My sister and I shareing a friend, Part 1 SeXStoRY

My s****r Kayla 19 and I 18 have always been close, Our father left when we were little and our mom works constantly so we were each others best friend. When I was growing up I would always sit in my s****rs room and we would listen to music and watch girly shows. My s****r is Bi and when I started noticing that I was Bi also I talked to her about it and she was very supportive. My s****r and are very open sexually. I would be in her room when she would change and she would have no issue with me seeing her naked body. She was beautiful, Blonde hair, Green eyes, Tiny body, Nice tits and a firm ass. One day we were talking about sex and she asked to see my dick, I pulled it out and she smiled and said "Why do you have a hard on?" I turned red and she said "That's ok, your not the first guy to get a hard on around me." One day she came in my bedroom at night when I was watching porn on T.V and jerking off.Instead of freaking out she took her cloths off, laid next to me on the bed and started fingering herself. She looked at me smiled and said "Wanna help each other out?". Yeah I said than she hopped up and knelt in front of me and started stroking my cock and moaning like she was being fucked. After awhile she looked so turned on without even saying anything she wrapped her mouth around my cock and began sucking it. It felt so amazing, She stroked my cock as she went up and down on it. With her head down still sucking me she grabbed my hand that was on the chair and put it in the back of her head and I began pushing her head down on my cock as she gagged each time I pushed her down. I told her I was going to cum, she pulled her head off my cock and stroked me with my cock aiming at her tits but my cum shot out so hard it hit her tits and hit her in the face. I was so embarrassed but she just laughed and said "Wow you had a little pressure behind that". "Your turn" she said, she laid on the bed and opened her legs. I curled up between her legs and started eating out her smooth pussy. She had her clit pierced and I flicked it with my toung which made her moan and arch her back. I slid my finger in her pussy which was very wet and slid it in and out as fast as I could while sucking on her clit until she put her hand on the back of my head and pushed it down into pussy as she screamed "I'm gonna cum". Her body shivered as I could feel her pussy explode on my fingers. I laid next to her as she panted. "Your good at that". Thanks I said as she hopped up got dressed and said laughing "I'm going to bed, Thanks for the good time". I think that we both had the urge to have sex with each other but we were both waiting for each other to make the first move but neither of us did until one day. My s****r was Bi and she had, had sex with another girl before but I was also Bi but all I had ever done was make out with a guy and we jerked each other off. One day I talked to my s****r and said that I was anxious to actually have sex with another guy. My s****r said that she had a friend that she has known for awhile and he was Bi and that she was going to invite him over so we could all hang out. Our mom had left for work for the night, Kayla called Mike and told him to head over. Kayla and I sat in the the living room and were watching a movie when Mike showed up. He walked in and my s****r hugged him, he looked at me smiled and said "Hi". I smiled back at him and said Hi back. All three of us sat on the couch with Mike in the middle and My s****r and I on each side of him. The movie ended and Kayla asked me to run in her room and grab another movie. I ran upstairs and grabbed the first think I saw and as I ran down the stairs I stopped when I saw Mike on the couch with his pants around his ankles and my s****r on the floor in front of him sucking his cock. I stood there not knowing what I should do so I just watched. I could feel my cock get hard in my shorts as I watched her suck him just like she had sucked me. After a min Mike looked at me and smiled and as he did my s****r looked at me smiled and said "Get down here would ya". I got downstairs went to sit next to Mike and just as I went to sit down she looked at me and said "Oh no you come down here". I got on the floor next to her as she continued to suck his cock. After awhile she stopped and said "Your Turn". I got in front of him and wrapped my mouth around his cock and started sucking him. My s****r straddled him and started making out with him as I sucked his cock. She got back on the floor next to me and put her hand on the back of my head and pushed it onto his cock. She giggled and said "Suck his cock good". After awhile I stopped as she started sucking him again. After awhile of me and her going back and forth on his cock. She got up and said "Let's go to my room". We followed her into the room as she stripped all her cloths off and told Mike and I to get naked and sit on the side of the bed. Kayla got on her knees on the floor and began sucking my cock as she stroked Mikes. She went back and forth sucking us. She got up and told Mike to lay on the bed, she straddled his face so he could eat her pussy and I got on the other end and began sucking his cock again. She got off him and laid on the bed with her legs spread as Mike climbed on top of her and began fucking her. She moaned as I got next to her head and she began sucking my cock as she moaned and grunted. He fucked her until she let out a scream with my cock in her mouth as she came all over his cock. Mike got up and she looked at me and said "Your turn". Mike got where I was and Kayla began sucking his wet cock. I got on top of her and slid my cock in my s****r pussy as she let out a moan. I was so turned on and my cock was rock hard from the thought I was fucking my sexy s****rs pussy. I was smashing her tiny pussy when she said "Oh fuck!! your gonna make me come" I pounded faster and faster until she screamed and I felt her pussy gushing on my cock. I was going to get up when she pulled me back down and said "Keep going". I started fucking her again when Mike got up and went behind me and I could feel him slapping my ass with his cock. He lubed up and began sliding his cock in my ass. I grunted and moaned as my s****r looked at me smiled and said "Don't stop fucking me" I began fucking her again as Mike began fucking my ass. I let out a moan and a scream when Kayla said "Take that cock". I smiled but It hurt so much at first I forgot all about being in the middle of fucking my s****r. After awhile Mike pulled out of me and Kayla said "Fuck my ass now". I laid on the bed she got on top of me,I began fucking her again as Mike got behind her and put it in her ass. She screamed and her eyes rolled back as her her hair and was pulling her head back as he trusted deep and hard into her ass. She came twice as we both filled her holes. Mike and I switched and he fucked her pussy as she laid on top of him almost out of energy. As soon as I pushed my cock in her already gaping asshole she jumped up again and started moaning. Kayla got up and said "Suck your s****rs juices off his cock". I bent over the side of the bed and began sucking my s****rs cum off his cock. She went into her dresser and put on a strap on she had for when her girlfriends came over, got behind me and began fucking my ass. It was a huge strap on and I moaned louder and louder as my s****r fucked my ass. Mike got up as I stayed bent over as her and Mike took turns fucking me. Mike laid back on the bed as my s****r knelt over his body and put his cock in her ass with her back turned to him,she leaned back and told me "Put your cock in my ass too". I lubed my cock up as much as I could and shoved my cock in her ass with Mikes. I got it all the way in as she let out scream after scream with tears in her eyes. We both fucked her ass at the same time until she screamed and for the first time she squirted all over me and Mike as her body went limp. I pulled out and began fucking her pussy while Mike kept his cock in her ass. I fucked her until I was about to cum. "On my face" she said. I stood up and shot a huge load all over her face and in her mouth. She smiled and laid on the bed while Mike fucked her pussy until he came in her. He got up as she laid there with her legs spread exhausted. I was standing there looking at her wide pussy and her absolutely destroyed asshole when I got between her legs and began eating her pussy as all of Mikes cum began to run out of her. She moaned and said "Lick all that cum out of me". I licked it up as it ran out of her body. We all showered and when Mike left my s****r looked at me and said "Next time we will have a girl join us".