Hello! Thank you for your interest in this fic.

Since seeing Sonic and Mumen Rider in One Punch Man, I've always wanted to write a fic with a wild delinquent Sonic. I thought maybe the warm, kind-hearted Mumen Rider would suit him well.

A lot of information in this fic were only searched online so they might not be accurate. Please forgive me for that.

Anyway, I hope you enjoy reading this!

I'm busy but I'll try to update as fast as I could. :)

DISCLAIMER:
One Punch Man is not mine! This is a fanfiction. Only the plot and the Original Characters are mine.

WARNING:
This story has violence, strong language, sex, and mention of drugs. This also contains toxicity (toxic relationships). You have been warned. If you are not okay with any of the above, please do not read this fic.

Also,
IF YOU ARE BELOW 18 YRS OLD, PLEASE DO NOT READ THIS FIC!

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Heat traveled under Sonic's belly. The toes inside his sneakers curled in pleasure. His stiffened cock throbbed, veins visible and defined. But it wasn't enough. He wanted more. So Sonic placed his hands at the back of the boy's head and pulled him closer, making the boy take in his entire penis.

"Yes..." he hissed.

The black-haired boy coughed while being choked. Tears slid from his ugly brown eyes, but Sonic didn't care. He was feeling good. At last, he felt the beginning of his second climax.

"Suck harder," Sonic commanded and the boy did. "Fuck, yes."

He leaned forward and trembled as he emptied his cum inside the boy's mouth.

Fuck.

That was good.

Immediately, the boy tore his head from Sonic's grasp and vomited on the floor. He heaved as he cried.

And it pissed Sonic off. Never mind zipping his pants. He walked toward the black-haired boy with his limp penis dangling between his thighs. "Hoy," he said as he stepped on the boy's head, the vomit only a centimeter away from his face. Sonic's voice was dark when he asked, "Who told you to throw up my cum? Drink that all up."

"B-but that's vomit-"

"Are you saying something?" Sonic stepped on the boy's head harder. He could kill the fucker. Break his skull and crush his tiny, little brain. Like how he would kill a cockroach. Yes, the sex was good but he could always find someone to suck his dick.

The black-haired boy must've realized the gravity of his situation so he sniffed his snot and exclaimed, "O-ok, Sonic. I-I will do a-anything for you."

Sonic grinned and released the idiot's head. He watched with satisfaction as the boy slurped the cum on the floor, looking green with disgust.

"How evil~" Hammerhead entered the storage room without warning. He was smiling when he saw Sonic ordering the bullied something awful again. Hammerhead was a big, bulky high school student with a shaved head and disgusting face. He was a repeater. Had been spending many years as a high school student and had no intention to graduate at all.

"Why the hell are you morons here?" Sonic brushed away the strands of hair from his face. Sweat made his hair sticky, and as much as he liked it long, he didn't like it when it got stuck on his face. After adjusting his bangs, he glared at the three unwelcome visitors once more. "Are you here to steal my fun?"

Spiky pink-haired Boros flopped down the battered couch beside him. "We're not interested in your boy toy." He took something from his pocket. Fine white powder sealed in plastic was placed on the chipped wooden table near them. "We brought some."

Now, that's awesome.

Sonic grinned. Coke's expensive but there were ways to get money. The problem was finding a seller with quality coke. Some mixed it with too much flour or baking soda or some other additives. Seeing the packed white powder on the floor, Sonic knew they were good. Boros had a knack for beating someone into a pulp if he wasn't satisfied with his transaction.

And, besides, Genus was here. The bespectacled teen was a genius and he used that head of his to help criminal organizations in the black market.

When Sonic's toy was done eating up the cum he vomited, Sonic stood up, took the boy's collar and threw him outside the storage room. He didn't need him anymore. Not now, at least. Something better was patiently waiting at the wooden table.

Within seconds, the powder was lined. Boros, Hammerhead, Genus, and Sonic sniffed a line of coke and let it run through their system. Almost ten minutes had passed when the drug took its effect on Sonic's body. He felt elated, pupils dilating. A hand encircled his waist. It was Boros, pulling him closer for a kiss. Feeling high, risky, and fucking horny, Sonic let the boy claim his lips. Their teeth clashed and their tongues played with each other. It was a messy, hungry kiss. Sonic caught Boros' tongue and sucked it hard.

Genus knelt on the floor and took Sonic's cock in his mouth as he jacked off. Hammerhead opened his fly and guided his penis into Sonic's ass. He penetrated the dry hole and started thrusting in and out with so much force that Sonic pulled his lips away from Boros to yelp and scream.

With his senses heightened, the sex felt more intense than usual. Genus sucked the tip of his cock with wild enthusiasm and Hammerhead kept on hitting his fucking prostate. Sonic's eyeballs rolled with pleasure. The fucking was too much. Hot blood ran through his veins and settled in his throbbing cock. The raven-haired teen arched his back and leaned into Hammerhead's embrace as the bulky man played with his hardened nipples. Sonic squirmed with the touch but the man held him in place.

Boros went down to the floor and started fingering Genus' ass. The act made Genus lose his focus. His teeth scraped Sonic's stone-hard cock.

Intense pleasure with the hint of pain made the raven-haired boy lose it. "Fuck!" Sonic exclaimed as warm cum shot out from his penis. His hole tightened and Hammerhead grunted as he fucked him harder. "Wait!" Genus decided to place his hole over Sonic's already sensitive cock. The fucking bastard rode him like a cowboy as Boros took the bespectacled teen's head and inserted his own cock into Genus' mouth.

Sonic's penis was hard again. For a long time, he reached climax after climax.

Fuck, sex was the best.

