'This is quite fascinating.' Dr. Biernier spoke analytically finding his words slowly with each syllable having purpose. 'Congenital defects such as these are rare. I've seen such cases. I have studied those cases. I have never witnessed it in person, much to my dismay.' He paused and stood upright looking down at the intersex child lying with their legs spread wide on the bed. 'What's most surprising is the singular definition of both organs.' He pick his camera up off the table, 'do you mind, ma'am?'

'Oh dear, no, Evan doesn't mind either. We taught it to be proud of what it is.' Mrs. Troile looked over her child's naked body. A large halogen light sat above the bed and shown over its exposed genitalia.

Evan looked over and nodded in agreement not knowing any differently.

Dr. Biernier put his hand on Evan's flaccid 3 inch penis lifting it so it hung against its abdomen. 'So, Evan's penile development matches that of any 9 year old boy except there are no testes.' He looked to Mrs. Troile.

'Correct Dr. Biernier. It has a penis where the clitoris would have developed and Evan's tentacles developed as a fully functioning vagina.'

'Yes, I see. Fully functioning you say?'

'Yes, doctor, that's correct.'

'May I examine the vagina?'

'Please.'

Dr. Biernier moved to talk to Evan. 'I need to examine your vagina so I'll have -'

Mrs. Troile interrupted. 'It's quite all right, doctor, It doesn't have any objections.'

He nodded pulling his seat up and sat down leaning in to adjusting the light to the child's vagina. He didn't wear gloves, Mrs. Troile had objected to treating Evan like some lab experiment. She said it should have confidence in its body and invite people to explore their curiosities. He put his hand on the soft pudgy lips of the labia spreading them wide to reveal the vaginal opening.

'There was no Hymen?' He asked.

'As I said it is a fully developed vagina. The hymen was broken some time ago.'

'Fascinating.' The doctor quickly noticed the scaring around the vaginal opening and inside walls indicating a significant amount of penetration. Many people are unaware of the traces left from vaginal and anal penetration. Dr. Biernier has seen many of these cases during routine examinations of children. If the father is in the room and you linger as though you have made some troubling discovery you can make them sweat he'd hoped more than once they would blurt out a confession and he could pretend to be shocked. 'Hmmm.'

'What is Doctor?' Mrs. Troile inquired wanting to be of assistance to the man who was highly regarded in many social circles. He considered most conditions to be meaningless but he was here in her house and was deeply interested in her child after she had written to him about Evan's condition. All of Evan's medical records were immediately mailed to the Doctor and he was on the first flight out of Baltimore. If the examination went well he might publish a paper and he would pay her a healthy sum for the privilege and possibly future examinations.

'I'm curious. I noticed after shifting Evan's penis with my hand it became stimulated. Now in most cases we find the penis to be undeveloped and often unable to become erect. I see blood flow into the genital is quite strong and it became slightly erect.' Dr. Biernier spoke while staring at the pale, smooth, hairless shaft of the child's penis. 'It's about 5 inches now.' He sat back in the chair. 'Is the penis very sensitive?'

'Yes. Very sensitive as I suspect many boys at this age would be.' Mrs. Toile replied.

'Evan, when I touched you penis did it feel good?'

Evan looked to its mother who nodded. Evan's head indicated a very clear yes.

'Does it ejaculate?' The doctor asked.

'No, sadly it has only dry orgasms but its vagina does secrete fluid, quite a bit of it too.' She paused a moment. 'About as much as Evan's younger sister and me.'

'So there is a family dynamic at play. I suspected as much. Evan displayed no hesitation to my touching and the evidence inside of the vagina is overwhelming.' Dr. Biernier looked to Evan's mother. 'You have a husband, yes? He penetrates Evan?'

'Yes or we use dildos, fingers, oral and so forth.'

'Does he ejaculate inside the vagina? Does Evan have ovaries?'

'As I said it's fully formed and functional.'

'Tell me Mrs. Troile.' Standing he walked around to the beautiful women. 'When exactly did you being molesting your children.'

Mrs. Troile looked confused and angry. 'Molest my children!? I would never do such a thing.'

