If you would have told me this morning I would be fucking my sister by the end of the day, I would have looked at you like you were crazy. Not that it was a crazy idea, just an unexpected one. Jill and I are 17 and happen to be twins. We also have been as close as brother and sister can be. We were also raised in a pretty sexual liberal household by most people’s standards so it wasn't unusual for us to walk around in front of each other wearing very little or nothing at all. It happened two days before Christmas. Mom and dad left early to go to a private party leaving Jill and I home to entertain ourselves for the night. A fire was roaring away in the fireplace and we sat on the floor playing games on the x box. There was friendly competition happening and as the room started to get warm from the fire, we found ourselves stripping down to just our underwear to cool off while we continued our game. Jill was stripped down in her skimpy black panties with the pink trim and matching bra that I have always loved seeing her in, and I in my boxers. As the game progressed, the competition grew fiercer and the room grew louder. "Hey! You are cheating." Jill yelled. “You are just a sore loser." I laughed. She then reached out and slapped my arm then proceeded to wrestle the game controller away from me. The more she tried to pin me, the more I laughed and I have to admit this wasn’t the fist hard on my sister has ever given me but I was growing more aroused by the second. I don't think Jill was aware of it quite yet but she finally managed to climb on top of me in wrestling pin fashion as I was lying on my back on the floor. Usually I would put up more of a fight but with her sexy petite five feet two frame, I couldn't resist letting her win. She grinned down at me as she straddled my body but her smile turned to surprise as she sat back and then felt the head of my hardness finally when it was poking her in the crotch of her panties. She looked down between her legs and saw my cock was poking out the fly of my boxers. She smiled once again then surprised me by reaching down between her legs and pulling the crotch of her panties aside and sliding her wet pussy down onto my dick. Surprisingly even with our up bringing, Jill and I have never had sex and until now, I can’t recall giving it much thought. I was amazed that she was brazen enough to finally do it but I was more amazed at how tight she was. “Are you sure we should be doing this?" I asked as I thrust into her- repeatedly feeling the wet heat from her pussy caressing me." I don't mind if you don’t" she whispered with a sexy yet satisfied moan while staring hungrily into my eyes. Still sliding up and down on my dick, Jill reached up and undid her bra and let her beautiful firm teen tits fall free. Her nipples are dark brown and very erect and were illuminated beautifully by the only light in the room which was the glow of the tv from our now forgotten game and the warm glow from the fireplace. I have seen her beautiful perky young tits many times and I have admired them each time but I have never seen them looking so stunning, tanned and almost translucent bathed in the glowing light as they are now. As I continued to thrust, I reached my hands up and caressed each of her soft milky globes while occasionally tweaking her erect nipples. Her moans grew louder while she met me thrust for thrust really getting into it. After several minutes with her on top of me, I grabbed her ass cheeks and rolled her over to where she was now on her back and I was on my knees between her legs. With the single quick motion, my hard dick never left the inside of her pussy. She squealed in delight as I was now fucking her missionary style. Her legs were raised in the air while my hands gripped both of her ankles. As I looked down between our legs, I could see my dick sliding rapidly in and out of her beautiful snatch. She was clean shaven except for the small tuft of jet black hair she kept neatly trimmed just a couple of inches above her clit. I have also seen her pubic mound many times before but always found her style of grooming to be incredibly sexy. Jill soon went stiff and started to shudder as she let out a loud squeal and started to orgasm. I then started to feel myself quickly approaching my own orgasm when I picked up the pace a little bit." I am going to cum Jill. This is all kind of sudden, I never brought a condom." "Please cum inside me Aaron. Mom put me on birth control ages ago so it's ok." That was all the words I needed to hear. As I tensed up, we heard a loud crack of thunder and a brilliant flash of lightning bathe the inside of the room surprising us both before the power went completely out. It could have added to the intensity of the orgasm but I came like I have never came before. My cum was filling her pussy in spurt after intense spurt before we collapsed sweaty and spent. As we lay on the floor catching our breath, we talked briefly of what had just happened as the power was still completely out. The only glow now remained in the still crackling fire. “I can’t believe we actually did that.” I said softly while caressing Jill’s naked abdomen. Her small fingers wrapped around my dick that was still semi erect and still poking out my boxers. “I can’t either but I think it was a long over due. Do you have any regrets Aaron?” I looked into her big beautiful eyes and replied, “None at all. I am very glad it happened because I love you and I have always been a big fan of your body.” Leaning in, I kissed her passionately on her small pouty red lips. She responded by leaning in, wrapping her arms around my neck and returning the kiss. Her firm breasts pressing against my chest felt incredible as my hands found their way to her tight little ass and I gently squeezed. Our loving embrace was momentarily disturbed though by the sound of my cell phone going off. I forgot where it was sitting but Jill found it first as she sat up and handed it to me but not before looking at the display. “It’s Mom” she said as she handed me my phone. “Hi Mom. How is the party? Is everything ok? By this time the rain was really coming down in buckets and the wind was sounding fierce. “Everything is fine Aaron. The party was a lot of fun” replied Mom. “Dad and I were just on the way home and the road is blocked by some fallen trees because of the storm. We had to turn back around and go back into town. We will be getting a room for the night so we just wanted to let you know. How about you and Jill? Are you guys doing ok?” ‘Yeah Mom, we are fine. We were sitting here playing vids and the power went out just a little while ago. We will be fine tonight, just make sure you get out of this storm ok? Love you Mom.” “What’s going on?” Jill asked out of concern. “Mom and Dad were on their way home but couldn’t get any further because of some downed trees so they are going to turn back around