Penis Enlargement Surgery (Franken Fran)

A/N: Penis Enlargement Surgery was a commissioned one shot originally written back in August of 2021. Posting it up here and now for people to enjoy!

Themes: Big Dick, Rough Sex, Breeding

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Fran Madaraki was an artificial human being created by Dr. Naomitsu Madaraki, the world's most famous surgeon. Perhaps that was why she was so interested in science and human biology. Her experiments, and the numerous procedures she performed on the people desperate enough to come to HER of all people for help, were infamous for being somewhat Faustian in nature.

Not that Fran ever minded the things she did, or the results of what she made. After all, it was all in the name of SCIENCE! Even if there were consequences for her actions, even if things didn't always turn out exactly as Fran intended, it mattered little. It was all a learning experience at the end of the day.

But of course, to that end, Fran was more likely to take on new challenges then old ones. And certainly, a young man coming to her desperate and hopeful that she might be able to give him a penis enlargement was… new and unique for sure. Fran hadn't been entirely sure it would be interesting at first, but then she'd begun to have IDEAS and before she could second guess herself (not that she ever really did truth be told) she had agreed to perform a procedure on him.

And so, the patient had gone under, and Fran had operated on him. While the procedure in and of itself might not have seemed all that interesting, Fran was an expert at making things interesting. She'd done so this time by thinking outside the box. Penis enlargement was such a drab, silly male fantasy. Every guy in the world would like an extra inch or two added to their cock in some way!

But that was boring. On the other hand, transplanting an entire horse cock and balls to the patient and then modifying his circulatory system in order to support the utterly massive phallus was much more interesting. Indeed, by the time Fran was done she'd effectively given the young man a third leg of sorts, and the artificial girl couldn't help but be a little proud… while also more than intrigued.

She would have to run some tests, but first and foremost she needed the patient awake to be able to test him most efficiently! Luckily, once all the blood from the procedure was cleaned away, smelling salts did the trick like always and the patient was soon coming back to full awareness.

"Ohhh, my head… where am I? Wait, no, I remember…"

Smiling, Fran nods as she takes notes.

"Excellent, the patient's memory has not degraded appreciably in any fashion. How are you feeling? Any pain?"

"Uh… no? Did the procedure work, Doctor? Did you… do it?"

Fran just smiles a little wider, noting down silently how embarrassed the patient was by the whole situation. He probably would have preferred her to be a man to make this less awkward, but really, Fran was already a created human being. It couldn't get less awkward then that, right?!

Still, she doesn't answer him, instead letting the patient find out for himself. Which he does in short order, because of course the first thing you'll do after asking if it worked was check with your own two eyes. The yelp that the patient lets out at the size of his newly transplanted horse cock and sizable hanging ball sack makes Fran raise an eyebrow in mild surprise. Did he not like it?

"H-Holy shit! It's huge!"

"Well, yes. That is what you contracted me for, is it not?"

"It's so fucking massive! And it's… why is it like that at the end? Wait! This is a horse dick!"

Nodding amicably, Fran shrugs as he shoots her an accusatory glare.

"Indeed, it is. You wanted an enlarged phallus. I have given you a phallus that is approximately three times as big as your previous genitalia. I do hope you are pleased, but even if you are not, please bear with me while we finish this post-op checkup. Next is to make sure the modifications I made to your circulatory system are fully operational, so that getting an erection with your new penis doesn't make you keel over dead from a heart attack!"

With that cheery possibility mentioned, Fran reaches up and unbuttons her shirt, stopping whatever he might have said in response in its tracks. He certainly has his mouth open when she looks up from what she's doing, now flashing him with her bared set of plentiful tits. He probably had something to say, but whatever it was is thoroughly derailed as he just stares, mouth agape. And there, as Fran was hoping. Down betwixt his thighs… his new cock begins to stir.

-x-X-x-

Michael, for that was the young man's name, could only stare, wide-eyed, at the young woman who'd just exposed herself to him. The doctor's tits were the first tits he'd ever seen, truth be told. And while Fran herself was… well, stitched up under her shirt, it didn't detract from the beauty of his first pair of breasts, not one bit. Indeed, he'd long since come to terms with the blonde's weirdness.

When he'd initially asked about her… oddities, she'd been incredibly blasé with him. Namely, she'd called herself an artificial human, explaining that she was not born but constructed from parts. While that explained the massive bolts fitted upon her temples and the faint stitching marring her otherwise beautiful body, it still left more questions than answers for Michael.

But at the end of the day, he hadn't come all the way here to ask questions about her, he'd come here to get his dick enlarged. That might not seem like it should have been all that important a procedure, but you had to understand the world Michael had grown up in. He was maybe a little bit on the small size, before going under the knife for Fran.

But in a post-modern digital era where everyone lived their lives on the internet and said world-wide web was in turn filled with porn that gave both men AND women unreasonable expectations of what their body parts should look like? Michael had become obsessed with dick size namely because he'd been conditioned to believe he was particularly tiny.

