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We had been going out for a while. Kristy and I had been having sex for three years, since that Christmas. But I have always dreamed of having a threesome with her. I mean come on, my sister is fucking hot. With those grapefruit sized tits, and her tight little ass. Who wouldn't want to fuck her?

But we had to keep dating other people, so our parents wouldn't question our living together. So we agreed we could sleep with other people too. I picked out one of my classmates from my Anatomy class, and my sister picked one of hers. My girl, Shanna, has a body identical to my sister's, but with larger tits. So when I brought her to my place, my sister raised an eyebrow. All night long, my sister was checking out Shanna, and sort of giving her dirty looks. That night during our pillow talk, she asked me if I still thought she was pretty.

"Of course I do, sis. Why do you ask?" I questioned.

"Well I saw how you were looking at Shanna, and she has a better body than I do."

"Are you jealous?" I teased.

"Maybe," she retorted.

We talked a little more, fucked and then I cuddled her until we fell asleep, all the time wishing Shanna had been there with us.

When morning came, I asked her about it. I asked, "What would you say to a threesome?" She said, "I will think about it, but maybe."

I went to school with her, and wouldn't see her until tonight, as I was going to study with Shanna after class. When I saw Shanna, she said she had a surprise for me. I thought and thought, but I couldn't figure out what it was. While we were studying, she decided to make it interesting. She was going to quiz me, and for every right answer, she removed an article of clothing. If I got her naked, I got a BJ. Of course she made sure that I got her naked. Then she gave me an amazing BJ.

Afterwards, we met up with Kristy and her boyfriend, Mike at the Campus Bar