When I was 6 my parents divorced. My s****r and I lived with my mom. My dad ended up marrying a younger woman. It wasn't long before they started having k**s of their own. When I was 7 my little s****r Nikki was born. Two years later my little b*****r Tyler. Being so far apart we weren't that close growing up. Also, my father lived a state away so we didn't see each other as often. When I turned 18 and started college all of that changed. My college was one town over from my father's house and when I needed a break from the dorm life or a home cooked meal the obliged. By now my half siblings had grown to the respectful ages of 13 and 11. Nikki was involved in just about every sport there was and was turning into a beautiful young woman. She was tall for her age, a leggy doe eyed blonde. Her body was fit and it drove me wild as she would walk around in her sports brad after practice with her short shorts. Even the tight sports bra couldn't hide the fact that Nikki was becoming a woman. Tyler who was two years younger hasn't quite blossomed as well as Nikki. He was a good k** but shy and always buried in a video game.
One Friday when I was at school my dad called me to ask me if I would watch the k**s overnight. They were supposed to go to a wedding but the sitter canceled. Sure I didn't mind. I was broke and it would do me some good to get away. I pulled up to the house about 7pm. All the lights were on and I could hear a movie blaring from the basement. I opened the door and found a note from my parents letting me know there were leftovers in the fridge and they would be back tomorrow afternoon. I promptly made my way to the fridge and heated up some leftover lasagna. I realized that my sibs didn't hear me come in over their movie as no one made their way upstairs for my usual welcome home greeting. When they were younger I used to love sneaking up on them and scaring them. I found this to be a perfect opportunity. I grabbed my bag and crept down the stairs toward the basement. My parents had made it into a f****y room/ makeshift bedroom for me when I came home for the weekends. I opened the door and peered through and my mouth dropped at what I saw. On the couch Tyler was laying with his shorts pulled down to his ankles. Nikki's back was to me and with her long blonde hair pulled up I could see that she wasn't wearing a top. Her head bobbed up and down as Tyler had his head back and eyes closed. I accidentally pushed on the door and there was a creaking as it opened slightly. I ducked back into the darkness as Nikki's head spun around. I could see her perky breast. Her hand was wrapped around Tyler's member and I could tell by the fact that it was glistening in the glow of the tv that a moment ago it was her mouth that was firmly wrapped around it. She turned back towards Tyler and said something that I couldn't quite make out but whatever it was it meant the show was over. Tyler swiftly pulled up his shorts and Nikki quickly rose to her feet and grabbed her tshirt but not before I got a good full view of her toned and perky body. I couldn't believe I was so turned on. My cock ached inside my shorts. As my s****r made her way towards the door I crept up the stairs and quickly sat at the table behind what was now cold lasagna. My s****r looked both surprised and happy to see me. "Zack!?, when did you get home?" She stammered as she pressed herself against me giving me a hug. "I just got in", I lied. Tyler made his way upstairs and gave me a wave. I am sure he was down stairs waiting for his hard on to subside before coming upstairs. Mine was barely gone from the show I had just witnessed. The evening was awkwardly quiet. We all watched a movie downstairs. Eventually it was time to get everyone to bed. I order the sibs upstairs to their rooms. I first checked on Tyler. As usual he was in his bed with his playstation portable. I said goodnight and headed to Nikki's room. She was just getting into bed. I bent down to give her a hug and wished her goodnight. She had a worried look on her face and I knew she knew that I knew what they were doing in the basement. "Yes, I saw" I said, "but your secret is safe with me". I told her that it was natural to be curious. I told her that Tyler was a blabber mouth however so she'd best be worried about him rather than me. She said she caught Tyler in our dad's porno stash and she promised not to tell if he let her play with him. I asked her where she got the idea from and she said from her friend Kelsie. They were over at Kelsies house one night and they were daring her little b*****r to let them see him naked and touch him. She liked it and thought shed try it with Tyler. I asked her if she liked it and she said that she did but didn't think that Tyler did. She said he didn't seem as into it as those guys in our dads pornos. I was shocked to find out that she too looked a his porn. I told her that it was just because Tyler was too young to appreciate how hot she was and what she was doing for him. She looked up with a twinkle in her eye and said "Do you really think I'm hot?". "Absolutely" I said. "I check you out all the time". She had a big smile on her face. Then she asked if I had ever had any sexual thoughts about her. I couldn't lie and told her that I had and from what I saw tonight I was sure they