A/N: This isn't in order, YET! It will be in January-

Let me set this strict reminder. The Kids in this series are aged up to 16+. Candance is in her 3rd year of college, which she attends on the computer for this series. Everything happens in place, except their teens now. This is so it's not as weird and fits with the guidelines.

(Y/N) spends time with Candance to learn about "Babysitting". Mostly because Candance is forced to "babysitter" her two sixteen year old little brothers. Hence, here we are.

Ferb is the quiet [literally only a sentence per episode] and in love type while (Y/N) is the optimistic, communicative one who is oblivious to Ferb's advances.

Season One - They're 16

Season Three - They're 17

Season FIVE [Whenever that comes out] - They're 18

[Also I think the Wiki Fandom Transcripts & IMDB are kinda mixed up...this is the episode order for me via Transcripts. Sorry if they're really mixed up-]

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Scene opens up with the camera zooming into the backyard. Phineas and Ferb are sitting under a tree feeling bored.

"So, Ferb, what do you wanna do today?" Phineas asks, curiously.

Ferb shrugs in reply.

"What about Perry? What does he want to do?" Phineas turns to their pet platypus, Perry.

Perry chatters.

Phineas sighs, "Well, he's a platypus. They don't do much." He pauses, "I, for one, am starting to get bored, and boredom is something up with which I will not put!" He stands up, "The first thing they're gonna ask us when we get back to school is 'what did we do over summer?'. I mean no school for three months!" He crosses his arms, "Our life should be a rollercoaster! And I mean a good rollercoaster, not like that one we rode at the state fair..."

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Flashback on a rollercoaster at the state fair. It goes over one tiny hill then ends.

"Please exit to the left." The Fair Worker states as Phineas' eye twitches from complete boredom as Ferb shrugged and crossed his arms.

End flashback.

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Phineas huffs, "Man, that was lame. Why, if I built a rollercoaster, I would–" Phineas quickly gets an idea, "That's it! I know what we're gonna do today!"

Linda, their mother, peaks her head out of the sliding glass door, "Phineas, Ferb. I'm gonna go pick up a few things. You boys stay out of trouble, okay?"

"Okay, mom." Linda leaves as Phineas turns to look at Ferb, "We're gonna build a rollercoaster!"

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Linda gets into the car; Candace comes over.

"I'm in charge, right? You did tell them I'm in charge?" Candace smiles.

Linda looks at her college attending daughter, "Relax, Candace. Nobody has to be in charge."

"But what if there's an emergency?" Candace questions.

"Like what?" Linda fires back.

"What if a..." Candace gasps, "What if a satellite falls out of orbit and crashes into the house?" She smiles.

"If that happens, you're in charge...and don't forget your training that sweet (Y/N) girl from down the street." Linda reminds Candace.

"Yeah, Yeah, I remember." Candace smirks as Linda pulls out of the driveway, "Yes!" Candace enters into the backyard, "Mom says I'm in charge, conditionally."

Phineas and Ferb are working on something with drafting tables.

Phineas was not listening, "Whatever."

"Wait a minute, what are you doing?" Candace asks.

"Homework." Phineas replies.

Candace pauses, "It's summer."

"That's cool. You wait till the last minute then." Phineas forces a smile.

"Well, I'm watching you." Candace goes through the door, "And I'm in charge, conditionally!" The doorbell rings as Candace walks to the door and opens it.

"Hello Candace!" (Y/N) smiles kindly.

"Oh, (Y/N). Right...you're here for...what again?" Candace asks.

"To learn how to babysit?" (Y/N) questions back.

"Right!" Candace snaps, "Come in. Come in. We have much to learn..." She smiles.

"Cool!" (Y/N) walks in as she spots the two in the backyard, "Mind if I say hello to your brothers?"

"Sure, Sure." Candace sits down in the chair facing away from the living room.

(Y/N) opens the sliding glass door, "Hello!" She smiled sweetly as she noticed what they were doing, "What's...going on here?"

Phineas turns his head, "Hey (Y/N)!!" He smiled happily, "We're building a Rollercoaster."

"Cool! Can I get a free ticket?" (Y/N) jokes.

"For a friend, of course!" Phineas jokes back.

Ferb was staring at (Y/N) from his post, as his cheeks tinted pink. He quickly waved at (Y/N) before stumbling a bit.

"Hello to you too, Ferb!" (Y/N) giggles, causing Ferb's cheeks to tint a hint more pink, "Well, have fun! Tell me when it's ready!" (Y/N) went back inside.

