Raptorization 
The room was dimly lit, Ray was stirring from his deep sleep and when he awoke, he found himself strapped to some kind of table and stripped of all clothing. 
He looked around and saw that the room he was in was quite large. Upon noticing the window above with some shadowy figures in the room, he realized this must've been some kind of operating room. 
Suddenly upon hearing a whooshing sound, he heard a door opening and in walked a very bizarre creature. It was a dinosaur, a velociraptor to be precise, it had shiny brown scales and was in a more human shape than like he had read in history books and wearing some kind of lab coat. 
As it got nearer, the raptor had  grinned upon seeing Ray awake. It then ran its clawed fingers all over Ray's body from his chest before poking and prodding his manhood, the claws weren't hurting him but a chill ran down his spine as he was molested by the dinosaur. 
"Listen man, I dunno what this is about, but I for one don't appreciate being held here against my will! What do you want from me!?" 
The raptor put its finger on Ray's lips as if wanting him to hush up, it then craned its neck close to Ray's face and gave him a lick, giving an almost lusty growl. 
Ray shuddered as the raptor tapped on the keys of a computer keyboard and after a few blips and beeps, a screen depicted a human body figure with an arrow next to it pointing at the shape of a raptor. 
Then Ray saw some kind of pumping device being rolled out, the raptor then grabbed a tube, placing it on its pink, pointy dinosaur dick, it then grabbed another tube placing it on Ray's own dick. 
The human shuddered as the raptor once again fondled his sack after placing the tube over his cock. 
"Wh-what is this? What are you gonna do!?" He shouted. 
The raptor just raised a finger motioning him to give him a second, it then pressed a big red button making a buzzer go off, then the words "Semen transfer commencing" showed up on a screen on the device and the tube on the raptor's cock began to suck away. 
The raptor growled and murred as it jerked itself into the tube, after awhile of sucking, its seed was pulled out from its cock and went into the machine before it went out the other tube that was connected to Ray's cock. 
And all Ray could do was shudder and moan as the hot fluids were pumped into his own shaft. The pumping slowed to a crawl. And the tube was removed from both shafts. 
Then the raptor stood by Ray and rubbed his chest with a claw as Ray breathed heavily feeling tingly from having the raptor's seed pumped into his cock. 
Suddenly before his eyes, his groin started to feel funny and started shifting, his balls receded becoming internal while the foreskin of his cock faded leaving his erect cock feeling a breeze, it then changed some more growing more pinker and pointy. The skin around his crotch was forming the same leathery texture as the raptor's underbelly. 
Then brown scales began to form down Ray's legs and around his back, the raptor ran a claw up and down his abdomen as his feet cracked and shifted, the scales forming as his toes merged, a powerful, long thick claw growing out of his big toe while the other toes growing claws of their own, he had three toes now the same as the raptor. 
The raptor ran its claws down the soles of Ray's changed feet as his arms and hands began to change, growing more brown scales, his fingers cracked as his middle and ring finger fused, sick and deadly claws growing out. 
Ray was breathing more and more heavily until his tounge ran across his now sharpened teeth, the raptor then licked his face again as his face began to change, stretching out becoming a long and broad dinosaur snout, he let out a yelp as his jaw cracked and shifted but it sounded like a tiny raptor screech, he then shut his eyes as his hair fell off and when he opened them up, they were a feral pale green with slit pupils. 
And finally his thick and powerful dinosaur tail grew out long and swishing back and forth. 
Growling and hissing, the new raptor looked up to see the raptor doctor grinning at him. 
"Yes... this procedure was a success if I do say so myself." It said, rubbing the new raptor's pecker. 
"Rrrrwhy would you do thissss to me?" Spoke Ray, having difficulty speaking with his new dino snout. 
"All in due time, my pet. For now, just feel the pleasure of your wonderful, new, magnificent raptor anatomy." It purred before leaning in to kiss Ray's raptor lips. 
Soon both raptors got frisky and were grinding each other's pricks, they both fucked and rubbed until both cried out in orgasm and shot their seed at the same time. 
In a lusty haze, both raptors got up and the one in the lab coat led the new, transformed raptor out the door. 
"Well now, I believe you'll do quite nicely in scouting for subjects." He purred 
"Rrr, yes sirrr." 
"By the way, I'm Lazarus. And your new name will be Skirix." 
So Lazarus and Skirix headed down the hall as the doctor told his pet the many things he needed to know about scouting and capturing new subjects. Thus began the cycle of raptorization.