I’ll just start out by saying that I understand some may think it’s wrong, however the taboo perversion of it still sits fondly in my memory. It happened years ago when I was a hormone induced teenager and constantly horny. From what I can remember I would jerk off at least once or twice daily. My sister and I had the typical sibling relationship where we were almost always fighting or arguing. For me she possessed the typical sister-nausea that comes with being siblings. However, it was hard to ignore that she did have a beautiful body. Had I not been her brother, I would definitely give her a look.Because it was such a strong emotional event for me, I remember it very well. We were only a year apart in age and over 18 when it first happened. The first time it happened my sister was sick and taking medication at the time. She had missed a few days of classes and was a disgusting mess from lying in bed, not showering, and non-stop coughing. It was in the evening and Lisa had just gotten out of the shower. Mom and Dad went out for the evening, leaving a phone number in case we needed to reach them. After her typically long shower, Lisa took her medicine and laid down in her bed. The phone rang and I picked it up. It was my mom checking in to see how Lisa was doing. I reluctantly (after all her room was swimming with germs) opened Lisa’s door to hand her the phone. Her TV was on with the lights off and she appeared to be sleeping. I called for her from the doorway but she did not respond. My mom told me that the medicine she was taking helped her sleep, so she was probably out. I stepped into her room and stood over Lisa, who was covered with a sheet. I shook her, but still no response. I relayed the information to my mom and she told me to let her sleep. I started for the door and turned back just to see if she was faking. Part of me thought she WAS faking, because that’s something she would do. So I walked back over to her and shook her again, but still no response. Still thinking that she was faking it, I reached down and pulled her sheet from her. Still no movement from her. I looked down, somewhat shocked as Lisa laid there on her side with one leg stretched across the bed. She was wearing only a night shirt which had crept up past her waist and her panties were fully visible. Although I knew Lisa was attractive, it was the first time I really looked at her in a sexual way. Still not knowing if she was faking to be asleep or not, I reached down again and shook her from her hip. Still no movement. She was facing away from me, so I was really staring at just her body – her ass in particular. Because there was no response from her, I was convinced that she was really asleep and not faking it. I turned to the door and then looked back at her again, this time I had a different angle looking more at her pussy through her panties. I could see the crack over her pussy lips through her panties and my dick started to grow. It was the first time I had gotten sexually arouse from looking at my sister.