I heard my sister-in-law and her husband having s** in the loft upstairs on a family vacation. I stopped at the bottom of the stairs after everyone had gone to bed and the house was dark. I was just going to go to the bathroom when I stopped to see if there was anything I could hear. At first I only heard a couple of soft whispers. Then I heard some small sucking sounds. She must have been sucking his d***. My c*** jumped up. I heard her moaning softly. I took myself out and started to stroke. My wife’s parent’s bedroom door was 10 feet away. If one of them open the door they would find me standing half naked, stroking my hard c***. I climbed a few steps to get gear better. I could hear my sister-in-law softly moaning. I would have given anything to watch them. I went stepped down into the bathroom at the bottom of the stairs and couldn’t help but immediately explode into the sink. I cleaned myself up downstairs and when I came back up the loft door
had been closed. I wonder if they heard me listening to them f***. It would be even hotter if they had.