Dr. Biernier stopped and ran over through his thoughts. 'You just admitted your husband performs intercourse with Evan, you use dildos on it and I assume partake in over sexual activity.'

Mrs. Troile still had the same expression on her face. 'Yes that's correct. We teach Evan to be proud of what it is. We try to show it that its body is beautiful and capable of many great things.' She laughed derisively. 'Would you have me shame my child for its body? And how dare you accuse me of being pedophiles. I have a beautiful 7 year old girl and a 13 year old boy and I would never touch them like that.'

'They can have sex with Evan though?'

'I'm beginning to think inviting you was a mistake. You have a perverted mind!'

Dr. Briener attempted to be rational. 'Please Mrs. Troile I'm only trying to understand your families situation. Not only am I a medical doctor but I have studied many years of psychology and cases like these are, as you know, complicated.' He began rubbing the woman's shoulder's soothingly. 'So tell me how the family dynamic ties into Evan's condition.'

Mrs. Troile took a deep breath. 'When Evan was born you can imagine we were all curious. My husband and I struggled to understand its condition. The doctor's weren't much help so we began asking questions for ourselves.'

'What questions did you have Mrs. Troile.' He was close behind the women now. She was much shorter then himself, around 5'6. She was perhaps 120 pounds and her shoulders were quite toned meaning she took care of her body. Tan skin and long brown hair in a pony tail.

'At first I wanted to know if Evan was more a boy or a girl. Could he become erect and make love to a woman or could her pussy take a man's erect penis. Around the time Evan was four my husband and I decided to find out. Let's not forget that my oldest son was 8 at the time and learning about sex-ed and you can imagine how confused he was. So after one of Evan's baths we went into our bedroom and I fondled his penis to erection. I remembered how big Geoffrey's, my eldest son, penis was at that age and everything was normal. Then, we lubed my husband's pinky with KY but it was just too big so we used Geoffrey's finger and it slide into Evan's vagina with little resistance.'

'Fascinating. Tell me when the other activities started.' He was running his hands over her shoulders and down her arms and back to her shoulders. Mrs. Troile paid him little attention or the fact that Evan still lay naked and spread out on the bed.

'I'm not sure but after that first time we continued experimenting. Geoffrey was always sort of negligent of his younger brother because he was different, called him names but after he fingered Evan he was so much more loving. Evan didn't mind too much. Somewhere along the way we decided that Geoffrey, Evan and even the whole family could really bond and educate each other by using Evan's condition in a positive way.'

'Your youngest, Abby, how does she fit in to all of this?'

'I suppose this will sound silly but we weren't sure if we were putting it in Evan's mind that only men provided sexual companionship as Geoffrey was penetrating Evan's vagina and asshole almost daily. The penis at the age of 5 was only around 3 inches hard which was too little for my use but Abby was perfect. She always took right to Evan and when we lay them together, naked, she started sucking its penis right away, like her binky. That was actually Evan's first dry orgasm. Its penis jumped around but the vagina was secreting fluid. Evan was still hard, as boys that age always are, so we lay Abby on her back and spread her legs and put Evan on top positioning the little cock at her pussy entrance and showed him how to fuck. Abby was a bit distraught at first but she came around after a few weeks. It was so cute, one time Geoffrey was penetrating Evan's asshole and Abby was on top fucking his penis while I fingered Evan's pussy and my Husband was teaching it about performing oral.'

'What did you learn from the experience?' Dr. Biernier had a large erection in his pants under his lab coat and his hips were inches form grinding into Mrs. Troile.

'It was clear Evan enjoyed the sensations, the double penetration and orgies. Kids today are into all sorts of wild acts, they really should be prepared for anything and the schools do a terrible job. Evan, of course is happy to help educate others on its condition, but It can do as much as anyone else. More in fact!'

Dr. Biernier pressed himself into the women and began to kiss her neck. 'Sexual dynamics in our species is such a complex subject and right now -'

Mrs. Troile pushed away from the doctor stammering backwards while staring at the man's erection. 'I'm sorry. I'm a bit nervous. I had expected that this might happen. You understand my hesitation. I've never let anything like this happen. Go again and take you pants off.'

Dr. Biernier undid his belt and slide off his pants and underwear, his 7 inch erection bobbing in the air. 'Should we go into the other room?'

