In the corner of Tails' cluttered lab, a blue hedgehog named Sonic sat on a stool, tapping his blue sneakers impatiently against the cold metal floor. The room buzzed with the energy of countless gadgets and gizmos, each beeping and whirring a unique melody in the pattern of science. Sonic's eyes darted from one contraption to the next, his curiosity piqued by every blinking light and unidentifiable button. The smell of burning circuitry filled the air, a scent that was oddly comforting to the speedy hero.
Tails, the young, two-tailed fox genius, was deeply engrossed in his work. His furry hands danced over a large control panel, his brow furrowed in intense concentration. Above the panel, a holographic display flickered with a series of complex equations that only he could understand. He was working on a new invention, a wristwatch that could potentially allow the wearer to travel through different realities. It was a concept that had kept him up for weeks, fueled by countless cups of his favorite energy drink.
"I didn't think you would be this focus on this time of thing." Sonic said.
"Well ever since you told me about your adventures in the shatterverse. I can't help but wonder if those realities still exist in some way. Maybe I can find them myself."
Sonic let out a tired groan. He had told the story many times before, but it never seemed to lose its novelty. It was almost as if Tails thought that one of his inventions could find those other shatterverse.
After a bit more time it seemed to passed Tails seemed to finish his newest invention. A wrist watch that makes the wear travel through different points in reality.
"Now we should test it out," Tails said.
Sonic was already putting on the watch. "Well, where to start?"
"Well you see this watch should allow us to communicate if needed. It can keep track of energy wave lengths from different universe..." As Tails keeps talking Sonic mind dozed off of.
"Hey Sonic! You got all that?" Tails asked.
"Oh...uhhh yeah!" Sonic give his iconic smile and thumbs up.
"Again we don't know what would happened. But I believe you can come back you always!" Tails flirts giving Sonic a kiss on the lips.
Sonic kisses the fox back. "See ya soon buddy!" With a press of a button the watch activates.
Sonic disappears into a blur of blue. The watch had done it! The experiment was a success. Tails can't help but feel excited at the thought of all the realities that Sonic could be exploring. He knew that Sonic would find a way back home, no matter what reality he was in.
Sonic found himself in a familiar city. It was New Eggyolk city and it looked different. No more red sky and there was more greenery around the buildings. Its like if a modern city and nature collided. That's when Sonic started to get excited as he wanted to see Nine.
So the blue hedgehog ran at full speed through the big city to find the fox's lair with mechanical tails, it only took him a couple of minutes to get to the same train tunnel where he found Nine for the first time and he even still had the same password as before to open the door of that base.
"It's good that you haven't changed the password, Nine" said Sonic as he prepared to enter the base.
As he did so, he saw that there was apparently no one in the place, but that was strange since Nine's lair was very clean and even more modern than the first/last time Sonic had seen it.
"Ehhh?... Hello... Nine, are you here?" said Sonic with curiosity and also with fear that something bad had happened to that same little fox.
But without him realizing it, Nine was literally up on the roof of his base, using his mechanical tails that had received several improvements, since they looked shinier and stronger than before. Besides, he was impressed that Sonic somehow managed to come here, but that in one way or another would help him to finally have the love of the blue hedgehog... and also something else.
"Hehehe, this is perfect" whispered Nine preparing to fall with style.
Sonic was already thinking if maybe Nine had gone out somewhere and maybe it would be better for him to come back later.
"Too bad, well, maybe I'll come back here later..." said the hedgehog but he was interrupted when Nine fell on top of him but without him getting hurt too much by the sudden weight of the fox.
"Ouch! That really hurt... Nine!!" he shouted with happiness while giving the fox a hug.
Nine blushed a little but after a few seconds he hugged the blue hedgehog back "Of course it's me or who else would it be??.... Knuxs?" Nine said and then laughed a little at his joke.
"And well... How have you been in the time I was in my dimension? You must tell me absolutely everything!!" Sonic spoke, still hugging Nine.
"Clearly I'm going to do it... but first could you let me go, I feel like you're squeezing me too much" Nine said, as he felt like he was suffocating a little.
