NOTE: This fanfiction will not follow any episode on the show. Instead, this would be my take between those two best buds.

An Unforgivable Mistake

Chapter I

"Hold on tight dude! Don't give up just like that!"

His eyelids were heavy as hell. It feels like he was inside a cave, blurring everyone talking in sight.

A week before

The room was dark if it wasn't for Mordecai's phone. Its bright screen is enough to wake someone up. The phone then let out an obnoxious sound that would trigger Mordecai. He then shot up in a sitting position, as he tried to reach his phone on his side drawer. As he liked to sleep longer, his sleepiness seems to have bailed him.

Standing up, he walked to the window to peek at the blinds.

"Aggh, it's bright as hell" Mordecai said as the sunlight glared on his face. He blocked it using his free wing.

"Aight Rigby, wake up"

Getting no response from his call, he walked towards Rigby's messy trampoline. He slapped the unwashed clothes Rigby doesn't even wear one by one. As the clothes dwindled, he noticed Rigby wasn't on his "bed". He didn't bother to return the clothes he littered.

He then went out the room to head downstairs. He thought that Rigby must've woke up early as he hated doing jobs overlapping their free time.

Looking everywhere inside the house, there was no sighting of the raccoon, well except for the cardboard cutout shaped like Rigby produced by himself with old materials they found.

"Hmm, where is he?, I totally remember sleeping with him last night"

Mordecai then decided to expand the list on where to look at by looking around the park. No signs of Rigby anywhere. He decided to ask his co-workers.

"I haven't noticed him anywhere" Skips said.

"Haven't seen him today bro" Muscleman said.

"I only woke up five minutes ago" Hi-Five Ghost said.

"I apologize, but I must've missed Rigby leaving today" Pops said.

"Why would you ask me for him? I haven't seen him anywhere!" Benson exclaimed.

Mordecai then thought of a better way of finding him. He took a mini break.

He watched the television for some morning news. He was in the right timing as Margaret was just about to deliver the top headline.

"A police car and a black sedan were involved in a car crash with two fatalities, an investigation is still taking place" Margaret said in her report.

"That's awesome, but Rigby should've seen this" he said.

Remembering Rigby, he tried to backtrack on their last night's crazy antics. They were drinking sodas all night, singing bad pop music, playing video games until they passed out. He then recalled Rigby saying something dark and hilarious.

"Dude, y'know I really wanted to leave this shitty park"

"Why do you wanna leave? We just got a raise! We now earn the same cash Skips earns weekly"

"I want to be cooler and stuff! Like some professional hitman or some shit"

"That's impossible for you dude"

"Shut up!"

Well that didn't help. Of course everything Rigby said doesn't make sense sometimes. He wanted to look for him but he doesn't know where to start. He gave himself some time to think. He didn't care about the jobs since they are now respected equally after Rigby shot on their boss. They are now given their freewill of working whenever they wanted to as long they would finish the job.

He went to the Coffee Shop. Of all the places he can look for him, this might be the best spot. He went inside and scanned the entire coffee shop with his eyes. He found someone who's exactly familiar, Rigby.

"Rigby!" he said as he sprinted to where he spotted him. Similar to those movie clichés when looking for someone, he was just similar in color.

"Where the heck is Rigby!" he exclaimed as he raised his wing in frustration.

He needed to clear his mind, he sat down and called Eileen for his order.

"Eileen? The usual please"

"Coming!"

Where would he go? Another question that bugs his mind is why would he care that much since Rigby can go home by himself.

His food finally came. As she handed the tray, she noticed Rigby wasn't in his company. She asked where he is.

"Yeah I'm looking for him, I haven't seen him this morning"

"Maybe he just picked up some things?"

"Nah, he usually tags me along. He can't do stuff on his own sometimes"

"Poor guy, I'm gonna help looking for him after my shift"

"Thanks Eileen"

Eileen then went back to the kitchen. Mordecai felt relieved as there's someone that can help him look for Rigby. He then quickly finished his meal then left the Coffee Shop. His blank thoughts raced on his mind. He stopped looking for him momentarily as he decided to finish their work first.

As he stepped inside their house, he saw all of the park workers having a meeting.

"Mordecai! Have you seen Rigby yet?" Benson asked him.

"Uh, no. I looked for him earlier" he replied as they started to mutter unintelligible noise.

"Alright, let's all calm down. Mordecai, go find him where you usually go with Rigby, the rest of you try looking somewhere else he can possibly be. I'll go file a missing report for him, if it's fine to have it on an early notice" Benson commands them as they moved with their new tasks.

Mordecai was clueless on the possible whereabouts of his best friend. He only had few options on where to find him. He looked at the arcade, the video game shop, Wing Kingdom, the list goes on.

"WHERE IS HEE!" he screamed to the skies.

He messaged Eileen, as he thought she might've found him. She and Rigby hangs out a lot more than usual, which is unusual for him since Rigby heavily despised her. A reply came in a matter of seconds.

"didn't see him yet. I'll try looking at the pier"

"Fuck" he muttered. He was thinking on where on Earth would he be. He was looking for Rigby the whole day.

The sun then sank down in the clouds, signifying the arrival of the moon to shine through the night. He decided to stop looking for him as he's feeling tired from walking around the city.

On his way back to the park, he saw badly written missing signs for Rigby. He thought that his co-workers ran out of luck looking for him. Eileen updates him on the places she checked.

Heading back to their house, he went upstairs to take a rest. As he threw himself to his bed. He noticed something that isn't right. Their room is spotless. No clothes that he remembered throwing it everywhere were on the floor. He thought that Pops might've cleaned their room but it can't be because Pops doesn't even go inside their room as Pops respects their private space.

"Did Rigby got back here without us knowing it?" he asked himself.

As he tried to investigate if his speculations were true, he found Rigby's phone left charging on the wall socket. He quickly noticed his battery percentage. It was at 12%. He then thought that Rigby just arrived. Mordecai then stood up and checked everywhere inside the house if he was inside the house.

"Rigby! RIGBY!" Mordecai hollered his name, hoping that he would respond to him.

Getting no answer, he lightly snapped. He kicked the fridge on a weak manner as he knows the fridge wasn't cheap.

"Why isn't he showing up! Did he do something horrible last night?" He muttered to himself.

Thinking ahead of the situation, he ran outside as he thought Rigby is still heading out if he will be leaving the park again. He went to the arch of the park if there would still be a sign of his friend. Seeing no raccoon by the arch, he sprinted around the park if he can see him. It's impossible for Rigby to be gone for too long without acknowledging everyone especially him, since they are inseparable for life.

He might as well just give up now, but he's his best friend. This means giving up won't be an option.

That concludes the first chapter of my new story! Now there are lots of things I have to focus into. The seventh chapter of my other story and this. Also I would still upload the Yandere oneshots (maybe in a week) so I'm hoping that it would still be a relevant idea lol. Also apologies for my short chapters. It's because I'd prefer to write shorter stories...for some reason. Anyways byeee lol.