Chapter 1

Cyndi had been driving me crazy all week. My younger sister, I had to admit, was one of the sexiest women I had ever known, and she wasn't modest about showing off her sexiness. She also wasn't very modest about showing off her body, which was incredible. Cyndi's tits were large and smoothly formed, some of the nicest tits I could imagine. And there wasn't a time I could recall when I'd seen Cyndi's breasts without firm, erect nipples. She was always turned on it seemed. I'd had plenty of time to see Cyndi's nipples lately. Our parents were out of town for two weeks and Cyndi was taking advantage of her new freedom to be as immodest as possible. She pranced through the house with the skimpiest clothes possible, often just a T-shirt and panties, or one of her delightful little bikinis. Her boyfriend Rod had been spending nights over here. Cyndi and Rod shared my parents' bedroom and I didn't have any doubts about what went on in there. As a matter of fact, more than a few times I had watched them when they left the curtains open at night. My parents' window was plainly visible from the balcony of my room, something I'd found out only recently, but something that gave me lots of entertainment since I'd come home for the summer. Now that my parents were away, I had to admit I much preferred watching my little sister. Those two were the kinkiest couple I'd seen in a long time. They even rivaled me and Megan, though Megan and I did have a pretty wild time of it.

I called Cyndi my "little" sister, but I'm not quite sure why. She was only a year younger than me, eleven months, as a matter of fact and not a whole lot smaller. Her tits certainly weren't "little" at all, and neither where those big sexy blue eyes--Mom's eyes. But Cyndi's sex drive was the biggest thing all about her. My little sister was the horniest slut I'd ever known, even hornier than her big brother!

I had left home to go to college just last September when Cyndi was a senior in high school and a virgin as far as I could tell. But since I'd come back for the summer, I'd come to realize that my little sister wasn't anything like a virgin, nowadays. On the contrary, she was a much-fucked tramp! Not that I objected, especially since I could see through her window. And Cyndi wasn't just a normal slut. She was kinky! She liked it all ways, and some of them were quite enticing.

I'd watched Cyndi get it up the ass several times since our parents left. Rod seemed to love giving it to her that way and whenever they did it, the moans would have kept me awake even if I hadn't been watching. She also liked it doggy-style. I'd watched Rod fuck Cyndi from behind more often than they'd done it face-to-face and that was quite often, to be sure. Cyndi also liked having Rod come on her face and her tits. She went wild with desire, rubbing the thick jizz all over her nipples and lips and covering her cheeks with it. She also really got into dressing up for him in leather and high heels most of the time, and once she'd even worn a dog-collar, just for effect, since they weren't into bondage. And Cyndi wasn't just kinky with Rod. She liked cheating, as well--she'd already had three other guys up to my parent's room, and not just individually. Get this--she'd had two guys up there at one time! I didn't wonder what they did in there! I knew! Naturally, I had watched. At least, as much as I could. Steve and Al had gone up there together one night when Rod was working late--supposedly just to drink. But before long Cyndi was drunk and the two guys had her clothes off and were fucking her from both ends. Steve put his cock up Cyndi's ass and Al entered her through her cunt--while Cyndi went crazy with pleasure! I could hear her moans and screams of ecstasy all the way downstairs--so I was duty-bound to watch her! I chuckled to myself as she went at it with them, giving them head, letting both of them eat her out, sharing her tits between them, the whole bit. If I'd had any doubts as to what a willing young vixen my little sister was, I gave them up that night. The sight of two cocks pounding into her had convinced me!

She'd also had Rod's friend Doug up in my parent's room, but she didn't try to hide that fact. Doug didn't have to drink with Cyndi to get her into bed. Cyndi came on to him, and before long they were fucking doggy-style. Cyndi really knew how to seduce a man, and Mom hadn't raised her to let her talents go to waste.

Mostly, though, Cyndi fucked Rod. Every night, and usually in the afternoons. They liked to use the hot tub and the sauna, and sometimes the shower which joined our two rooms. In that big house, there were plenty of places to fuck, and they didn't try to hide what they were doing. I'd stumbled upon them fucking in the window seat which overlooked the pool, in the garden, in the attic... they were a swing couple. And Cyndi wasn't just kinky with Rod. She was plenty kinky on her own. After all, she had only met Rod a month ago, and she had several months before that to try out her newfound lack of virginity. She kept a little diary of her lovers, which I'd peeked in to once or twice. I felt like a sneak thief, but my little sister fascinated me so much I just couldn't keep myself away!

And Cyndi's room was a veritable treasure chest of pleasure.

Cyndi liked dildos--I'd found an assortment of them, all enormous, under her pillow. Along with a cache of skin mags, both men and women. They were all very explicit, showing everything. More of the magazines had women in them. I guessed that Cyndi was bi. The thought of Cyndi looking over those magazines and playing with herself till she came was almost too much for me. It made my cock throb to fuck her. And Cyndi also had a vibrator, nice big one with ten speeds. It plugged into the wall socket, so she wouldn't have to worry about running out of batteries when she most needed her fuck. She hid the vibrator in her top drawer, buried under her sexiest underwear. Cyndi's panties and bras simply made her drool. She had tight, lacy panties that hid absolutely nothing, and tight demi-bras with under-wire that pushed her tits up and together, accenting her tits deliciously. Even more interesting were her garter belts and fishnet stockings, which she wore when she was really going out to get fucked. I'd seen all these things on Cyndi, when I spied on her as she dressed. But more often when she showed them off, bounding through the house with her cavalier attitude about nudity.

