Caution: This Incest Sex Story contains strong sexual content, including Consensual, Reluctant, Incest, Brother, Sister, First, Oral Sex, Masturbation, Exhibitionism, Voyeurism, .

Desc: Incest Sex Story: Brian realizes he's jealous over his own sister.

I had always been close to my sister Sandra ... or rather "Sandy" as she preferred being called these days. With only two years difference between us, it had never seemed an obstacle for either one of us. She knew my friends ... and I was well acquainted with hers. One in particular.

We both still lived at home in order to cut down on expenses while I attended a local university, the same one that Sandy had begun attending as well a few months after graduating high school. Along with her best friend Diane, who I was currently seeing, and had been dating now for several months. The odd part was, most of the time, our dates consisted of the three of us going out together. Like I said, I'd always gotten along well with my sister, so having her come along with us seemed quite natural as opposed to her being a third wheel. We had double dated on a few occasions, but Sandy didn't really have any guy special at the moment, so lately it seemed like she was far more content to just tag along with us. Admittedly, it put a cramp in my love-life to some extent, but Diane and I had managed to fit in some intimate personal time for ourselves here and there. Though whenever we did, or made it obvious we needed some alone time, Sandy's mood and demeanor would noticeably change during those times.

Sandy and Diane were similar in appearance too. Very often people would take them for sisters, not quite twins ... but they looked, and dressed alike a good deal of the time. I found myself quite frequently enjoying the curious looks we got as the three of us strolled about the stores, or sat in the movie together, a beautiful girl sitting to either side of me. Each of them had dark brown well past the shoulder length hair, green eyes, full sensual lips, and though I couldn't prove it exactly, pretty much the same figure and bust size. Like I said ... they looked so much alike, I'd even gotten a bit of teasing from my buddies because of it. Saying I had some sort of a twisted sister fantasy, which is why I was dating Diane in the first place. I too had a full head of dark hair, and more like hazel eyes as opposed to being green like my sister and moms were. I was also a couple of inches taller than both, just under six feet give or take an inch. I enjoyed playing tennis, and though I didn't have a regular regimen or workout routine, I did take pretty good care of myself. I didn't consider myself a hunk, not by any means, but I'd never had any real problems dating cute, or attractive looking girls all through high school, and then into college either. Still ... the thought that my friends found it odd that I was dating someone who looked a lot like my own sister, or that I might be a bit twisted in doing that, gave me pause on more than one occasion. Especially as I had secretly thought about my sister in times past. But that was years ago. About the time Sandy started looking like a true beauty, a true beauty with tits, which is about the time most guys first look at their sisters a little differently. I know I did. And so yeah, I spent a few nights secretly fantasizing about my own sister. But eventually I grew out of that. That ... or forced those thoughts away whenever I found myself absentmindedly entertaining them. After all, that was incest. And thinking about one's own sister was pretty twisted and sick in a way ... wasn't it? So I didn't much care to hear my best buddies saying it or thinking it either. Though maybe to them, seeing the three of us always hanging out together would seem to be a bit sick and perverted in some ways.

I had no idea at the time just how twisted and perverted things were about to become.

I normally worked after school at the university bookstore and library part time. I had as usual showed up prepared to work when Jerry, one of the guys I sometimes worked with had showed up as well. I'd forgotten. Having traded shifts with him a few weeks back so he could have a particular night off, he'd agreed to come in and work for me one night. Remembering, and now delighted, I quickly headed off towards home, glad now for an entire weekend, especially as our parents had left early that morning for a drive up to San Francisco to spend some time with my Aunt as she'd recently had surgery. Nothing serious, but enough so, she was laid up and in need of some additional help. That would leave the place to us for the entire weekend, and that also meant, I might in fact be able to convince Diane to spend the night with me at least once. It had been well over two weeks since we'd had a chance to be together, and frankly ... I was damn fucking horny!

Although I shouldn't have been too surprised to see Diane's car sitting in the driveway, I hadn't expected to see her of course until sometime Saturday. Obviously she'd come over to visit with Sandy, and maybe..."just maybe" I thought smiling to myself, be waiting for me in bed when I supposedly got off work that evening. I figured we'd have to play nice for a bit, especially with my sister around. But I also knew that Diane was much like me in respect to getting a bit cranky if we didn't fool around some, or go too long between having sex. Something else I loved about her, she could be a real animal ... a real dirty, naughty animal in bed once she was aroused. And I needed some animal loving tonight in the worst way too!

With Diane's car in the drive, I was forced to park my own car out in front. Usually I entered in through the back door, but with the closer proximity of the front door now facing me, I entered that way instead. And though my room was upstairs, Sandy's room was downstairs, the far larger of the two. The moment I stepped inside I could hear voices, a bit of laughter, and knew that the two of them were obviously downstairs in her room. I sat my backpack down on the floor next to the couch in the sitting room and started to head over towards the stairs leading down to her room and the den area. Which is when I heard something else, a whole lot different than laughter, almost like a deep guttural moan. There was no mistaking it either. It was the sounds of someone enjoying a nice little orgasm, no question about it.

"What the fuck?" I thought silently to myself, and then deciding to remain silent, I quickly slipped off my shoes, now taking the stairs as quietly as I could in stocking feet. Obviously they weren't expecting me home, not for a few more hours as yet. And as mom and dad were certainly away, they had no reason to suspect anyone would come stumbling in on them. The problem was ... this was my girl friend ... and sister I could hear fooling around together. Even as I slowly descended the stairs, I had mixed emotions regarding what I might soon discover. On the one hand, this was every man's fantasy wasn't it? Two girls ... enjoying one another in the most intimate of ways? And yet ... on the other, this was my sister who was one of them ... with MY girlfriend! Even though Diane had been Sandy's best friend long before we'd ever started dating. Which then raised the question, "How long has this been going on anyway?"

I continued to creep down the stairs as quietly as I could, still listening to the sounds of heavy breathing and moaning, only now ... I realized it was coming from the den, and not from her bedroom. Reaching the small landing, off to the right down a short hallway was my sister's room, another full bathroom, and the laundry room. To the left, the family den. I now saw the flicker of light coming from the TV as I turned left and approached the doorway. It was open, as they'd obviously saw no need to close it. I slid up along the wall before daring to peek in, knowing where the TV was, and knowing they'd be on one of two couches, and perhaps both. But I also knew, if they were indeed watching something on TV, they wouldn't notice me standing behind them. And if they were doing something else other than that, they wouldn't be worried about me yet either. I felt relatively safe as I eased my head around the corner peeking into the room.

What they were doing was watching a porn movie together, though where they had gotten it from I had no idea. The moans and groans I'd been hearing coming from that, and not them, or at least not all of them anyway, though the obvious laughter had been ... nervous excited laughter perhaps. On screen as I stood there back behind the door in the darkness, I could see two women and one man, actively engaged in stimulating one another. At the moment, the two girls knelt before the guy sharing his cock, sucking and licking it together. But as interesting as that might have been to watch any other time, what I now found myself actually looking at had garnered my entire attention. And I knew I must have been standing there with my mouth open when I did.

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