He hadn't been, not truly, and in another time and place, in another era, he would have likely found a nice enough girl to settle down with and have kids with in a nice suburban home with a white picket fence.

But in this time and place, in this era, he was sitting up on the operating table with a massive horse cock and balls between his leg. A massive horse cock that was currently growing erect as he stared, gobsmacked, at Fran's exposed bosom. An erection that the blonde artificial woman had just explained might literally kill him if she hadn't MODIFIED HIS CIRCULATORY SYSTEM RIGHT!

Needless to say, Michael is torn between hyperventilating and sheer arousal for a moment, but as the seconds pass by and his horse cock points in the blonde mad scientist's direction, growing more erect by the moment… he doesn't feel any worse for wear. Not even light-headed. He does feel more and more aroused though…

"Hm, patient seems to be handling the erection of his new phallus quite well. Experimental Modifications to circulatory system deemed a tentative success."

If only she didn't have to say things like that. Paling, Michael chokes on his own spit.

"E-Experimental? Tentative?!"

Glancing at him, Fran just smiles. It's clearly a false smile, one probably intended to put him at ease. It fails, as it has every time, she's tried it so far.

"But of course. I've never transplanted a horse's genitals onto a human male before. Every part of this procedure was experimental! And we can't count our chickens before they've hatched. There's still every chance you'll keel over. But don't worry, we're going to put you through your paces in the name of SCIENCE!"

And with that, Fran proceeds to the next test with her tits still hanging out. Namely, she steps forward and proceeds to grab his horse cock with both hands, stroking it up and down while double-fisting it. Michael groans as she does so, his new member twitching and growing even harder under her very direct ministrations.

Meanwhile, Fran is still fairly focused on what she's doing… no, she's more than focused, given how she's drawing closer and closer to the flared head of his cock, her nostrils flaring as she breathes in the strong, musky smell coming off of his horse penis.

"Hmmm, what an intriguing smell. I'll have to get closer… for observational purposes of course."

Call it what you will. Spite for all she's done to him so far, perhaps? Or maybe he's just caught off guard by it as much as she is. Maybe it's all just happening too fast for him to warn her. Either way, Michael's first climax with a horse cock between his legs comes out of nowhere, or so it seems. In truth, Fran actually sees it coming from a mile away. She knows its going to happen and she lets it happen, purposefully tilting her head back and sticking her tongue out in anticipation. And then he ejaculates all over her.

The load of seed that explodes out of his horse dick, produced by his horse ball sack, is utterly massive and coats Fran's entire front, from the top of her head to her navel, covering all of her exposed skin in white, hot jizz.

The thick, viscous, and altogether strong-smelling seed that he ends up disgorging onto her causes Fran to go still for a moment. The enhanced musk scent fills her nostrils and indeed the entire room at this point, and the young mad scientist finds herself flushed and panting with need. She knows, obviously, that she's being affected by an outside influence in the form of that smell sending all sorts of signals to her brain meats… but she's too thirsty at this point not to go along with it. Besides, it's for SCIENCE!

"Very good! We will now move on to the next test!"

Michael can only watch, somewhat amazed but also horrendously aroused, as the cum-coated surgeon turns away from him and bends over another observation bed, reaching back and hooking her thumbs into the waistband of her pants, pulling them down her legs to reveal she's not wearing any underwear underneath.

While the faint stitch marks continue all over her body, her pale form is still more than pleasing to the eye. Certainly, pleasing enough to Michael's eye that he hops off of the bed he was sat on and walks over to her almost like a zombie, his hands wrapped around his new horse phallus as it grows hard all over again at the sight of Fran's plump posterior and pale thighs framing a glistening wet set of pussy lips nestled betwixt them.

Indeed, it only gets harder to hold himself back when Fran even goes so far as to wiggle her hips back and forth, causing her ass and thigh flesh to jiggle ever so slightly.

"Go on then. Stick it in!"

Perhaps not the most scientific way of saying it, but then Fran was very much affected by his musk at this point, so some allowances can be made. With a growl, Michael all but lunges forward and finally mounts and fucks the woman in front of him. Plowing into her from behind, his horse cock enveloped by her pussy lips and then by her entire incredibly tight tunnel as he refuses to go slow or allow her to adjust, Michael throws his head back and lets loose a wanton groan as he digs his fingers into Fran's hips and just… goes at it.

For her part, Fran is soon squealing and screaming in pleasure. As it so happens, this is the artificial human's first time having sex. It's just never been relevant before now. There's always been SCIENCE to be doing. Except… wasn't copulation in and of itself a form of science? Mixing together bodily fluids, potentially creating something new and exciting…

Ah, who was Fran kidding? Certainly not herself! In truth, it just felt really, really good! It's not long before her eyes are rolled back in her head and her tongue is lolling out of her mouth. The artificial blonde's hands end up clawing into the observation bed in front of her as she stains it irrevocably with the thick musky horse seed covering her front. She goes up on her tip toes, instinctively raising her hips into the air as Michael pounds her silly and then some.

