Based on a true story
My sister and I had always had a great relationship. I was the younger "protective" brother and she was the older "troubled" child that always had me on my toes. You see my sister and I were the only ones we could count on after my dad died in a plane accident. My mother was a local gynecologist, and always busy with patients and rarely at home. So that left my sister and I with a lot of time together to talk and lounge around until mom's arrival.
One afternoon, Amy confided to me that she thought about sex all the time. Anything sexual was never too taboo for her to discuss with me, after all I was the one who often kept her out of trouble. Amy at the age of 22 attended a local community college, and I was 18 and in my senior year of high school. My sister was a tease and sometimes wore clothing in the house that would get my attention. One Friday after school, I was coming up the stairs when Amy appeared out of the master bedroom wearing moms favorite white teddy. I tried to look away but couldn't when I noticed the teddy had what I called "see through fabric". I could clearly see the outline of Amy's bush with her D cup breast matching her thin waistline and wide hips like a goddess. Her nipples pushed into the fabric catching my stare and her aureoles were the size of a tennis ball. I asked her what she was doing and she simply said "nothing, just wondering what it would look like".
On days when mom wasn't around we would often play games to pass the time. Monopoly, chess, and cards were some popular ones, but playing doctor was our all time favorite. In the house mom had a spare bedroom made into a examination room for the interns she taught. Having real equipment to play with made it exciting as I played Doctor Ryan wearing my white jacket, and Amy wearing shorts and a tank top played the patient. I would get Amy's height measurements at 5'5" and then look at her throat and ears on the examination table. With a full report making sure she was in top running order, I tried to keep things at an innocent level.
One day I had Amy on the table fully clothed when I was checking her heart rate. The stethoscope was getting stuck on her low cut blouse and her huge tits weren't helping. As we were just playing, I was almost ready to skip to the next part of the examination when Amy said "doctor shouldn't you just have me take off my blouse?". I looked at her in disbelief, knowing that mom could be home at any time.
I said to her "what if mom would catch us?"
She replied "I'll just run to my room if she comes home its right down the hall."
With a reluctant "OK" I helped Amy off with the blouse and put it on a chair next to me.
It was the first time I had ever seen Amy's bra covered tits other than in the white teddy and it was always a jaw dropping experience.
After hearing her quickening heart rate and getting more nervous about being caught, Amy said to me "doctor isn't it time you checked my breast for lumps? After all I don't think we did that on my last visit."
Looking nervous I reached for my clipboard to act like I was actually reading the last time I did a breast exam to clear my head and decide if I wanted this to go on.
Amy again spoke up after clearing her voice " doctor without my bra on."
I timidly agreed and reached around her back to unclasp the huge boulder holder while holding onto my thoughts of what would happen if mom saw the two of us like this. There were 7 clasps undone and the bra still didn't unfasten. I had some girlfriends who had maybe 4 clasps but never this many. Fearing I had lost my touch, I looked up at my sister waiting patiently for help. Amy just smiled and said, "silly you almost had it" and she removed yet another garment after undoing the final clasp.
I was taken back as my sisters breast were freed from their confines and brought to my unabated gaze for the first time. Her nipples were perfect her globes of flesh were so firm you could knock golf balls off the top of them. I looked them over for a long period of time when Amy interrupted and said, "are you going to feel for lumps or what doctor?"
"Of course" I said, "what kind of doctor would I be if I didn't?" My hands roamed around feeling her huge milk makers and paying special attention to her pencil eraser shaped nipples. I don't know what came over me at that moment, but I bent down and sucked on both nipples, fully expecting Amy to end our play time together. I looked up and was really fearing the time as moms arrival was sure to come when Amy spoke yet again with another medical question, "do I feel warm to you doctor?"
I replied "I'm not sure, I think to be careful we should take your temperature" I looked around the room and sure enough there was moms glass flask full of mercury thermometers and soaking in alcohol. Funny I thought, I always use the digital one and can't seem to find it. Amy must have moved it earlier. I approached Amy and presented her with a thermometer and tried to insert it in her mouth.
"Yuk! That's not the way doctors do it" she shouted topless and naked from the waist up.