and get a motel room for the night. It looks like we are on our own tonight.” I got up and left the room for a minute." Where are you going?" Jill asked. “Well, I figured if the power is out and we are on our own for the night, I may as well get some things to help us out." I returned shortly carrying our huge inflatable mattress a couple of pillows and some blankets. I was not really surprised to find Jill had slipped off her panties in my absence and was now sitting Indian style completely naked in front of the fire. “Good idea." She said. Still standing, I got out the mattress from the carrying case and the foot pump to start blowing it up. As I did this, Jill scooted over, gripping the waistband of my boxers and slid them all the way down exposing my semi hard dick once again. I helped her by stepping completely out of them so we both were completely naked. She then took hold of my dick and wrapped her lips around it taking my length down her throat. As I was blowing up the mattress, she was blowing me. Her mouth was so warm and wet as she sucked my dick like a true champion. I have never had a girl suck me before until tonight but she apparently had some practice and I was enjoying every minute of it. I was figuring that by blowing up the mattress while she was doing her thing, I would last longer with the distraction. Almost done with my task, I felt the familiar feeling of my balls tightening. “I’m going to cum again Jill!" She kept her lips wrapped around my shaft while pumping me with one hand. Her other hand caressed my balls as I unleashed my milky cum into her throat. I was surprised she took every drop without any problems as she then looked up at me with those big green eyes and grinned. By now the mattress was fully inflated. I stood her up, took her into my arms pressing her hot soft body to mine and kissed her like lovers. Our tongues swirled together and I could taste myself still lingering in her mouth. Gently I lay her back onto the mattress letting her legs dangle slightly over the edge I got down on the floor on my knees between her and spread her legs apart. Her pussy was the most beautiful and inviting thing I have ever seen and I couldn't help staring at it for a moment to admire it in all it's perfectly trimmed glory. Parting her lips with my fingers, I could not only feel how wet she was but I could see the moisture glistening from the glow of the fireplace. I ran my tongue up and down the center of her slit, tasting her delectable juices as I went. My tongue tracing an outline around her lips before it found its way inside of her. I tongue fucked her for several minutes before withdrawing. Her breathing was now very rapid and she arched her back off the mattress when I replaced my tongue with my finger and commenced to sucking on her clit. By now she was so wet; I went from finger fucking her with one finger to inserting a second and a third. This sent her over the edge and she gripped my head with her knees and cried out "I'm coming!!" Her creamy juices coating my face as I lapped up as much as I could. I let her catch her breath and then took her by the hand and led her back down to the floor where I positioned her on her hands and knees. Kneeling behind her, I placed the head of my long hard dick at the entrance to her pussy and slowly guided myself in. She rested herself on her elbows with her tight little ass sticking straight up in the air. I heard a slight moan echo from her as I entered her. She now grabbed handfuls of carpet as my hands gripped her slender waist for support. Her wet pussy felt incredible as I slid in and out for several minutes. I knew I was getting close and then she straightened up, raised her arms and held my head in her hands. My arm now wrapped around her waist while my other hand caressed both of her tits while I continued to fuck her from behind. It wasn’t long before I felt her tense up once again while still wrapped in my arms and I held her tight as she came. Feeling her body shudder was too much to handle as I buried myself as deep inside her as I could and filled her with my cum. As she caught her breath once again, she took my arm that was wrapped around her breasts and brought it up to her mouth and sweetly kissed my hand. Judging by the clock on my cell phone, I saw that it was well after midnight. Jill and I had a most enjoyable night that we would not forget for the rest of our lives. We left the fire burning in the fireplace and laid the blankets and pillows on the air mattress as we both climbed in to go to sleep for the night. The room a soft glow and the only sound was the storm still kicking up outside. The rumble of a distant thunder would echo occasionally but it only added to the atmosphere of the evening for us. It wasn’t long before we both drifted off to sleep with our naked bodies pressed against each other. We must have been exhausted because we both fell fast asleep and even though it felt like we had been sleeping for hours, we were both in the same position as we were when we drifted off. The thunder and the storm seemed to have died down finally. Jill was still fast asleep but the glow of the TV from the power coming back on caught my attention. Against my better judgment, I released my hold on Jill's delectable soft and warm body and quietly got out of bed to shut the TV off. I also noticed the fire looking pretty low so I added a couple of more logs before climbing back into bed to reclaim my position against Jill. As I quietly got back into bed, Jill was laying on her side with her back to me. She let out a contented sigh as I snuggled into her back and placed my arm around her once more. Moments later while enjoying the quiet and the moment itself, my cock became erect against Jill's taunt little ass. She appeared to be sleeping but my hard on didn't go unnoticed as she started to wiggle her butt against my groin until my hard shaft worked its way between her legs. When she got it where she wanted it, she rocked continually back and forth on it so my dick was gliding between the folds of her wet pussy lips for a little while. I suddenly felt her hand grip my cock as she gently stroked me when I would exit on the front end of her crotch. When she reached maximum lubrication, she gave a slight twist of her hips so the head of my cock found her entrance. I met her by sliding in the rest of the way while reaching my hand around in front of her to massage her clit as we fucked once more. This must have been doing the trick because she started bucking wildly while having her orgasm. I thought she was going to snap my dick off inside of her as violently as she was slamming back in to me but I kept time, never losing rhythm with my hand until she finished. Soon after, I was still humping away as my dick tightened up and started to spurt deep inside of her again.” Good thing mom put her on birth control." I thought to myself.