A few days ago, I woke up, went into the living room to watch some TV. I was just wearing boxers and a T-shirt. I was laying on the couch feeling kid of horny. My sister had just gotten up and was getting ready to go shopping. When she was in another room I pulled my penis through the fly in my boxers, and pretended that I was sleeping and it had just "fallen out". I had noticed my sister's car keys were on the end table on the far end of the couch, so she had to walk past me to get them. I was laying on my back fully exposed. The fact that she was walking in and around the living room knowing that she could see me, got me excited and I started to get hard. I had kept my eyes closed and waited for some kind of reaction like "wake up and put that away". I then heard her say to herself "WHere are my keys?" I then knew she had to walk RIGHT PAST me to get them so I had a full erection as she walked past me, she grabbed her keys and then left. Was there anything wrong with this? I could have just "fallen out" by accident.