Back when my sister and I lived at home with our parents we were having sex together at least twice a week, even when we were dating other people. One night she had her boyfriend over to hangout and we all just talked and watched tv with our parents. Eventually me, my sister, and her boyfriend went outside and talked on our porch until he left for the night. I went up to my room and locked the door so I can drink without being bothered (I was 19 and had a bit of a drinking problem back then) and about half an hour later my sister knocked on my door. She quietly let me know she was about to take a shower and wanted to have a quickie in the hallway like we usually do. As I explained in a previous post, my sister and I started having sex in the hallway when our parents were downstairs so we could hear them coming up the steps and not get busted. At the top of our stairs is a half wall so you couldn’t see behind the wall until you got to the top of the steps. I went in my room and took my pants and boxers off so I was ready to go when she came out the shower. I was just standing in my doorway stroking my dick waiting to hear the shower stop. I stood there waiting until she came out in her towel and she started stroking my dick as I felt her up. She laid her towel down and laid on her back and let me fuck her missionary, then turned on her side and let me fuck her until I came inside her. We kissed and I rubbed her ass before she put her towel back on and went back into the bathroom to clean up. I went to my room and stroked my dick some more and kept smelling my hand with the scent of her pussy on it.