Day One in My Sister’s Body

"Be good!" was the last thing I heard as the front door shut, signalling the beginning of my week of freedom. My name is Jay, I'm a 25 year old dude freshly finished a finance degree but honestly after feeling burnt out from the grind of exams I wasn't in a rush to get out into the job market. My sister Kim is 19 and just starting out next semester, her and my parents have just left with all her stuff on a week long trip to help move her into her dorm.

I'm a pretty well built guy, I like to take care of my body, so you might be wondering why I wasn't asked to help with the heavy lifting but therein lies the twist. The power to swap bodies has run in my family line for generations, we've been good about keeping it a secret from outsiders so nobody but direct family has found out so far.

"Safe travels, is Kim not going with?" "Thanks Mike, no we're going to move her stuff and she's going to follow along later" I hear my dad explaining, slightly exasperatedly to our neighbour through the door. Mike is a balding middle aged bachelor who has lived next door since I was a kid, he's a bit creepy and I've caught him eyeing up mom and Kim a few times but he seems mostly harmless. He basically lives in a dirty white tanktop and sweats and his house is a bit of a mess but surprisingly he's a very good handy-man and does a lot of work on our house for free(probably to ogle at the women).

Walking from the front door I stop at the full length hall mirror and take in Kim's body. Kim didn't give too many ground rules for the week, she mostly wants me to keep up with her gym schedule and do some tanning so she's bronzed for the first week of college. Even though she's my sister I have to admit, Kim is gorgeous. She has long blonde hair, blue eyes, big lips, tiny waist, a little short around 5"2 but looks like a model. She keeps herself in great shape which makes her perfect C-cup breasts stand out even more and a fantastic ass built by squats. One of the side effects of being in someone else's body I've noticed is the longer you're in there the more of their psyche bleeds into yours, as I hear the car pull away my focus is drifting from her sexy features to noticing her slightly pale skin, which means it's time to go lounge in the sun by the pool.

Stopping into her ground floor room to look for something appropriate was a challenge, she keeps it like a pig-stye. After a few minutes of digging all I could find was a couple of one-pieces which would be no good for tanning and a bikini that looks like it was more string than fabric. After stripping off I took a minute to get a feel for my temporary body, running my hands along my neck and chest. As my fingers ran across my new breasts and reached my nipple I felt a little flutter, I don't remember Kim being so sensitive last time I was in her body but that was a couple of years and some development ago. I kept one hand caressing my breasts as the other ran gently down between my legs. It's takes some time to get used to the emptiness down there but as my finger traced the outside of my folds my breathing was getting a bit heavier. I explored with one finger until I brushed against my new clit which caused my breath to hitch. As I was getting wetter I brought my other hand from my breast down to start fingering myself as I rubbed my clit. Women's pleasure was such a different ballgame to men's, I could feel the orgasm slowly beginning to swell as little moans escaped my lips. My eyes closed, lost in the mounting pleasure, unaware of the world around me as my breathing got faster...*thud*, a loud sound snapped me out of my stupor.

I got up and peeked out the window and couldn't see anything unusual but a bit of wetness on the ground, a bird probably flew into the window and hurt itself. I was riled up and a bit frustrated to be interrupted but I'd lost my rhythm. "God damn it" I thought. "I'd better make the most of the daylight hours". The last time I had a chance to do something like this the orgasm was much stronger after all the build up so at least I had that to look forward to later.

I finished attempting to tie the bikini ties, grabbed some lotion and headphones and got settled in outside. The day was a scorcher so I had to make sure I was thorough with the lotion, cursing that I didn't think to put some on before the bikini I managed to work my fingers around it without messing with the ties too much. Doing my back was the worst despite Kim being much more flexible than me. After a little more light teasing of my body I settled in, closed my eyes and listened to a podcast while the sun did it's work.

