A few days ago, my girlfriend, her sister Stephanie, and some other friends (2 guys and 2 girls) were over at my place. We were drinking when gf suggested that we play truth or dare. I was surprised that she said that because with her sister here things could get kind of weird. Would they be making out or flashing each other? Everybody else wanted to play so I said fuck it let's go.
As always, things started off slow. People kissed each other. Eventually everybody had at least their shirt off. At some point, after more drinking, things got intense. It was my turn again. I said dare and gf said "I dare you to fuck me on the couch". It got quiet for a second. I thought she was joking, but she wasn't.
We have fucked a lot in front of girls and guys, but never in front of her sister. We've never even talked about it. But here she was asking me to do this. The guys were pushing me to do it. I look over at Stephanie and she says, "You better say yes". I nervously say OK.
gf takes her clothes off and takes the rest of my clothes off. My dick is so hard even though I'm a bit nervous. I was really turned on by this. gf got on her knees and started sucking my dick. I put my hands on top of her head. I could feel my dick throbbing in her mouth. After a few minutes, she stood up and laid down on the couch.
I put my head between her legs, and I started to eat her her pussy. She was already soaking wet. She came in a few minutes. I turned around and saw everybody, including Stephanie, just stare at us. I couldn't believe I was about to fuck gf in front of her sister. I stopped overthinking it and I stuck my dick in her. She started moaning right away. I had to use all my willpower not to cum early since I was so excited.
As the nervousness went away, I started fucking her harder, not even thinking about anything else. I wanted gf to cum again. And after a few more minutes she did. I lasted for a while, and then I came in her. We both stood up. We kissed for a bit. We looked around and everybody looked so happy. I looked over at Stephanie and she gave me a real sexy smile. I could tell she enjoyed it. I did too. And I know gf did since she had two orgasms. Definitely one crazy night.