Candace walks into the house and the phone rings, which she answers. As (Y/N) just watches the two boys building from inside.

"Hello? Oh, hi, Stacy! No, I can't go to the mall right now. Mom just went to the store, she left me in charge, well, you know, conditionally...plus I'm training that girl from down the street...yeah, (Y/N)." Candance yaks on, Phineas and Ferb walk past with lots of wooden planks as Ferb looks towards (Y/N) for a second before snapping forward, "Oh if you go, can you see if Jeremy is there? No, no, he's the cute one that works at Mr. Slushy Burger." Phineas and Ferb walk past with steel beams as (Y/N) watches them back and forth, "Yeah, he totally smiled at me last time I was there. I just about died. No, I told you I can't. I'm watching my brother and stepbrother...and training (Y/N)." Phineas and Ferb walk past with sinks and toilets, which makes (Y/N) tilt her head to the side, "Yeah, and they never get into trouble 'cause Mom never catches them. One of these days though, I'm going to see to it that she catches them red handed." Phineas and Ferb walk past with a flamingo and a lion in a cage that roars loudly, Candace stops and turns around to see nothing, "Will you hold it down?! I am trying to use the phone!" Candace gets back on the phone with Stacy, "Mom left me in charge, so there will be no shenanigans today. What are they doing right now? Why do you ask? What do you mean you can see it from your house? See what?!" Candace runs out to the backyard and stares in shock upon seeing the rollercoaster as (Y/N) follows from behind, yet stares in awe.

"Phineas, what is this?!" Candace yells.

"Do you two like it?" Phineas asks.

Candace gets angry, "Ooh, I'm gonna go tell mom and when she sees what you are doing, you are going down!" Candace turns to (Y/N), "Watch them!" (Y/N) salutes as Candace runs off, "Down, down, down! D-O-W-N, down!"

"It looks incredible!" (Y/N) smiles with excitement now that Candace is gone.

Phineas and Ferb look blankly while she walks away.

"We're gonna need a blowtorch and some more peanut butter." Phineas smiled, "(Y/N), you don't mind watching, right?"

"Nope! Just allow me to enjoy the show!" (Y/N) joked, sitting down and watching as Ferb seemed nervous.

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Candace got her bicycle and rode away.

Isabella walks up to the house, "Hey, Candace, is Phineas... home?"

"Down, down, I say!" Candace mutters as Isabella shrugs.

Isabella walks into the backyard.

Isabella has hearts in her eyes, "Hey, Phineas."

"Hey, Isabella." Phineas replies without even turning to the poor girl.

"What'cha doin'?" Isabella asks with a smile on her face.

"Building a roller coaster." Phineas states.

"In your backyard?" Isabella questions.

Phineas shrugs, "Some of it."

"Wow. Isn't that kind of impossible?"

Phineas pauses, "Some might say."

"Hi (Y/N)!!!" Isabella smiles happily.

"Hi Isa!" (Y/N) waves back with a kind smile.

Isabella nods to Ferb, "Hey, Ferb."

Ferb turns to Isabella as he waves with the hammer.

"Does your stepbrother ever talk?" Isabella asks.

"Ferb? He's more of a man of action." Phineas answers.

Ferb hits the nail with his hammer and then his nose as he hears (Y/N) giggling, which causes him internal joy.

"I was gonna go to the pool, you wanna go swimming?" Isabella asks.

Phineas pauses, "Kind of in the middle of something here."

"Oh, right. Okay, I'll see you later then." Isabella leaves.

"Bye Isa!" (Y/N) waves to Isabella, continuing to watch the two.

"Okay." Phineas looks up at Ferb, "Hey, Ferb! You got enough rivets up there?"

Ferb gives a thumbs up showing they have rivets.

Phineas looks around, "Hey, where's Perry?"

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Perry walks around the corner of the house. He jumps up, puts on a fedora and walks into a hole in the wall. He goes down a lift into a lair, where he gets an incoming message.

"Good morning, Agent P." Major greets, "The evil Dr. Doofenshmirtz is up to his old tricks. For reasons unknown to us, he bought up 80% of the country's tinfoil. I want you to get over to his hideout right away. Find out what he's up to and put a stop to it. As always Agent P, it is imperative that your cover identity as a mindless domestic pet remains intact. Now, get out there. We're all counting on you."

Agent P jumps into a platypus-themed hovercraft, and flies through a tunnel. He leaves through a stone and holds his fedora down to hide from Phineas and Ferb.

