It was the summer before I started college and my sister was home for summer break. She was two years ahead of me in age and academics. It was early afternoon and I’d just returned from the gym. Both of our parents were at work. I called down the hall but I got no reply so I figured nobody was home. In my bedroom I dropped my bag and stripped for a shower. Wrapping a towel around my waist I headed towards my parents room. I prefer their walk-in to the tub shower in the hall bathroom. They allow us to use it as long as we keep it clean. Rounding the corner into my parents room I reached the open door and stopped dead in my tracks. My sister stood in the walk-in shower totally n*** with the water off and leaning against one wall with her eyes closed. Her hand was between her legs sliding two fingers in and out of her naked shaved p****. Her other hand lifted and was squeezing one of her b*******. Lifting it to her mouth she sucked her n***** between her lips and bit down on it moaning loudly not even noticing me. My c*** rose hard and fast beneath the towel making a tent at the front. My sister had always been very flirty with me, but now watching her naked I really realized just how incredibly s*** and gorgeous she was. My c*** throbbed and ached harder as the towel loosened. I let it slip to the floor so I was standing naked in the doorway. Wrapping my fingers around my c*** I stroked myself slowly to feel the naughty delicious delight of secretly watching my own gorgeous sister f*** herself in the shower. My sister started moaning and jamming her fingers faster in and out of her h**** c***. Then I heard her say to f*** your sisters hot p****! My heart froze. My sister was m*********** herself to the fantasy of me. Moving closer I stood directly in front of the shower door. In spite of myself a moan escaped me. My sisters eyes flew open and she screamed in shock freezing in place with her fingers still inside of herself. I breathed heavily while stroking my c*** in front of her. My sisters eyes widened as she looked at my d***. Stepping closer still beating my c***, I stood at the doorway of the shower looking at her. My sister pressed her back into the wall facing me. Spreading her legs until she had a foot against each corner, she arched her back, shoving her p**** out at me. Then she told me to f*** her. F*** your sister. Stepping into the open shower I grabbed her and pulled her to me. Clamping my mouth over hers I kissed my sister hotly jamming my tongue between her teeth. Lifting a leg I wrapped it around my waist before entering her in one motion. She yelled before pushing her tongue into my mouth. My sister felt warm and wet as my c*** slipped inside of her. She squeezed hard, grabbing my rock hard shaft with her muscles massaging around my d***. I moaned lowering my head to her hot naked t***. Lifting one I swirled my tongue around a thick n***** sucking it into my mouth. She moved her hips f****** her p**** around my c***. With her hands she pushed my face into her massive breasts as I mashed them together. I flicked my tongue over both of her pointy n****** trying to get them into my mouth at the same time. We kissed again sucking each other’s tongues as we fucked against the shower wall. My sister breathing heavily told me that she was going to c**. I pounded harder reaching under her and grabbing two handfuls of her luscious a** cheeks pulling her into down and onto my c***. I was f****** my gorgeous sister for all I was worth. Suddenly she grabbed at me clamping her teeth together on my shoulder and came hard gushing all over my c***. Holding onto me for support my beautiful s*** naked sister leaned into me. Kissing me hard and ground my steel hard c*** to ecstasy and bucking wildly. As my own o***** started I sprayed my hot thick c** in ropes inside her p****. Finally I shot my last and we stood holding each other tightly and trembling. After a moment I looked into my sisters beautiful blue eyes and kissed her passionately on the lips.