weren't going away anytime soon. She confessed to me that she had had thoughts about me. That she had purposely tried to walk in on me in the shower to see me naked. I jokingly told her that all she had to do was ask. She took my joke seriously and asked if she could see my member. I asked what I would get in return and she said she would take off her top for me. I was so rock hard at the thought of her stripping for me I chanced it and told her that if I showed her my cock she would have to get completely naked. To my surprise she agreed without hesitation. I needed to release my cock as it was now throbbing at the moment thinking about what was happening. She sat up on her bed and I took down my pants and boxers revealing my rock hard manhood. Her eyes were wide and her mouth gaped open. "Wow",she said, " you're big." "Thank you" I said slyly. To my surprise she reached out and grabbed me. "Not so fast" I said. "You need to live up to your end of the bargain". She stood up and first dropped her shorts. She had a small mound of fur by her little pussy. Then she took of her shirt revealing perfect little perky breasts. Her body was gorgeous. She reached out again and grabbed my erection, her eyes wide and fixated on it. I took this as permission and reached out and fondled her breasts. She moaned a little. I asked if she liked it and she said it felt very good. She began to stroke my cock and looked up at me as I have her a nod of approval that indeed it felt good. My hands wandered down her stomach to her little mound below. I gently ran a finger up her pussy lips. To my surprise she was very wet. I slid my finger up and down a little deeper and her knees started to shake. I asked her if that felt good and she said yes so I continued rubbing her little clit. Her hands felt amazing around my cock and I could feel my precum starting to flow. She stepped back and watched as some precum came out of the tip of my cock. "Did you just cum ?" she asked. I told her that if I came it would be a lot more than that. I explained what precum was and she said she wanted to taste it. I told her it was ok and she got onvher knees and ran her tongue around the head of my cock. She continued to lick the head of my cock and eventually took it into her mouth. She looked up at me with her beautiful blue eyes as if seeking approval and I told her how good it felt. She was driving me insane. She slowly started taking more and more until she was running her lips up and down my shaft. One hand held her hair back as my other gently caressed her b**sts. I felt myself about to cum and told her she had better stop. I wasn't ready to cum just yet. I brought her to her feet and guided her to the bed and instructed her to lay down. I spread her legs and drank in the sight of her adolescent pussy. So pink and tight. Brining my face closer she smelled sweet. It was warm and glistening. She shuddered as I ran my tongue up and down her lips drinking in her sweet nectar. Her body was shaking but she was moaning so I kept going. All of a sudden I felt her body stiffen as she grabbed my head. Her breathing got so deep and she moaned "don't stop". I kept going until her body convulsed in orgasmic shock. I sat up and straddled her as her head was thrown back into the pillow. I leaned down and kissed her gently on the lips. She kissed me back as I felt her tongue slide past my lips. I felt her hand reach down and grab my cock. This time however she wasn't stroking it, but guiding me towards her dripping wet pussy. I lowered my hips and positioned my hips with hers. I looked into her eyes and asked her if she really wanted this. She nodded which was more than enough for me. I grabbed my cock and ran it up and down her pussy lips. The tip glistened with her cum. I then gently pushed in the tip the entrance of her tight little hole. I spread her legs wider as I slowly slid the entire head of my cock inside her. She winced at the sensation but as her breathing slowed I slid more and more until I was half way inside her. I asked her how if she was ok and she sighed "better than ok". I pulled out slightly and then pushed back in. Ever so slightly I raised and lowered my hips. Our eyes were locked on one another's as we were getting lost in the moment. I put her little legs over my shoulder and slid in deeper. She let out a little whimper. I asked if she was ok and she assured me she was. I couldn't hold back anymore. I was sliding the full length of my cock in and out of my baby s*****r and loving every minute of it. She clenched my cock so tight it was only a matter of time before I was going to cum. As much as I wanted to I knew I couldn't cum inside her. Just before I was about to cum I pulled out of her and covered her stomach, breasts and chin with cum. She reached down with one finger and took some cum on it and brought it to her lips. And then some more and more until it was all gone. I was stunned watching my little s*****r take my cum. I laid next to her and held her in my arms. She said that she loved me very much and thanked me. The pleasure was all mine I thought. There she slept in my arms until I woke early in the morning and dragged myself down to the basement so not to arrouse suspicion from Tyler. I had a feeling that I would be spending many more weekends at home from now on.