This is a prompt challenge in which I'll tackle 100 different prompts; as an added challenge to myself, I will be doing each prompt in exactly 100 words. Prompts will be in linear order and will have 10 posted per chapter. Will mostly follow the progression of Phineas and Isabella through the years. Enjoy!

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Introduction

Sunnyside was the top-rated pre-school in the district. The teachers were wonderful, the playground was state-of-the-art, and they had a beautiful butterfly garden. This school was perfect.

Which is why Vivian Garcia-Shapiro couldn't understand why her daughter hated it. Isabella, barely 5-years-old, stated she lacked friends. Vivan had worried that she'd enrolled Isabella too soon, until one day she came to pick her up and saw her holding the hand of a small boy.

"Mama!" Isabella greeted, "Meet my new friend Phineas!"

So started her daughters first step of falling in love.

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Complicated

"Phineas, you're suppose' to color the truck red. Not yellow." Isabella pointed her crayon to her friends incorrect picture. Phineas only smiled at her in return.

"I know, but I like yellow better."

"It's wrong, though." She frowned, but he only laughed. Isabella grumbled under her breath and shot her hand upwards.

"Teacher!" She exclaimed, "Phineas is coloring wrong!"

A boy leaned over to Phineas, whispering, "I thought you guys were friends?"

Phineas laughed again and grinned, "Well...it's complicated."

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Making History

Isabella was helping a girl collect pebbles when Phineas came rushing up to them, all grins.

"Hey Isabella! Look what I found!"

He didn't wait for her reply, instead dragging her along with him to the butterfly garden. Among the flowers was a white brick, half buried in the dirt.

"Cool." Isabella eyed him as Phineas dug it out, presenting it to her proudly.

"Let's write our names on it so everyone knows we were the first to find it!"

For years later students wondered who Phineas and Isabella were.

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Rivalry

"Paint. P-A-I-N-T. Paint."

"Very good, Isabella!" The teacher praised the young girl as she puffed up with pride. She turned to Phineas next.

"Phineas, spell "orange"."

"Orange." He smiled; he always smiled, "O-R-A-N-G-E. Orange."

"Great job Phineas! You've gotten them all right!" The teacher was beaming at him, but Isabella couldn't help glaring.

That week she did nothing but study her vocabulary words, refusing to speak to Phineas again until they faced off in the following spelling bee; and she won.

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Unbreakable

It was show-and-tell day, and Phineas brought his favorite baseball to class. It was signed by some baseball player, and Isabella liked it, but felt her well-dressed china-doll was much better.

When it was her turn to go, she got overly-excited and tripped, dropping the doll in the process and breaking its arm off. She hid in the bathroom and cried until her mother picked her up.

The next day Phineas greeted her with more enthusiasm as as usual, and handed her a doll covered in rubber-bands.

"It'll never break!" He explained; and it never did.

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Obsession

The school year had just begun for fourth graders, but Isabella was having none of it. She sat in her closet and refused to come out, no matter what her mother said.

"I can't go Mama!" She insisted from behind the closed door, "Phineas won't be there! He's going to Pineview!"

Vivian fought on the subject; surely her daughter could make new friends! By the third week, however, she gave up and transferred the girl to Pineview.

That probably should have been her first sign of what was to come.

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Eternity

Phineas was smart; but he was also very, very stupid.

Isabella pouted at her desk as she sat, cheeks resting on her hands, in detention next to the notorious Flynn-Fletcher.

"This is your fault." She grumbled, and he shot her a pitiful look.

"Sorry..."

Isabella sighed and looked back up at the clock. It was ticking by even slower than usual. She glanced to the massive water leak still being mopped in the hall way.

She decided she'd never help with one of Phineas's project again; not even for an indoor pool.

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Gateway

It wasn't often that having a friend move was a good thing. For most kids, it meant saying goodbye; for Isabella, it meant having Phineas right across the street.

With a quick bye to her mother, Isabella skipped her way across the street and stared up at the large moving truck in the driveway. She heard a familiar voice coming from the backyard, and made her way through the gateway of the fence.

"Hey Phineas!" She chirped, "Whatcha doin'?"

"Oh, hi Isabella!" Phineas greeted happily.

Thus a tradition was born.

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Death

Normally Phineas was always smiling; today, however, he only sat and stared sadly down at the dirt.

"Hey Phineas." Isabella entered the backyard cautiously, unsure what had happened, "...whatcha doin?"

"Hey Isabella." He didn't lift his eyes to greet her, "Just missing Bucky, that's all."

"Why? What happened?"

"He got sick and had to go live on kindly old man Simmon's farm..."

"Oh..."

She sat next to Phineas and Ferb for the rest of the day. Isabella held his hand.

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Opportunities

Isabella had never had so much fun on a roller-coaster. Phineas had told her that to start off this summer he was going to build something similarly amazing everyday; she had at first been skeptical, but there was no denying now that him and his brother were certainly capable of doing it.

She knew she'd probably get in trouble for it eventually, but Isabella couldn't help offering help to the brothers as the projects grew more and more intricate. It provided more reason for her to come over every day.

Any trouble was definitely worth it.