"A little more to the left. Perfect!" Tails tightened the bolts on the Tornado's new engine and sat back admiring a job well done. 
Sonic had been helping him with various upgrades in the past few days, but the engine was the final piece. Having an extra set of hands for the repairs was a welcome change of pace for the young inventor. They worked well together, and Tails always enjoyed hanging out with him. 
Wiping his forehead, Tails took a deep breath and stood up. Standing side by side with the blue hedgehog, he took off his tool belt and tossed it beneath the plane. 
"Thanks Sonic, it looks good now. I think we can call it a day." 

"Ok little buddy," Sonic replied cheerfully, "You need anything else today?" 

"Nah, I think I'm ok. Thanks."

"Ok then, see ya 'round," Sonic waved and darted off through the open garage door. Tails watched him as he disappeared out of sight. Despite liking some company for the bigger projects, the young fox couldn't wait to be alone today. Quickly running to close the garage door, he now could finally return to a new machine he had recently finished. In the corner of his workshop was a drop cloth covering a tall contraption. Yanking off the cover, Tails revealed a large capsule with a computer display attached to the right side. 

He had been working on a device he called a "replicator." If his calculations were correct it would allow him to create an exact duplicate of any mechanical object he placed inside. The goal was to be able to make new parts for his inventions more easily. Grabbing a nail from his workshop shelves, he placed it inside rhe and turned the machine on. 

"Ok, go!" Tails exclaimed, pressing the large green button. The machine flashed a bright light once and a digitized version of his voice called out. 
SCAN COMPLETE. 
The chamber door opened and Tails removed the nail. Closing the door tightly a white smoke filled the capsule and a countdown timer read out on the display. 
"2 minutes to replication," Tails said, reading it aloud. He smiled eagerly awaiting the test. 

After 2 minutes a bell chimed and the capsule opened. Out poured a cloud of smoke and Tails looked inside. There at the bottom of the capsule was a new nail. 
"Yes!" Tails shouted leaping in the air. His test was a complete success. Snatching the nail he added it to his shelf and quickly looked for other parts to try. 

Over the next several hours, Tails replicated almost every bolt, nail, screw, and small tool in his entire workshop. It worked so well he began to wonder what the limits of the machine were. He removed his shoes and tried to replicate them as well. While it did manage to create a replication, the materials the machine used were still mechanical in nature. The textures were similar, but not identical. It was truly an incredible invention. 

Just as Tails decided to call it a day, he took one wrong step as he was cleaning up. Still being in his socks, he stepped on a loose screw which jabbed his foot. 
"Ow!" Tails shouted, and he jumped backwards. Not looking where he was standing, Tails fell backward into the capsule and the door shut tightly. 
"Oh crap." Tails sighed. Rocking the capsule back and forth, the young fox did all he could to get the capsule to open. As the floor shook from the wobbling of the machine, a broom leaning nearby slowly fell loose. After a few minutes, the vibrations finally knocked the broom over and the handle fell directly onto the green activation button. 

Tails was temporarily blinded by a bright flash of light, and the capsule doors finally opened. Tails gasped for fresh air falling to the ground. 
"Oh thank goodness," he gasped, forcing himself up. He sighed and grabbed his shoes in one hand. "Guess I need to add a failsafe on the inside." The exhausted fox finished cleaning up, then headed towards the door to his house. Before leaving the garage, he closed the door to the capsule, but had forgotten to turn the power off. Exiting the workshop, he shut off the lights and closed the door behind him. Little did Tails know, the replication sequence had already begun. The machine's display read: REPLICATION IN 9 HOURS.

… …

Tails yawned, turning the lights on in his workshop. It was now the next morning and he had returned to build a failsafe switch on his machine. Passing by the capsule his eye caught a figure inside it, but he was still too tired to register the sight immediately. Reaching his workbench, his eyes suddenly shot open and he ran back to the machine. 

"What the heck!?" Tails was face to face with what appeared to be an exact replica of himself. He pressed his hands and face against the glass to get a better look. 
"That's impossible!" He shouted and quickly looked at the machine's display. There was a countdown timer which showed just 53 seconds left. His mind began racing, as he tried to rationalize what he was seeing.

