Muscle Man and Starla are sitting on a park bench. Muscle Man chews a piece of gum and spits it out on a wrapper before placing it on the ground. A speed walker is then coming up. "Oh, it's on." He pulls out a popcorn bag. "Time to bust out the popcorn, baby." He starts eating some of it. The speed walker steps onto the gum-covered wrapper as Muscle Man laughs at what he just did. "Why aren't you laughing, babe? You always laugh when we go on dates!" Muscle Man said.
"Mitch, we have to talk." MM&S get up from the bench as Muscle Man wonders what Starla is about to say. "I've been thinking. We need to take our relationship to the next level. My parents are in town tonight, and I think you should meet them over dinner!" MM&S grab each other's hands. "Whoa, seriously? Babe, that's a huge step!" Muscle Man dips her. "And I already know the perfect place: Wing Kingdom." He said. "Uh, I don't think you should take my parents to Wing Kingdom." Muscle Man frowns as Starla gives her opinion. "I have another place in mind." She said.
They go to a fancy-looking restaurant. First, they see a chandelier. Then, a man sitting at a table with a cup of tea. He raises his pinky finger and takes a sip. Next, a woman with a napkin. She raises her pinky fingers from off the napkin and then wipes her upper lip. They are then shown a sign that reads: No Shirt, No Shoes, No Service. Muscle Man looks through the window, dismayed. "Oh no, bro." He said. "Uh, are you sure about this place?" Muscle Man asked nervously.
"Yeah! This is the best place to make an impression. I really want my parents to like you." Starla said. "Sure. Then, let's go here, babe." Starla kisses Muscle Man. "I'm so excited for my parents to meet you!" She gasps. "I have so much to do!" She runs off. Later at Pops' house, Muscle Man is making a reservation as (Y/n), Mordecai and Rigby walk in. "I'd like to make a reservation." The trio notice what's going on. "Yeah. Sorrenstein, party of four, seven o'clock p.m." Muscle Man said.
"Oui, <Yes,> Mr. Sorrenstein, we will see you tonight at seven. Now, we do have a strict dress code." Maitre'd said. Muscle Man begins sweating profusely. "Dress code?" He asked. "Oui. <Yes.> Black tie, jacket..." Maitre'd said. The trio continue watching. "Jacket? I think I might have a windbreaker." Muscle Man said. "What?! Did I mention a shirt and shoes are required as well?!" Maitre'd asked. "Uh... Of course not; I know that! Now, this is totally a joke question, but that shirt has to be clean too, right?" Muscle Man asked.
"What?! Well, I never!" Maitre'd is yelling over the phone. "See you at seven!" Muscle Man quickly hangs up the phone, panting. "Lemme guess, Bistro en Le Parc?" (Y/n) asked. "Yeah. I have to meet Starla's parents there tonight." Muscle Man said. "Whoa, takin' it to the next level!" The trio said.
"Yeah, but didn't you hear that? I barely made it through the reservation! How am I gonna impress Starla's parents if I can't even make a reservation?" Muscle Man asked. "Dude, just be yourself." Mordecai said. "I can't be myself! Myself sucks! Starla will totally dump me if her parents don't like me." Muscle Man said. "We'll help you get fancy for your dinner." Rigby said. "Really, dudes?" Muscle Man asked. "Yeah, man. We're your friends. We hate to see you bummed out." (Y/n) said. "Plus, last time Starla dumped you, you got all sad and we had to do your work." Rigby said.
"Not to mention she totally destroyed the place. That took AGES to fix." (Y/n) said. "Ugh, don't remind me." Rigby said. "Yeah. Sure glad I'm not you guys. Where do we start?" Muscle Man said. "Not we." Mordecai said. They are now in Pops' room. "He." Mordecai said. Pops laughs. "I'm so happy that you decided to become fancy, Muscle Man. And, you want me to help! I even wrote a book about it!"
Pops puts a book on the table, titled:) Fanciness, Theory and Practical Application. He opens the book. "A practical application of advanced theory of fanciness." He said. The quartet back out. "Volume one of six. First printing, published, M-C-M-X, V-I-I..." Pops continued. (Y/n) closes the door. "Guys, we're gonna have to do this our way." (Y/n) said. "Good. 'Cause I don't know if I can handle having to listen to Pops speak Spanish anymore." Muscle Man said.

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Regular Show X Reader
FanfictionThree best friends, a blue jay named Mordecai, a brown raccoon named Rigby, and a chipmunk named (Y/n) work as groundskeepers at a park, spending their days trying to entertain themselves (occasionally by perfecting useless skills during work hours...