DISCLAIMER:- The following text is sexually explicit and contains depictions of sexual acts that have been classified by the surgeon general as potentially dangerous and unhealthy. You must be a broad minded adult to read the text, and you must not make this text available to minors or to any person who does not wish to view it. Unprotected sexual relations with unknown partners is hazardous and we urge the use of condoms and safe sex at all times.

No matter how much we tried, my wife and I simply could not have a baby. It seemed she was incapable of becoming pregnant. As it turned out, while I was capable of manufacturing enough sperm, their mobility was poor. Luckily, my sister Amy, a licensed doctor specializing in the field of fertility, was very interested and eager to help. For a number of years, under her guidance, we tried all the usual practices. We had sex in various positions, especially during her most fertile times. She would lie for hours afterwards, in a tilted attitude, while gravity assisted the sperm in reaching its destination. Nothing worked.

Finally, sis suggested artificial insemination. Quite frankly, I wasn't wild about the idea, but we wanted a child so bad that we were open to any suggestion. Amy arranged every thing for us. As far as she was concerned, her entire clinic was at our disposal.

Finally the day arrived. My sister was busy in one of the examination rooms preparing my wife for her insemination. I on the other hand, was led into a chamber where I was supposed to produce my sperm. I was told to change into a comfortable robe, and was given a small vessel to ejaculate into. The problem was, me being a normal, quiet, regular guy, I was quite apprehensive, and was having great difficulty getting it up. This was in spite of the fact that there were a number of very good magazines and videos to choose from. I had to hand it to sis, she knew how to pick ‘em. In fact, she had some of the most lascivious hard-core I had ever seen. It came as quite a shock to realize that my sweet, innocent sister was capable of obtaining this kind of stuff. Still, I was unable to perform.

Bear in mind, much of my failure had to do with the fact that I could hear people just outside the door going about their daily routine, phones ringing, people laughing. You begin to realize that all the receptionists, nurses, and those affiliated with the clinic know just what you are doing, or, supposed to be doing, in this room. Too many years had passed since I had been a horny kid aching to sneak off to my bedroom for a quick hand-job, oblivious to anyone's suspicions. If I had been a little more of an exhibitionist, you know, someone who would have gotten a charge out of presenting a jar of warm, pungent, cum to office personnel, I would have been able to produce the much-needed ingredient for my wife's pregnancy. Unfortunately, no dice.

After about twenty minutes or so, there was a knock at the door. Closing my robe, I went to answer it. I found sis with a most serious look on her face.

"Anything wrong?" she asked.

Well, I didn't want the whole world to know that I was unable get it up, so I asked her to step inside. Going over to the couch I sat down. Following suit, she seated herself directly across from me. "Look," I told her, setting the jar on the small table to my right. "It's just not going to work."

"Why not?" she asked. I was amazed at her genuine interest.

I explained the difficulty I was having and why. She broke the professional ice by getting this great big grin on her face and exposing a full set of pearly whites. Amy had always been a gorgeous woman, large breasts, perfect figure, and was blessed with the long dark legs that men drool over. But her greatest asset, at least as far as I was concerned, was her beautiful smile.

"Between you and me little brother," Amy began. "I never thought I would see the day that you couldn't get it up, despite the circumstances."

I didn't know what she had meant by that statement. I mean, sure, she was three years older than I was, but growing up, Amy and I had never engaged in the typical sexual experimentation that many siblings do.

"Look, Amy, I don't know what you are talking about, but the only woman who can get me up and off, is lying in another room somewhere prepped and waiting. I guess maybe we can try another day."

Amy slowly stood up and started toward the door. "Listen bro, your wife is waiting, this place is costing somebody a ton of money, and I have waited too long to become an aunt. It's going to happen. Today!"

Great, I thought, as I waited for my sister to exit the room. What the hell am I going to do now? Just then, I heard Amy lock the door – without first opening it. Then I heard her walk back to where I had been sitting.

Seating her self in front of me once more, she reached over and took my hands. "Now Bill, what is all this stuff about Crystal being the only one who could get you up and off?"

I was genuinely confused. "W...what do you mean?"

"Good gosh, do you know how many pairs of panties and bras I had to throw away because you ruined them?"

"O God..." I remember hearing myself saying. "I...I...I didn't think you knew." But she was right. About the time I had turned twelve years old, I had been masturbating regularly into Amy's underwear. When I would shoot my jizim into the crotch of her panties, I was imagining I was fucking her pussy. When I came in her bras, I was making believe I was fucking her beautiful tits.

