leaning forward, she wrapped her right arm around his neck, but from the left side of his head and around the front and to the right, so his face was under the back of her arm. Sitting back up, she maneuvered him into a reverse headlock, pulling back hard. She was able to let go with her left hand since his arms were caught between his back and her abs, which were visible now as she poured on the pressure. Too bad he couldn't see them. Leaning back even farther, Katie wrapped her powerful legs around Keith's mid-section as she continued to sit on his rear. Keith started kicking his legs wildly due to the pain, so she reached back with her free hand and grabbed an ankle, torqueing the leg into an unnatural position. Holding on and applying constant pressure to every part of her debilitating hold, Keith was finally reduced from cries of pain to a whimper. When she was sure she could hear him, Katie spoke softly into his ear. "Things will be different now. I'm so much stronger than you that I can do anything I want to you at any time and you'll be totally powerless to stop me. Now, I have a question for you, and you better answer me honestly. After you saw my awesome body in a swim suit yesterday, did you go inside and beat off to images of your own sister and her physical perfection?" He mumbled into the back of her arm, but she could tell that he was denying doing it. Pouring on the pressure, she again had him screaming. When he stopped, she asked him again. This time the totally whopped guy admitted it. Laughing, she released her holds and Keith flopped to the ground. Turning him over, she sat on his stomach and stared down at him. "That's for all the tormenting you and your friends did to me all those years because I was fat." She was more pumped up now than she had been before and he could see obvious, though not ripped, muscle definition. He could also tell that she was turned on from how easily she had destroyed him. Scooting up his body she planted her crotch on his face, pulled her bottoms to the side and shoved her pussy into his mouth. "Lick it good or I'll suffocate you." She rode him to several wonderful orgasms and then abruptly got up off him. As he lay there crying softly she warned him not to tell anyone, "...as if you would, that your own sister handled you like you were a small child. I've got plans for all of your friends who teased me over the years, and if you spoil my revenge, I'll put you in the hospital. Paybacks are hell. By the way, anytime I want my pussy licked, you're going to do it, voluntarily or by force. If I force you, it reinforces how much stronger I am than you, which really turns me on, and if you do it voluntarily, it shows that you're totally afraid of me and have now become my bitch. That gets me going too. By the way, I like getting my pussy serviced just about every day, sometimes more than once."