[bobbobson]

My gf and I were staying over at our friend's (Nick and Lisa) house after a boozey night out. Lisa is a slim brunette with a very tight body, perky c cup tits and an amazing tight butt - all of which we have seen at a swingers party, but that's another story entirely which I might tell in another thread!

We stayed in their spare bedroom which was right next door to their master bedroom. We had left our bedroom door open and so had they, so there wasn't much distance for sound to travel. Anyway, I woke up early the next morning to hear a fairly loud rustling sound coming from Nick and Lisa's bedroom. Intrigued, I listened intently and as it went on I could hear Lisa's heavy breathing, shortly followed by her moaning. It was very hot, knowing that they were just a few yards away f***ing. And, knowing them and how naughty they can be, I am sure they left their door wide open specifically so that we could hear them.

Anyway, Lisa's moaning made me very horny so I started jerking off very slowly and carefully as my gf slept next to me. But after a while Lisa's moaning got loud enough to wake up my gf. Embarrassed, I stopped jerking as soon as she started to stir. She then whispered to me "is that noise what I think it is?". I nodded in reply as she noticed my hard-on pitching a tent under the duvet. Acting in mock surprise, my gf then told me to carry on what I was doing. I asked her if she wanted to f**k too but she didn't fancy it, so I carried on jerking off and my gf watched me intently with a grin on her face.

By this stage the rustling noises next door had been replaced by slapping noises and Lisa's moaning was very loud and clear - they obviously wanted us to hear them by now! I lay on my back jerking furiously, imagining Nick slapping into Lisa's tight a*se as he f***ed her from behind doggy style, while my gf offered one of her big E-cup boobs to grope as I did so. I came shortly afterwards in time to hear Nick and Lisa finish and then go back to sleep. Later that morning at breakfast, my gf teased them about the noise they were making. They didn't seem too embarrassed and were quite pleased when my gf told them what they obviously wanted to hear by pointing out that we both enjoyed listening to them. She can be such a tease sometimes! Nick teased back by suggesting we watch them next time. Who knows, maybe we will!