"Excuse me, but I'm the doctor and I think I would know how to take a patients temperature."
She looked at me with that naughty smile and said, "that's not what I mean, you see there are two colors of thermometers in the flask red and blue. The blue ones are oral and the red ones are anal. Your holding a red one and you know where that goes right doc?"
I grinned, "well maybe you should decide where your temp is to be taken, close your eyes and choose a thermometer from the flask Ms Ryan" I stated as professionally as I could.
Amy closed her eyes and although I saw her peek, picked out none other than a red thermometer.
"Sorry" I said. "I'm afraid I'm going to need you to assume the position on your hands and knees with bottoms up. Looks like it's your unlucky day."
My sister looking brave said "I guess that depends on how you define unlucky."
Amy laid back on the examination table and watching her tits flop to the sides of her chest, I began undoing her belt on her khaki shorts while looking down at my own rocket cock trying to launch its way out of the silo. Amy assisted by lifting her bottom to help me slide her shorts off along with her shoes and socks.
Gazing at my sister on the paper covered table that made a distinctive crinkling noise, I made my way over to the cabinet where latex gloves and KY Jelly were stored. After being satisfied that there was enough KY on the thermometer, I came back to my panty covered sister who had turned over and assumed the position with her ass to my full view. Anticipating my first look at her naked bottom, I grabbed the elastic of her pink cotton panties and began nudging them down. Amy resuming her role as patient stopped me and loudly stated, "I know this isn't a good time doctor, but I've heard you are writing a book about the female anatomy and looking for research am I right?"
"Yes.....yes I am Ms Ryan", I said dying from expectation.
Amy looking over her shoulder with a look of someone about to have her temperature taken up her ass replied, "well it's OK with me if you use your camera and camcorder over there to record my examination for your medical research to complete your book if you want to."
Thinking of the possibilities of sending my friends e-mail attachments with pictures of my sisters naked pussy, I realized I should hurry up and take the porn pictures before she changed her mind. "Great idea Ms Ryan, but I should make you aware first that a lot of people are going to see these pictures in my new book, people you may or may not know."
My sister now rubbing her panties into the lips of her sex looked back again and replied "may I know some examples of whom may see these pictorials doctor?"
Quickly I said, "Well I do have some colleagues whose names are notorious in the gynecology field, like my friend Dr Livingston (aka best friend), Dr Cape (aka second best friend), and maybe just maybe Dr Lilienthal(aka my sisters best friend)." Testing the waters as my sister has told me countless times she is bi-curious.
"Yessss" My nympho sister said as if a shocked doctor wasn't there, "not only do I know all those doctors but you can show them to others as well if you want. I trust you Dr. Ryan. I'm all yours to display to the medical community and the eyes of professionals like yourself."
Thinking fast I said, "Can I have copies made for my wallet, you never know when reference anatomy pictures would come in handy to show to others."
"Anything you want doctor, including a full pictorial for self stimulation maybe or to add to a closet wall or a screen saver on a computer. Amy caught me by surprise by referring to the back of my closet where several well placed Playboy centerfolds are hanging that my mom hasn't found yet.
In view of how far my sister was in sexual pleasure, I thought it best to try out my good fortune again, "Ms. Ryan with your permission and signed consent, I would like to post your medical pictorials on the internet and give you the profits from their sale. Would you agree to that?"
Impatiently Amy cried out "all that sounds great now let's take my temperature and continue with this discussion later shall we". Positioning the HD camcorder and bringing the Cannon SLR digital camera into arms reach, I began to dwell again about all the ramifications of what I was doing and what mom would say if we were to get caught. Getting the best possible ass and pussy camera shot, I began pulling the sides of Amy's panties around her flared shaped hips in the hope that she wouldn't interrupt me again.
Sliding her panties slowly down to her thighs, Amy displayed her untouched furry fuck hole to me for the first time. I picked up the SLR and as on cue, she took two of her sexy fingers and opened her womanhood to my camera's gaze. I noticed a wet spot at the entrance to her slit and an odor that I can only describe as sweet.
"I can't wait till we show the tape to everybody whom is helping with the research. Do you think they will like it?" My sexual vixen cried out.