After the timer reached zero, the bell chimed and the doors opened. A thick cloud of smoke poured out and the replica seemingly collapsed to the ground. Tails rushed to its aid, and examined the figure. Sure enough, the machine had replicated his body down to the smallest detail. Tails pulled off his gloves and ran his fingers through the replica's fur. It was soft, much like his own, but was still synthetic. The same could be said for his gloves and socks. Tails looked down and noticed that even his nether regions had been replicated as well. Was it just on the outside, or…
"It could be…" he mumbled. Just as he had reached for the replica's apparent genitals, its eyes opened and looked directly at Tails.
"Uh, Hi." Tails said. He lifted it up by his wrists, and pulled it up to its feet. Standing across from the replica, Tails tried to determine what to do next.

Guiding his double into his house, he took the next few hours examining it and running tests of various types. The replica seemed to be unable to think for itself independently. A huge relief for the young inventor. It was as if it was a blank slate…a hollow shell. However, it could move on its own and understand instructions. Over the course of the morning Tails managed to get the replica to mimic speech as well. Nothing too complicated, but enough to be sure it wasn't in pain…if it could even feel it. As it turned out it could not only feel a similar sensation to pain, but it seemed to produce tears and saliva, or at least a synthetic oil which resembled them. Tails began calling the replica "Miles." Since he rarely used his real name, he figured it suited his clone. 

There was still one final "test" Tails wanted to do though. His eyes continually glanced at the Miles' package. It seemed to be identical to his own, but he was unsure if it also had the same functionality as well. After all, he only designed the machine to replicate the appearance of an object, not necessarily the internal structure. His curiosity was getting the better of him, and he was ready to see just how life-like his clone was. 
"Ok Miles are you still doing ok?"

"Yes, Tails," it replied. 

Tails took a deep breath then continued. "Ok then. I need to make sure all of you works the way it should. This may feel strange, but please bear with me." 
Miles nodded and Tails took another deep breath. His heart was pounding as he knelt down and reached his bare hand up to Miles' tight ball sack. He rubbed his fingers across them, causing the two small orbs to pull upward in response to being touched. Tails' jaw hung open as he saw Miles' body react naturally. He then trailed upward to the sheath. It was indeed identical to his own. Nested in a short bush of pubic fur, and gracefully hiding a short red member. He rubbed around the opening seeing if Miles was as sensitive as himself. Sure enough as Tails rubbed Miles winced and the familiar red organ poked out beginning to harden. 

Tails gasped, wrapping his fist around Miles' shaft. It was the same 4 inches as his own with a plump knot growing inside the sheath. He could hear Miles' breathing increase as he rubbed up and down on his dick. 
"Miles?" Tails said, looking up at his double. "How does that feel?" 

"It's…agreeable." 

Tails smiled, "That's good. This is your dick Miles. You have one because you're a boy, like me."

"D…dick?" Miles repeated. 

"That's right." Tails continued pumping up and down as he explained things. "When you rub it like this it feels good, so you need to be sure to do it super often, ok?"

"O…ok Tails. I'll rub my dick super often."

"Good," Tails giggled. He squeezed a little and Miles released a clear oil from his shaft. Using his left hand, Tails scooped a little of it into his fingertips and rubbed it around. 
"And this is precum. You'll leak it out when your dick feels good like this." Miles nodded in understanding, his synthetic body beginning to react more naturally to Tails. The young fox was captivated by Miles. It was a strange feeling to be pleasuring what appeared to be himself, but it wasn't quite him. His heart raced from just the act teaching the innocent copy of himself about self-pleasure. He began to wonder just how far he could take things. 

By this time Tails' own dick had hardened out of his sheath. Pleasuring his double was turning him on in a new and interesting way. With his left hand, he began rubbing his own dick in addition to Miles'. Little did he realize, but Miles was watching him just as closely. 

"Is that your dick, Tails?" 

Tails suddenly froze. This was the first question Miles had asked him. Tails wasn't exactly hiding himself, but still. He was still a virgin, and the idea of showing himself to anyone made him nervous. Then again Miles wasn't some random person, he was…himself. That must make it ok, right?

