My sister Rachel was now living at home with my parents. She ended up getting pregnant while at college. My parents were furious with her as she was going to drop out of her last year at school. My parents tried to get her to tell them who the guy was but she wouldn't tell. My Dad had steam coming out of his ears for some weeks.
My sister was going to have the baby and then put it up for adoption. While she was at home I was her go-to guy. I was eighteen at the time and my sister was having me drive her around. I was taking her to the doctor's office whenever she had a checkup. I would look at her baby bump and I hate to admit it, my cock would get hard.
Rachel's breasts were getting bigger and that was turning me on. One day after I took her to the doctor we got back home in the afternoon. My sister went to her room and closed the door. I knew what she was going to do. I could hear her moaning when she closed the door. I figured she was playing with her pussy. That day she was getting loud. I put my ear up to the door and I heard the sound of a vibrator going.
I stood outside and I was rubbing my crotch. I knew this wasn't a good idea but all that moaning made me horny. I got my courage up and I cracked the door to Rachel's room. When I looked in I saw my naked sister working the vibrator all over her opening. I couldn't take it anymore. I opened the door and stepped inside.
"What are you doing in here Brad?." My sister's eyes went wide.
"I heard your noises and I had to see you," I told her.