s*x story

So me and my sister have always been pretty close. My names Ryan, I'm 22 and Im about normal sized and looking, My sister helen, is 20 and she is a bit on the plumper side but thats what intrigues me about girls. In my opinion Helen is absolutely stunning and seductive. Being near has always had it's advantages, when we were kids we used to always play action man versus barbie which lead into real fights. Them it went into what pop band was superior which ended up in singing contests at home. As we hit puberty it transformed into wrestling, my dad was huge on wrestling so we used to watch it and afterwards play fight again. I enjoyed these fights since being a teenager i was infatuated with s*x thus I always groped my sisters ass and boobs without it being questionable. Now were older we constantly hang out in each others rooms and watch dvds and talk pretty openly about anything and everything. Today we both got the day off work and we were waiting on mum to come in and make dinner so we decided to rest in my room and started watching a movie that accidently involved s*x. This brought a talk up about what each of us have done s*x wise. I know Helen isn't to everyones taste but she was stunning if you don't mind she was a touch huge. I see past that and see a girl with stunning eyes and lips, extremely huge boobs and simply all around cute. As i arrived downstairs mum was putting dinner on the dining room table and Helen was helping herself to some coke. Helen gave me an odd look, not like a WTF just occurred look, but like I want more type look. I sat down fairly quickly since i still had a semi in my shorts and I didn't want mum to see. Helen came and sat next to me as usual and mum sat next on the opposite side. Dad was working late so he wasn't there. We started eating and mum was asking about our day and we just stated the normal (we obviously skipped out what just happened) and we asked how work was which started a pretty boring lecture from mum about what she has to go through each day and how the manager gives her hell etc etc. As i was totally uninterested I was eating my lunch and wondering about what happened upstairs and it appeared like Helen felt the same.. Mum completed her food and walked to the sink to put her dish in and as she did so my sister tossed me off really hard and quick which blew me over the brink. I couldn't warn her as I arrived. I knew it was a lot and it astonished my sister too.She licked her lips so I take it she enjoyed the taste. Helen got up and brought mine and her plate away and started washing up. I didn't have to wait long before hearing Helen racing up the stairs, but before she came into my room she first went to see mum. Before I could start panicking about what they were talking about Helen was in my room and putting the stopper in my door. "Mum just said she's going to be at least an hour working and dads not due back for a while," Helen added with a wide smile. **** Helen rushed out of my bed grabbed her stuff and darted into her room and shut the door behind her. I went to my door locking it and threw my door stopper in the bin. Stupid thing. It wasn't long before I heard dad's quiet snoring and assumed they were both asleep. By this time the CD had finished and I was getting in bed. I sleep in just boxers since it's far too hot, when I laid down i felt the moist patch on my side. Wow Helen left a nice memento of what just happened in my bed. About 10 minutes later, as I laid there looking at my ceiling with the visions of today in my head I heard my door close quietly. I looked down and saw my sister standing there naked. She moved carefully over to my bed and pulled the covers and climbed in, covering herself with the covers again. My sister was naked in my bed and I grew so aroused. With that we started kissing. It got to about lunch time and I started getting a little bit hungry. We were simply hanging out laying on Helen's bed so i suggested we went and bought some lunch. We walked into the kitchen and put on a pizza and sat at the dining room table and carried on speaking. Without my sister's hand in my pants this time. We ate the pizza and Helen was still a bit hungry so she fetched an Ice lolly from the freezer and started sucking on it pretty seductively and looking at me. "I like sucking on lollies, but I prefer yours," Helen mocked. ** Helen got up and pulled her leggings and underpants back up and exited the kitchen. I just stood there shocked. A few minutes later Helen came sprinting down stairs fully clothed and with her suitcase. "I'll be back later babe, just going shopping," Helen remarked. Before I could object Helen had blown me a kiss and gone out the door. I pulled up my shorts and scrubbed the dining room table. I didn't see Helen till the evening when she came dashing in and up the stairs with a number of shopping bags, by that time mum and dad were already home and I just