Sonic had no particular preference when it came to sex. He could reach a satisfactory climax when fucking or being fucked. He was okay with either a man or a woman. Gender was irrelevant. Any position was okay. Anything was alright as long as he could get pleasure from it.

Because Sonic was a plain sex addict.

When the high left them, the group of delinquents separated their bodies away from each other. They experienced the crash. Sonic felt down and shitty. Coke could increase sex drive, but they all knew taking too much would soon affect their sexual desire negatively. They heard about cocaine addicts having a hard time reaching climax or suffering erectile dysfunction. Something Sonic absolutely didn't want to experience.

But he just couldn't cut off inhaling or injecting coke. He loved the high he experienced with the drug.

Because he was also a drug addict.

They slept inside the cluttered storage room. When morning came and they started to make themselves look more presentable, Genus delivered the bad news, "We can't buy in the Sakamichi district anymore."

Sonic's brows furrowed. "What the hell do you mean?"

It was Hammerhead who answered, "A high school kid on a bike has been patrolling the area and reporting suspicious actions to the police."

A fucking kid was patrolling the district?

Why the heck would he do something like that?

"Why?" Sonic asked.

Genus put his eyeglasses back. "I believe he wants to be a hero of some kind. He's new in the city. Just moved here a week ago, but rumor has it he's helped the neighborhood a lot of times already. People are calling him Mumen Rider."

Unlicenced rider? What a very lame name. But a hero wannabe, huh? Sonic's grin was wider this time. He suggested to the group, "Why don't I give him a warm welcome then?"

Boros shrugged his shoulders as he buttoned his shirt. "Suit yourself."

In truth, the four of them weren't exactly a group. They definitely weren't friends. More like coke and sex buddies. Those two things were the only reasons why they hung out with each other. They had decided not to care about each other's business except when it was about drugs or pleasure.

"So, where the fuck does he live?" Sonic asked Genus.

The bespectacled boy answered with a frown. "That's the problem. No one knows his true identity. He always has this helmet and motorcycle goggles on and arrives randomly then just disappears."

What? Genus, the one with all the answers, did not know who this boy was? Hmm. That piqued Sonic's interest even more. "Fine," he said. "Just inform me the moment he's sighted and I'll come running."

"Okay."

With the knowledge of Mr. Goody-two-shoes, Sonic felt excitement course through him. Would this boy prove to be a worthy opponent? He wanted to meet him soon and test his skills. Sonic was pretty confident in his abilities. His adoptive family was a dojo owner and had trained him mercilessly since he was a kid. He could easily win against anyone; he was sure. Fuck, when could he beat the shit out of this guy?

Sonic was impatient.

Because besides being a sex and drug addict, he was also a fighting maniac.

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There was no such thing as a perfect city. Satoru knew that this city, too, had its good and bad points. For example, he liked its beautiful park and its clear river that ran along different districts. The people were friendly, and the institutions were very accommodating. Overall, it was a nice place. But, its bad point was that it was crime-ridden. Rumor has it that the place was being held hostage by influential people from the underground.

Thieves ran freely on its grounds. Violence was everywhere. Delinquents hide under the veil of the yakuza, and drug dealings were scattered all around.

Satoru fancied himself a defender of justice, but he was no fool. Armed only with courage (and with almost zero fighting skills), he began patrolling the Sakamichi district first and helped those he could help. To hide his true identity, he covered his short brown hair with a helmet and his dark brown eyes with thick motorcycle goggles. The people in the neighborhood started calling him Mumen Rider.

The thought of his nickname made Satoru smile. He was an unlicensed rider because he could not ride a motorcycle and chose to use a bicycle instead.

Now, he was riding his bike toward the darkest corner of Sakamichi district. He had reported once about an illegal transaction he witnessed there. The police were quick to act and arrested a drug dealer selling cocaine to a minor. Really, why were these people so bent on ruining the lives of others for money? Money could be earned but a life ruined would be hard to restore.

The night was young. Only eight in the evening. Satoru approached the notorious alley and stopped as he spied a boy sitting on a metal railing. A lighted cigarette rested between his lips, its smoke forming dancing lines in the air.

The boy sensed his presence and looked at him. He was beautiful, with long black hair tied into a knot and a feminine face. Wait, was he actually a girl? The mysterious person walked toward Satoru with a wild grin and, with an amazing agility, suddenly hit Satoru in the face.

The punch was strong enough to send Satoru flying. His motorcycle goggles snapped and dropped on the floor. His lips bled. What in the world was the stranger doing? Was the person tasked by the yakuza to take care of Satoru because he was being annoying? He knew this day would come sooner or later so he was prepared. He took his phone from his pocket and was about to hit a button but the stranger kicked his hand and grabbed his hair.

Damn.

Was this the end of him? Would he be killed by a minion of a criminal organization? There were still things he wanted to do. So many he wanted to achieve.

The stranger looked at his face. Oh no, Satoru's face was revealed. People would know his real identity. Should he attack? Fight back? Maybe he should wait for the right timing. When the stranger attacks, he would dodge and then punch. That'll do.

So he waited.

But the stranger did not move. Just looked at him with his bright gray eyes like time was frozen. "You..." the stranger said in a deep boy's voice. "Shit," he cursed and then let Satoru go.

Actually let Satoru go.

Confused, Satoru watched the beautiful boy turn red and walk away while swearing, "We'll fucking meet again!"

What in goodness' name was that?

Satoru gaped as the mysterious stranger disappeared. Was that it? Their encounter had ended?

The boy just... left.

What was he thinking?

Satoru shook his head. He shouldn't linger here any longer. The mysterious stranger seemed to not pose a threat anyway. Maybe he regretted punching Satoru and then ran away embarrassed. That must be it.

Satoru fixed his motorcycle goggles and rode his bicycle, finally leaving the dark alley and the weird encounter. There were many places he needed to patrol.