I must have zoned out and didn't realise the time passing but I heard another thud that woke me up, this time coming from inside. As I sat up in the chair, Mike was in the kitchen, dirty tank top and all. He gave me an awkward wave and ran to the back door, "Hey sorry Kim, I was just doing some work on the cabinets your dad asked me to look at I hope I didn't startle you". His eyes were leering and he was fidgeting but from where I was sitting I couldn't see much of him behind the door, I don't remember my dad mentioning anything wrong with the cabinets either. "Don't worry about it Mike, let me know if you need a hand with anything". "Well I might take you up on that" he said, not directly to my face but I couldn't really blame him. "Is there anything I can help you with, you want a drink while I'm in the kitchen?". The heat was getting me a bit parched so I could definitely do with a drink. "That'd be great thanks, could you get me a lemonade?". With a grin he stepped back inside and came back out with a pitcher of lemonade in ice and a glass. I took a quick sip and instantly recognised the sharpness of vodka mixed in. I wasn't planning on drinking this week since Kim has never been much for underage drinking but it's the first time I've had the house to myself since I got back from college so why not indulge. "I won't tell if you don't" Mike said with a lecherous wink and I gave him an awkward smile back.

I turned to put my glass on the table when Mike said "Oh I can see a red spot starting to show on your back, let me help you with the lotion" as he rushed to the bottle, fumbling hands nearly dropping it in his haste to get started before I could answer. I'm not thrilled about it but Kim would kill me if she came back to sunburn so I turned around and lifted my hair out of the way as he warmed the lotion in his hands. The smell of sweat coming from Mike wasn't ideal but as he got started it looks like he really knew what he was doing. He started at the top of my neck, moved down to my shoulders then along my back in what was turning into more of a massage. To my surprise it felt really good so when it started to go on longer than it should I just shut my eyes and let him work. I noticed the longer it went on the more brave he was getting, his fingers brushing the top of my ass and as he worked his way up my back his finger tips were brushing the sides of my breasts, then at the top of my shoulders his fingers started to drop down my front towards my cleavage. I felt realised my breathing started to get a bit heavy causing my tits to rise and fall closer to his finger tips, that's when I snapped out of it. "Thanks Mike I think I can take it from here" I said, a bit breathy, as I grabbed his hands and moved them away. As I turned and he stepped back he was definitely sporting some wood but he's only human and Kim is hot as hell. "No problem, any time you need a top up just give me a holler" he said as he stumbled back to the kitchen, trying very unsubtly to hide the erection.

After heating up a bit from the massage I really started to feel the thirst so I refilled my glass and started working my way through the pitcher. When the sun is this hot a drink like that just hits so nice and it wasn't long before I was draining a second and a third. As the third went down it definitely felt like it was time for a bathroom break. Old college muscle memory must have kicked in because it didn't occur to me that Kim doesn't have the same aptitude for drinking especially not at speed and I stumbled a little standing up. "Damn I'm a cheap date" I joked to myself as I made my way inside.

Mike was standing just at the door as I came in and, misjudging the step into the kitchen, I stumbled again and this time directly into him. I reached out a hand for support and grabbed what I could, which unfortunately because of my new shorter height was Mike's waist and a handful of bulge while at the same time his hands went suspiciously accurately to my chest. I could feel a good bit of meat through his sweatpants, good for you Mike, as I stabilised and got my bearings back. "Oh my god I'm so sorry" "Oh my god are you ok?" we said almost simultaneously, though his hands lingered a bit longer than mine did. "So sorry Mike, the drinks have gone to my head a bit quick. I'm just running to the bathroom". "No problem at all, actually when you're back could you give me a bit of a hand with these cabinets?". "Sure, back in a minute." I said as I much more carefully made my way to the bathroom.

After a quick pee and some dabbing of the wetness I'm hoping was from my solo playtime, I stopped to take stock in front of the mirror. In my own body I could tank a few lunch beers with the boys and still be fine for my next lecture but right now my head is feeling light and my face is looking a little flush. I splash some water on my face to see if I can cool down a little and end up with some of it running down onto my chest, which reminds me of Mike's hands grabbing, which makes my nipples turn hard. "Is this body really getting hot at the idea of creepy Mike?" I think desperately, as I start wiping water off my tits, spending a little more time around the nipples. "I need to get rid of him, I'll help him with the cabinet then tell him I have to do some college prep and fuck myself silly with the vibrator Kim hides in her drawer once he's gone". I readjust my bikini top, take a deep breath and head back out into the kitchen.

