at West Anderson High School, (Y/n), Mordecai and Rigby are driving up to the front in the cart. Rigby looks at his program list. "Alright, let's see now. Foreign language, check. Geology, check. All that's left is... bam!" Rigby said. Rigby shows the list and circles the final class. "Gym class! Once I pass this, I'll finally be able to graduate. Besides, any bozo can pass gym." Rigby said. "Then why didn't you pass the first time?" (Y/n) asked with a smirk, and Mordecai snickers. "I dunno. High school was a long time ago." Rigby said. "Alright, you little loafers. Listen up!
Coach McCrackle will no longer be teaching here." Principal Dean said. The gym class mumbles amongst themselves. "He requested that I read this letter of resignation to you all." He clears his throat. "Dear class, things are finally looking up for me. I have won the lottery. Now that I'm a rich man, I will never have to spend another second in that disgusting gym with your pimply, greasy faces ever again." It, uh, goes on like this for a while. But anyway, we found a new substitute for the remainder of the school year." He said. "A substitute? This'll be easier than I thought. Hello, high school degree." Rigby said. "So please welcome former student and 5-time volleyball champion, coach Francis Jablonski!" The door opens, and Jablonski walks into the gym in slow motion. He looks to the class and forms a smile. Rigby gasps.
~Flashback~
Teenage Rigby is standing in the hallways carrying books as he sees Jablonski running towards him with a volleyball. "Body check!" He shouted. "Jablonski, no-" Jablonski shoulder bumps into Rigby, causing him to groan and drop a few books. Later at the gym, Jablonski is practicing volleyball with 3 others. "Set me up!" He serves the ball. Rigby is walking by. The ball hits him in the face. "Aargh! Jablonski!" Later in the school field, Teenage Mordecai and Rigby are standing by as Jablonski is doing donuts, covering them in mud. "JABLONSKI!" Jablonski laughs as he continues spinning donuts.
~back to the present~
"Jablonski..." Rigby whispers. "Well, Jablonski, I'll leave ya to it." Principal Dean said. "Listen up, you clowns." The gym class is shocked. "Now that I'm running this show, things are going to be different around here." He blows his whistle. "Everyone, 20 laps! Let's go! Except for my little bro Aiden, who's already achieved peak physical fitness." The class gets off the bleachers and onto the court. Jablonski scoffs. "Look at this. I didn't know this school had a 10-year program." He said.
"Look, Jablonski. High school was a long time ago. We both matured a lot since then. Let's bury the hatchet." Rigby said. "Huh! As if! You wanna fail my class like you failed at life?" He asked. "No, sir." Rigby relied fearfully. "WELL THEN GET MOVING!" Rigby, Milton and the class run to the middle of the court, where they start doing jumping jacks. " ...58, 59, 60..." Jablonski said. Francis and his brother are on the bleachers, eating pizza. "Let's go! More jumps, less jacks!" Rigby is struggling to climb a rope in the gym.
He reaches the top and falls off. Francis blows his whistle. "Get back on the rope, you Butterfingers! This ain't naptime!" The gym class is running across the field with the Jablonski brothers driving behind them. "Come on! Let's hustle! Only 3 miles left!" The gym class is washing the Jablonksis' car. "That's right! Put your backs into it! I want the Jablonski mobile spotless before lunchtime." Jablonski said. "What does this have to do with gym class?" Rigby asked. "EVERYTHING! Now get scrubbing!" Rigby growls. Later Rigby is at the door to Principal Dean's office. "Let me get this straight. You want me to fire Jablonski?" Principal Dean asked. "Yes, Principal Dean." Rigby said. Principal Dean sighs. "I can't fire him, but I can talk to him on your behalf about the car thing." He said. "What?! No! Don't mention me! He'll only make things worse if he knows I told you." Rigby said. "It'll be totally anonymous, don't worry about it. Your secret is safe with me." Principal Dean said.
At school, the principal is on the gym court behind Jablonski. "Alright now, before we begin, I have an announcement to make. Principal Dean just told me that someone here has a problem with my teaching." Jablonski said. "Totally anonymous." Principal Dean said, and Rigby gulps. "Well guess what? That someone just earned you all extra laps!" The class grumbles. "Aw, man! I can't believe someone snitched!" Rigby said. Jablonski blows his whistle, and everyone walks down to the court. "Let's go! Get to it!" Rigby whistles innocently as he goes down.

YOU ARE READING
Regular Show X Reader
Fanfiction(This is part 2 for my Regular Show X reader series, this book will contain the rest of the show, I hope you enjoy it!) Three best friends, a blue jay named Mordecai, a brown raccoon named Rigby, and a chipmunk named (Y/n) work as groundskeepers at...