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A girlfriend and boyfriend are sat alone in a room, the girlfriend's room to be more precise. No one is home, and they have something kinky planned, something very kinky indeed.

The boyfriend is laying on the bed fully clothed, with the exception of shoes of course. The girlfriend, similarly dressed in casual cloths; only with a skirt, is sitting on top of him in a suggestive position for the intended act. But she giggles excitedly and gets off of him, running to a drawer on the other side of the room to fetch something. Sex is definitely on the menu, but they have something else in mind for tonight.

She returns to her lover, now sitting on the bed with his feet on the floor. She sits next to him with a small item in her hand, an injectable mutagen, the outline of a dinosaur on the cardboard outer layer; housing the small sag of fluid inside. They had played with this idea for quite some time. Tonight however, they had gathered up the bravery to actually try it.

There is a moment of discomfort as the girlfriend injects the mixture, sealing what will soon occur. She looks to her boyfriend, seductively grinning with bright red cheeks. This was the sort of thing people would never admit outside the bedroom; and that taboo nature, the naughtiness, made it all the more exciting.

Even before the injection took affect, the two of them began the foreplay. Passionately kissing and wandering hands groping at private areas. Unable to contain their excitement, even before she was ready. It wasn't long before the first changes began to appear, a slight scaling of the skin and claw growth on her finger nails. The boyfriend redirected the attention of his hands from her breasts downward, and began to rub up and down the sides of her body.

Both of them enjoyed the unusual sensation of skin on scales, as they increased in density and spread across her delicate body. Those hands explored further downward and below her skirt. A moment later to be joined with her own, as he rubbed against her scaly private parts. Foreign pleasure grew in her loins as alien nerves and skin appeared in place of her already well tested human reproductive anatomy.

As her moans grew in intensity, they would have been forgiven for not noticing her skirt was gradually raising behind her buttocks. Like a phantom 3rd party taking a peak, her skirt rose until the tip of a forming tail could be seen just peaking from under. Rising, getting stiffer, getting heavier as it grew in size and mass.

Only when the first rush of pleasure struck her did they notice this desired development, as the growing new limb thrashed side to side in response to the orgasm. The simulation announcing the tails presence to the rest of her body. She looked back with a flushed face, the boyfriend taking a slight peak behind her as well, them both grinning in unison.

She stood up on the bed, adjusting her balance on the soft surface; with the growing weight behind her in mind. The tail instinctively raising up high to assist in the balancing act the best it could, despite its undeveloped state. She then reached down below to remove her skirt and underwear, providing growing room for the new limb. In doing so, also providing an inviting and interesting view under the skirt for her boyfriend below her. Not that he hadn't seen her at this angle before, but things were new down there; and getting increasingly so by the second.

The skirt and underwear discarded; she resumed sitting on her boyfriend, only this time in reverse. She was granting him a good inspection of the new tail, as well as an opportunity to get up close and personal with his partners still changing private area. Though as she manoeuvred herself for this, he couldn't help but notice her less than human feet, large claws with thick scaly pads busting through delicate socks. Those could most certainly do some damage, but his dinosaur he need not fear. Instead of fear, taking a moment to massage the base of her still developing tail. Exciting new nerves as he moved his hand back and forth down its increasing length, to the sound of his increasingly reptilian girlfriend enjoying the sensation.

That thick tail raised, pressing against his hand for maximum enjoyment. In doing so; advertising another area of interest. He focused his hands attention at the base of her tail, strongly massaging its base; to which she lifted it even higher in response. Just the reaction he wanted. He moved his face in and licked across her moist scaly lips, before embedding his tongue inside for a little exploration. To which she loudly called out, breathing heavily in response to the unexpected invasion of her privates.

He looked over a fattening reptilian thigh with a smile, her body having changed rapidly over this time, to greet his girlfriend's face looking back at him with a pleasured and panting expression. At least, that is what he thought it was, as her once soft human face had pushed out and covered in scales. She was no longer recognisable, more reptile than human, but still delightfully attractive in the eyes of her herpetophile boyfriend. Large lizard eyes focused on him and scalie lips parted, to which she only asked for more in a yearning manner.

He will give her more. But he had waited long enough; and she was looking oh so inviting. He manoeuvred himself to get off the bed, a large reptilian leg held high to allow his exit from below her. He then assisted her in leaving the bed. The now very long and thick tail running along the wall as the meaty dinosaur rotated, large clawed feet resting on the soft carpet material below.

She stood there in front of him, quickly nearing the end of her transformation. Her posture had altered dramatically, looking more like one of those dinosaur drawings from a history book. She was quite large, quite intimating to the average onlooker. Quite magnificent in the eyes of her human mate.