"Jesus, Bill. How could I not have noticed? You must have been quite potent, as the entire fabric of the garment was caked and stiff with your cum. Laundering, presoaking, nothing removed those stains. I had no choice but to trash them. Your antics kept me broke. Rather than explain to mom where all my underwear were going, I spent my baby-sitting money to replace them."

"God, I'm so sorry, you should have said something back then, I would have stopped. But look, if you are trying to arouse me with this story, it's having the opposite effect. I'm so ashamed, there is no way I can perform now."

"That's just the point. That's the reason I never said anything back then. At the time...the...thought of you jerking off into my undergarments was...quite...a turn on. Particularly the fact that you found me so desirable you had to have me – in a figurative sort of way."

"Jesus, sis." I mumbled as I began to feel something stirring in my groin.

"Bill, that's not all," Amy added in a very seductive voice.

"What do you mean?"

"When you were around the age of thirteen or so, do you remember having a lot of...wet dreams?" Amy's eyes began to glaze over.

"Amy, I shouldn't be discussing this kind of thing with my own sister."

"But it was OK to fuck every stitch of underwear I owned?"

"Please, Amy. I...I was just a young, horny kid. You know how it is." Amy had always presented a prim, proper, and reserved demeanor. I could not believe the turn this conversation had taken, nor the suggestive language she was using.

"Honey, yes, I do know how it is, and I am going to ask you to forgive me for what I am about to reveal. I'll ask you again, do you remember having wet dreams around that time?"

I could feel my cock starting to bloat. Damn it, if I did end up exhibiting an erection in front of my own sister, it was no one's fault but hers. "Well, yes, I do remember having quite a number of wet dreams when I was that age. I remember waking up with a cum-caked groin a number of times. But boys that age usually do." I defended.

"You are right, they do. But I have since learned that nocturnal emissions are nature's way of releasing an over abundance of sperm along with pent-up emotions. It's your body's way of acting as a release valve on a pressure cooker. But, knowing how much you must have masturbated, your metabolism would not have needed to rely on wet dreams to provide release."

My engorged nine-inch member had begun to tent the robe considerably. And my beautiful sister could not help but notice. "So, what are you saying."

"Damn it Bill, I'm the one responsible for what you thought were wet dreams. When you were twelve, and I was fifteen, finding all that cum soaked underwear in my drawers and laundry hamper was turning me into a sex-maniac. I mean, there I was, a typical young teenage girl with a burning desire to know all about the male reproduction system, my hormones were raging, and here I find my bra's and panties drenched in fresh, hot, male sperm. I was going nuts. I bet I was masturbating twice as much as you were. At times I was so depraved, I would lock myself in my room with the freshly soiled garments, strip naked, and rub your sperm right into my pussy while jilling-off. Why, I would even lather it into my breasts to help make them grow bigger. Look here," Amy continued, unbuttoning her blouse and exposing her naked tits to my gaze. "I think those daily treatments worked quite well, don't you?"

Absorbed as I was in her very erotic story, not to mention my fixation on her fantastic tits, I failed to notice my engorged cock was protruding from my robe. All I could muster was a feeble, "Yeah."

"Bill, forgive me, I just had to see that wonderful stuff shoot out, had to see what it looked like when a man ejaculated his semen. So at night, I would sneak into your room and...Bill, I would masturbate you until you shot your load all over yourself and your bed. Thank goodness you were such a sound sleeper."

Now I was aware of my erection, and aware that my pre-cum was leaking profusely from the slit in the end. At that point, I no longer cared, sister, or not. She was right, however, I have always been, and still am a very heavy sleeper. The world could literally come to an end around me and I would not wake up. In fact Crystal constantly complains about this particular flaw of mine.

"Then, about a year later when I was allowed to date, I still continued to visit your room, except this time...look, those jerks I was dating then, either didn't last long enough to get me off, or worse, they just fumbled around, going no further than petting. For the most part, all they ended up doing was getting me so hot that I just had to have some type of male induced release. So I would come up to your room. Now Bill, promise you won't hate me for this, but I would either orally or manually get you hard. Ensuring that you were in one of your deep slumbers, I would very gently straddle your hips. Slowly, I would very carefully lower myself onto your erection, until you were buried balls deep. Then, very gently I began to fuck myself with your cock. The sessions would last for hours at times, as I had to be careful not to wake you. It was usually my orgasm and the ensuing vaginal contractions that would eventually trigger your release.

