I was living in a small appartment and I had only one neighbor on the same floor, a cute blonde girl around 25 years old. I met her a few times in the stairs and we only said "hello". She was not noisy and most of the time, I was ignoring her.
One night, as I was sleeping, I was awakened around 00:30, I did not know at first why. But after a few seconds, I began to hear some strange sounds through the adjoining wall. Then I realized that it was my neighbor who was moaning, as she was making love!
I had already watched many kinds of sexy videos, but it was the first time I was witnessing a moaning woman, gradually comming to orgasm! The reality of her screams and the noises of her squeaking bed was the most erotic thing I had ever heard. And luckily for me, her boyfriend kept coming to her appartment for a few months.
I have several great memories of their nights together, where I was sometimes opening the door of my appartment to hear them better. I remember hearing them running in the stairs, to go to bed as fast as possible. One time, they stood a few minutes in front of their door and I could hear them kissing, their clothes wrinkling under their hands, and their breathing becoming more and more intense as the desire was growing. I would have given a fortune for a hidden camera!
They quickly opened their door, and they made love with passion. As always.One time, as her boyfriend was slowing down, she said "Encore! Encore!" (Again! Again!) before he accelerated his rythm. Those two words of passion, the desire in her tone, this was amazing!
Another time, I knew they were practicing oral sex. She was moaning as she always did, but I couldn't hear the bed squeaking as usual and I had the confirmation of my intuition when she became silent and I managed to hear her boyfriend's sighs. At a moment I heard him whispering "Oh! Vas-y!" ("Go on!" or "Keep going!", not sure of translation). I'm pretty sure having heard him ejaculate, maybe for a cum in mouth.
I think she was not simulating. It sounded authentic and one night, she screamed way harder than usual, making me think that she was really enjoying her boyfriend's presence.
Since I know websites like sexsoundlovers, I regret not having recorded their nights together, but the sound would probably have been horrible. Anyways these are great memories and I wanted to share them with you.