Let me start by saying me and my sister are male and female twins. We're twenty-five years old and have been close since we were born. She's been dating her boyfriend since our senior year of high school. My sister is 5'9" with shoulder length brown hair, dark green eyes and a nice, firm 34C chest. I'm 5'10", buzz cut brown hair and the same dark green eyes. Her boyfriend is a year older than both of us. He's 5"11" with a shaved head. He was the captain of the football team and is still in the same great shape he was in high school.
It all started one night when her boyfriend came over to my house to hang out. We watched a few movies and played a few video games. For some reason we started talking about the girls we've been with and it surprised me when he said he'd had a few threesomes with my sister and other girls but wanted to try one with another guy. For some reason this started turning me on and, from the slow growing bulge in his pants, I could tell it was doing the same to him. We talked for a few more minutes before I suggested that we watch a porn movie. I didn't think anything about it since I've watched porn with other friends. This was no different.
He said okay, so I went and found a good one. It was nothing but threesomes; MFM and FFM. I kept watching him from the corner of my eye. He was rubbing his cock through his pants. I told him if he felt comfortable then he could just strip and pull out his cock. He laughed and said he would only if I did, too. I smiled and nodded, standing up along with him, and we both stripped. I have to admit, my cock is a good size at seven inches rock hard, but when I saw his, my jaw almost dropped. It had to be at least nine inches. We sat down and started stroking. We both let out a moan at the same time and laughed. We stroked for at least two hot scenes.
Then, without warning, he began to slide his free hand onto my leg. I was surprised at first, but after a few seconds I leaned my head back as he began to rub my leg. I have to admit, I've always wondered what it would be like to be with another guy; I just never knew it might be with my sister's boyfriend. I saw a smile creep over his lips as I looked at him from the corner of my eye. His hand then slowly started sliding up my leg until it was the the base of my hard cock. I moved my hand and his took its place; he began to stroke me. I closed my eyes and moaned deeply. His hand felt good around my cock.
The next thing I knew, he took his hand off my cock and, without warning, I felt his warm mouth take its place. I jumped as he did this but then moaned even deeper as he began sucking. He then took his hand, slid it under my ass and began massaging my asshole. I spread my legs, letting him now do as he wanted. When I did that he slid a finger into my tight virgin hole and started fingering me as he sat back up now and watched me. As he did that, I reached over and began stroking his cock, looking him in the eyes. I told him he had an amazing cock and that my sister was a lucky girl.
He grinned and said, "Tonight, you're the lucky one." With that, he slid his finger out and told me to stand up and bend over the couch. Without hesitation I did what he asked and bent over, placing my hands on the back of the couch while I watched him over my shoulder. He slid a finger between his lips wetting it before sliding it into my asshole and lubing it up, making me moan once more. After he slid it out, I felt the tip of his cock against my tight opening. Without warning, he began to slide it in and I leaned forward, pressing my face against the couch, trying not to scream too loud. He slid it all the way in and held it there to let me get used to it. After a few seconds he began to fuck me.
I raised my head now and looked at him over my shoulder. His eyes met mine and he smiled. Then the next thing I saw shocked me at first, but then got me even more excited. I saw my sister appear over his shoulder with a big grin on her face. She looked at him and gave him a long, deep kiss. After they broke the kiss, she looked at me smiling even more and told her boyfriend, "I told you it would be easy."
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<a href="http://www.lushstories.com/stories/gay-male/my-sisters-boyfriend-2.aspx">My Sister's Boyfriend</a>