When I got home after a long night out with friends, I was walking past my sister room and heard what I thought was faint moaning through her bedroom walls.
Tired and wondering if I was just hearing things, I headed to my bedroom and started to get undressed. But then the moaning started again, but this time it was louder and deeper.
By this point I was starting to get turned on and as her moaning started getting louder my cock started getting harder…