Finally, she's seeded. Finally, he begins to cum, causing Fran to experience a truly explosive orgasm as his cum fills her womb to the brim.

It's at this point, in the throes of ecstasy on both their parts, that the door gets broken down and a certain other artificial human enters the room with anger and worry on her face.

"F-Fran!"

Blinking as Veronica, clearly thinking Fran was in danger, takes in the scene of her sister getting plowed as well as taking in a noseful of Michael's heavy musk, the mad scientist lets out a perverted, drunken sort of giggle.

"V-Veronica! Perfect, you're just on t-time!"

"F-Fran?!"

Showing off some of her inhuman strength, Fran hip checks Michael out of her, bumping back into him and sending the well hung young man stumbling a couple steps as she rights herself and gives Veronica a bright smile.

"I need to be able to observe the patient in action from an outside perspective! Go ahead and strip down so that he can fornicate with you next!"

"W-What?!"

And yet, Veronica does as she's told, a combination of love for her big sister and the heady musk filling the room causing the dark-haired artificial human to strip down to nothing. Ending up on her back on one of the observation beds, she can only stare up at Michael as he climbs aboard, his cock still rock hard and straining for more sexy action.

Fran just smiles and nods when Michael looks to her for confirmation, and a moment later his massive horse cock is pressing into Veronica, slowly sinking into her. Definitely slower than he fucked Fran, at least at first. Once he gets a pace going though, he definitely starts to pick it up, increasing his speed as Veronica's eyes go wide and her mouth drops open, letting out a wanton moan.

At first, the dark-haired young woman simply claws at the bed beneath her, but as time goes on, her limbs begin to instinctively incircle Michael's body as he takes the artificial girl in a consummate mating press. Her legs end up in the air, half-wrapped around his waist, and her arms go around his neck as she pulls him down into an instinctive kiss.

Fran, meanwhile, takes all of this in, 'observing' things from naught but a foot away. However, she's not taking notes save for mentally, and rather than writing her observations down as she normally would be doing, the mad scientist is instead sticking her fingers in her own creampied cunt, stirring them around, and then pulling the horse cum laden digits out of her quim to bring to her mouth so she can taste test Michael's seed.

She definitely doesn't remember making it taste so good on purpose, so Fran chalks that up to a happy accident, even as Veronica slowly but surely loses control of herself just as Fran did. The blonde can only grin, happy for her sister, as Veronica's wide eyes begin to roll back in her head, her moans turning into squeals and screams on the same level of volume as Fran's own ecstatic and blissful cries.

Michael, for his part, just grunts and keeps on fucking Veronica, too turned on by this whole situation NOT to plow the second artificial human he's met silly. Fucking Fran had been so fun after all, how could he do anything BUT give his all to doing the same to Veronica? Even if he didn't know who the second stitched up girl really was, it seemed like she and his surgeon were close… so why not share this pleasure with her?

Indeed, eventually things end between him and Veronica just as they did between him and Fran. With a hefty creampie as he fills and fills Veronica with his new horse cock's seed. Pumping a nice thick load into her womb, Michael lets out a loud groan before pulling out and resting back on his knees, panting.

Still, it seems the operation has been a total success. He's a little winded and a little tired, but he's not feeling faint or in danger of passing out from lack of blood flow. His heart might be pounding, but no more than it would be after a long run or anything like that. The procedure had worked, even if it hadn't been what he expected it to be.

Michael was now the owner of a massive horse cock and a huge set of horse gonads. And Fran and Veronica had been awakened to the joys of sex. Everyone was a winner, in the end.

-x-X-x-

It wasn't very often that Fran was particularly eager for a checkup, especially for personal reasons. Though, it also wasn't very often that she did checkups multiple months after a visit. Most of her patients were one and done. Either because she'd done the procedure before and it was easy… or because she'd done all she could for them, and they were best left to their own devices.

But, as she and Veronica wait for Michael to arrive, Fran can't help but be eager. Indeed, she and her sister were MOST eager to get fucked by the well-hung stud again… though this time it would have to be anally of course, so as to avoid causing any harm to their babies. Fran had already modified their anal passages to be able to handle a horse cock in preparation for the visit.

Though admittedly, she was very scientifically curious about the children growing in her and Veronica's wombs. What sort of babies would a pair of artificial humans such as her and Veronica have with a guy who had a horse's reproductive organs? Honestly, Fran would have said it shouldn't have been possible for the pregnancies to happen in the first place, but obviously that had been disproven already.

With one hand resting on her pregnant stomach and the other interlocking fingers with Veronica, Fran has a pure, honest smile of happiness on her lips as Michael's car appears over the hill and begins to pull up to the Estate. No matter what happened next, she was very eager to experience it.

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