One day I went to my sisters place to use her shower due to the fact mine was being fixed. She was working, so I figured it was ok. After I got there I noticed her bedroom door was shut and I could hear moans. At first I thought it was the tv left on but then I heard something that made me freeze. It was my sister and she was moaning my name and saying all kinds of nasty things.
I was shocked but also feeling aroused. I called out her name to let her know I was there and suddenly she was quiet. I waited a minute and then her door opened and she walked out in a sheer nighty and said hello. I didn't notice at first and explaind that I needed to use her shower and she said sure. Then I watched her walk across the room and noticed her totally nude under the nighty she had on. My dick started to get hard and I said I was gona go take my shower and went to her bathroom. I couldn't beleive I just saw her big tits and bald pussy thru her gown.
My dick was so hard I had to stroke off soon or I would bust. I turned the shower on and undressed. Before I could get into the shower, the door opened and my sister stood there looking at my hard dick. Then she said, oh my god, your cock is nice and hard, is that for your horny sister? I was so hard, I didn't even realize this was my sister talking dirty and looking at my dick! I told her that I was sorry and she just said, if I don't tell anyone, then maybe if I don't cum too fast, that she might even let me stick it inside her a little bit. I looked at her and asked, what are you talking about? She walked towards me and said she couldn't wait to pee and thought I was in the shower. I told her its ok but why didn't you knock? She said I interrupted her and could tell my dick was getting hard, so she wanted to see what it looks like.
She has been fantasizing about it ever since she found a picture of me jacking off. I couldn't believe this and asked her, when? She said just forget it and told me to go take my shower. I stepped into the shower and noticed that she was going to go pee. I watch thru the curtain as she sat on the toilet to pee. I could feel my dick throbbing. She said something but I couldn't understand what she was saying. Then a minute later she told me that she has to take care of herself. I couldn't take it any longer, I told her that she is making my dick hard and I need to jerk off. She said, oh yea! Jerk off for your sister, I want to get dirty and be a nasty slut with you.
She leant back on the toilet and opened her legs and I saw her pussy lips were swollen and wet. She rubbed two fingers up and down her slit. I stood staring at her jerking my cock. Not many minutes later we both came together, me shooting my cum landing at her feet, and she rubbing her pussy hard whilst her legs jerked straight and gasped loudly.