"I'm sure they will Ms Ryan because you have a beautiful vagina. Lets remove the panties fully so I can view your pussy easier with the camera shall we"
Amy hurriedly removed the rest of her clothing and naked bent over and spread her pink gash more fully for my viewing pleasure. "If it's OK with you doctor can we use the technical term for my vagina."
"Sure thing" I said while hitting the shutter button of my Cannon Rebel to record the event.
"I think you should refer to it as a cunt, don't you agree Dr. Ryan"
"Yes Amy that sounds nice, cunt it is".
Wanting to move on I put away the camera and loosened my top polo shirt button. Looking into the view finder, I adjusted the camcorder to view as much of my sisters naked body as possible. Gently I took the thermometer and placed it on Amy's brown flexing hole to prepare her for the intrusion.
"Are you ready Amy?" I asked.
"Stick it in doc." Amy replied holding her ass cheeks as far apart as possible.
I slowly inserted and held the thermometer in my sisters ass harboring thoughts again of my mom walking in on the two of us. What should we do or say I thought? How could we explain this? Thoughts of us being grounded, thoughts of mom joining in, and thoughts of my life ending as I knew it were all possibilities. Pulling out the thermometer it read 98.6, perfect just like the ass it came from I thought.
"Have you had your prostrate checked lately Ms Ryan?" I asked watching my sisters hand get wet playing with her furry beaver to my delight.
"No could you please doc, I've never had one done and you never can be too careful these days." Amy said while getting us both aroused.
I prepped my latex finger with KY and told my sister to just relax and back up so it would go in easier. She looked back and shocked me yet again, "do your worse doc!"
I took this as an invitation and shoved my finger fully into my sisters ass as she impaled herself on my single digit. "Yesssss" she screamed, bewildering me if she was actually enjoying this or just trying not hurt my feelings and end it. I wiggled my finger in her brown hole and withdrew it taking pride in that another barrier had been torn down between myself and Amy. I began scribbling on my clipboard a note that said in large capital letters, "PERFECT BUTT". I laughed at its symbolism and showed Amy who giggled along with me.
Moving on Amy turned over and let me fire off more pictures of her lovely hot box with a smile to go along with it. I was flabbergasted as she made known to me her next request, "Dr Ryan I heard this is the best fertility clinic around am I right?"
"Yes I believe it is" I told her.
"You see my girlfriend and I are thinking the time is right for me to have a baby, and she told me to come here so you I can try out your special equipped fertility thermometer for my other hole." "You know the one that everyone says supposedly gets girls pregnant" Amy said with a stupid look on her cute face. Thinking about what she just asked, I put her legs up in the stirrups at the end of the examination table and ordered Amy to unfold her hairy love petals so I could obtain photo's of my sisters snatch. "This one's for the internet" I thought to myself with a smile and a click.
Pausing briefly with the camera I said, "This can be done Ms Ryan but I need to know a couples of things first?"
"Sure like what?" My sister said while letting me take more photos of her most intimate parts.
Staying in character I said, "if this doesn't work on you I may need to see your girlfriend for some special fertility treatments to get herself a baby, do you think she's up for that?"
"I know she'll do whatever it takes doctor she wants a baby too"
Rapidly I added "also I may need permission granted for some nude photographs of the two of you for my book, some erotic if that's OK?"
Looking a little distracted at my camera my sister looked up and mouthed "whatever you want doc."
"Great!" I said, "now I need to ask you one serious question before we begin the treatment."
"Go on?" my sister replied.
Thinking of mom hearing the news that my sister was pregnant I had to ask, "are you on birth control?"
Amy looked as if lost in thought for a moment and said in a uneasy manner "No, is that going to be a problem doctor. I mean I am trying to get pregnant you know." Quibbling on and reminiscent of her desire to have sex with me.
"Well you can't be careful enough with the types of diseases that are out today. So I'm afraid we'll have to use the precautionary mode until certain tests are negative. Is that OK Ms Ryan?"
"Yeah, whatever, yor the doc" My disappointed sister winded out.
