This happened years ago and caught me by surprise (well, surprise is really an understatement). My now-ex girlfriend (Laura) and I had been steady for a while, and her younger sister (Chloe) had moved in with us as she just moved to the country to get her masters' degree (we're all immigrants). For all those years Laura and I were together, I had never met any of her family members so Chloe was the first one I met. Being polite, I was keeping myself very proper just to make sure that she didn't get bad impression about me. But little did I know that my girlfriend had been sharing a lot of stories about me to her sister.
So one day Laura and I were making out in the living room and we didn't notice that Chloe came home. By the time I noticed she was there watching, it was too late and I was like a deer in a headlight. I just froze and stopped making out (it was hilarious thinking back), I pulled Laura away and eyeing her with the "your sister is here!" look. She turned around and saw Chloe and then they both erupted in laughter. I was so confused and asked what was going on and why they laughed. Laura said that Chloe would understand, and Chloe said "Yeah, I've heard stories about you".
I was really unsure on how to react because my girlfriend never told me anything about her sister being told stories about us. Then Laura surprised me by moving behind me and grabbed my crotch from behind (we were all fully clothed) and said something along the line that I was horny and my dick needed some attention. So Chloe said to not mind her and continue on. She would just be in her room, but as she walked pass by the two of us, she grabbed my crotch too (over the pants as well) and playfully said "be good".
My jaw literally dropped, and my girlfriend and I ended up having great sex.
This was the first time it happened, and it was the beginning of many surprises/fun later on. I ended up seeing Chloe naked, but we never crossed the line of actually having sex with one another. She did grab my dick time to time like I was her own boyfriend, and I did get to grab her breasts a couple of times. It was years of fun and I thought Chloe was the coolest girlfriend's sister ever.
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