My sister, Nicole, and I are one year apart, though we have been in the same grade all our lives because I repeated Kindergarten because we moved around a bit when I was five. Because of this, and since our birthdays were only two days apart on the calendar, we began telling everyone that we were twins. Being in the same grade also had the added advantage that we were closer than I think most siblings are that aren't actually twins. We had many of the same teachers and friends. We did lots of things together, and even had double dates together (though that may be because I had my driver's license first).
When Nicole turned 18, we celebrated her big day by going out for dinner at her favorite restaurant. Even though it was my 19th birthday, the night was about her because it was her 18th, the day she became an adult. We'd have a bigger party on Saturday for all her friends, but Mom and Dad wanted to make sure they marked the day she became an adult with the family.
After we got home from dinner out for Nicole's 18th birthday, all I wanted to do was head to the den, pop in one of my parent's homemade sex tapes and jerk off fantasizing about my sister. But Nicole wanted to watch some TV with me, which I found out was simply an excuse to talk to me about her boyfriend's plan for them on Friday. Since Mom and Dad had retired to their bedroom and shut their door, which normally mean they were having sex, Nicole and I would be alone and free to talk alone upstairs in the Den on the other side of the house.
When we got upstairs, I turned the TV on and sat down on the couch. Nicole joined me. We didn't watch anything, she really wanted to talk. I was a little upset that I wasn't going to be able to sit and jerk off to my dad and sister fucking, but it was Nicole, and she really needed me, so I sat. As soon as I was seated Nicole blurted out that she had agree to let Tim, her boyfriend and my best friend, fuck her on their date on Friday night.
"I'm really nervous about Friday," she told me in a near whisper after she explained Tim's plans. "What if it turns out I'm horrible and he dumps me because of it?" She really was quite worried.
Tim's parent's were going to be away for the weekend at some business social in Tahoe, he was going to have the house all to himself. She said that the last time they went out, he had talked about having sex while his parents were away then presented her with a small ring and asked her to marry him. Of course, I was shocked that he hadn't told me anything about this, and for a few seconds I was a bit pissed he hadn't said anything. Then Nicole told me that she had said yes, and agreed to going over to his place and have sex with him.
"Trust me," I reassured her, "He'll be so happy that you're giving your pussy to him, he'll be in heaven."
She bit her lip and raised her eyebrows in a sign of hope. "You really think so?"
Unfortunately for her, she knew his reputation. He liked to fuck the hot chicks and then dump them a few fucks later. He was a real douche bag that way. I knew he was hot for her, and really wanted to make this a lasting thing, though. He'd told me he saw himself marrying her in a few years, after college. But he'd never told me that he was going to propose to her.
"Trust me, Sis," I told her. "He's really that into you. Having sex is just icing on the cake for him."
She smiled at that. Nicole has such a beautiful smile. I wanted to kiss her. I leaned into her and did just that. To my surprise, she let me and even kissed back. This encouraged me. I place my arm around her waist and slid my tongue into her mouth. She quickly sucked it up and leaned into me. I slid my other hand under her blouse and slid it up toward her breast. She grabbed my wrist and stopped my before my fingers reached the bottom of her bra.
"What are you doing?" she whispered to me.
"I really want you, Nicole," I replied. "I have for years."
Not only did I want to fuck my sister, I wanted to be the one to pop her cherry. I thought of it as my right and duty. At first I felt guilty about these feelings I had for her. But then I found something in my parent's collection of home videos that changed my mine. It was a swapping video of my parents. I had know they were swingers for a several years, but I think they thought us kids were ignorant of that fact. Perhaps the others were, but not me. But this one tape took me by total surprise.
I had found a tape late one night the previous summer of Mom and Dad swapping with another couple which was simply titled "Denise." I had a habit of waking up in the wee hours of the morning and rummaging through my dad's collection of porn, most of which was homemade videos of the two of them with a few very close friends. I loved watching them. When I put the tape in and settle back to watch, I couldn't believe my eyes.
The tape started with Mom laying across the top of the bed fingering her pussy, while Dad was naked sitting on the foot of the bed making out with another woman who was also naked. I assumed she was the wife of the missing man. Then the second man entered the picture, he was the one that started the recording. It was my uncle Rich, which meant that the woman Dad was my aunt Denise, Dad's sister! I sat mesmerized as I watched my dad fuck his sister and then leave her a nice creampie.
It was this video that came to mind while Nicole and I were talking about how wrong it was for the two of us to be behaving in this way toward each other. And it seemed like Nicole was trying to argue herself out of the situation. So I kissed her again and when she kissed back, I laid her back on the sofa. We kissed for several more minutes and my hand finally reached her beast. It was soft to the touch, silky smooth, but firm at the same time. It was slightly more than a handful, and her nipple was hard against my palm. I removed my arm from around her waist and began to unzip my pants. The thought of fucking my sister overrode my desire to see Dad and Aunt Denise fucking.
"No, wait," she said softly.