My parents were very liberal and didn't try to hide their kids' bodies from each other--but Cyndi was ridiculous! I didn't doubt for a second that she was something of an exhibitionist--it was plain from the way she reacted that she enjoyed showing off her body to her big brother. Cyndi's favorite sleeping attire was panties and a tank top--sometimes an oversized dress shirt--and she always made it a point to come out and say goodnight to me, with her arms at her sides so I could admire her tits and legs. And of course she always gave me a goodnight kiss.

Cyndi and I were very close--we always had been. I didn't mind if she wanted to prance around the house with no clothes on. I was more than willing to help her satisfy her exhibitionist urges by watching her. But I wasn't about to come on to my own sister!

Of course, Cyndi and I were very physical. She hugged everyone a lot, but especially me. And she always told me everything--well, almost everything. When she'd finally lost her virginity, she had called me up at college and talked to me about it, describing the whole thing in intimate detail. Complete with a description of her giving head. It made me so hot that I jerked off immediately after hanging up. Cyndi must have known what kind of an effect she had on me. When she kissed me with those pert lips of hers--a chaste sisterly kiss, to be sure, I felt a surge of hormones go through my body and before long my cock would be standing on edge. We always trade gossip and stories--and hers were invariably sexual. Cyndi never ceased to astonish me with her horniness, or with what a slut she could be!

But then again, she always did outrageous things. And I got the biggest surprise of my life the day that Rod left to visit his own sister for a weekend. Mom and Dad would be gone for another week, so Rod had taken off from his busy schedule of boning Cyndi to go out of town.

Cyndi was spending the day out by the pool, stretched out in one of her incredibly tiny bikinis. The thing was so revealing that Cyndi might as well have been nude, though if she was, I might not have been able to control myself! She lay on a towel by the pool lawn with her legs slightly spread and her arms lifted so that her tits stretched nicely through the bikini. I was out on the deck, which overlooked the pool. Cyndi didn't know I was watching her, but I wasn't exactly hiding. Cyndi's body was so incredible that I just couldn't keep my eyes off of her and that bikini didn't hurt! The top came low into her cleavage and was very skimpy on the sides, so that the smooth, curved sides of her breasts were plainly visible and quite admirable. The bikini bottoms were tight and french-cut, tucked high up between the cheeks of her ass. Her buttocks were the most gorgeous I had ever seen. Cyndi's ass was nicer than that of any girls I'd ever fucked, even at college. Megan had a nice ass, to be sure, and it looked incredibly sexy curved around my cock when we fucked doggy style like Rod and Cyndi, but there was something special about my sister's ass, something incredibly enticing. Maybe she just liked to show off, even more than Megan, which was difficult. Megan wasn't quite the exhibitionist Cyndi was, but I'd seen both girls naked more than enough to know that neither one was very shy when it came to their bodies--especially their asses!

One of the things that turned me on most about Cyndi's ass was that I'd never fucked Megan that way. I had been going out with Megan for six months now, and she was just not in to anal sex. I wanted her to try it--the girls I'd fucked like that had all loved it, but Meg kept refusing. Now Cyndi... she was a lot kinkier than that.

Cyndi came in periodically to get a glass of lemonade or something. Every time she got up, I moved into the living room, where Dad's expensive stereo was playing, and lay down on the couch with a magazine. I didn't want to make it too obvious that I was watching Cyndi. After all, I had some morals to uphold here. When Cyndi got up, I slid into the living room and quickly put The Who on the record player. I reclined on the plush couch and picked up one of Cyndi's Cosmopolitans. I breezed through it until I found a perfume ad with a sexy woman in her underwear. No wonder Cyndi was always so horny!

Cyndi came into the room, smiling and holding a glass of lemonade. "What's up, brother?" she asked flirtatiously.

"Not much," I smiled back, making sure my gaze didn't linger too long on her body. Now that she was up close, she looked even better. The outline of each nipple was plainly visible through the bikini. "Trying to hide from the summer heat," I added.

"Why would you want to do that?" she asked. "It's gorgeous out there!"

"Uh-huh," I agreed, glancing at her.

"Would you like something to drink, Ian?"

"Hm... what's the sudden burst of charity?"

Cyndi rolled her eyes. "God! I'm just being friendly!"

"All right," I laughed. "I'd love something. How about an iced tea?"

"With lemon?"

"Sure."

Cyndi walked out of the room, and I got a delightful view of her ass as she did. When she came back in, she was smiling again. She set down the tea and sat on the side of the couch, right next to me. So that her gorgeous, smooth midriff was right next to my face. I inhaled her perfume deeply--the perfume she wore always turned me on. I could even smell it over the magazine.

Cyndi stretched a little, rubbing her side. It drove me crazy when she did that. "I'm getting so horny," she giggled, "I can't believe Rod's going to be gone for another three days!"