"Oops! Sorry Nine" he released the shorter fox so he could breathe better. "Maybe the excitement of our reunion made me not measure my strength much"
"Don't worry Sonic, in fact, we're going to sit on my couch so we can chat more comfortably" the fox said.
The only two occupants of the den went to the rather nice couch of the owner of the place. When they were both seated, they were able to chat in a more relaxed way, and the blue hedgehog could explain why he had gone away for such a long time.
"You won't believe how much I missed you" said the hedgehog, giving Nine a friendly kiss on the cheek.
The fox's face flushed again. "And I also missed you... very much" Nine replied, looking a little embarrassed, and then looked at the floor.
Sonic noticed the fox's reaction. "Hey... are you okay?... It seems like something is bothering you"
"I guess...I am just a bit overwhelming seeing you again. But when we met. You told me I was someone special to you. But you've mistaken me for the version me in your world. Sonic I couldn't stop thinking about you even the first night when we..." Nine could finish his sentence out of embarrassment.
"Yeah it was great, you really rocked my world. I am usually use to being the top but having you fuck me like that with your big dick...I miss it. And even tho I do love Tails, he's not you...ya know?" 
"I know, I know, but... I just thought we had something... special" Nine said somewhat dejected.
"Hey, don't worry, I know you're going to find someone who loves you a lot" the hedgehog answered with his iconic smile.
At that point the fox technically nine-tailed asked him a question that came to his head. "Hey, I could never get it out of my head when you said that before our meeting you were an anal virgin" Nine said doubtfully "I figured that having basically the same appearance as you "Tails", we would also have the same dick size"
There the blue hedgehog got nervous and somewhat uncomfortable about this, since he promised his Tails that he would never tell anyone about his darkest secret... Although Nine being a version of him, theoretically he was not breaking that promise.
"So... okay, I'm going to tell you something but let's keep it between the two of us, okay?
"Uh... it's okay Sonic"
"... Actually... Tails..." She looked around to try to get rid of the nerves of what was possibly a betrayal of her current boyfriend's trust. "... He has a dick that's too small".. Sonic said this already half sweating from revealing the dark secret of his two-tailed fox.
Nine was processing this information as fast as her brain could do.
"How... small would you be talking about?" said Nine.
Sonic disappears in less than a second and reappears with a 30 cm ruler and using his memory he places his finger on the number 7.5 of the same ruler.
"Damn he's that small, how can that even be, we are like the same person. My dick is way bigger than!" Nine said amazed.
"Oh yeah.. he's 3 inch of nothing isn't anything like the 11 inch masterpiece you're packing!" Sonic said licking his lips. "Since I am here Nine and you're not busy. how about you help me blow off some steam?"
"Well, it's not like I have anything to do, so... sure" said the nine-tailed fox.
The blue hedgehog quickly undressed and sat back on the couch. The fox's 11-inch monster was already ready for action. As Sonic can see the outline of his cock through Nine's pants. "I really need your cock, Nine. I haven't been fucked so good in my little blue ass in a long time!"
In that wild kissing session, Nine felt the hedgehog's cock that was getting hard, its size was a very decent 6 or 7 inches but it couldn't compare to the smaller fox's huge cock.
"You're still a pretty good kisser, Nine."
"Well, with an incredibly sexy hedgehog who urgently needs attention, it helps a lot."
"So... we better get rid of what we don't need," Sonic said while winking.
Nine just nodded as his took off all the clothes his had, including his shoes, socks and even his gloves and left aside his metallic tails. Obviously Sonic did the same although she only had his classic sneakers, gloves and socks. Now they were both naked, Sonic couldn't stop drooling at the sight of Nine's rather charming body and especially that fox cock he was showing off.
"So... now what do we do Nine?"
The fox was thinking about what to do, until an idea came to him. "Why don't we have you suck my cock first and I'll suck yours at the same time. Whoever makes the other cum first will be the passive one during the entire sex session we're going to have. Do you accept this little game?"
"Hehe, sure" the hedgehog accepted the bet "It's been a long time since I haven't had a good blow job"
With that the two competitors took each other's cocks and began the race, which would last a few minutes, with their mouths.