I pulled out my lucky condom from my wallet that I always had in case of emergencies, and took off all my clothes except for the white lab coat to stay in character. Amy's eyes widened with approval when she saw my cock for the first time. I wasn't huge but 8 inches was not only the longest, but also the thickest from what she told me later .
I was now stroking my rocket when Amy piped in, "you want me to prime your special fertility tool doc?"
Shaking my head yes I stepped up to the examination table and stuck my dick in my sisters mouth for the first time polishing my knob. Trying to imprint every second to memory, I looked up only to realize that everything was already recorded on HD tape. How sweet life is I thought to myself. Look a sister and brother porn star team. I started to think of these silly screen names that all the porn stars have to hide their real ones. For Amy I thought, "Hairyhunny" because she tastes sweet as honey. Myself, "Spaceshuttle" because I've always wondered what it would be like to have sex in zero gravity. Would you ultimately end up bouncing off the walls? I chuckled at the thought.
After several minutes of coming on the brink of orgasm and then the thoughts of mom catching us to bring me back down, I decided to go for broke and complete the act of incest by fucking my sisters hairy twat for the first time.
"Are you ready Ms Ryan I think you have my instrument primed properly?" I said
"Yeah doctor, put your fertility tool in me now" Amy impatiently cried.
I walked around the table sliding the rubber over my hardon and putting on some KY put my cock at the forbidden entrance of incest. Holding Amy's pink hairy folds as far apart as they would go, I gave my sister her last final chance to back out.
She looked me in the eye and said "Do it! Do it now! Make me pregnant with your fertility tool Doctor Ryan!"
Hearing her talk that way made my purple headed prick lose control, and plunge to her womanly depths instantly.
"Time to make you a woman Ms Ryan" I said bringing my cock out and rubbing it on her pubic hairs then plunging it back into her hairy canal.
My sister shrieked and yelled out of character for the first time "Yessssss fuck me brother my body is yours. Order me and I'll show my hairy pussy to anyone you want. I like it when your friends see me like the slut I am. I want to be your personal whore at your beckoning call. I'll call you master and do whatever you want as long as you show my body to your friends." My naked patient decried to me out of breath and in sexual bliss.
Talking like this in the heat of the moment, I couldn't resist getting my sisters complete control while fucking her and I knew once she calmed down she would recant all comments she had just made. So I said in a more businesslike brotherly tone "are you serious about doing anything Amy?" While standing at the end of the examination table and pumping my protected cock in and out of my naked sister.
Calming down a little she looked me in the eye and said "tell me what you want and I'll tell you what I want little brother." As if fucking my nasty sister wasn't enough, bartering was always a way for one of us to get what the other would not give. At this moment I couldn't think of what my sister could want from me since we were already having sex so I laid down my terms of the agreement.
I spoke wisely, " I want to bump uglies with your best friend (Brittany). Tonight if possible in the woods out back while moms asleep". Brittany is 22 years old and my sisters best friend. I have always wanted in her pants since she and Amy became friends.
Amy smiled a evil grin and looking between her legs said "I think I can get her to sneak out"
" Do you think she'll do it?" I asked.
My sister looked up "Yeah she's good at sneaking out."
"That's not what I meant, I'm talking about fucking" I frantically replied.
The next thing my sister told me was something I'll never forget to this day. Impaling herself as far as my cock would go in her she told me in her exact words, "if she doesn't agree to fuck you (which I think she will), I'll help you hold her down and rape her. Promise"
Now it was happening to me as well as my sister when an evil grin appeared on my face, "Do you think she will tell anyone?"
Amy replied "she didn't say a thing when she turned 18 and her mom held her down and let her dad raped her!"
"Get out of town!! I don't believe that!" I shouted while still pumping my man meat inside my sister . Amy looking down at her hairy pussy told me, "that's not all."
"It isn't?" I quizzically stated.
"When I got Brittany to actually talk about it she said she actually began to like the idea so much she helped her mom hold down her sister while her dad had his way with her. Imagine losing your cherry to your dad and then helping him with your sister. Its fucked up and I laugh every time I talk to her about it, that family has been into incest ever since. Incest is the best!" My sister chanted.