"Y…yeah Miles. Here…" Tails let go of Miles and sat beside him. The two looked like mirror reflections, sitting side by side and fully erect. 
"We're the same Miles. So, I couldn't help but get hard with you. We're really sexy after all."

"Sex…y?" Miles repeated. 

"That's right." Tails couldn't stop himself now. Looking over Miles, his normally rational mindset vanished and his dark boyhood desires took over. Tails knew he liked other boys for a while now, and decided Miles would be the perfect partner for his pubescent curiosity.  
"Let me show you something, Miles." Tails reached over to Miles' left cheek and pulled him closer. Parting his lips, Tails slipped his tongue into Miles' mouth and pressed his lips against his clones'. It was actually his first kiss, and it was with…himself!

"Mmmmmhmmmm. Mmmmm." 

Miles was quick to catch on, and he wrapped both arms around Tails. He mimicked Tails, rolling his tongue together and pushing his own into the fox's mouth. Tails giggled through their kiss. He wasn’t sure if this counted as masturbating or not, but he didn't really care either. He was just letting his body think for him now. Breaking from the kiss, he looked deep into Miles' eyes and smiled.
"That's called a kiss." 

"Kiss feels good." Miles said. The clone was now flush in the face. Tails wasn't sure how, given that his counterpart didn't have blood to cause it. "I…I…" 

"Shhhh," Tails hushed him. "Just lay back and let me show you what it means to be a boy." 

Miles reclined to one side. Tails guided him back and spread Miles' legs apart, kneeling between them. Bending down, Tails licked the tip of Miles cock, tasting him for the first time. Miles said nothing, only smiled and watched Tails closely. Rubbing Miles' fuzzy balls with his right hand, Tails opened his mouth and dropped his muzzle down onto the 4 inch synthetic cock. It had a rubbery flavor, but was still similarly soft like his own. The oily precum was bitter and clearly not something as edible as his own. Making sure not to ingest it, Tails began bobbing his head up and down. 

"Mmmm…mmmmm….mm." Tails mumbled, sucking his clone. It didn't taste that good, but he could tell Miles was still feeling good regardless. Pulling his head off for a moment, he stroked him while checking on his partner. 
"You holding up ok, Miles? This isn't too much is it?" 

"Tails,  I feel strange…I…ANGH!" Miles' body suddenly shuttered and he released a few blasts of the same clear oil from his cock. It flew straight over Tails' shoulder and landed on the armrest of the couch.

"Whoa! Nice shot!" Tails gasped. Looking over his shoulder, he saw the liquid quickly absorb into the fabric. "Well, Miles looks like you can cum." 

"C…cum?"

Tails giggled and nodded. "How did that feel?"
Miles couldn't really process the feeling, and Tails knew it. However his clone functioned, it was clear that it could experience every sensation that he could. Tails' cock twitched and he looked down at Miles' tailhole. It puckered at him, inviting the young fox to enter. Tails was no stranger to playing with his own tailhole, and knew his double would find it just as enjoyable. Squeezing his own cock, Tails gathered some of his precum on two fingers and rubbed across Miles' Tailhole.

"Tails?" Miles asked, his voice sounding weaker now. 

"Relax Miles, this is gonna feel really good."
Miles again nodded and Tails pushed a digit into his clone. Miles gasped as his synthetic virgin tailhole was violated for the first time. His dick twitched, still hard despite having cum once already. Tails was quick to apply Miles' oily precum as well for further lubrication. It was actually the perfect amount of slickness for Tails to slip in a second finger. The young fox was surprised to feel that Miles' tailhole was just as tight and warm as his own. He flicked his fingers and sure enough felt a lump where his prostate should be. Pushing against it his clone gasped and shot a long stream of precum into the air. 

"Ah!" Miles gasped. The synthetic life form seemed well pleasured by Tails' actions. He didn't have the words to describe what he was feeling, but it was written all over his face. 

