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Open Relationship

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by love_gauths I have an adopted sister. We have always had a very comfortable relationship. In the morning she will sometimes come into the bathroom while I'm taking a shower so we could both get ready for classes quicker. We have one of those open showers with the fogged over windows, so, she has seen me naked before. But one time she caught me doing something more. It was a friday afternoon and I had just gotten off work and was in the shower. The shower was the only time that I had a bit more privacy to myself (thin walls), so my afternoon shower was the only time that I masturbate. I had been waiting for this one. I hadn't masturbated for about a week. So I assumed my normal position: facing the right corner away from the door, my left hand proping me on the wall, my right doing the business. So, as I am jacking off, I hear the door open. I know it is my sister, because it's just me and my sister in the apartment. At this point, I was so far along, that I didn't care who walked in, and I just kept going. I heard her foot steps suddenly stop. It must have been pretty obvious what I was doing. My right arm was moving rapidly and there was the sound of water sloshing. She said, "Are you doing what I think you're doing?" "...Probably," I replied. "Well," she said, "I won't be long, I just need to do my make-up for tonight. I'm going to a movie with some friends from my Bio class." So she just started to fix her make-up, while I was in the shower jacking off! I felt embarrassed, but I just wanted to finish so bad. "Do you think you could wait outside for just a little bit longer?", I asked. "Why?", she said, "I'll just be a sec. Just pretend I'm not here." "Um... It's still a little difficult," I said. How could she be taking this so lightly? She sighed, frustrated, and said, "Just move your hand faster," and went back to her make-up. I thought, WTF?! My sister is giving me tips on how to jerk off! So, I concentrated and pumped harder. I started to make moaning noises. All bets were off, this was going to be loud. All the muscles in my body tensed as an orgasm flooded over me, I splurged all over the tile wall, let out a wail of pleasure. I stood leaning up against the wall, shaking. "See," my sister said, "I told you you could do it." She finished her make-up and as she walked out she said, "Make sure you clean the wall off."Life was cock raising ever after.....

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