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I (22M) and my girlfriend (21F) have been in a relationship for the last 3 years. We absolutely love sex and do it all the time. I’d even say we’re the horniest couple ever. However, for the past few months, I’ve started to feel a bit less sexually attracted to her, and I don’t know why.

A few days ago, her younger sister (19F) came to visit us. She had just finished her exams and came to stay with us for her vacation. We had a great time traveling to some beautiful places together.

One night, we all went to bed (we shared a big double bed). I started having thoughts about having sex with my girlfriend in front of her sister. The lights were dim, so I started kissing my girlfriend. She kissed me back, and soon I put my hand on her boobs, squeezing them. She got very aroused.

At that moment, she thought her sister was asleep (although I think she might have just been pretending). Under the blanket, I undressed my girlfriend, and she helped me get undressed too. I felt like her sister was watching and listening, and for some reason, that idea turned me on even more.

I began having sex with my girlfriend, and she tried to keep her moans quiet. Suddenly, her sister shifted a bit in the bed. My girlfriend panicked, thinking her sister might notice what we were doing, so we froze and pretended to be asleep. Her sister asked me for a blanket (which was within my reach). Despite my dick still being inside my girlfriend, I handed her the blanket.

After that, her sister seemed to fall asleep again—or maybe she was just pretending. I resumed having sex with my girlfriend and eventually finished inside her. It was one of the best sexual experiences I’ve ever had. The thought of her sister possibly watching us made it unbelievably exciting.

The next morning, her sister didn’t mention anything and acted completely normal, like nothing happened. My girlfriend is convinced her sister didn’t notice anything, but I’m not so sure.