"So, the way I see it, the solid fuel rockets kick in at the mall's parking lot, then we release the snakes during the corkscrew around the interstate. I'm gonna go get the snakes." Phineas instructs as he leaves to go retrieve the snakes.

Ferb puts on his mask and starts using the blowtorch. As (Y/N) still watches from below.

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Candace runs into the store to see Linda, "Mom! You gotta come home, right now."

"Did a satellite crash into the house?" Linda asks.

"No, no, no. You gotta see what Phineas and Ferb are doing." Candace exclaims.

Linda sighs, "Seems like we've had this conversation before."

Candace pauses, confused, "What do you mean?"

"I seem to recall you telling me that the boys were training monkeys to juggle bicycles, and when I come home, there was a stunning lack of monkeys." Linda states as she continues to put things in her cart.

"I still don't know how they cleaned that up so fast." Candace exclaims as she rubs the back of her neck.

"...You are in college, Candace..." Linda stops and turns to Candace, "So, what's the emergency this time?"

"They're building a roller coaster!" Candace shouts.

Linda blinks and rubs the bridge of her nose, "Candace, seriously, isn't Phineas a little young, for a teen, to be a roller coaster engineer?"

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Phineas talks to a man in a car factory.

"Aren't you a little young, for a teen, to be a roller coaster engineer?" The man questioned.

Phineas paused, being sixteen, "Yes. Yes, I am."

"Well, I must say, I'm very impressed." Phineas smirks, "...the forms all seem to be in order, although I've never seen them filled out in crayon before. So, if there's anything I can get you, anything at all, just let me know."

Phineas turned his head, "Do you think we could borrow one of those gadgets?" A robot arm fixing a car is shown.

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Phineas and Ferb are riding the roller coaster that is built by the robot arm. Phineas sits in the front as Ferb was forced to sit next to (Y/N), who was smiling at the sights.

[Yes. Phineas isn't oblivious to his BROTHER'S crush but is oblivious to Isabella's crush on him. Same with (Y/N), she knows Isabella likes Phineas yet is oblivious to Ferb's crush.]

"This is amazing!" (Y/N) smiled with excitement as Ferb looked at her from time to time.

Phineas agrees and sighs, "Now, this is the life."

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The camera zooms in on Doofenshmirtz Evil Incorporated.

🎵 DOOFENSHMIRTZ EVIL INCORPORATED!!! 🎵

Agent P swings into the building as action music.

Doofenshmirtz turns to Perry, "Ah, Perry the Platypus, what an unexpected surprise. And by unexpected, I mean COMPLETELY EXPECTED!" Doofenshmirtz presses a button, which activates arms that grab Agent P, "I, Dr. Heinz Doofenshmirtz, have covered the entire eastern seaboard in tinfoil, and when I put my giant magnet, next to my ingenius, Magnetism Magnifier, I will pull the East, in westerly direction, thereby reversing the rotation of the Earth." His smile grows, "You may well ask yourself, why would he do this? What could he possibly have to gain?" He tilts his head to the side, "Well, let me just answer that by saying I haven't really worked out all the bugs yet. I mean, you know, tinfoil alone cost a lot."

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Back at the store.

"But, Mom, I'm telling you, they're building it, and it's huge!" Candace exclaims as Ferb puts up a poster, Candace comes over to read it, "...'Phineas and Ferb present the Coolest Coaster Ever now open'?" Her eyes widened, "Mom!" She runs off.

Pedro, a random kid, comes up to the poster, "Phineas and Ferb got a roller coaster?" He smirks, "You think we get a discount if we bring the flier?"

Dimitri, another random kid, follows his fellow teen, "Maybe we better take it."

They take it with them just as Candace brings Linda over as she gestures toward the empty post, head turned away, "There, look, look, look, see? I told you I'm not crazy, I told you!"

Linda stares at the wall and says dryly, "And you're not crazy because...?" Candace turns toward the post where the poster was and screams, "I see your point, Candace. No crazy person would scream at a post like that." She pats her daughter's arm, "I'll be in the dairy section if you wanna come yell at some cheese, or anything." She mutters, "She's in college...college." She leaves.

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At the Flynn-Fletcher house, where the start of the coaster and a stage is. Ferb and (Y/N) lets the kids into a tent and Ferb walks onto a stage up to the microphone as if he's about to speak, then steps out of the way as Phineas comes up. He grabs the microphone as disco lights shine and rock music plays.

"Ladies and gentlemen, boys and girls, children of all ages! May I present to you a spectacle most of the morning in the making: The Coolest...Coaster...EVER!!!" Ferb pulls a rope to reveal the coaster as the camera pans up to its top and a bird files into it and falls, "So, who wants to go first?"