Both of them were enjoying themselves, the taste of each other's penis was driving them crazy, it had been a long time since they had sucked cock and Nine had forgotten what the taste. They were on the bed, in the 69 position. Sonic on top and nine the bottom. The blue hedgehog was using his tongue to lick the length of Nine's cock. He could hear the fox moan with each passing moment. Sonic's own member was receiving a lot of pleasure from the fox's mouth.
"Mmmph..."
The taste of Nine's cock was driving Sonic crazy. He wanted to take more of the fox's massive length inside his mouth.
"Mmmmmm!"
"You're not... mmph... going to win..." said Nine while sucking the blue hedgehog's dick.
Nine had already gotten used to the taste and now he was moving his tongue with more and more passion. His lips were tightly wrapped around Sonic's throbbing cock.
"Hmmmmm... Mmmmmmph!"
He had missed the taste of the blue hedgehog's cock as well as the feel of Sonic's mouth around his member. He can hear him choking but taking much more of his fox cock.
"Haaa! Ha-haaa-hmmm!"
Nine's dick was starting to swell, and he could feel his climax coming. But he wanted to make Sonic cum first. So, he increased the pace and sucked harder.
"Hmmmmp! Hmmmphhmm!"
Sonic was moaning loudly. Nine's lips felt amazing on his cock. He could feel the fox's hot breath on his crotch as Nine continued to deep throat him.
"Haaaa! Hmmm! Mmmmmmmmmm!"
Nine was getting close to his own climax, but he knew that Sonic was getting close too. He could feel the hedgehog's cock throbbing in his mouth. He knew that the next thing he was going to feel was a thick, hot load of cum down his throat.
At that very moment, he managed to feel the hot and thick hedgehog semen enter his entire throat that shot shots after shots of semen that were a total of 7 times.
Sonic couldn't believe that he had lost to Nine but for him it wasn't that important and more so when the fox couldn't hold back either and came inside the hedgehog's throat, which basically seemed like the fox's cock was a fire hose due to the enormous amount of semen that Sonic had to taste and swallow to the point that his stomach was filling up with the passing of the seconds until he couldn't take it anymore and released Nine's cock from his mouth, watching with total excitement that he continued to cum several times, filling his face and chest with the fox's delicious protein until he stopped.
Nine breathes repeatedly but at the same time with satisfaction at having won the competition even if it was just barely. "Wow, you almost beat me Sonic" said Nine while tasting the remains of the hedgehog's semen that was left from the same cock.
While the male blue hedgehog was swallowing the fox's semen and was literally amazed by its taste. "If losing this means I'm going to have more of this, that's more than fine with me."
Nine was happy to see Sonic happy and at the same time he got harder watching him play with his semen... But a question came to him that he had to tell him no matter what.
"Hey Sonic" said Nine
"Yes, my stud fox?" said Sonic
"What we're doing... could it be considered cheating on your current partner?"
There Sonic really had to think very carefully about that answer, since the slightest mistake or confusion in his words could ruin everything, not for nothing he already learned that lesson in the past.
"Thinking about it... maybe. But I honestly don't care Nine."
"I thought so"
"What did you expect, Nine?"
"I just wanted to make sure you weren't doing something that you might regret later."
"Well, I don't regret anything right now."
"You don't?"
"Not at all."
"Really?"
"Yup."
"So, are you sure you want to continue?"
"Sure I do."
"Okay, then... Let's do this."
With that, Nine took the blue hedgehog by the shoulders and pushed him to the bed. But then the fox had a naughty idea. 
"Hey wait don't we record our endeavors and show them to the other me. I want to show him how much you love being fucked by me!" Nine said with a devilish smile.
Sonic looked at him with a mix of surprise and excitement. "You really want to do that?"
"Yeah, I want to show him what a real man is capable of and I want to get a full view on camera of me pounding your ass and filling it up and watching my cum pour out of you!"
Sonic was getting really hard hearing all of this, and he really want to do this. "Holy shit! This sounds like the ultimate cuckold!"
