ROBBIE AND ROBIN I will be a senior at the University of Georgia this fall, and because I'm an only daughter, my parents let me take this summer (my last) off without having to work. I've been staying with them and simply relaxing. One weekend, my parents and another couple left for a four-day trip together and the couple asked me to take care of their fourteen year old twins. I was glad to do it since they have a big house in Dunwoody with a private pool. I knew the twins, and I knew they wouldn't be any trouble. What I didn't know was that they had grown up during the year I was away at school. Robert, or Robbie as he was called, was about six feet tall and weighed about 160 with a curly mop of blond hair that had been sunlightened that summer. He was on the basketball team, so he worked out with weights and was really a sexy guy, what with his broad, tanned shoulders, narrow, flat stomach, and tight, rounded ass. His sister was the exact opposite. Robin was only five feet two inches tall and probably didn't weigh 90 pounds. She had freckles and she wore her red hair in braids with a pig tale on each side. With her pug nose and diminutive stature, she looked to be only ten years old except for her breasts. They were the size of a half of grapefruit, and, as I later learned, were just a firm. On Saturday morning I took the car to get some groceries, but I came back in a few minutes to pick up the list that I had forgotten. On the way back to the car, I looked out at the pool deck, because that was where the kids were when I left. I couldn't believe what I saw! Robbie was lying on the patio table with a towel over his eyes and was spread-eagled with his swim trunks pulled down to his ankles. His cock was sticking straight up his stomach as Robin rubbed her hand up and down his thighs. Robin was topless, and her tits really did resemble grapefruit halves. They were completely rounded and had no sag whatsoever, and her nipples were a bright pink rose on the white flesh of her breasts. She picked up the suntan oil and poured some on Robbie's chest and began to massage it up and down toward his cock. She poured some oil on her tits and put Robbie's hand on her breast and, with her hand behind his, pressed his hand into her tender breasts. He began to rub it in as a bead of cum appeared on the head of his prick. Robin leaned over and, with the nipples of her breast, stroked his cock from head to balls, letting him feel her hardness on his sensitive skin. He was still blindfolded by the towel, and I moved closer to the screen door so I could hear them but not be seen. Robin was telling him to imagine that she was Cathy (me) and that I was going to beat him off. She described my body in detail (although she had never seen me nude) quite accurately and took Robbie's hands for a tour of her own body. I opened my jeans and slipped my hand down the front of my panties to my clit and pussy lips. I began to stroke my way to the inevitable climax while I watched Robin masturbate every part of Robbie's body except his cock. She poured some more oil, this time directly on his cock, and Robbie arched up from the table. She grasped his cock and began to rub one hand up and down his seven inch shaft while the palm of the other hand rubbed on the head of his cock. It was more than either Robbie or I could handle, and we came at about the same time. He was spurting all over his chest and stomach and I had to hold on to the curtain in order to stand up. Robin rubbed her tits across his chest and stomach, drenching her nipples in his cum, and then massaged it into her flesh. I recovered my composure before Robbie and was off to the supermarket, although with the germ of a plan in my mind. On the way home, I worked out my plan, and I stopped by Fredrick's of Hollywood and purchased a wet-look black string bikini. When I returned, both kids were in their swim gear, although it really didn't hide much, and I said hello and explained that I would be out after I put the groceries away. I went to my room and stripped in front of the full length mirror. I pulled the rubber band from my long, blond pony tail and let my hair hang down straight. I used a brush to get the kinks out, and the feel of the bristles against my sensitive nipples made them erect and hard. I put the new bikini around my waist and adjusted the bottom so that most of my ass was showing, and then put the bra on. It was only a strap which was about three inches wide, so it couldn't hold all of my breasts. About two inches of the tender, white underside of my tit was exposed along with about four inches of the tanned top of my breast. I put on high heeled sandals and practiced prancing and strutting. Robbie's eyes got wide when I strutted out on to the deck, and I knew that he could see some of my blond pussy hairs peeking out of the skimpy bottom, and he could now see the shape of all he had been told about while being jacked off. I kept my eyes on his crotch, and I know that he knew it. I went into the pool to make sure that the suit had an even wetter look and then lay down on the chaise. I carefully adjusted the strings, ostensibly to be demure, but really to make sure that both Robbie and Robin could see as much as possible. I asked Robin to rub some suntan lotion on me. She began, but I said (according to my plan) that she wasn't rubbing hard enough, and I asked Robbie to take over. His hands were trembling as he poured oil into his palms and began to stroke my thighs and stomach. Every time he came near my crotch, it was all I could do to not grab his hand and rub myself off. I took his hand and moved it to my stomach and guided it toward my breasts. His fingers grazed the soft skin on the underside of my tits, and I told him to make sure that he got them covered since they hadn't been exposed to the sun before. His fingers dug into my skin as he rubbed harder and harder, and my bra slipped up on my breast until the red circles around my nipples were exposed. His hand brushed my nipples and I pulled his hand under my top, letting my hard nipples poke into his palm. I was so hot that I had to find relief, and I pulled the crotch of my bikini bottom tight against my clit and began to hunch the material up and down. I climaxed and could feel the wetness dripping out of my pussy into the material of the bikini, and I reached over and stroked Robbie's cock. I quickly got up and guided him to the table and pulled his trunks down to his ankles, covering his eyes with a towel. I removed my top and began to repeat the same words as Robin had used earlier, but now it was a big, grown up Cathy in person. I used my hands and nipples on his cock, but when he began to squirt his cum, I placed my mouth over the end of his cock and drank his fluids. I suctioned as much cum as I could get and let my mouth draw up and down his shaft. I pulled off and walked to Robin, taking her in my arms and kissing her with my mouth and tongue. Since I hadn't swallowed all the delicious sperm, my tongue transferred some to her waiting mouth. I walked Robin to the table and took off her suit and removed my bottom. Sitting on the table, I pulled Robin next to me and told her to instruct Robbie in pleasing me. Without hesitation she instructed Robbie to lick my cunt and clit, and she used her own hand to spread my lips to give him access. She leaned over and began to suck and lick my nipples until I went over the edge for the third time that day. The only one still to cum was Robin, and I instructed Robbie to eat his sister just as he had done to me. Her freckled face contorted and she began pinching her own nipples as she felt his tongue for the first time. When she finally came, her body went into spasms that lasted for at least a minute and came in waves so that she was in continuous climax for what seemed to be five minutes. I instructed the kids that we should be nude or provocatively dressed for the rest of the weekend, and that we would masturbate and eat each other as often as we desired. Later that night, I shaved each of our pubes, making both Robbie and Robin look like they were only ten or eleven years old, and exposing my lips and clit for each of them to see. I fucked Robbie that night, and the next day I took him up my ass (only after a liberal dose of K-Y jelly), the first and only time I have done that. Since Robin was licking my clit while he was fucking my ass, I got off even through the pain. I might try it again if the circumstances were right, but only if the guy's cock was thin enough that it wouldn't kill me. Robin learned how to suck cock, starting from the time Robbie had just cum, through the flacid, quiet state, until he was again aroused and hard. She couldn't quite take all of it, and she was disappointed that he didn't have any cum for her to taste. I told her to wait, that she would have plenty of chance later. I've gotten together with the kids a couple of times since then, but it hasn't been as exciting as that first, teasing time when I fucked both brother and sister. Guess I'll have to find some twins at school this fall.