'I think the bed is big enough for your and Evan just fine, if you don't mind.'

'Me and Evan?'

'Of course. You had many questions about the functionality of its vagina for your experiment; you should want to explore it firsthand.' She turned bright red and turned from the doctor. 'Listen to me! How presumptuous of me to assume physical penetration is necessary for your study.' She turned back. 'You probably have machines that can look inside.'

The doctor just stood in his place dumbfounded but weighing his options. No one person had ever invited him to perform intercourse as the experiment. He would never be able to submit it as research but why should the opportunity be refused if it was being offered. He was no child lover but what's one vagina to another. Evan was youthful, its pussy was probably tight and soft. Mrs. Troile wasn't registering his sexual advances so why leave today without release, it was unhealthy.

'There are a few precedents in the medical field that would tolerate such a thing for the sake of hypothesis as long as we understand this kind of study will likely not be in my report and per our confidentiality agreement, remain unspoken.'

Mrs. Troile beamed up at him. 'Yes, of course! There is KY in the drawer.'

'Do you have a condom?'

'We keep Evan on birth control.'

Mrs. Troile came back with KY in hand and applied it liberally over the doctors throbbing cock which danced around at her touch and oozed precum. Then she moved to Evan and spread some across Its pussy, rubbing in circles around Its labia and using two fingers to penetrate the pussy spreading the lubricant inside.

Evan's legs spread at its mothers touch inviting more contact to the sensitivity of its vagina. Evan's penis was fully erect at a little over 5 inches. It was little bigger than the diameter of a quarter, totally hairless, smooth with no signs of veins and it was uncircumcised

'Evan is open enough. It might be tight at first but my son and husband say it'll open enough that you won't hurt it. Evan has never had another penis inside of it except for my husband so it'll be nice for it to experiment. Evan you tell him what he makes you feel so he can record it and study it.'

Dr. Biernier thought if this was going to happen he shouldn't hesitate. He moved in-between Evan's spread legs pointed his penis at the soft, plump, hairless labia. The tip of his penis touch the warmth of Evan's lips sending a wave of pleasure through his cock causing his body to shutter as he let out a moan. He continued to press forward until he met a resistance and stopped to look at Evan. It's just lay there looking into his eyes. He had big beautiful brown eyes that looked either lost or empty. He had lightly tan skin, not much of any muscles, a little baby fat but relatively normal for any child of 9.

'I'm going to push inside of you Evan. Are you ready?' The doctor asked.

Evan again looked to its mothers whom nodded and then Evan looked back to the doctor and nodded. Evan's healthy young penis was standing rigid straight up in the air, its foreskin pulled down around the head of its penis revealing the bright red head.

Starring at Evan's little boy cock and feeing the warmth at the tip of his cock sent an overwhelming urge through his brain. He was no longer a doctor conducting an experiment but an ape relying on its baser instincts to mate and reproduce.

Dr. Biernier groaned and thrust his hips forward into the intersex child. Evan's tight vaginal opening was forced opened and wrapped tightly around the thick penetrating shaft and bulbous head of the doctor's cock. He had managed about 4 inches with the first thrust and slowly withdrew completely from the child's pussy.

Evan's face relaxed and it sighed when the cock left its tight pussy. 'Put more inside.' Evan whispered to the Doctor.

'It feels good when I fuck your pussy? You want my big cock in your pussy?'

'It's bigger then my father's, right mommy?' Evan asked.

'Daddy's penis satisfies well enough, Evan. We should appreciate what we have and not judge others.'

'I'm sorry mommy.'

'It's okay Evan. Now jack your penis for the doctor so he can see you orgasm and feel it around his penis when your pussy contracts.'

'Yes mommy.' Evan took his thumb and 2 fingers and began stroking up and down the little cock.

Dr. Biernier watched the little boy pleasure himself a few moments then pushed through into the child's vagina. Once he reached 4 inches he stopped and grabbed hold of Evan's legs just under his ass cheeks and used them to pull the boy into his cock while thrusting his hips back and forth working his cock fully inside 1 inch at a time until all 7 inches were inside of its immature 9 year old pussy.