As I come into the room I can see Mike fiddling with some tools, I've never been the handy type so I have no idea what he's working on. "Come on over a sec, I need you to hold this cabinet door while I work some magic" he said, signalling to one of the top cabinets above the sink. I'm not exactly tall in this body so I bend over and pull over a little step-stool, being careful not to tip over in my woozy state, and step up to hold the door. Once I got in place I felt Mike slip up behind me and reach over me to do something to the hinge, his belly against my back and his breath on the back of my neck. He probably could have done this standing beside me but as I felt the beginning of a hard-on forming against my ass my body started to feel hot again, I didn't want to prolong his stay and just needed him to finish quickly.

He started putting a bit more force into the hinge and as he screwed his body started to thrust forward, pushing his cock up against my ass harder and causing his breath to get heavier on my neck. My nipples hardened again as I realised my hands were raised to the cabinet door, arms squeezing my tits together in a pose I'd only seen on pornsites. I glanced over my shoulder and caught Mike staring straight down at them, his face was red and sweating from exertion as he pretended to be looking back at the hinge. He finally started to step back but as he did the string of my top got caught in his tool, untying it and exposing my tits! In my panic to cover them I let go of the door, lost my balance and fell backwards off the step. As I did I turned and reached out to Mike, knocking him over in the process and we fell flat on the kitchen floor. "Woah are you ok little lady?" Mike said, not moving an inch. It took me a second to get my bearings and realise why, my face was right in his crotch, cheek rubbing against his cock. "Oh my god I'm sorry I'm so clumsy!" I said, lifting myself to my feet and trying my best to help Mike back to his. "I'll never complain about a pretty girl falling for me" he chuckled, breathing heavy and staring straight at my still exposed tits. As I'm scrambling to fix my bikini top I can see his hand on his cock through the corner of my eye and a growing wet spot on the front of his sweatpants. I really need to get him out of here so I can deal with this, "Is this how horny drunk girls always get or did he slip something in my drink?" I thought, unknowingly caught still staring at his cock.

Mike smirked through his panting and said "Just one more thing I need your help with before I can let you get off, I need someone petite who can get in under the sink and let me know if there's a drip". "Almost over, ok no problem I can do that" I thought as I got down on my knees. Sticking my head under the sink, I couldn't really see much as I was waist deep. As I saw the shadow of Mikes form step over me I heard him tapping something on the sink, "nothing yet" I said, "The only thing dripping is my pussy" I thought to myself, getting a bit lost in the idea of finishing myself off later with Kim's vibrator.

Before I knew it Mike had forced himself in under the sink on top of me, hands reaching for a pipe and rubbing against my tits as he passed. An involuntary moan left my lips as he brushed my nipples, I desperately hoped he hadn't heard it but the press of the bulge against my pussy suggested otherwise. All of a sudden Mike twisted something on the pipe and water started spraying directly into my tits and down my body. We both slipped as I scrambled to get away and he landed flat on top of me, cock pressed to my pussy only separated by a now soaking wet bikini bottom and his wet pants. At this point my whole body and hair were soaked as well as my soaking pussy which was desperate to be filled. Mike twisted the pipe again and in the scramble we got turned around face to face, the pressure of the water having forced off my bikini top as my naked breasts pressed into his chest, his pants had somehow pulled down in the scramble and were around his ankles exposing his massive cock which was trapped between my legs, rubbing into my mound and sending me into a mental frenzy as his breath heaved into my neck.

This is way too much, I can't take this teasing anymore, the deperation is taking over. Staring at the middle aged man right in my face, his belly sticking out of his tank top doing nothing to keep his protruding cock from rubbing against my pleading pussy I'll take anything that can fill me. "Are you ok?" Mike tries to say but I cut him off mid sentence, my lips smashing into his as my hand races down to angle his thick cock. "Shut up and just fuck me please, I need this" I say as his shocked expression is replaced by a lecherous grin. "I knew you wouldn't be able to resist you little slut, it was only a matter of time" he said as his mouth latches on to my neck, saliva dripping as it moves down to take in my heaving tit while he positions his cock over my slit. His words are the last thing on my mind as I feel the head of his cock start pushing it's way inside, my tightness offering no resistance to his thick meat as he slams himself to the hilt in one hard thrust. Between his weight pressing down and the force of his entrance the wind was knocked out of me completely, it was all I could do to whimper as he filled me up so completely, pulling out quickly just to slam his full length back inside.

