[ThomasMoore]

That was fantastic and Im sure you can remember every sound like it was yesterday! This is much more tame but years ago we were in the middle of renovating our home, but had my wife's sister visit on short notice for a week. A couple of hours before her arrival I ran down to the guest suite to give the bed fresh sheets etc. It was kind of cluttered with boxes and a few other duffel bags of stuff from the upstairs guest room that was under renovation. My wife and I had slept in that room for a couple of weeks as they were working on our bedroom, and living through a renovation is a horrible experience.
One evening late I was quietly getting some water from the kitchen and noticed some light from the end of the hallway? I thought that maybe the small light on a chest in the hallway had been left on, so I started down the long hallway. Halfway there I realized that it was coming from under the door of the guest room. I started to turn around and return back upstairs to our room, but heard something that had my heart pounding!
While using that guestroom my wife and I had gotten playful and had used my wifes toy on her during a session of sex one of the mornings. We had small kids and got interrupted midway. My wife had thrown the toy into the nightstand drawer and must have forgotten it was in there! I didnt have a keyhole or anything to see into the room but I recognized the distinct hum of my wife's toy! I was frozen and my heart was thudding hard in my chest as I stood there listening to what was going on behind the door! I could hear the way the buzz of the toy would get dulled as it was inserted and I knew that sound well from playing with it on my wife! I Loved hearing the sound dull and then clear as it must have been sliding in and out. I was also surprised to hear the buzz muffled for long periods of time as it must have been up deep inside her, compared to my wife who doesn't like that as much as letting it vibrate on her clit.
After quite a long time of listening I finally heard a long exhale of what must have been her orgasm! to this day I remember it well, much like the original poster! Since that night I have never been able to look at my SIL without imagining her using my wife's toy that one summer.