Tails, now satisfied that Miles was well lubricated, pulled out his fingers and sat back on his heels. He rubbed his cock with his right hand, coating it in his and Miles' fluids. With his left hand he tugged his sheath, releasing his throbbing knot. He was ready and eager to finally plunge his cock into another boy. 
"Ok Miles, I'm gonna put my dick inside you."

"Inside?" 

"Mmmhmm," Tails nodded. "Just relax and enjoy. Tails pressed his tip against Miles' tailhole and slowly pushed it inside.  They both gasped as their collective virginity vanished. Tails' cock slid inside up to his knot and was squeezed by the warmth of his double. It felt better than anything he had ever experienced before. Much better than stroking himself and far better than using a toy. 

Miles, having only come into existence that day, had nothing else besides his first ejaculation to compare it to. Despite that, he was already addicted to the sensations he was feeling. Looking up at Tails, he uttered one single word to his mobian lover.
"Yes!" 

Tails smiled and began thrusting his hips in and out, feeling the warmth and pressure over his entire length. It wasn’t long before he began to move faster and slam harder, his instincts taking over for his inexperience. Looking down at Miles, Tails watched as his stiff cock flopped back and forth from the motion of being bred. It turned Tails on even more seeing his own form be the one he was losing his virginity to. His boyhood throbbed wildly, releasing a steady stream of precum into his clone's body. 
"Miles!" Tails moaned, "This feels so good! I can't stop!"

"Harder Tails, harder!" 

"Huh!?" Tails slowed his pace realizing he never taught that word to Miles. His partner didn't let him think long, as its legs suddenly wrapped around Tails' back and forced him to return to pounding faster. 
"Ah, Miles!" Tails gasped, his knot now grinding against him with each thrust. He knew what was coming next, but no amount of research could have prepared the young fox for his first tie. 

POP

"AAARGH!" They both grunted as Tails' knot forced its way into Miles. Instantly it swelled larger creating even more pressure on both of them. Tails' legs shivered as he felt every nerve in his cock tingling. Miles clenched his teeth as his new body was pushed to its limit. The two of them remained still for a moment as they got used to the constant pleasure. It would be much longer though before they truly became one. 

"Sweet Mobius!" Tails gasped. "Miles, I'm…I’m…AAAGH!" The golden fox's body shivered as his boyhood released a blast of hot cum into Miles. Although he was young, Tails' cum was thick and there was a ton of it! It splashed into Miles' synthetic body, electrifying his internal sensors with pleasure. 
Miles' cock twitched each time Tails shot another stream, causing the replica to mimic him and released his oily cum as well. The two panted and moaned as their combined orgasms perfectly aligned with the other. Collapsing onto Miles' chest, Tails closed his eyes as the last of his cum dribbled out. 

After what felt like an eternity, Tails finally managed to compose himself. Still tightly knotted into Miles, he pushed himself back up until he was sitting on his heels once more. The movements caused him to tug Miles' body a little with his knot. Looking down at their fur, he saw the shimmering liquid which Miles had released staining them both. 

"Oh man, Miles…that was…" Tails gasped, still catching his breath. "...just…Wow!" 

"Tails?" Miles asked, looking down at their point of connection. "You are still inside."

"Yeah sorry about that," Tails rubbed the back of his head. Reaching down to Miles' hips he pushed on them while pulling on his still swollen knot. "Ungh. UNGH." Despite pulling as hard as he could, Tails was stuck for the time being. "Sorry Miles, I think we're gonna be stuck like this until my calms down."

"Because we're boys?"

"Hehe, yeah," Tails giggled. He leaned back down and laid on top of Miles once more. Kissing his nose he caressed his clone's soft furry ears. "Don't worry Miles, I'll show you everything about how to be a boy. You're just like me after all."

The two snuggled together on the couch for the rest of the morning. Their mirrored twin tails wrapped around the others' as their bodies kept the other warm. Although it was a bit of an accident, Tails never expected his little invention would have created a duplicate of himself. Let alone one that would finally give the young fox the lover he always dreamed of. Though his best friend Sonic held a special place in his heart, Miles was everything he needed and more. After that first morning, Tails and Miles would make love every day afterwards.