Why, hello again! How is everyone? I apologize for not updating yesterday, but I was busy most of the day, soooo I'm posting a longer chapter today! Actually the chapter just turned out longer than I expected... :P Anyway, I had this idea earlier today and I thought it'd be a great plot twist, so please tell me what you think! Enjoy and thanks again for all the reviews! :D

Disclaimer: Last I checked, I didn't own Phineas and Ferb ^^;

While Phineas was talking to Candace, the Fireside Girls were deep in training to earn their desired patch. As they proceeded down the dark hall, they came across several enemies whom they had to take down.

First they encountered an already terrified Baljeet, who fought only by flapping his arms about. Gretchen kicked him in the shin at which point he begged for mercy, much to Ginger's digress. Next they came across… Perry? Or at least Isabella confirmed from a sign that said "Ninja Perry" that their opponent was supposed to be Perry. However, the platypus didn't make an appearance, so the girls went on their way.

Finally, they came to Buford, who seemed thoroughly annoyed for "having to wait so long." The bulky boy threw a punch, but the Fireside Girls scattered at Isabella's command. Buford chose a target and attacked once more, but received a neat kick in the stomach from Milly. By this point, Isabella had had enough, so she called out a rally of orders. Ginger, Milly, Gretchen, and Holly each took a side and struck, but Buford was ready, or so he thought. He twisted to dodge, only to find himself face to face with Isabella and Adyson, who pinned him in a matter of seconds.

"Fine, I give up!" Buford shouted, half defiantly. "I was the last challenge, so follow the tunnel to where you'll find the master." He tried to point in the direction that he meant, but found his arms were still trapped and resorted to jerking his chin.

"Thank you!" Isabella said sweetly before giving the order to release.

The Fireside Girls walked for a long time and Isabella wondered how long Phineas and Ferb had actually made the tunnel.

At last, they saw a gleam of light and they entered into a sort of training room. The room itself wasn't terribly big, but the floor was padded and one corner held a couple punching bags. To complete the picture, a lone figure stood in the center of the room: Phineas.

Phew, I made it back in time, Phineas thought. Though I still wish I could've asked Candace a few more questions. "Ladies and, well, I guess just ladies… Welcome to the great Underground Dojo! You have passed all the tests and now you are ready to train with the master!" He waved his hand and smoke began to surround him.

When the smoke cleared, Ferb stood in his brother's place in full ninja uniform.

The sun was starting to set when the kids exited their underground world, at which point Candace raced up to them, muttering something about busting. Unfortunately for Candace, a giant safety pin got caught in the shack and carried it away, closing the entrance to the studio. Mrs. Flynn entered the backyard, her daughter groaned loudly, and they both vanished into the house.

Phineas shrugged before calling everyone to attention. "We have some patches to give out today," he announced cheerily. "For taking on and defeating several opponents and mastering boxing, Kung Fu, Tae Kwon Do, and Jujitsu, I present each of the Fireside Girls with their Martial Arts Patch!" At that point, he went around and handed a patch to each girl.

When he got to Isabella, he gave her the patch and took her hand, this time without regret. "Hey, Isabella," he started, "d-do you want to do something with me tomorrow?" Maybe he wasn't regretting, but he still had a mountain of butterflies in his stomach.

Isabella smiled a little as she drew her hand away and said softly, "Sorry, Phineas, but no thanks." Ferb, Baljeet, Buford, and every other Fireside Girl's mouth dropped open as Isabella turned and made her way home.

Phineas dropped to his knees, a look of pure shock and hurt on his face. He was only ten, but even ten-year-olds can get stabbed in the heart.

The crowd left reluctantly, leaving the brothers alone. Ferb sat next to Phineas under their tree. The young redhead had brought his knees to his chest, his eyes still wide as if he had no idea what had happened.

"What went wrong, Ferb?" Phineas asked dejectedly.

Ferb closed his eyes for a moment and shook his head slightly. "I don't know, but something isn't right here." When Phineas gave him a questioning look, he added, "That's not something the normal Isabella would do."

The Fireside Girls walked part of the way home together, only to branch off as they came to their respective streets and houses. When they were the last two left, Isabella stopped and faced Adyson.

"I can't do that again!" Isabella almost shouted, tears welling up in her eyes.

Adyson crossed her arms, looking skeptical. "He's never going to like you if you just moon over him every time he talks to you. You have to play hard-to-get or he'll just take advantage of you."

A tear rolled down the Fireside Girl leader's cheek. "How do you know that? Phineas wouldn't do that; we're just KIDS, for crying our loud! Besides, didn't you see his face?"

"I did see his face and, tell me, did he ever shown that much emotion towards you when you were falling all over him?" Adyson challenged.

Isabella hesitated before shaking her head. "I guess not…" she whimpered. "But he looked so sad!"

"Look, Izzy, I'm sorry." Adyson's voice and posture softened. "I wouldn't insist on you doing this unless I really thought it would help. You turned him down once, but that means that, if he really likes you, he'll try again."

The black-haired girl nodded. "I guess that makes sense. But seriously," she added, "we sound like you're in some teenage drama! How old do we think we are?"

"Ten," Adyson said, grinning.