"Such a teasing little whore, just like your mother. I bet you get off turning on guys like me and leaving me blue balled to take care of myself" he panted, not letting up the pace as he pounded into me. This guy clearly has issues but right now the only thoughts in my head are how perfectly filled up I am, the feel of his balls slapping against me, his pubis rubbing against my clit and how close I am to cumming. I still can't catch my breath fully to respond, this degrading talk seems to get him going and I've gotta be honest it was doing a number on me so all I can do is nod and whisper into his ear "I've been teasing you on purpose so you'll fuck me like your whore" as I wrap my fingers into what little hair he has and pull his face down to my chest. He takes the hint and seizes one of my nipples between his lips and sucks as much of my tit into his mouth as he can, the sensitivity has my mind reeling and I can feel my body racing towards orgasm. "Please don't slow down, I'm so close, please make me cum I'll be your little slut" I panted as his kept thrusting, pounding to the full depth of me, slamming into my desperate pussy, the only sounds in my ears are my own sisters voice degrading herself, begging, the slurping of his mouth on my breasts and the slapping wetness of his thick hard cock. I can feel the point of no return, the build up is too immense and the pleasure too much to bear. "Yes, yes, YES,YESYESYESYES" was all I could manage as the orgasm hit. The feeling was next to nothing, a complete sensory overload, all I can do is let my head fall back as waves and waves of pleasure roll over me. Staring at the underside of the sink all I can see is stars, my mind in complete shutdown, I can feel my legs vibrating uncontrollably.

My brain seemed to only be half functioning, it took a moment to realise the weight had left my chest, the fullness of Mike's prick gone leaving my twitching pussy begging. The next thing I knew I was being lifted up onto Mike's shoulder, he spent his life working with his hands so the strength shouldn't be surprising but the ease in which he could throw me around rolled around my almost empty head for a minute. Next thing I felt was the arm of the couch under my stomach as Mike throws me down over it, my body not yet responding all I could do was try keep my balance on it while Mike fumbled at something around my leg. It took a second to realise he had pulled the remains of the stringy bikini bottom off from around my leg as he grabbed both of my arms and tied them together behind my back.

Finally coming back to my senses, I test my arms and realise Mike must be practiced in knots because I couldn't move them an inch, every attempt only making my hair fall over my face and my tits rock back and forth. I can hear deep breathing and chuckling coming from Mike as I turn my head to see him enjoying his work. He reaches out his hand to stroke my now sensitive pussy when I hear a cracking sound and a flash of pain on my ass. "Ahhhhh" escaped my lips involuntarily, much closer to a moan than a sound of pain. "Please Mike, I'm still so sensitive" I begged as another cracking sound hit the air. "Bitches like you are all the same, you had your fun now you don't want anything to do with me. Well I'm not finished little lady" he said, as his cock traced my folds. For a terrifying second his head brushed against my ass before moving back down and plunging back into my sensitive wetness.

Once again Mike started going to town on me, somehow the angle gave him access to get what felt even deeper than before, the force of his thrusts slamming me into the arm of the couch as he held my roped arms for leverage. What started as oversensitive pain quickly turned into mounting pleasure as I felt the waves starting to lap again. "I knew you weren't finished" Mike panted, "This sexy body was made for my cock and I want you to beg for it. Beg for it and apoligise for keeping it from me for so long". "I'm so sorry, I'm sorry I missed out on this cock, I'm sorry I've been teasing you when we should be fucking" came out of my mouth staccato as the only thing in my head was the pleasure of his cockhead on my G-spot. "Oh Mike I need your cock...uh, ah, ah, ah...please" I cry as he impales my pussy back onto his thick meat. The waves of pleasure were flooding in and another orgasm was on the way and at the same time I could feel his cock beginning to twitch, I desperately started pushing my thick ass back onto his dick in a race to finish. "Here it comes baby, I've been saving this load for you, tell me you want it" he roared over the slapping of skin and my own desperate moaning. I could feel one of his hands wrapping itself in my hair as my neck was pulled back far enough to see the hunger and anger in his eyes. "Fill me up, cum in me I need to feel it, please don't make me wait I'm begging!" I screamed. Another few thrusts and I could feel his twitching cock explode inside me, flooding my pussy with his cum, putting me over the edge as I screamed through my orgasm. Mike's desperate thrusting slowed, his breathing ragged as he held my twitching body to keep me from falling. My head was empty, my vision swam as I feel myself fall into unconsciousness..