"This went on for several months before I had to quit. You see, while the boys I dated used condoms, obviously I had to take my chances with you. Having jacked you off so many times in the past, I new just how long it would be before you blew your wad, knew all the indications of your impending climax. I was usually able to enjoy several orgasms, before climbing off you, just before you came in me. And, Bill, just so you know that I never left you in need, after I satisfied myself, I would always finish you off orally or manually before I went to bed.

"Then one night it happened. Looking back on it, I now know it was inevitable. I'm not sure if I got lost in my climax and didn't pay attention to the signs of your approaching orgasm, or I just didn't care. Maybe you came too quickly, I don't know, but you ended up shooting one of your most copious loads right up my pussy at the same moment of my release. After that I was afraid of getting pregnant with your seed, so I made sure I never used you again for sex."

By now I was wanking away for all I was worth. It looked like momma was going to get a full vial of my baby juice. I reached for the glass container.

Except, Amy stopped me. For the first time, I noticed that the woman seated across from me had gotten hotter than hell as she related the tale. Sister, or no, she was as wanton a woman as I had ever seen. Her nipples were swollen and erect, She was rubbing her thighs together as she watched me masturbating myself. "No Bill, God forgive me, after all these years, I just have to have you again." With that, my beautiful sister stood and removed the rest of her clothes. Stepping out of her skirt, she wasted no time in coming over to the couch that I was sitting on. My very own beautiful sister Amy laid back against the left arm of the couch and spread her legs. In a deep husky voice she said, "Bill, please, I need you now, please fuck me. If it helps, you can pretend I am some one else. Pretend that I am your wife if you want. I will be any one you want me to be, as long as you fuck me. Now!"

It was a race to sink my nine inches in to her drooling cunt before I blew sperm all over the place. As I shoved it home, I was beyond caring that this beautiful woman was my own sister, my own flesh and blood. "O God...sis...I want...I want you to be...ah...ah...ah...I...un...uh...ah...I want to fuck...fuck to...know...oh...un...fuck...what...it's...like to...fuck...my...sister...Amy."

"Oh Billy. Oh...yes...yes...oh yes. Oh that's a good brother, aug...aug... fuck sis just like you always wanted. Oh...oh...oh...oh...Billy, Billy, this isn't my underwear you are fucking now, oh...oh...aug...oh...this is the real thing...oh fuck your big sister...oh...oh...oh...cum in your big sister, just like you did so many years ago, ooooh iiieeee, oh, oh, oh, do it, do it nowwww. Oh Billy I'm cccuuuuuuummmmmmmmmiiiiiiiiinnnnnngggggg. Do it nowwwwwwww."

"Oh sis, I finally get to cum in your pussy...oh...ah...after oh...years...of aug...screwing...fuck...fuck...your pan...ugh...panties. Oh my god...your tits... sis...got ...aug...got to f...fuck...your...uh...uh tits. Oh, sissy, aug... I'm cumming in youuuuu. Uh...uh...uh...uh...uh...uh...uh...uh...uh...uh..."

I thought I would never stop filling my sister's vagina with my spunk. But like all good things, it came to an end.

"Look at us," I said, pulling my still erect prick out of Amy's sopping cunt. "What are we going to do about Crystal now? Any way to somehow collect this stuff?"

As my sister got up off the couch, I watched four spoon-fulls of my cream leak from the red bloated lips of her vagina. Immediately I grabbed the cup in an effort to catch it. "What's the matter, brother dear, afraid there isn't any more where that came from? You seem to forget that I know better."

I looked up at her in confusion.

"When you were blowing your sperm deep into my womb, you did say you wanted to fuck my tits, didn't you?"

I just looked up at her and swallowed, then looked down to my rapidly swelling erection.

Sis knelt down before me and reached down to catch the sticky slime running out of her pussy. "Just like old times again, huh?" Amy said as she bathed and lathered her tits with the warm fluid. Wrapping her well-lubricated 38-D breasts around my dick, she began to masturbate me with her tits.

No need to worry, I was shooting off like a fire hose in less than a minute. Still able to read my impending ejaculation after all those years, my sister grabbed the vial and expertly wanked me off, practically filling the medical device to the brim. As I finally slowed to a dribble, Amy pursed her velvety lips over my shrinking member and sucked the remainder of my sperm from me.

Long story short, that very event impregnated my wife. Currently we are the happy parents of a healthy eighteen month-old baby boy. My sister, who is the happy aunt of such, has never brought up the subject of our perverted laision. In fact, in our dealings, there has never been a hint, not even in her eyes, that anything had ever happened between us. But now, my wife wants to try for a girl.

I just can't wait.