Nine nodded with a devilish smile, already getting ready to set up the cameras. "Let's make sure we get every angle, every moan, and every drop of cum," he said, his eyes glinting with excitement. Sonic couldn't resist the thrill of the idea, his heart racing as he thought about the look on Tails' face when he sees the footage. They quickly set up the cameras, placing them at various spots around the room to capture their passionate encounter from every possible viewpoint.
Sonic was very impressed by the large number of cameras that Nine had since there were close to 100 cameras.
"How and why do you have so many cameras, Nine?"
"Well, I had a lot of free time since the chaos council disappeared and I built them out of boredom and why... well, we're about to answer that question." Nine answered with a lustful smile.
The hedgehog watched as his technically lover advanced like a true predator heads towards its harmless prey, who in this case was him. So the fox pushed the hedgehog onto the couch.
"Now open your legs for me now, hedgehog." Nine said with an authoritative voice.
"Of... course" Sonic answered with touches of nervousness but at the same time lustful and heeding the fox's orders, he makes his legs open in a V shape for Nine's excitement.
There Nine got on top of Sonic, who the latter could feel the huge cock of the former.
"Quick Nine, put your huge Chillidog inside me."
"Really??? What will your little boyfriend Tails think about all this?" Nine said with a fake guilty tone.
" Fuck Tails!!!! He literally never even wanted to fuck me from behind, it was always me who had to fuck him in his ass!" Sonic answered without thinking about the consequences.
"Wow, seriously my other "me" is a complete loser."
"Obviously! Literally before dating me, he was straight but thanks to his insignificant baby dick all his ex-girlfriends broke up with him and went for other better guys... Well, this hedgehog is going to do the same "
Nine nodded with a smirk, taking a moment to lubricate his massive cock. Sonic looked up at him with lust-filled eyes, eagerly awaiting the feeling of being filled by the nine-tailed fox's length.
"Are you ready, Sonic?" Nine asked, his voice deep with anticipation.
"Yes, Nine, give it to me," Sonic replied, his eyes never leaving the fox's powerful body.
With one leg on either side of Sonic's hips, Nine positioned himself at Sonic's entrance, the thick head of his cock pressed against the hedgehog's most sensitive spot. The camera lenses captured every detail of their interaction, from the beads of sweat on Nine's forehead to the passion in Sonic's eyes.
Slowly, Nine began to push forward, stretching Sonic open as he entered him inch by inch. The blue hedgehog let out a low moan, his body arching slightly in response to the sensation. He reached down to grip his own erect cock, stroking it in time with the thrusts of Nine's hips. The fox could feel his length sliding into the tight heat of Sonic's body, his eyes closing briefly as he savored the moment.
"Ohhhh Nine, yes! It feels so good!" Sonic cried out, his body shuddering with pleasure.
"Fuck yeah, take it, Sonic," Nine growled, increasing his pace. The sound of their bodies coming together echoed through the room, mixing with the blue hedgehog's cries and moans.
Nine continued to pump his cock in and out of the blue hedgehog's ass, relishing the sensation of his hole being stretched and filled.
"Damn, your ass is so tight, Sonic," Nine said, his voice dripping with lust. "I'm going to fuck you so hard, you're not going to be able to walk for a week let alone run."
Sonic moaned loudly in response, his hand moving faster on his own cock as he neared his climax.
"Ahhhh Nine, I'm going to cum!" Sonic cried out.
"Me too!"
"Yes, do it! Fill me up!"
"You want my cum? You better beg for it, Sonic."
"Please, Nine, fill me with your cum!"
With a roar, Nine reached his orgasm, his thick load filling Sonic's ass as the blue hedgehog shuddered beneath him. Sonic could feel the fox's seed coating his insides, his own climax hitting him like a wave. He shot his load over his chest and stomach, his body trembling with the force of his release.
"That was amazing, Nine," Sonic said, still breathless.
"It was," Nine replied, a satisfied grin on his face. "I haven't had an orgasm like that in a long time."
Sonic grinned, his body still tingling with the afterglow of his own climax. "I'm glad I could help," he said, winking at the fox.
"I'm going to upload all the videos and photos from this sex session and send them to the version of me in your world. So he can know what a real man is capable of, hehehe," said Nine.