had to look like I didn't care. The next three hours were torment for me and I'm assuming it was terrible for Helen too. Firstly, all of us enjoyed dinner together at the dining room table. The notion of what transpired a few hours ago at this table was still fresh in my memory. It was hard to concentrate and keep up with the talk at the table, a few times I was asked for an answer that I did not hear the question to. "Ryan your very distant tonight what's the matter?" my dad inquired. "Hmm, just thinking" "About girls eh?" I perked up and looked at my dad, I noticed my sister looked over to me as well. "Well, yeah i guess, there's a girl I really like, but it's impossible" I said. "Never say never, your a handsome fellow, you might stand a chance." I choose to not answer that. "And what about you dear?" my mum said to Helen. "What about me?" Helen answered. "Any boys being looking you up? Any boys take your fancy" "Well you know, there may be some guy I like" Wow, this was incredibly weird. Luckily the topic halted pretty much from their to Helen and my liking. Then being a friday, we have a family night sort of thing, when we get a film to watch and junk food and enjoy a movie together. It was my mums pick tonight and she put on a movie called 'Serendipity' about two strangers meeting by coincidence. They then see if they should be together by fate, they then go their separate ways, but a few years later they rediscover each other again. Mum and Dad sat curled up together on one sofa and me and Helen were on the other. Helen and I repositioned ourselves so we could hold hands during the movie, without our parents witnessing. After the film had completed mum and dad headed up for bed and left Helen and me below. We waited there for a few minutes were waiting for our parents to call down. "Night guys," mum and dad called down. "Night," we answered. As we said that we sighed a sense of relief and nestled up together on the sofa and started kissing. As we were kissing I grabbed hold of my sisters boobs and started stroking them. "In a minute," Helen giggled, as she stood up. "I'm going up stairs, come into my room in 10 minutes." Helen headed upstairs with a large smile on her face. I waited what seemed to be an age and then headed upstairs. As I got upstairs I went to my room opened the door, waited a few seconds, then closed it again so it sounded like I was in my room, an old tactic me and my sister used since we were kids when we were told to go to bed and we didn't want to. I then crept to my sisters room, silently opened the door, snuck in and closed the door behind me. What I saw was the most exquisite image. Helen's bedroom light was turned off, but she had placed up candles in a few areas around the room so i could still see well. On the bed sat my sister, Helen clad in a see through white corset with matching underwear. It was certainly not something you should see your sister wear. She was resting there seductively and she pointed at me and invited me with her finger to the bed. As I walked up to the bed my sister sat up and kissed me while pulling my t shirt over my head. I stood there enjoying the view as she kissed my chest and was undoing my jeans. She swiftly unzipped them and pulled them down along with my boxers. She truly wanted me. After that I pretty much fell straight asleep. I don't know what my sister did but what felt like five minutes later I was roused up by Helen. "Ryan, Ryan get up," Helen was rocking me while sobbing. "What the matter?" "I'm late." At first I had no idea what she was on about then when sleep disappeared I knew. "OH! Are you sure?" "Of course I'm f*****g sure," Helen was in tears at this moment. "What are we going to do?" "Nothing we can do is there" I couldn't think I was in utter shock. No way could I have got my sister pregnant. The next few days were pretty heated between Helen and me. We clashed about everything and pretty much loathed one other for getting ourselves into this mess. I went to the stores and grabbed a pregnancy test. Funnily enough the shop attendant said "good luck." She wouldn't be saying that if she realized it was because I f****d my sister. I got home and delivered it to my sister. At first she didn't want to do it, but then she unwillingly went into the toilet. The next few minutes were torment. So many scenarios were racing through my thoughts, none with a nice ending. What seemed like a lifetime helen stepped out of the toilet with a complete shocked expression. "It's negative," Helen grinned. "I'm not pregnant" I rushed up and gave my sister the biggest hug and kiss ever. I don't think even my wedding day can ever beat how joyful I was in that moment. But it did made us think. We concluded that enough was enough and reluctantly agreed not to have s*x anymore. Neither of us was delighted about this decision but it was the proper thing to do, we are still brother and sister after all.