Evan grunted the entire time, pain washed over his face, tears running over his cheeks but his hand was a blur on his little cock. The child was being properly pleasured.

The doctor pulled out completely and pushed back in. This time the child took his cock much more easily. Their fucking was now smooth and in rhythm. Evan's hips bounced up and down as the doctor pulled out and pushed back in.

Evan's moans and breathing became louder and his hand moved faster over the 5 inch cock and its pussy contracted violently around the invading fat cock ripping into its pussy. Evan's hand slowed to a crawl, lightly moving up and down the little penis as it had it experienced its first dry orgasm with a stranger.

The doctor was unable to move in or out of the child its pussy was clenched so tight. 'Aha fuck that's good Evan. I can feel the vaginal muscles.' Dr. Biernier was concentrating all of his efforts not to ejaculate yet. 'Very strong.'

Mrs. Troile smiled. 'I told you fully functional.'

There was a noise behind the doctor which sent sudden shock through his body and softened his cock a little.

'What's going on Mom?' Mrs. Toile's eldest son, Geoffrey, was standing in the doors.

Next to him was her daughter, Abby. 'Who's the man putting his penis inside of Evan's vagina?' Mrs. Troile chimed in, 'Dr. Biernier these are my children. Kids, you remember me telling you about the doctor. He's here for a study. Evan was so gracious as to educate him on its bodily functions.'

The doctor stood frozen standing in front of Evan, his cock several inches inside of the boy unsure if he should stop. 'Hello kids. You mother has explained to me the situation and I do find it fascinating.'

'That gives me an idea. I told you about how we allow out family to bond and understand sexuality through education, perhaps we could have Geoffrey and Abby join Evan. You could see how Evan can stimulate 3 individuals, like I told you.'

The doctor was silent but mustered out an acceptance. 'Yes I suppose that would be acceptable. Of course the agreement we made extents to the whole family and anyone involved in the study. We don't speak of this to anyone.'

'Kids, Dr. Biernier is a highly regarded doctor and you are to do as he says and assist him in any way possible. Now strip off your clothes and help the doctor understand Evan's condition and what was it you said?'

'Complicated family dynamics.'

'Yes ours is one of complexities. Geoffrey, let the doctor have its vagina so get underneath Evan and use his ass, and Abby you'll use Evan's penis but face the doctor so he can study your facial expression.' Mrs. Troile cleared her throats, 'I'm sorry I'm making presumptions again. Is Abby's face important to study or should her back be to you?'

The doctor was stunned but managed to blubber out a meager, 'Yes, ma'ma, uh that is probably acceptable.' He watched as Geoffrey took his shirt off revealing his muscular pubescent body; well defined chest, slightly chiseled stomach and a deep tan. Then, without any sense of self-conscious thought he stripped off his pants and underwear revealing his erect, uncut, veined cock. He had a little ruffle of curled hair around the base of his shaft and low hanging ball sack. He was a solid 5 inches in length like Evan except his was thicker. Abby starred into the doctors eyes while giggling at the thought of being allowed to be naked in front of a stranger. Abby wore a sundress which slipped over her head with ease. She was a thin little thing, long slender neck, boney shoulders and small arms. Her chest was undeveloped except for two puffy pink nipples. She had a little baby fat on her stomach but it was still very flat and somewhat toned. Her underwear came off without hesitation. Her pussy lips were small and not clearly visible while she was standing in front of the doctor.

Geoffrey had made his way around to Evan but Abby was content to stand fully exposed so the doctor could drink in her nudity.

Evan's pussy had relaxed allowing Dr. Biernier to slide his cock out of the child. Abby's stripping sent his cock to full mast ready to double penetrate Evan. Geoffrey was strong, he lifted Evan up without issue and slid under him positioning his cock between the boys ass cheeks.

Mrs. Troile trotted over with the same bottle of KY and slathered Geoffrey's cock then she put another dollop on her fingers and jabbed 3 fingers inside of Evan's asshole. Evan let out a howl at the sudden intrusion and was followed by its fingers jacking the little cock to full erection while having his ass pleasured by his own mothers.

'Let Mommy help you inside.' Mrs. Troile took hold of her sons cock, gripping it with all of her fingers and aiming it into Evan's asshole. 'Okay baby thrust as hard as you can and get it in there.'