The bird lands right behind Phineas. Everyone raises their hands.

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The kids are now on the rollercoaster. Phineas provides safety instructions while holding a safety belt.

"To fasten, insert the tab into the metal buckle. To release, just pull back on the—" Phineas drops the belt, "Oops. Well, you get the picture. Well, that's about it. Enjoy the ride." The car goes over the top, and stops, viewing the long drop, "You all signed the waivers, right?"

The car quickly drops as everyone screams. It goes through loops, hairpin turns, and a corkscrew, then a load of rubber snakes drop on it.

"Relax, they're just rubber!" Phineas smirks.

The car goes into a bucket of mud, then exits and gets cleaned through a car wash.

"Hey, look, here comes the AH-AH-AH-AH!" Phineas laughs as Ferb, who was forced to sit next to (Y/N), was stiff and facing forward as (Y/N) was screaming and laughing.

The track goes through tracks resembling four "AH"s, causing the car to go up and down repeatedly. The car zooms around the Doofenshmirtz Evil Incorporated building.

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Back at Doofenshmirtz Evil Incorporated.

"...When I really make all my money back, I-I-I could buy a bunch of east-facing real estate, and sell it again with a–" Agent P sends a screw at Doofenshmirtz, which he ducks for, "Ha! You missed!" The screw flies to the roof and hits a line, which throws it back at Doofenshmirtz's foot, "Aaaoow!! Ow, Ow, Ow, Aaooww!"

Doofenshmirtz jumps around and accidentally releases Agent P, who quickly punches him. The two fight each other with wrenches, then Agent P hits Doofenshmitz's foot.

"Aaaoow!!" Doofenshmirtz rolls a battery cart into Perry, who jumps over it, causing the cart to fall outside through a window as Doofenshmirtz then pulls a lever, "Now you are too late!" The top of the building opens, then the Magnetism Magnifier activates, "Quake in your boots and watch helplessly, as the unimaginable electromagnetic forces pull the eastern seaboard, thereby reversing rotation of the–" All the tinfoil releases from the buildings as he stares in slight shock, "Well, that didn't work." The tinfoil forms into a giant ball, flying through the air, "And now, we have a two-ton ball of tinfoil traveling 200 miles an hour directly at us! Quickly!" Perry and Doof share a nervous look, "We must separate the magnet from the Magnifier before it's too late!" Doofenshmirtz and Perry run to the Magnifier and attempt to separate the magnet from it.

[I love how they force Perry & Doof to work together in the first episode because Doof goofed up! XD]

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At the store.

"Now I know I have that club card in here somewhere." Linda looks around her purse, "I always have it with me, but my purse is such a disaster area, you know how it is."

Candace goes outside and sees the coaster, "Oh, oh, oh, oh, oh! Mom! Mom!" She rushes off back inside.

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Doofenshmirtz Evil Incorporated building.

"It's no use! It's no use! We are doomed!" Doofenshmirtz cries.

Agent P sees a helicopter. He jumps onto the magnet and fires a grappling hook at it. He quickly wraps some of the rope around the magnet. The helicopter flies off, taking the magnet with it.

"You did it! You saved us, Perry the Platypu–" The tinfoil crashes through the building, "Curse you, Perry the Platypus!"

The magnet pulls a piece of the Magnetism Magnifier onto it, and gets stuck on the coaster, which begins to rumble as it follows the helicopter.

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Candace pulls Linda into the parking lot, "Look, look, look, see?" The coaster gets lifted by the helicopter just before Linda looks.

Linda pauses, "Okay, I give up. What am I supposed to be looking at?"

Candace turns to see the empty parking lot, "No!! It's not POSSIBLE!!!"

Linda starts going back inside, "I'm gonna go get the cart."

"IT WAS RIGHT HERE AND IT WAS HUGE!!!" Candace then sees the rollercoaster fly away, "MOM!"

Linda walks past, taking her cart, "Time to go. I've got frozens."

Candace pauses, an idea in mind, "Okay, so you think that Phineas and Ferb are still under that stupid tree in the backyard, right?"

Linda turns to her daught, "With (Y/N) there as well...since I'm guessing you left her there..." She rubs her head, "Then, yes. That would be my guess."

"Fine, then let's go home now!" Candace pushes the cart.

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Agent P sees that the helicopter is smoking and cuts the rope. He drops down onto the coaster and in the cart, right behind Phineas and Ferb.

