My sister, Lori, is 8 years older than me. Its her, our 2 brothers, and then me.
Lori always tried to be our 2nd mom - she was always very bossy and tried to make rules for us. I was never real close to her because she was so controlling.
When I was 16, Lori started to date Mike. He was probably the first guy I had a serious crush on. I found myself laughing and giggling all the time around him. And when Lori was not around, Mike would flirt right back at me.

One day just before I turned 17 (Mike was 27), I was home alone. My dad had taken my brothers to a baseball game, and Lori and my mom were shopping. Mike came over to see Lori, and when I told him she was not home, he said that he would just visit with me instead for awhile. It was so exciting to be alone in the house with him...omg. Somehow we got on a conversation about any boyfriends of mine, and I joked to him about how my last boyfriend was the worse kisser ever. Mike asked what I considered a good kiss, so I offered to give him a demonstration.
That first kiss, was just in fun for me to show him what I meant. But that led to several kisses, and pretty soon we were making out on the couch. I felt so grown-up! I was a little girl making out with a man. His hands were all over me - so I went ahead and started to rub him, too. I had only let a guy see my breasts and rubbed a guy through his pants up until that point, but had never gone any farther.
Mike kept telling me how pretty I was, and how I was so much prettier than Lori. Wow - I loved hearing that. He said he wanted to show me how turned on I made him, and soon I hear him unzipping himself. I was a virgin, and his was the first cock I had ever seen up close. And it looked scary to me...lol.
Mike had me put my hand on it, and soon I was stroking him as we kissed. He asked if I was on the pill, and I said no. Mike asked if I would still "take care of him" (I will always remember those words)
I ended up on my knees in front of him, and he instructed me how to put his cock into my mouth, and what to do with it after that. I knew about guys ejaculating, and I thought I was ready for it when it happened, but I was not. So much of his cum went out of my mouth, onto my shirt, and onto the couch. I dont know why, but I apologized to him for making such a mess. Mike laughed and said that he would work on it with me, so it would not be that messy again. After we cleaned up, we kept kissing in the kitchen until we hear my mom and Lori pull into the garage. I felt so alive!
That was the start of our affair.
For the entire year when I was 17, he would sometimes pick me up at school and we would fool around in his car, or I would let him know when I was home alone. I was still not on the pill, so it was me just giving him blowjobs every time we got together. But I loved doing it - I was doing something better than my older sister was doing for her man.
When I was just about to turn 18, my mother finally went in with me and got me on birth control.
Mike promised to make my 18th birthday special, and he got a hotel room for us. He was my first, and he and I made love for over 2 hours that day. He kept telling me over and over how I was so much better than Lori, how my body was nicer, my tits were better - everything an 18 year old girl loved to hear. I felt so smug, but he came to our house that same night to take my sister out on a date. He was with ME first, though.

I purposely did not go away to college, just so I could continue my affair with Mike. THere was one time where he had sex with me 6 days in a row, while still dating Lori. I loved having that secret.

When I was 19, I introduced him to a friend of mine. I knew his ultimate fantasy was to have sex with 2 girls at the same time, and that is something my sister would never, ever do with him. Even though my friend and I did not really do much with each other, I was so happy to give him that experience. He was 29, having sex with two 19 year olds. Mike was in heaven, and I loved taking him there.

When I was 20, he proposed to Lori. Part of me felt bad - in some ways I thought he and I would somehow end up together, even though he was 10 years older than me. But there is still a part of me that is so excited at being the "other woman" to my sister.

They got married last year, and Lori has no idea that he spent the entire night before their wedding making love to me over and over. I was a bridesmaid at the wedding, and every now and then Mike and I would glance at each other and just smile. My sister has no idea that he probably loves me just as much, if not more, than he loves her.

Thinking about them together on their honeymoon was aweful - probably the longest nights of my life. But the day after they got back, Lori went to work and Mike was due back until the following day. Since he was alone, I went to their house, and had sex with sisters new husband in her house, and in her own bed. Mike said he thought about me all the time on the honeymoon, and I am sure he did. He was VERY happy to see me.

I know I should feel more guilt - but I dont.
I have been having sex with my sisters husband for 6 years now - and neither of us seem to want it to end.
My sister may be older and wiser, but Mike wants me more.
If only she knew.