Geoffrey thrust his hips upwards into Evans ass getting the entirety of his cock inside in one motion. After he was inside he continued to fuck his sibling then reached around and began jacking Evan's cock for him. Evan let his arms fall to the side; he closed his eyes and just savored the sensation of his brother's cock in his ass.

Abby hopped up onto the bed and climbed over top of Evan's hips. Geoffrey held Evan's cock upwards and Abby guided her pussy until the tip was touching between the folds of her labia then let herself slid the onto its penis taking all 5 inches inside of her prepubescent body.

Abby was still starring at the doctor. 'It's your turn! Stick it inside so we can have fun together!'

The doctor was eager to cum, his balls ached and the child's vagina was welcoming and very pleasurable. He positioned himself in front of Evan and pressed his cock inside, much easier the second time. Abby was inches away from him and she only stared and smiled as she watch his face contort in ecstasy. Geoffrey was obscured underneath Evan but his eagerness to fuck his sibling was doubly noted. Abby seemed unaware about the entire situation, same as Evan, their mother was certainly delusional but unless he met the father a full diagnoses couldn't be made.

Geoffrey started off by thrusting into Evan pushing his body away from the doctor ripped Evan's legs and pulled the child back into his penetrating cock. Abby was content to just bounce up and down on her sibling regardless of what the two males were doing. The group of 4 engaged in their sexual waltz found their rhythm quickly. Geoffrey, using his strong legs as leverage thrust upwards into Evan pulled the child from my cock, then grabbing the child the doctor returned it to the original spot while Abby continued to stare at the doctor while Evan gripped Abby's hips and helped her move up and down on the length of the thin, smooth, hairless cock that glistened from the girls moist 7-year-old pussy.

The doctor was quickly losing control of his cock when Abby began moaning. Her eyes were slits as she watched the man and her breathing became labored. Her body had become limp while Evan helped fuck her on his cock.

Geoffrey's thrusting lost none of its vigor; he had actually picked up his pace. His grunts had become louder.

The doctor had to match the boy's pace to keep in step with him. Evan's pussy was beginning to convulse again. The 4 bodies had become a blur of humping and grinding, the acrid odor of fuck juices filled the air, their sweaty bodies grinding in slapping into each other without concern that a 9-year-old child with 2 different sexual organs was being used to pleasure its 7-year-old sister, 13-year-old brother and a highly regarded medical doctor. The mother stood at the side of the bed and watched emotionless. A wry smile crept across her face while she watched the orgy.

Evan moaned out, 'cumming.' It was the first thing the doctor had witnessed it say without first consulting it parents.

'Go ahead Evan. Show the doctor how much you love teaching others. Show him what your body does. Show the doctor how you have big orgasms.' Mrs. Troile said.

Evan's pussy tightened in a vise lock around the doctor's cock. He could feel Geoffrey's cock inside of Evan's ass through the thin tissue which separated its ass from vagina moving in and out. Then Abby fell backwards onto her sibling with Evan's cock still deep inside of her shaking from her own little girl orgasm. Then Geoffrey let out a low moan and the doctor could feel the boys cock pulsing inside of Evan's ass as it shot ropes of pubescent cum inside of the family fuck toy. The doctor thrust himself as deep as possible into Evan's tight pussy then his balls let lose everything they had. The doctors cock pulsed rapidly and the flow of cum shot up through his shaft and deep into the uterus of the 9-year-old.

Everyone lay there in a pile, sweaty bodies breathing heavily trying to regain their composure. Eventually Abby rolled off and laid herself across the bed. The doctor let his cock fall out with a gentle plop and long strands of cum followed. Geoffrey rolled Evan over on its front while he was still inside of the child and slowly withdrew his rigid cock; no surprise a boy of 13 would be ready to go again so soon. He was lucky he never had to use his right hand to get off; there was always a tight, warm, inviting hole he could cum into.

Much to the doctors dismay the father never returned home. Mrs. Troile did invite the doctor back at anytime. The doctor suggested that perhaps he could fly the whole family out to Baltimore for a week of interfamily study which she said their family would discuss.