The mutagen had done its work, it had taken her human body and reshaped it into a hybrid dinosaur that any herp lover would die for. Despite the massive claws, the sharp teeth, the body built to hunt and kill. She was in there, his girl, and she was enjoying being in that form as much as he did looking at it. Though the t-shirt and bra had lived past their use, not being very fitting for her new form, so he assisted the dinosaur female in their removal. At last, bringing her to full nudity; as nature intended.

And with that he couldn't take it any more. This mighty dinosaur female was ripe; and he wanted her so badly. As much as she clearly wanted to put those new privates to the test, as she turned to rest her upper body on the bed, with those thick strong thighs spread apart; and a delicious meaty tail curved high for easy access. His privates were burning in anticipation; and he approached, running his hand along her raised tail in appreciation of it as he got into position.

A moment of adjustment and finally; his manhood spread that lizard apart, burying as deeply into her as their different anatomies would allow. The hybrid gave out what the boyfriend assumed was her equivalent of expressing sexual relief, as those freshly developed and sensitive genitals were penetrated for the first time. She was as if a virgin, and he was her first lover.

A moment of stillness, a human male with a large thick tail at his side, his penis throbbing inside the treasure of his reptilian mate. A moment of stillness, of anticipation, before finally he pulled back; and thrust into her inner depths again. Followed by another, then another, until finally a rhythm of intercourse had begun. Scaly lips repeatedly being spread apart by soft human male genitalia, thick and strong reptilian thighs edging that little bit wider; as the female resting on the bed grunted at each push inside her.

The human male enjoyed the moist texture of reptilian innards, as his penis slid into foreign depths again and again, excitedly exploring his exotic sexual partner. Perhaps enjoying it even more was the freshly transformed dinosaur hybrid. Given the opportunity to experience the full physical sensations of a long extinct species, as well as being intimate with her lover. As enjoyable as both the new body and mating was, it was how they interacted that made the whole experience so worthwhile.

Her thick tail bobbing and swaying behind her, its close proximity to her genitals below; creating a delightfully pleasurable sensation running along the underside of her tail. The strong digitigrade legs, straining with sensation; as sharp claws embedded themselves deeper into the carpet with each thrust. It all combined to offer pleasures alien to those she had become to expect from her human body.

Humans mating with the transformed, the transformed mating with the transformed. People exploring the sexual delights of the animal kingdom, together. Looked down on and taboo may be, but an experience now that she has tasted; she could not deny herself of indulging in.

With that she cried out in pleasure and joy, though with her new body; it was more of a roar. At that moment she had let go, at least for a short period of time. Reverting to a lustful and wild animal, forgetting her former human life; and existing solely for primal gratification. Not that the boyfriend noticed his girlfriends submission to the beast within, as at this point he was hanging onto her strong tail, using it to assist his thrusting into the beast more vigorously.

Two different forms, one human and one former human, pressing against each other in extacy. The sound of human moans and feral roars, the carpet shredding underneath sharp claws. Her inner most depths clutching and squeezing the mans cock, pushing it to its orgasmic breaking point.

The mans moans grew in intensity, until the inevitable. A burst of hot fluid, an ejaculation of intense magnitude, coating the lizards depths in human seed. Her insides instinctively drinking at his cock to no reproductive gain, but a most rewarding experience for both parties none the less. He buried himself into her reptilian slit a few last times until he was spent. Fatigue quickly catching up with him, now that the sexual high had begun to pass.

He pulled out of her, to the sound of a satisfying plop as her tight cum drenched lips finally closed again. Both of them panting deeply in unison. He looked on at her long tongue reaching out with each breath, until finally she turned to him with a very satisfied reptilian grin. Her rear end left his privates as she turned around to meet him face to face, before strongly nuzzling him; which seemed to take him by surprise.

It had been a most satisfying and enjoyable experience, one they would not soon forget. They still had a few hours left in the transformation, so decided to spend them curled up on the bed together. Exploring the rest of her body, until finally she had to revert back into her former human self. She made sure to move and flex her tail often, taking full advantage of the exotic limb; until it was taken away from her.

How could something that felt so good be so wrong? Two consenting adults, passionately loving each other in the most intimate sense; in the privacy of a bedroom. One can understand people taking issue with the idea of a human laying with a beast, but there is a human inside that beast, and the form was only temporary. Given the position of humanity in the animal kingdom, the advancement of the sciences, why not have a little fun with nature?

He cuddled with the dinosaur on the bed, cuddled with his girlfriend. It would be sad to see that herp body go, but there would be many opportunities in the future for them to be reunited again.