Phineas smiles, "Oh, there you are, Perry." Perry, now in pet mode, chatters as Phineas turns as he is seated right next to Isabella, "Nice hat, Isabella." Isabella takes off Agent P's fedora and looks at it, confused.

The car goes to the end of the track and flies onto a construction area, then a crane flings in into the air.

"Funny, I don't remember this in the blueprints." An airplane picks up the car by the tail, "And I'm sure this is new."

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Candace sees the airplane from Linda's car and giggles maniacally, "I worry about you sometimes, Candace..." Linda reminds herself how Candace is in college and questions it.

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The coaster car drops down and onto the Statue of Liberty, which bends and throws it to Mount Rushmore, where it makes loops inside Theodore Roosevelt's glasses then flies again. It lands on a pine tree that bends so they end up in front of a Mr Slushy Burger stand.

"Welcome to Mr. Slushy Burger. May I take your order?" Jermey questions.

"Anyone want fries?" Phineas asks.

Before taking any orders, the tree bends back and throws them to Paris, where they land on the Eiffel Tower, which bends so they end up in front of a croissant stand.

A French Man asks, "Croissant?"

"Anyone want a..." Phineas speaks in a french accent, "...'croissant'?"

Before taking any orders, the Eiffel Tower bends back and flings the car into space. A satellite flies by.

"You know, if that thing crashes to Earth, Candace is in charge." Phineas turned back to his brother, who nods, "We hold nothing against you, (Y/N)..."

"Aww thanks!" (Y/N) smiles.

"It was Ferb's idea." Phineas turns back as (Y/N) nudges Ferb and smiles as Ferb seems too nervous to smile back.

The car suddenly falls down to Earth towards the Tri-State area. The front of the car begins to burn like a meteor.

"We should have charged more." Phineas crossed his arms in thought.

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Linda pulls the car on the driveway and Candace jumps out, "Okay, we're here. Are you happy now, Candace?"

Candace, giggling maniacally, opens the gate to the backyard and doesn't see Phineas or Ferb.

Candace celebrates, "Yes!" She turns to look at Linda, "See, Mom? I told you they weren't there!"

Candace gestures toward the tree with her eyes closed while leaves rustle. Linda pokes her head through the gate opening and smiles.

Linda looks past the gate, "Oh, hi, boys. Hello (Y/N)." She waves.

Candace opens her eyes and her mood changes to shock; cut to under the tree where Phineas and Ferb are suddenly there. As (Y/N) stood near them.

"Hi, Mom." Phineas smiled.

"Hello Ms. Fletcher." (Y/N) waved back.

Linda pats a shocked Candace shoulder, "Come on, Candace. Help me with the groceries." She goes off.

"But, but, but, but, but, but, but..." Candace continues under.

Linda comes back, "Let's go." She pulls her away.

Teens come down from the tree.

"Hey Phineas, that was great."

"Way too cool."

"That was awesome! Can we do it again?"

Scene cuts to show the coaster burning on top of the tree.

Phineas smiled, "Sorry, only one ride per customer."

Isabella is shown coming down from the tree, "That was great, Phineas. So, what are you gonna do tomorrow?"

Phineas shrugs, "Don't know yet."

Isabella pets Perry, "Maybe you can teach Perry some tricks."

Phineas sighs, "Well, he is a platypus, they don't do much."

"They're the only mammals to lay eggs." Ferb states.

"Is that true?" (Y/N) asked, "Smart." Ferb's cheeks tint pink slightly as she smiles.

A pause.

Phineas smiles, "...Maybe he'll lay an egg."

"Cool. See you tomorrow." Isabella goes to the gate, "It really was the coolest coaster ever. You guys make a great team."

"Well, a brother is a brother, but I couldn't have asked for a better one than Ferb. You know what I mean?" Ferb burps, "Oh-ho-ho, man! I could smell the peanut butter!"

"Well, that was impressive. See you, guys." Isabella leaves.

"Tell Candace I'll see her tomorrow...Thanks guys, that was so much fun!" (Y/N) smiled happily, "You guys are so cool!" She then walks off.

Ferb just waved silently as Phineas nudged Ferb, a chuckle leaving his lips. The two walk away from the tree a bit, just in case as Phineas turned to the tree and smiled, arms crossed.

"So, what should we do tomorrow?" Phineas asked his brother, "There's a world of possibilities. Maybe we should make a list!"

The coaster car explodes in the tree, a car alarm and a dog barking can be heard.

Candace yells from inside, "Mom!!"

Linda yells from inside, "Give it a rest, Candace!"

The tinfoil ball rolls in the background.