My Favourite Sister Story.

My sister had been teasing me all afternoon, telling me details about how her boyfriend didn't need to use a rubber, as she was on birth control, so he could finish inside her. All the talking was making me so hard, so I showed her how hard she had made me get. Let me finish inside you, was my request. She was in a two piece bikini that tied up at the sides for the bottoms and at the back for the bikini top. She walked towards her room with me so close behind her that my cock kept touching her butt cheeks. She was giggling and clearly in a flirty mood. She'd slow to almost a stop to allow me to rub my stiffness on her arse, before slowly walking away. After a few of these, I grabbed a string at her hip, and pulled. Her bikini bottoms came loose on one side, almost falling from her. She caught it in time with one hand and shuffled towards her bedroom. As soon as she was close enough, I gave her a shove towards her bed and tried to land on top of her as best as I could. She was kind of sideways, easily pushed me off her as she ran out of the room, holding her bikini bottom from falling with one hand. We were now running around the house, my cock was trying to lead the way towards her, like some kind of guidance system. I caught her in the living room, which was right at the front of the house and very visible from outside. I was so turned on that I didn't care, and the single seated couch that she had just landed in was where I intended to screw her. I positioned myself on my knees between her legs and began pulling her hand away from the grip on the bikini bottom string. All as I moved close enough to rub the head of my shaft on her pussy. That's when I realised she was wet already. I took this as a green light and began trying to penetrate her. I managed to get a little more than the head inside her, when out of nowhere she successfully shoved me backwards off her, as she ran off again. She went in our parents room where she had no escape. She then dove onto the bed backwards with me close behind. With her legs spread, she grabbed our mothers large toy leopard which was an ornamental feature for the bed, pulling it between her legs saying oh yeah, fuck me, fuck me, fuck me, as she made humping motions with her hips, with the leopard on top in missionary position. With her legs spread wide and raised, I positioned myself sideways below her hips, placing my cock between the leopard and her pussy. She didn't try to stop me, she just kept grinding her hips rhythmically against my throbbing shaft. I could tell she was ready for entry by the combination of her actions and filthy talk. I wasn't thrusting, she was. I was slowly guiding the head of my cock between her pussy lips and her insides. She didn't stop grinding as my cock began to disappear inside her wetness. My goal was to cum as deeply inside her as I could, so with each of her movements I inched slowly deeper and deeper than I ever had before then. As we did things in stages, she'd never allowed me to go much further than the head or tip until then. Eventually, I felt our public bones meeting, making it obvious that I was using more than just the usually permitted tip. That's when I started to slowly grind back towards her movements. She was still grinding when I asked her to give me her hand. At this point she removed the leopard from between us as she gave me her hand. I moved her hand between us telling her to feel hew deep inside her I was. I told her that I couldn't get any deeper if I tried. Hurry up was her response as she went right back to grinding. I liked her talking dirty, so I asked her to say fuck me which she began repeating. I began to plunge as hard and fast as I could, before realising that I was about start cumming. Pausing suddenly to ask her if she could feel it, and her response was to say yes, keep going as we heard our mothers car driving up our street. Fortunately she didn't look through her bedroom windows as she pulled into the driveway. My guess is if she'd noticed that her first born was just finishing draining his nuts deep within her second borns love tunnel, she probably would have had a heart attack. My sister panicked, straight into action mode for hiding what just took place. She shoved me of her and rolled off the bed sliding into the master bedroom toilet in one smooth motion. I followed and watched as she began looking down watching my load pour out of her as she pushed. I was was seeing my own creampie being pushed out of my sisters swollen and pink pussy. My jaw was wide open as she looked up a said, get out! I took notice of how serious she was, and I ran down the hallway while our mother was opening the front door. My sister managed a casual conversation with her as her brothers semen was leaking from her body. She was a champion at acting like nothing had been happening while our private parts were still tingling and leaking.
I have no proof, but I believe that my father had been doing fucking her as well.