Sonic just smiled mischievously just thinking about Tails' reaction to all that, he might even break up with him if he wanted to, but he just doesn't care, especially when that means spending more time with a real fox.
A few days later.
Tails was in his workshop putting together another one of his typical scientific devices that made him very happy, although this time he wasn't so happy, since his boyfriend Sonic hadn't returned from ho the different dimensions/universes yet and that was already worrying him, but he tried not to think about it too much, since he was practically Sonic and he could always trust him.
“Come on Tails, don't keep distracting yourself with that, Sonic is going to come at any moment.” he said that to himself.
Then he heard the doorbell ring, which meant that someone wanted to enter his house, so the two-tailed fox left what he was doing and walked to his front door to open it.
He found a package delivery man carrying a small box. “Is Mr. Miles Prower here?” said the delivery man.
“That's me but I actually prefer to be called Tails. “ said the same man.
“Whatever, I just came to deliver this package, so sign these papers. “
The fox listened to what he was told and after signing the papers, they gave him his package and he saw how the delivery man left the place in his van.
" .... Well, let's see what this box contains." Said the fox entering his house and then closing his door.
Tails sat on his couch to get comfortable when he opened the box and raised an eyebrow when he saw that it was a USB that looked like a very normal one, so he got up to go get his laptop that he had made himself and in addition to a mouse, he placed it on his nightstand, turned it on and put the USB in the input of the same. He saw that a file had come out that said "Sonic's Funny Moments", Tails was curious and moved the mouse to open the file, in it came out a bunch of videos that were only numbered from 1 to 100... Then Tails pressed video number one.
On the screen, Tails saw Sonic and Nine in a very... intimate moment. He could see their expressions, hear their moans and dirty talk, and it all felt so surreal. Tails stopped the video after only a few seconds, unable to process what he had just seen. How could his best friend/boyfriend, have done something like this?
Tails was shocked, hurt, and confused. He couldn't believe that Sonic would do something like this, I mean he didn't seem the type. Even though Tails was watching a technically watching himself fuck Sonic. It still hurts...like a lot. Tails then looks down and blushes.
He notices he has an erection. Could it really be the video he's watching. Did he like watching Sonic get fuck by his big dick double ganger. He starts rubbing himself through his shorts.
"Ahhhh ahhhh ahhhh..."
He kept rubbing his dick getting harder and harder. His dick was getting painfully hard. He had to masturbate to the sight of his best friend/boyfriend get fucked by a big-dicked version of him.
Tails started to unbuckle his pants and took out his cock. It was big. Not as big as Nine's but it was still big. He started stroking his cock slowly.
"Mmmm, ohhhh Sonic." Tails moaned.
He sees Sonic swallows Nine's cock and getting face fucked by him. As he continue to watch other videos he sees other version of himself come into view. One as pirate, and this must've been Sails. A pirate version of him that exist in the multiverse that Sonic told him about. Another one was him that had tribal markings and make up. This must've been Mangey.
This was crazy and amazing. He can see him fucking all the other Sonics. Seeing how Nine fucked his Sonic's tight little ass.
"Ohhhh, Sonic ahhh."
He was jerking off harder and harder. The pleasure was intense. His hand was flying up and down his cock. His dick was so hard. He couldn't stop watching. He was getting close.
"Oh, I'm gonna cum!"
His hand was a blur. The images on the screen were burned into his mind. His orgasm was building. 
He shot load after load cumming on his hand and on his desktop!  After an hour, Tails had filled his laptop and parts of his body with his own semen, he himself should be angry with Sonic for having cheated on him with not one but with 3 versions of him from other universes but at the same time his mind was filled with images where he was tied to a chair watching how Sonic was in an orgy with the other 3 Foxes while they used Sonic in multiple ways using their huge cocks that eclipsed his cock but this only made him more erect. This and more scenes went through Tails' dirty mind.
"Hehehe... Maybe... it's a good idea that next time I go with Sonic". Tails said while I fell asleep from the exhaustion of having cum a lot, just thinking that this time being a cuckold was not as bad as the other times.
The end....for now.